学习GlusterFS（七）

阅读原文时间：2023年07月08日阅读：2

初始环境：

系统环境:centos73.10.0-514.26.2.el7.x86_64

机器数量：两台

硬盘：至少两块,一块为系统盘，另一块留作他用

命名规则：node1 node2

IP规划：192.168.238.129 node1

192.168.238.130 node2

1.磁盘设置（装完系统后，格式化另外的硬盘，两节点都需要）

[root@node1 ~]#fdisk /dev/sdb#格式化磁盘

2.设置磁盘格式挂载硬盘

(on both nodes):Note:

These examples are going to assume the brick is going to reside on /dev/sdb1.(两节点都需要做)

[root@node1 ~]#mkfs.xfs -i size=512/dev/sdb1

[root@node1 ~]#mkdir -p /export/sdb1&& mount /dev/sdb1 /export/sdb1#建立挂载目录和挂载

[root@node1 ~]#echo"/dev/sdb1 /export/sdb1 xfs defaults 0 0">> /etc/fstab#加入开机启动

[root@node1

~]#mount -a && mount#挂载测试和挂载及结果查看

3.安装glusterfs

[root@node1 ~]#yum installcentos-release-gluster#安装源

[root@node1 ~]#yuminstall glusterfs-server#安装glusterfs

4.注意关掉防火墙

[root@node1 ~]#systemctlstop firewalld#临时关闭，重启还会启动

[root@node1 ~]#systemctldisable firewalld#永久关闭

5.启动glusterfs

[root@node1 ~]#systemctl start glusterd#启动gluster

[root@node1 ~]#systemctl enable glusterd#加入开机启动

6.组建集群

Replace nodename with hostname of theother server in the cluster, or IP address if you don’t have DNS or /etc/hostsentries

在/etc/hosts里边做设置或者在DNS，建议两者都做，这里没有DNS解析服务器，只在/etc/hosts里边坐绑定，注意不要忘记该机器的名字。

For Example：

[root@node1 gluster]#cat /etc/hosts

127.0.0.1localhostlocalhost.localdomain localhost4 localhost4.localdomain4

::1localhostlocalhost.localdomain localhost6 localhost6.localdomain6

192.168.238.129 node1

192.168.238.130 node2

192.168.238.133 node3

192.168.238.132 node4

192.168.238.134 node5

#在node1节点运行peer probe命令

[root@node1 ~]#glusterpeer probe node2#注意，如果探测不到请确认host解析做了没有，防火墙是否关闭

#查看刚刚加入的节点

[root@node1 ~]#glusterpeer status

[root@node1 ~]#gluster peer probe node2

peer probe: success.

[root@node1 ~]#gluster peer status

Number of Peers: 1

Configure your Gluster volume

删除加入的节点（如果想删除节点，执行该命令）

[root@node1 ~]#glusterpeer detach node2

在俩个主机执行

[root@node1 ~]#mkdir -p/export/sdb1/brick

[root@node1~]#gluster volume create testvol replica 2 transport tcpnode1:/export/sdb1/brick node2:/export/sdb1/brick

volume create: testvol: success: please start the volume to accessdata

[root@node1 log]#gluster peer status

Number of Peers: 1

Hostname: node2

Uuid: 61fe987a-99ff-419d-8018-90603ea16fe7

State: Peer in Cluster (Connected)

[root@node1 log]#glustervolume info

Volume Name: testvol

Type: Replicate

Volume ID: bc637d83-0273-4373-9d00-d794a3a3d2e7

Status: Started

Snapshot Count: 0

Number of Bricks: 1 x 2 =2

Transport-type: tcp

Bricks:

Brick1: node1:/export/sdb1/brick

Brick2: node2:/export/sdb1/brick

Options Reconfigured:

transport.address-family: inet

nfs.disable: on

[root@node1 ~]#gluster volume start testvol#启动volume

volume start: testvol: success

[root@node1 gluster]#gluster volume info#查看Volume信息

Volume Name: testvol

Type: Replicate

Volume ID: bc637d83-0273-4373-9d00-d794a3a3d2e7

Status: Started

Snapshot Count: 0

Number of Bricks: 1 x 2 = 2

Transport-type: tcp

Bricks:

Brick1: node1:/export/sdb1/bricks

Brick2: node2:/export/sdb1/brick

Options Reconfigured:

transport.address-family: inet

nfs.disable: on

[root@node2 ~]#gluster volume status

Status of volume: testvol

Gluster processTCP PortRDMA PortOnlinePid

------------------------------------------------------------------------------

Brick node1:/export/sdb1/brick491520Y10774

Brick node2:/export/sdb1/brickN/AN/ANN/A

Self-heal Daemon on localhostN/AN/AY998

Self-heal Daemon on node1N/AN/AY10794

Task Status of Volume testvol

------------------------------------------------------------------------------

There are no active volume tasks

注意点：上边的环境为每个服务器单块硬盘的结构，如果是多块硬盘的结构，应该为分别格式化，挂载，具体过程如下：

mkfs.xfs -i size=512 /dev/sdc1

mkdir /export/sdb1

mount /dev/sdc1 /export/sdc1

echo "/dev/sdc1 /export/sdc1 xfs defaults0 0">> /etc/fstab

mkdir -p /export/sdb1/brick#所有的节点执行

node1上执行：

每台主机一块硬盘执行的命令（上边我们配置的模式）：

# gluster volume create testvol replica 2transport tcp node1:/export/sdb1/brick node2:/export/sdb1/brick

每台主机两块硬盘执行的命令：

# gluster volume create testvol replica 2transport tcp node1:/export/sdb1/brick node2:/export/sdb1/bricknode1:/export/sdc1/bricknode2:/export/sdc1/brick

照理推即。

挂载测试

[root@node1 ~]# mkdir/mnt/gluster/

[root@node1 ~]#mount -tglusterfs node1:/testvol /mnt/gluster/

Expanding

Volumes(扩容)

To expand a volume

前提条件开始有node1和node2节点，后加node3和node4节点的配置同上，必须一次加一对主机，注意修改集群里各个主机的/etc/hosts文件，新加入node节点

1）On the first server in the cluster,probe the server to which you want to add the new brick using the followingcommand:

# gluster peerprobe#执行的命令如下：

[root@node1 ~]#gluster peer probe node3

peer probe: success.

[root@node1 ~]#gluster peer probe node4

peer probe: success.

2）Add the brick using the followingcommand:

# gluster volumeadd-brick

[root@node1 ~]#gluster volume add-bricktestvol node3:/export/sdb1/brick node4:/export/sdb1/brick

volume add-brick:success#显示成功

3）Check the volume information using the following command:（检查命令如下）

[root@node1 ~]#gluster volume info

Volume Name: testvol

Type: Distributed-Replicate

Volume ID:09363405-1c7c-4eb1-b815-b97822c1f274

Status: Started

Snapshot Count: 0

Number of Bricks: 2 x2 = 4

Transport-type: tcp

Bricks:

Brick1:node1:/export/sdb1/brick

Brick2:node2:/export/sdb1/brick

Brick3:node3:/export/sdb1/brick

Brick4:node4:/export/sdb1/brick

Options Reconfigured:

transport.address-family:inet

nfs.disable: on

Rebalance the volumeto ensure that all files are distributed to the new brick.

You can use therebalance command as described in Rebalancing Volumes

[root@node1 ~]#gluster volume rebalancetestvol start

volume rebalance:testvol: success: Rebalance on testvol has been started successfully. Userebalance status command to check status of the rebalance process.

ID: c9d052e8-2b6c-40b0-8d77-52290bcdb61

To shrink a volume（在线收缩）

本例的操作

[root@node1 gluster]#gluster volume remove-bricktestvol node3:/export/sdb1/brick node4:/export/sdb1/brick force

Removing brick(s) can result in data loss. Do you want to Continue? (y/n)y

volume remove-brick commit force: success

详见后边的文档

1.Remove the brick using the following command:

# gluster volume remove-brickstart

For example, to remove server2:/exp2:

# gluster volume remove-brick test-volume server2:/exp2 force

Removingbrick(s) canresultindata loss.Doyou want toContinue? (y/n)

2.Enter "y" to confirm the operation. The commanddisplays the following message indicating that the remove brick operation issuccessfully started:

3.RemoveBrick successful

4.(Optional) View the status of the remove brick operation usingthe following command:

# gluster volume remove-brickstatus

For example, to view the status of removebrick operation on server2:/exp2 brick:

#__gluster__volume__remove-_brick__test_-_volume__server2:/exp2__status_

Node__Rebalanced-_files__size__scanned__status_

-----------------------------------------------

617c923e-_6450_-_4065_-_8e33_-_865e28d9428f__34__340__162__in__progress_

5.Check the volume information using the following command:

# gluster volume info

The command displays information similar tothe following:

# gluster volume info

VolumeName:test-volume

Type:Distribute

Status:Started

Number ofBricks:3

Bricks:

Brick1:server1:/exp1

Brick3:server3:/exp3

Brick4:server4:/exp4

6.Rebalance the volume to ensure that all files are distributed tothe new brick.

You can use the rebalance command as described inRebalancing Volumes

主机上硬盘故障的处理方式

方法一：如果本机还有空闲的备用盘的处理方式

故障问题：

[root@node2 ~]#gluster volume status

Status of volume:testvol

Gluster processTCP PortRDMA PortOnlinePid

------------------------------------------------------------------------------

Bricknode1:/export/sdb1/brick491520Y2684

Brick node2:/export/sdb1/brickN/AN/ANN/A#sdb1显示不在线，故障

Bricknode1:/export/sdc1/brick491530Y2703

Bricknode2:/export/sdc1/brick491530Y2704

Bricknode3:/export/sdb1/brick491520Y2197

Bricknode4:/export/sdb1/brick491520Y2207

Bricknode3:/export/sdc1/brick491530Y2216

Bricknode4:/export/sdc1/brick491530Y2226

Self-heal Daemon onlocalhostN/AN/AY1393

Self-heal Daemon onnode1N/AN/AY3090

Self-heal Daemon onnode4N/AN/AY2246

Self-heal Daemon onnode3N/AN/AY2236

Task Status of Volumetestvol

------------------------------------------------------------------------------

Task: Rebalance

ID:8b3a04a0-0449-4424-a458-29f602571ea2

Status: completed

从上方看到Brick node2:/export/sdb1/brick不在线，出现了问题

解决：

1.创建新的数据目录，将备用的硬盘格式化，挂载到系统中去（故障主机上执行）

[root@node2 ~]#mkfs.xfs -i size=512/dev/sdd1#格式化

[root@node2 ~]#mkdir /export/sdd1/brick-p#建立相关的目录

[root@node2 ~]#mount /dev/sdd1 /export/sdd1#挂载

[root@node2 ~]#echo "/dev/sdd1 /export/sdd1 xfs defaults 00">> /etc/fstab#加入开机启动

2.查询故障点的目录的扩展属性（正常主机执行）

[root@node1 brick]#getfattr -d -m. -e hex /export/sdb1/brick/

getfattr: Removingleading '/' from absolute path names

# file:export/sdb1/brick/

security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000

trusted.afr.dirty=0x000000000000000000000000

trusted.afr.testvol-client-1=0x000000000000000000000000

trusted.gfid=0x00000000000000000000000000000001

trusted.glusterfs.dht=0x0000000100000000000000003ffffffe

trusted.glusterfs.dht.commithash=0x3000

trusted.glusterfs.volume-id=0xe107222fa1134606a9a7fcb16e4c0709

3.挂载卷并触发自愈（故障主机执行）

[root@node2 ~]#mount -t glusterfs node2:/testvol /mnt#挂载点随便，不重复就可以，node2:/testvol为之前生成的卷

[root@node2 ~]#mkdir /mnt/test#新建一个卷中不存在的目录并删除，根据你的挂载点的位置变换执行

[root@node2 ~]#rmdir /mnt/test#删除刚才新建立的目录

[root@node2 ~]#setfattr -n trusted.non-existent-key -v abc /mnt#设置扩展属性触发自愈

[root@node2 ~]#setfattr-x trusted.non-existent-key /mnt#设置扩展属性触发自愈

4.检查当前节点是否挂起

正常的主机执行

[root@node1 gluster]#getfattr -d -m. -e hex /export/sdb1/brick/#

/export/sdb1/brick/你建立brick的位置

getfattr: Removing leading '/' from absolute path names

# file: export/sdb1/brick/

security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000

trusted.afr.dirty=0x000000000000000000000000

trusted.afr.testvol-client-1=0x000000000000000400000004<<---- xattrs are marked

from source brick node1:/export/sdb1/brick--->>

trusted.gfid=0x00000000000000000000000000000001

trusted.glusterfs.dht=0x0000000100000000000000003ffffffe

trusted.glusterfs.dht.commithash=0x3334343336363233303800

trusted.glusterfs.volume-id=0xe107222fa1134606a9a7fcb16e4c0709

故障主机执行（正常也可以）：

[root@node2 gluster]#gluster volume heal testvol info#查看你testvol的信息

Brick node1:/export/sdb1/brick

Status: Connected

Number of entries: 1

Brick node2:/export/sdb1/brick

Status: Transport endpoint is not connected

Number of entries: -#状态显示传输端点未连接

Brick node1:/export/sdc1/brick

Status: Connected

Number of entries: 0

Brick node2:/export/sdc1/brick

Status: Connected

Number of entries: 0

Brick node3:/export/sdb1/brick

Status: Connected

Number of entries: 0

Brick node4:/export/sdb1/brick

Status: Connected

Number of entries: 0

Brick node3:/export/sdc1/brick

Status: Connected

Number of entries: 0

Brick node4:/export/sdc1/brick

Status: Connected

Number of entries: 0

5.使用强制提交完成修复操作

故障机执行

[root@node2 ~]#gluster volume replace-brick testvol node2:/export/sdb1/bricknode2:/export/sdd1/brick commit force

volume replace-brick: success: replace-brick commit force operationsuccessful#提示成功

[root@node2 ~]#gluster volume status

Status of volume: testvol

Gluster processTCP PortRDMA PortOnlinePid

------------------------------------------------------------------------------

Brick node1:/export/sdb1/brick491520Y2684

Brick node2:/export/sdd1/brick491540Y10298#在线盘已经是sdd1，已经吧sdb1替换了

Brick node1:/export/sdc1/brick491530Y2703

Brick node2:/export/sdc1/brick491530Y2704

Brick node3:/export/sdb1/brick491520Y2197

Brick node4:/export/sdb1/brick491520Y2207

Brick node3:/export/sdc1/brick491530Y2216

Brick node4:/export/sdc1/brick491530Y2226

Self-heal Daemon on localhostN/AN/AY10307

Self-heal Daemon on node3N/AN/AY9728

Self-heal Daemon on node1N/AN/AY3284

Self-heal Daemon on node4N/AN/AY9736

Task Status of Volume testvol

------------------------------------------------------------------------------

Task:Rebalance

ID:8b3a04a0-0449-4424-a458-29f602571ea2

Status: notstarted

正常主机执行

[root@node1 gluster]#getfattr -d -m. -e hex /export/sdb1/brick/

getfattr: Removing leading '/' from absolute path names

# file: export/sdb1/brick/

security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000

trusted.afr.dirty=0x000000000000000000000000

trusted.afr.testvol-client-1=0x000000000000000000000000<<---- Pending changelogs are cleared.

trusted.gfid=0x00000000000000000000000000000001

trusted.glusterfs.dht=0x0000000100000000000000003ffffffe

trusted.glusterfs.dht.commithash=0x3334343336363233303800

trusted.glusterfs.volume-id=0xe107222fa1134606a9a7fcb16e4c0709

[root@node2 ~]#gluster volume heal testvol info

Brick node1:/export/sdb1/brick

Status: Connected

Number of entries: 0

Brick node2:/export/sdd1/brick

Status: Connected

Number of entries: 0

Brick node1:/export/sdc1/brick

Status: Connected

Number of entries: 0

Brick node2:/export/sdc1/brick

Status: Connected

Number of entries: 0

Brick node3:/export/sdb1/brick

Status: Connected

Number of entries: 0

Brick node4:/export/sdb1/brick

Status: Connected

Number of entries: 0

Brick node3:/export/sdc1/brick

Status: Connected

Number of entries: 0

Brick node4:/export/sdc1/brick

Status: Connected

Number of entries: 0

也可以使用（上边的为官方文档的修复过程，用下边的也可以搞定）：

当某块磁盘损坏后，需要换一块新的磁盘回去，这时集群中恰好还预留了备用磁盘，因此用备用磁盘替换损坏的磁盘，命令如下两条命令这个就可以搞定

挂载磁盘参考上边（挂载点/export/sdd1）

[root@node2 ~]#gluster volume replace-brick voltest node2:/export/sdb1/bricknode2:/export/sdd1/brickcommit（前边为故障盘，后边为恢复盘）

方式二：跨主机的同步

假设node2的sdb1有问题

前提：加入新主机node5（两块硬盘，一块系统盘，一块挂在盘），node5磁盘格式化，挂载和gluster的安装过程等准备工作同上，注意修改集群里各个主机的/etc/hosts文件，新加入node节点：

将node5加入信任池

[root@node1 brick]#gluster peer probe node5

peer probe: success.

挂载磁盘

[root@node5 ~]#mkdir -p /export/sdb1 && mount /dev/sdb1 /export/sdb1

[root@node5 ~]#echo "/dev/sdb1 /export/sdb1 xfs defaults 0 0">> /etc/fstab

[root@node5 ~]#mount -a && mount

执行下边的命令：

[root@node5 ~]#gluster volume replace-brick testvol node2:/export/sdb1/bricknode5:/export/sdb1/brickcommit force

volume replace-brick: success: replace-brick commit force operationsuccessful

替换后可以继续使用，也可以在sdb1硬盘更换后后，数据倒回，命令如下

[root@node2 ~]#gluster volume replace-brick testvol node5:/export/sdb1/bricknode2:/export/sdb1/brick commit force

volume replace-brick: success: replace-brick commit force operationsuccessful

替换之前的状态：

[root@node1 brick]# gluster volume status

Status of volume: testvol

Gluster processTCP PortRDMA PortOnlinePid

------------------------------------------------------------------------------

Brick node1:/export/sdb1/brick491520Y2085

Brick

node5:/export/sdb1/brick491520Y18229

Brick node1:/export/sdc1/brick491530Y2076

Brick node2:/export/sdc1/brick491530Y2131

Brick node3:/export/sdb1/brick491520Y2197

Brick node4:/export/sdb1/brick491520Y2207

Brick node3:/export/sdc1/brick491530Y2216

Brick node4:/export/sdc1/brick491530Y2226

Self-heal Daemon on localhostN/AN/AY10565

Self-heal Daemon on node2N/AN/AY2265

Self-heal Daemon on node3N/AN/AY10416

Self-heal Daemon on node4N/AN/AY10400

Self-heal Daemon on node5N/AN/AY18238

Task Status of Volume testvol

------------------------------------------------------------------------------

Task:Rebalance

ID:8b3a04a0-0449-4424-a458-29f602571ea2

Status: notstarted

替换之后的状态：

[root@node1 gluster]# gluster volume status

Status of volume: testvol

Gluster processTCP PortRDMA PortOnlinePid

------------------------------------------------------------------------------

Brick node1:/export/sdb1/brick491520Y2085

Brick

node2:/export/sdb1/brick（过来了）491530Y10208

Brick node1:/export/sdc1/brick491530Y2076

Brick node2:/export/sdc1/brick491520Y3474

Brick node3:/export/sdb1/brick491520Y2197

Brick node4:/export/sdb1/brick491520Y2207

Brick node3:/export/sdc1/brick491530Y2216

Brick node4:/export/sdc1/brick491530Y2226

Self-heal Daemon on localhostN/AN/AY10684

Self-heal Daemon on node3N/AN/AY10498

Self-heal Daemon on node5N/AN/AY10075

Self-heal Daemon on node4N/AN/AY10488

Self-heal Daemon on node2N/AN/AY10201

Task Status of Volume testvol

------------------------------------------------------------------------------

Task:Rebalance

ID:8b3a04a0-0449-4424-a458-29f602571ea2

Status: notstarted

数据的平衡

一般平衡数据有如下两种场景：

Fix Layout：重新定位layout，原来的layout不变，（新）数据写入新的节点

Fix Layout and Migrate Data:重新定位layout的修改，并且迁移已经存在的数据

要注意的是当有新的节点加入的时候，必须做fix layout，不然新写入的数据还是写入到老的节点上去

1.To rebalance a volume to fix layout changes（fix

layout）

Start the rebalance operation on any one ofthe server using the following command:

# gluster volume rebalance fix-layout start

For example:

# gluster volume rebalance test-volumefix-layout start

Starting rebalance on volume test-volumehas been successful

本机的命令如下：

[root@node1

gluster]#gluster volume rebalance testvolfix-layout start

volume rebalance: testvol: success:Rebalance on testvol has been started successfully. Use rebalance statuscommand to check status of the rebalance process.

ID: 0ea5aa16-b349-44ca-a51b-d5fcf47e1272

[root@node1

gluster]#gluster volume rebalance testvol status

Nodestatusrun time in hⓂ️s

--------------------------------

localhostfix-layout completed0:0:0

node2fix-layout completed0:0:0

node3fix-layout completed0:0:0

node4fix-layout completed0:0:0

volume rebalance: testvol: success

2.To rebalance a volume to fix

layout and migrate the existing data（Fix Layout

and Migrate Data）

Start the rebalance operation on any one ofthe server using the following command:

# gluster volume rebalance start

For example:

# gluster volume rebalance test-volumestart

Starting rebalancing on volume test-volumehas been successful

Start the migration operation forcefully onany one of the servers using the following command:

# gluster volume rebalance start force

For example:

# gluster volume rebalance test-volumestart force

Starting rebalancing on volume test-volumehas been successful

本机操作命令：

[root@node1

gluster]#gluster volume rebalance testvol start

volume rebalance: testvol: success:Rebalance on testvol has been started successfully. Use rebalance statuscommand to check status of the rebalance process.

ID: 2a47d454-fdc3-4d95-81ac-6981577d26e9

[root@node1

gluster]#gluster volume rebalance testvol status

NodeRebalanced-filessizescannedfailuresskippedstatusrun time in hⓂ️s

------------------------------------------------------------------------------------------

localhost00Bytes3701completed0:00:00

node200Bytes000completed0:00:00

node300Bytes2700completed0:00:00

node400Bytes000completed0:00:00

volume rebalance: testvol: success

2.Stopping Rebalance Operation（需要的话）

You can stop the rebalance operation, asneeded.

Stop the rebalance operation using the followingcommand:

# gluster volume rebalancestop

For example:

# gluster volume rebalance test-volume stop

NodeRebalanced-filessizescannedstatus

-----------------------------------------------

617c923e-6450-4065-8e33-865e28d9428f59590244stopped

Stopped rebalance process on volumetest-volume

Stopping

Volumes

Stop the volume using the followingcommand:

# gluster volume stop

For example, to stop test-volume:

# gluster volume stop test-volume

Stopping volume will make its datainaccessible. Do you want to continue? (y/n)

Enter y to confirm the operation. Theoutput of the command displays the following:

Stopping volume test-volume has been successful

Deleting

Volumes

Delete the volume using the followingcommand:

# gluster volume delete

For example, to delete test-volume:

# gluster volume delete test-volume

Deleting volume will erase all informationabout the volume. Do you want to continue? (y/n)

Enter y to confirm the operation. Thecommand displays the following:

Deleting volume test-volume has beensuccessful

Triggering Self-Heal on Replicate

In replicate module, previously you had tomanually trigger a self-heal when a brick goes offline and comes back online,to bring all the replicas in sync. Now the pro-active self-heal daemon runs inthe background, diagnoses issues and automatically initiates self-healing every10 minutes on the files which requires_healing_.

You can view the list of files that need_healing_,the list of files which are currently/previously_healed_,list of files which are in split-brain state, and you can manually triggerself-heal on the entire volume or only on the files which need_healing_.

·Trigger self-heal only on the files which requires_healing_:

# gluster volume heal

For example, to trigger self-heal on fileswhich requires_healing_of test-volume:

# gluster volume heal test-volume

Heal operation onvolumetest-volumehas been successful

·Trigger self-heal on all the files of a volume:

# gluster volume heal full

For example, to trigger self-heal on all thefiles of of test-volume:

# gluster volume heal test-volume full

Heal operation onvolumetest-volumehas been successful

·View the list of files that needs_healing_:

# gluster volume heal info

For example, to view the list of files ontest-volume that needs_healing_:

# gluster volume heal test-volume info

Brick server1:/gfs/test-volume_0

Numberofentries:0

Brick server2:/gfs/test-volume_1

Numberofentries:101

/95.txt

/32.txt

/66.txt

/35.txt

/18.txt

/26.txt

/47.txt

/55.txt

/85.txt

…

·View the list of files that are self-healed:

# gluster volume heal info

healed

For example, to view the list of files ontest-volume that are self-healed:

# gluster volume heal test-volume info healed

BrickServer1:/gfs/test-volume_0

Numberofentries:0

BrickServer2:/gfs/test-volume_1

Numberofentries:69

/99.txt

/93.txt

/76.txt

/11.txt

/27.txt

/64.txt

/80.txt

/19.txt

/41.txt

/29.txt

/37.txt

/46.txt

…

·View the list of files of a particular volume on which theself-heal failed:

# gluster volume heal info

failed

For example, to view the list of files oftest-volume that are not self-healed:

# gluster volume heal test-volume info failed

BrickServer1:/gfs/test-volume_0

Numberofentries:0

BrickServer2:/gfs/test-volume_3

Numberofentries:72

/90.txt

/95.txt

/77.txt

/71.txt

/87.txt

/24.txt

…

·View the list of files of a particular volume which are insplit-brain state:

# gluster volume heal info split-brain

For example, to view the list of files oftest-volume which are in split-brain state:

# gluster volume heal test-volume info split-brain

BrickServer1:/gfs/test-volume_2

Numberofentries:12

/83.txt

/28.txt

/69.txt

…

BrickServer2:/gfs/test-volume_3

Numberofentries:12

/83.txt

/28.txt

/69.txt

…

问题处理：

1.提示State: Peer in Cluster (Disconnected)

[root@node1 gluster]# gluster peer status

Number of Peers: 1

Hostname: node2

Uuid: 61fe987a-99ff-419d-8018-90603ea16fe7

State: Peer in Cluster(Disconnected)

解决方式：查看防火墙状态和/etc/hosts文件，防火墙也可以通过规则放行，不过还是关掉好，性能考虑

2.重建volume出错

[root@node1

sdb1]#gluster volume start testvol

volume start: testvol: failed: Failed toget extended attribute trusted.glusterfs.volume-id for brick dir /export/sdb1/brick.Reason : No data available#故障重建volume出错

处理方式：查看volume的信息，删除掉volume，清空信息，重新建立volume

[root@node1

sdb1]#gluster volume info

Volume Name: testvol

Type: Replicate

Volume ID:57a60503-c5ae-4671-b213-6f2a2f913615

Status: Created

Snapshot Count: 0

Number of Bricks: 1 x 2 = 2

Transport-type: tcp

Bricks:

Brick1: node1:/export/sdb1/brick

Brick2: node2:/export/sdb1/brick

Options Reconfigured:

transport.address-family: inet

nfs.disable: on

[root@node1

sdb1]#gluster volume delete testvol

Deleting volume will erase all informationabout the volume. Do you want to continue? (y/n) y

volume delete: testvol: success

[root@node1

sdb1]#setfattr -x trusted.glusterfs.volume-id/export/sdb1/brick && setfattr -x trusted.gfid /export/sdb1/brick&& rm -rf /export/sdb1/brick/..glusterfs

setfattr: /export/sdb1/brick: No suchattribute

[root@node1

sdb1]#setfattr -x trusted.glusterfs.volume-id/export/sdb1/brick && setfattr -x trusted.gfid /export/sdb1/brick&& rm -rf /export/sdb1/brick/..glusterfs

setfattr: /export/sdb1/brick: No suchattribute

[root@node1 sdb1]# gluster volume createtestvol replica 2 transport tcp node1:/export/sdb1/bricknode2:/export/sdb1/brick

volume create: testvol: success: pleasestart the volume to access data

[root@node1

sdb1]#gluster volume start testvol

volume start: testvol: success

[root@node1

sdb1]#gluster volume status

Status of volume: testvol

Gluster processTCP PortRDMA PortOnlinePid

------------------------------------------------------------------------------

Brick node1:/export/sdb1/brick491520Y2429

Brick node2:/export/sdb1/brick491520Y2211

Self-heal Daemon on localhostN/AN/AY2449

Self-heal Daemon on node2N/AN/AY2231

Task Status of Volume testvol

------------------------------------------------------------------------------

There are no active volume tasks

可以参照下边的两篇文章：

glusterfs volume create: testvol: failed: /data/brick1 ora prefix of it is already part of a volume

在创建volume的时候提示如下报错

[root@gluster-node1 ~]# gluster volumecreate testvol 192.168.11.139:/data/brick1 192.168.11.140:/data/brick2forcevolume create: testvol: failed: /data/brick1 or a prefix of it is alreadypart of a volume

找到了国外的一篇博客，据这篇博客讲。从glusterfs3.3开始，有一个新的变化就是会检测这个目录是否已经加入了volume。这就导致了很多gluster支持的问题。

假如你移除了一个volume的brick并且继续使用这个volume，然后重新添加之前的这个brick，这时你的文件状态就会改变。就会造成一系列的问题。它们中的大多数会引起数据丢失。

假如你重新使用一个brick的话，请确保你知道自己在做什么

解决办法就是：

setfattr -x trusted.glusterfs.volume-id $brick_path

setfattr -x trusted.gfid $brick_path

rm -rf $brick_path/.glusterfs

7[root@gluster-node1 data]# setfattr -x trusted.glusterfs.volume-id /data/ctdb/

[root@gluster-node1 data]# setfattr -x trusted.gfid /data/ctdb/

[root@gluster-node1 data]# rm -rf /data/ctdb/.

./ ../ .glusterfs/

[root@gluster-node1 data]# rm -rf /data/ctdb/.glusterfs

[root@gluster-node1 data]# service glusterd restart

Starting glusterd: [确定]

不要担心提示说属性不存在，只要它不存在，那它就处于健康的状态

最后，重启一下glusterfs来确保它并没有“记起来”旧的bricks

有些可能翻译的不到位，可以查看原文

https://joejulian.name/blog/glusterfs-path-or-a-prefix-of-it-is-already-part-of-a-volume/

#glusterfs

error

）

GlusterFS: {path} or a prefix of it is already part of avolume

Starting

with GlusterFS 3.3, one change has been the check to see if a directory (or any

of it's ancestors) is already part of a volume. This is causing many support

questions in#gluster.

Thiswas implemented because if you remove a brick from a volume and continue to usethe volume, you can get file into a state where re-adding a former brick cancause all sort of problems, many of which can result in data loss.

Ifyou're going to reuse a brick, make sure you know what you're doing.

The Solution

Forthe directory (or any parent directories) that was formerly part of a volume, simply:

setfattr -x trusted.glusterfs.volume-id $brick_path

setfattr -x trusted.gfid $brick_path

rm -rf $brick_path/.glusterfs

Don'tworry if it says that the attribute does not exist. As long as it doesn'texist, you're in good shape.

Finally,restart glusterd to ensure it's not "remembering" the old bricks.

See

thebugzilla entryfor more details and see Jeff Darcy's article for more

information about how GlusterFS usesextended attributes.

[python]view plain copy

1.[root@test glusterfs]# gluster volume create hello replica 3 test.144:/data0/glusterfs test.145:/data0/glusterfs test.146:/data0/glusterfs

2.volume create: hello: success: please start the volume to access data

3.[root@test glusterfs]# gluster volume delete hello

4.Deleting volume will erase all information about the volume. Do you want tocontinue? (y/n) y

5.volume delete: hello: success

6.[root@test glusterfs]# gluster volume create gfs replica 3 test.144:/data0/glusterfs test.145:/data0/glusterfs test.146:/data0/glusterfs

7.volume create: gfs: failed: Staging failed on test.144.Error: /data0/glusterfsisalready part of a volume

8.Staging failed on test.146.Error: /data0/glusterfsisalready part of a volume

9.Staging failed on test.145.Error: /data0/glusterfsisalready part of a volume

10.[root@test glusterfs]# ssh test.144 'setfattr -x trusted.glusterfs.volume-id /data0/glusterfs/ && setfattr -x trusted.gfid /data0/glusterfs/ && rm -rf /data0/glusterfs/..glusterfs'

11.setfattr: /data0/glusterfs/: No such attribute

12.[root@test glusterfs]# ssh test.145 'setfattr -x trusted.glusterfs.volume-id /data0/glusterfs/ && setfattr -x trusted.gfid /data0/glusterfs/ && rm -rf /data0/glusterfs/..glusterfs'

13.setfattr: /data0/glusterfs/: No such attribute

14.[root@test glusterfs]# ssh test.146 'setfattr -x trusted.glusterfs.volume-id /data0/glusterfs/ && setfattr -x trusted.gfid /data0/glusterfs/ && rm -rf /data0/glusterfs/..glusterfs'

15.setfattr: /data0/glusterfs/: No such attribute

16.[root@test glusterfs]#

17.[root@test glusterfs]# gluster volume create gfs replica 3 test.144:/data0/glusterfs test.145:/data0/glusterfs test.146:/data0/glusterfs

18.volume create: gfs: success: please start the volume to access data

19.[root@test glusterfs]#

查看node2防火墙规则是否适当，网络是否通顺

3.之前brick在集群里边，后来踢出来，再加报错处理

[root@node1

brick]#gluster volume add-brick testvolnode3:/export/sdb1/brick node4:/export/sdb1/brick node3:/export/sdc1/bricknode4:/export/sdc1/brick

volume add-brick: failed: Pre Validationfailed on node3. /export/sdb1/brick is already part of a volume

Pre Validation failed on node4./export/sdb1/brick is already part of a volume

[root@node1

brick]#gluster volume add-brick testvolnode3:/export/sdb1/brick node4:/export/sdb1/brick node3:/export/sdc1/bricknode4:/export/sdc1/brick

volume add-brick: success

官方安装手册

Step 1 – Have atleast two nodes

·Fedora 22 (or later) on two nodes named"server1" and "server2"

·A working network connection

·At least two virtual disks, one for the OS installation,and one to be used to serve GlusterFS storage (sdb). This will emulate a realworld deployment, where you would want to separate GlusterFS storage from theOS install.

·Note: GlusterFS stores its dynamically generatedconfiguration files at /var/lib/glusterd. If at any point in time GlusterFS isunable to write to these files (for example, when the backing filesystem isfull), it will at minimum cause erratic behavior for your system; or worse,take your system offline completely. It is advisable to create separatepartitions for directories such as /var/log to ensure this does not happen.

Step 2 - Formatand mount the bricks

(on both nodes): Note: These examplesare going to assume the brick is going to reside on /dev/sdb1.

mkfs.xfs -isize=512/dev/sdb1

mkdir -p/data/brick1

echo'/dev/sdb1 /data/brick1 xfs defaults 1 2'>> /etc/fstab

mount -a&& mount

You should now see sdb1 mounted at/data/brick1

Step 3 -Installing GlusterFS

(on both servers) Install the software

yuminstallglusterfs-server

Start the GlusterFS management daemon:

service glusterd start

service glusterd status

glusterd.service -LSB:glusterfs server

Loaded: loaded (/etc/rc.d/init.d/glusterd)

Active: active (running) since Mon,13Aug201213:02:11-0700;2s ago

Process:19254ExecStart=/etc/rc.d/init.d/glusterd start (code=exited, status=0/SUCCESS)

CGroup: name=systemd:/system/glusterd.service

├19260/usr/sbin/glusterd -p /run/glusterd.pid

├19304/usr/sbin/glusterfsd --xlator-option georep-server.listen-port=24009-s localhost…

└19309/usr/sbin/glusterfs -f /var/lib/glusterd/nfs/nfs-server.vol -p/var/lib/glusterd/…

Step 4 -Configure the trusted pool

From "server1"

glusterpeer probe server2

Note: When using hostnames, the firstserver needs to be probed fromoneother server to setits hostname.

From "server2"

glusterpeer probe server1

Note: Once this pool has beenestablished, only trusted members may probe new servers into the pool. A newserver cannot probe the pool, it must be probed from the pool.

Step 5 - Set upa GlusterFS volume

On both server1 and server2:

mkdir -p /data/brick1/gv0

From any single server:

gluster volumecreategv0 replica2server1:/data/brick1/gv0 server2:/data/brick1/gv0

gluster volumestartgv0

Confirm that the volume shows"Started":

glustervolumeinfo

Note: If the volume is not started,clues as to what went wrong will be in log files under /var/log/glusterfs onone or both of the servers - usually in etc-glusterfs-glusterd.vol.log

Step 6 - Testingthe GlusterFS volume

For this step, we will use one of theservers to mount the volume. Typically, you would do this from an externalmachine, known as a "client". Since using this method would requireadditional packages to be installed on the client machine, we will use one ofthe servers as a simple place to test first, as if it were that"client".

mount -t glusterfs server1:/gv0 /mnt

foriin`seq -w 1 100`;docp -rp /var/log/messages /mnt/copy-test-$i; done

First, check the mount point:

ls-lA/mnt | wc -l

You should see 100 files returned. Next,check the GlusterFS mount points on each server:

ls -lA /data/brick1/gv0

You should see 100 files on each serverusing the method we listed here. Without replication, in a distribute onlyvolume (not detailed here), you should see about 50 files on each one.

1.Configure Firewall（最好关闭防火墙）

For the Gluster to communicate within a cluster either the firewallshave to be turned off or enable communication for each server.

iptables -IINPUT -p all -s `` -j ACCEPT

2. Configurethe trusted pool

Remember that the trusted pool is the term used to define a cluster

of nodes in Gluster. Choose a server to be your “primary” server. This is just

to keep things simple, you will generally want to run all commands from this

tutorial. Keep in mind, running many Gluster specific commands (like gluster

volume create) on one server in the cluster will execute the same command on

all other servers.（只需要在一台机器上执行）

3. Replace

nodename with hostname of the other server in the cluster, or IP address if you

don’t have DNS or /etc/hosts entries. Let say we want to connect to node02:（在DNS和/etc/hosts中都要设置）

gluster peerprobe node02

Notice that running gluster peer statusfrom the second node shows that the first node has already been added.

4. Partition

the disk（磁盘处理）

4.1Assuming you have a emptydisk at /dev/sdb:

fdisk /dev/sdb

4.2 And then create a single XFS partition using fdisk

Format thepartition

mkfs.xfs -i size=512 /dev/sdb1

4.3 Add an entry to /etc/fstab

echo "/dev/sdb1/export/sdb1 xfs defaults 0 0">> /etc/fstab

4.4Mount the partition as aGluster "brick"

mkdir -p /export/sdb1 && mount -a&& mkdir -p /export/sdb1/brick

Set up a Gluster volume

The most basic Gluster volume type is a“Distribute only” volume (also referred to as a “pure DHT” volume if you wantto impress the folks at the water cooler). This type of volume simplydistributes the data evenly across the available bricks in a volume. So, if Iwrite 100 files, on average, fifty will end up on one server, and fifty willend up on another. This is faster than a “replicated” volume, but isn’t aspopular since it doesn’t give you two of the most sought after features ofGluster — multiple copies of the data, and automatic failover if something goeswrong.

1.To set up a replicated volume:（设置复制卷）

gluster volumecreate gv0 replica 2 node01.mydomain.net:/export/sdb1/bricknode02.mydomain.net:/export/sdb1/brick

Breakingthis down into pieces:

the first part says to create a glustervolume named gv0 (the name is arbitrary, gv0 was chosen simply because it’sless typing than gluster_volume_0).

make the volume a replica volume

keep a copy of the data on at least 2bricks at any given time. Since we only have two bricks total, this means eachserver will house a copy of the data.

we specify which nodes to use, and whichbricks on those nodes. The order here is important when you have more bricks.

It is possible (as of the most currentrelease as of this writing, Gluster 3.3) to specify the bricks in a such a waythat you would make both copies of the data reside on a single node. This wouldmake for an embarrassing explanation to your boss when your bulletproof,completely redundant, always on super cluster comes to a grinding halt when asingle point of failure occurs.

2.Now, we can check to make sure things are working as expected:

# gluster volume info

And you should see results similar to thefollowing:

Volume Name: gv0

Type: Replicate

Volume ID: 8bc3e96b-a1b6-457d-8f7a-a91d1d4dc019

Status: Created

Number of Bricks: 1 x 2 = 2

Transport-type: tcp

Bricks:

Brick1: node01.yourdomain.net:/export/sdb1/brick

Brick2: node02.yourdomain.net:/export/sdb1/brick

This shows us essentially what we justspecified during the volume creation. The one this to mention is the Status. Astatus of Created means that the volume has been created, but hasn’t yet beenstarted, which would cause any attempt to mount the volume fail.

3.Now, we should start the volume.

# gluster volumestart gv0

其他资料：

支持的数据类型：

Gluster does not support so called“structured data”, meaning live, SQL databases. Of course, using Gluster tobackup and restore the database would be fine - Gluster is traditionally betterwhen usingfile sizes at of least 16KB(with a sweet spot around 128KB or so).

结构化数据不支持，但是可以用来备份和重新存储数据

硬件要求（是否可以是不同的硬件）

If you want to test on bare metal, sinceGluster is built with commodity hardware in mind, and because there is nocentralized meta-data server, a very simple cluster can be deployed with twobasic servers (2 CPU’s, 4GB of RAM each, 1 Gigabit network). This is sufficientto have a nice file share or a place to put some nightly backups. Gluster isdeployed successfully on all kinds of disks, from the lowliest 5200 RPM SATA tomightiest 1.21 gigawatt SSD’s. The more performance you need, the moreconsideration you will want to put into how much hardware to buy, but the greatthing about Gluster is that you can start small, and add on as your needs grow.

是否需要同样配置的主机

OK, but if I addservers on later, don’t they have to be exactly the same?

In a perfect world, sure. Having thehardware be the same means less troubleshooting when the fires start poppingup. But plenty of people deploy Gluster on mix and match hardware, andsuccessfully.

不需要

文件系统格式的要求建议XFS格式

Typically, XFS is recommended but it can beused with other filesystems as well. Most commonly EXT4 is used when XFS isn’t,but you can (and many, many people do) use another filesystem that suits you.Now that we understand that, we can define a few of the common terms used inGluster.

注意点：

we can define a few of the common termsused in Gluster.

·Atrusted poolrefers collectively tothe hosts in a given Gluster Cluster.

·Anodeor “server” refers to any serverthat is part of a trusted pool. In general, this assumes all nodes are in thesame trusted pool.

·Abrickis used to refer to any device(really this means filesystem) that is being used for Gluster storage.

·Anexportrefers to the mount path ofthe brick(s) on a given server, for example, /export/brick1

·The termGlobal Namespaceis a fancy wayof saying a Gluster volume

·AGluster volumeis a collection of oneor more bricks (of course, typically this is two or more). This is analogous to/etc/exports entries for NFS.

·GNFSandkNFS. GNFS is how we refer to ourinline NFS server. kNFS stands for kernel NFS, or, as most people would say,just plain NFS. Most often, you will want kNFS services disabled on the Glusternodes. Gluster NFS doesn't take any additional configuration and works justlike you would expect with NFSv3. It is possible to configure Gluster and NFSto live in harmony if you want to.

Other notes:

·For this test, if you do not have DNS set up, you can getaway with using /etc/hosts entries for the two nodes. However, when you movefrom this basic setup to using Gluster in production, correct DNS entries(forward and reverse) and NTP are essential.

·When you install the Operating System, do not format theGluster storage disks! We will use specific settings with the mkfs commandlater on when we set up Gluster. If you are testing with a single disk (notrecommended), make sure to carve out a free partition or two to be used byGluster later, so that you can format or reformat at will during your testing.

·Firewalls are great, except when they aren’t. For storage

servers, being able to operate in a trusted environment without firewalls can

mean huge gains in performance, and is recommended. In case you absolutely need

to set up a firewall, have a look atSetting up clientsfor information on the ports used

硬件要求（最小需求）

64位系统，1个cpu，1GRAM，8G存储

You will need to have at least two nodes witha 64 bit OS and a working network connection. At least one gig of RAM is thebare minimum recommended for testing, and you will want at least 8GB in anysystem you plan on doing any real work on. A single cpu is fine for testing, aslong as it is 64 bit.

####################################################################################

2.GlusterFS 安装配置

服务器规划:(vmware 实验)

操作系统

主机名

数据盘(2 块)

CentOS 6.8 x86_64

10.1.0.151

mystorage1

sdb:10G sdc:10G

CentOS 6.8 x86_64

10.1.0.152

mystorage2

sdb:10G sdc:10G

CentOS 6.8 x86_64

10.1.0.153

mystorage3

sdb:10G sdc:10G

CentOS 6.8 x86_64

10.1.0.154

mystorage4

sdb:10G sdc:10G

2.2.1 修改主机名

# vim /etc/sysconfig/network

执行 hostname 主机名；

主机名修改完毕

2.2.2 添加 hosts 文件实现集群主机之间相互能够解析

# vim /etc/hosts
10.1.0.151 mystorage1
10.1.0.152 mystorage2
10.1.0.153 mystorage3
10.1.0.154 mystorage4

2.2.3 关闭 SELinux 和防火墙

# sed -i 's#SELINUX=enforcing#SELINUX=disabled#' /etc/selinux/config

chkconfig iptables off

reboot

2.2.4 安装 EPEL 源

GlusterFS yum 源有部分包依赖 epel 源

# 移除/etc/yum.repos.d 中的原由yum源，更改为aliyun的源；

yum install epel-release -y

2.2.5 安装 GlusterFS 源及相关软件包

# yum install centos-release-gluster37.noarch -y

yum --enablerepo=centos-gluster*-test install glusterfs-server glusterfs-cli glusterfs-geo-replication -y

安装完成后的包

rpm -qa | grep gluster*
centos-release-gluster37-1.0-4.el6.centos.noarch
glusterfs-api-3.7.13-1.el6.x86_64
glusterfs-3.7.13-1.el6.x86_64
glusterfs-client-xlators-3.7.13-1.el6.x86_64
glusterfs-fuse-3.7.13-1.el6.x86_64
glusterfs-server-3.7.13-1.el6.x86_64
glusterfs-libs-3.7.13-1.el6.x86_64
glusterfs-cli-3.7.13-1.el6.x86_64
glusterfs-geo-replication-3.7.13-1.el6.x86_64

2.3.1 查看 GlusterFS 版本信息

使用 glusterfs -V 命令

[root@mystorage1 ~]# glusterfs -V
glusterfs 3.7.20 built on Jan 30 2017 15:39:27

2.3.2启动、停止服务

# 四台虚机上都执行

/etc/init.d/glusterd start

/etc/init.d/glusterd status

chkconfig glusterd on

2.3.3 存储主机加入信任主机池

在一台主机上执行，将其他主机加入，如下是在 mystorage1 上执行

[root@mystorage1 ~]# gluster peer probe mystorage2
peer probe: success.
[root@mystorage1 ~]# gluster peer probe mystorage3
peer probe: success.
[root@mystorage1 ~]# gluster peer probe mystorage4
peer probe: success.

2.3.4查看状态

在其他机器查看状态：

[root@mystorage2 ~]# gluster peer status
Number of Peers: 3

Hostname: mystorage1
Uuid: 6e6a84af-ac7a-44eb-85c9-50f1f46acef1
State: Peer in Cluster (Connected)

Hostname: mystorage3
Uuid: 36e4c45c-466f-47b0-b829-dcd4a69ca2e7
State: Peer in Cluster (Connected)

Hostname: mystorage4
Uuid: c607f6c2-bdcb-4768-bc82-4bc2243b1b7a
State: Peer in Cluster (Connected)

2.3.5 配置前的准备工作

安装 xfs 支持包（ext4文件格式支持16TB的磁盘大小，而xfs是PB级别的）

# 四台都执行
# yum install xfsprogs -y

fdisk -l 查看磁盘设备

# fdisk /dev/sdb
n
p
1
w
** 线上是可以不做这一步的；

# 解释说明：
　　如果磁盘大于 2T 的话就用 parted 来分区，这里我们不用分区（可以不分区）；
　　做分布式文件系统的时候数据盘一般不需要做 RAID，一般系统盘会做 RAID 1；
　　如果有raid卡的话，最好用上，raid卡有数据缓存功能，也能提高磁盘的iops，最好的话，用RAID 5；
　　如果都不做raid的话，也是没问题的，glusterfs也是可以保证数据的安全的。

格式化创建文件系统

# 四台都执行
# mkfs.xfs -f /dev/sdb

在四台机器上创建挂载块设备的目录，挂载硬盘到目录：

# 四台都执行

mkdir -p /storage/brick{1..2}

mount /dev/sdb /storage/brick1

df -h

# 加入开机自动挂载
# echo "/dev/sdb /storage/brick1 xfs defaults 0 0" >>/etc/fstab
# mount -a

2.3.6 创建 volume 及其他操作

GlusterFS 五种卷

Distributed：分布式卷，文件通过 hash 算法随机分布到由 bricks 组成的卷上。
Replicated: 复制式卷，类似 RAID 1，replica 数必须等于 volume 中 brick 所包含的存储服务器数，可用性高。
Striped: 条带式卷，类似 RAID 0，stripe 数必须等于 volume 中 brick 所包含的存储服务器数，文件被分成数据块，以 Round Robin 的方式存储在 bricks 中，并发粒度是数据块，大文件性能好。
Distributed Striped: 分布式的条带卷，volume中 brick 所包含的存储服务器数必须是 stripe 的倍数（>=2倍），兼顾分布式和条带式的功能。
Distributed Replicated: 分布式的复制卷，volume 中 brick 所包含的存储服务器数必须是 replica 的倍数（>=2倍），兼顾分布式和复制式的功能。

　　　　　　　　　　　　　　分布式复制卷的brick顺序决定了文件分布的位置，一般来说，先是两个brick形成一个复制关系，然后两个复制关系形成分布。

glustfs 最常用的卷就是分布式复制卷。
striped 的目的就提高性能，读取更快。

企业一般用后两种，大部分会用分布式复制（可用容量为总容量/复制份数），通过网络传输的话最好用万兆交换机，万兆网卡来做。这样就会优化一部分性能。它们的数据都是通过网络来传输的。

1）分布式卷

# 创建分布式卷
[root@mystorage1 ~]# gluster volume create gv1 mystorage1:/storage/brick1 mystorage2:/storage/brick1 force
volume create: gv1: success: please start the volume to access data

启动创建的卷

[root@mystorage1 ~]# gluster volume start gv1
volume start: gv1: success

在另一台机器（mystorage4）查看卷信息

[root@mystorage4 ~]# gluster volume info

Volume Name: gv1
Type: Distribute
Volume ID: b6ec2f8a-d1f0-4d1b-806b-238efb6dcb84
Status: Started
Number of Bricks: 2
Transport-type: tcp
Bricks:
Brick1: mystorage1:/storage/brick1
Brick2: mystorage2:/storage/brick1
Options Reconfigured:
performance.readdir-ahead: on

挂载卷到目录

[root@mystorage4 ~]# mount -t glusterfs 127.0.0.1:/gv1 /mnt
[root@mystorage4 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 33G 1.3G 30G 5% /
tmpfs 242M 0 242M 0% /dev/shm
/dev/sda1 976M 38M 888M 5% /boot
/dev/sdb 10G 33M 10G 1% /storage/brick1
127.0.0.1:/gv1 20G 65M 20G 1% /mnt

在 mystorage1 创建测试文件

[root@mystorage1 ~]# touch /mnt/{a..d}
[root@mystorage1 ~]# ll /mnt
total 0
-rw-r--r-- 1 root root 0 Jul 30 00:54 a
-rw-r--r-- 1 root root 0 Jul 30 00:54 b
-rw-r--r-- 1 root root 0 Jul 30 00:54 c
-rw-r--r-- 1 root root 0 Jul 30 00:54 d

在 mystorage4 也可看到新创建的文件，信任存储池中的每一台主机挂载这个卷后都可以看到

[root@mystorage4 ~]# ll /mnt/
total 0
-rw-r--r-- 1 root root 0 Jul 30 00:54 a
-rw-r--r-- 1 root root 0 Jul 30 00:54 b
-rw-r--r-- 1 root root 0 Jul 30 00:54 c
-rw-r--r-- 1 root root 0 Jul 30 00:54 d

文件实际存在位置

[root@mystorage1 ~]# ls /storage/brick1
a b c e
[root@mystorage2 ~]# ls /storage/brick1
d

上面可以看到文件根据 hash 算法随机分布到由不同的 brick 上

使用 NFS 方式挂载

[root@mystorage3 ~]# mount -o mountproto=tcp -t nfs mystorage1:/gv1 /mnt/
[root@mystorage3 ~]# ll /mnt
total 0
-rw-r--r-- 1 root root 0 Jul 30 00:54 a
-rw-r--r-- 1 root root 0 Jul 30 00:54 b
-rw-r--r-- 1 root root 0 Jul 30 00:54 c
-rw-r--r-- 1 root root 0 Jul 30 00:54 d

[root@mystorage2 ~]# mount -o mountproto=tcp -t nfs 192.168.56.13:/gv1 /mnt/

host 可以写 IP，可以看到这个 mystorage3 的 IP，说明 gv1 是共享给信任存储池的所有主机的

[root@mystorage2 ~]# ll /mnt/
total 0
-rw-r--r-- 1 root root 0 Jul 30 00:54 a
-rw-r--r-- 1 root root 0 Jul 30 00:54 b
-rw-r--r-- 1 root root 0 Jul 30 00:54 c
-rw-r--r-- 1 root root 0 Jul 30 00:54 d

2）复制式卷

# 创建复制式卷
[root@mystorage1 ~]# gluster volume create gv2 replica 2 mystorage3:/storage/brick1 mystorage4:/storage/brick1 force
volume create: gv2: success: please start the volume to access data

启动创建的卷

[root@mystorage1 ~]# gluster volume start gv2
volume start: gv2: success

查看卷信息

[root@mystorage1 ~]# gluster volume info gv2

Volume Name: gv2
Type: Replicate
Volume ID: 11928696-263a-4c7a-a155-5115af29221f
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: mystorage3:/storage/brick1
Brick2: mystorage4:/storage/brick1
Options Reconfigured:
performance.readdir-ahead: on

挂载卷到目录，创建测试文件

[root@mystorage1 ~]# mount -t glusterfs 127.0.0.1:/gv2 /opt
[root@mystorage1 ~]# touch /opt/{a..d}
[root@mystorage1 ~]# ls /opt
a b c d

在 mystorage3,4 可看到新创建的文件

[root@mystorage3 ~]# mount -t glusterfs 127.0.0.1:/gv2 /opt
[root@mystorage3 ~]# ls /opt/
a b c d

[root@mystorage4 ~]# mount -t glusterfs 127.0.0.1:/gv2 /opt
[root@mystorage4 ~]# ls /opt/
a b c d

文件实际存在位置

[root@mystorage3 ~]# ls /storage/brick1
a b c d
[root@mystorage4 ~]# ls /storage/brick1
a b c d

上面可以看到文件根据在 2 台机器上的 brick 上都有

格式化挂载第二块硬盘

# mkfs.xfs -f /dev/sdc

mkdir -p /storage/brick2

echo "/dev/sdc /storage/brick2 xfs defaults 0 0" >> /etc/fstab

mount -a

df -h

3）分布式条带卷

# 创建分布式条带卷
[root@mystorage1 ~]# gluster volume create gv3 stripe 2 mystorage3:/storage/brick2 mystorage4:/storage/brick2 force
volume create: gv3: success: please start the volume to access data

启动创建的卷

[root@mystorage1 ~]# gluster volume start gv3
volume start: gv3: success

查看卷信息

[root@mystorage1 ~]# gluster volume info gv3

Volume Name: gv3
Type: Stripe
Volume ID: 2871801f-b125-465c-be3a-4eeb2fb44916
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: mystorage3:/storage/brick2
Brick2: mystorage4:/storage/brick2
Options Reconfigured:
performance.readdir-ahead: on

挂载卷到目录，创建测试文件

mkdir /gv1 /gv2 /gv3
mount -t glusterfs 127.0.0.1:gv1 /gv1
mount -t glusterfs 127.0.0.1:gv2 /gv2
mount -t glusterfs 127.0.0.1:gv3 /gv3
df -h

dd if=/dev/zero bs=1024 count=10000 of=/gv3/10M.file
dd if=/dev/zero bs=1024 count=20000 of=/gv3/20M.file

查看新创建的文件

[root@mystorage1 ~]# ll /gv3/
total 30000
-rw-r--r-- 1 root root 10240000 Jul 30 02:26 10M.file
-rw-r--r-- 1 root root 20480000 Jul 30 02:26 20M.file

文件实际存放位置

[root@mystorage3 ~]# ll -h /storage/brick2/
total 15M
-rw-r--r-- 2 root root 4.9M Jul 30 02:26 10M.file
-rw-r--r-- 2 root root 9.8M Jul 30 02:26 20M.file
[root@mystorage4 ~]# ll -h /storage/brick2/
total 15M
-rw-r--r-- 2 root root 4.9M Jul 30 02:25 10M.file
-rw-r--r-- 2 root root 9.8M Jul 30 02:26 20M.file

上面可以看到 10M 20M 的文件分别分成了 2 块（这是条带的特点），每块又分别在同的 brick 下（这是分布式的特点）

4）分布式复制卷

# 查看复制式卷的效果
cd /gv2
rm -f *
dd if=/dev/zero bs=1024 count=10000 of=/gv2/10M.file
dd if=/dev/zero bs=1024 count=20000 of=/gv2/20M.file
dd if=/dev/zero bs=1024 count=30000 of=/gv2/30M.file

[root@mystorage3 ~]# ll -h /storage/brick1/
total 59M
-rw-r--r-- 2 root root 9.8M Jul 30 02:41 10M.file
-rw-r--r-- 2 root root 20M Jul 30 02:41 20M.file
-rw-r--r-- 2 root root 30M Jul 30 02:41 30M.file
[root@mystorage4 ~]# ll -h /storage/brick1
total 59M
-rw-r--r-- 2 root root 9.8M Jul 30 02:40 10M.file
-rw-r--r-- 2 root root 20M Jul 30 02:40 20M.file
-rw-r--r-- 2 root root 30M Jul 30 02:40 30M.file

gv2 添加 brick 进行扩容

[root@mystorage1 ~]# gluster volume stop gv2
Stopping volume will make its data inaccessible. Do you want to continue? (y/n) y

[root@mystorage1 ~]# gluster volume add-brick gv2 replica 2 mystorage1:/storage/brick2 mystorage2:/storage/brick2 force
volume add-brick: success

[root@mystorage1 ~]# gluster volume start gv2
volume start: gv2: success

[root@mystorage1 ~]# gluster volume info gv2

Volume Name: gv2
Type: Distributed-Replicate # 这里显示是分布式复制卷，是在 gv2 复制卷的基础上增加 2 块 brick 形成的
Volume ID: 11928696-263a-4c7a-a155-5115af29221f
Status: Stopped
Number of Bricks: 2 x 2 = 4
Transport-type: tcp
Bricks:
Brick1: mystorage3:/storage/brick1
Brick2: mystorage4:/storage/brick1
Brick3: mystorage1:/storage/brick2
Brick4: mystorage2:/storage/brick2
Options Reconfigured:
performance.readdir-ahead: on

注意：当你给分布式复制卷和分布式条带卷增加 bricks 时，你增加的 bricks 数目必须是复制或条带数目的倍数，例如：你给一个分布式复制卷的 replica 为 2，你在增加 bricks 的时候数量必须为2、4、6、8等。扩容后进行测试，发现文件都分布在扩容前的卷中。

分布式复制卷的最佳实践：

1)搭建条件
- 块服务器的数量必须是复制的倍数
- 将按块服务器的排列顺序指定相邻的块服务器成为彼此的复制
例如，8台服务器：
- 当复制副本为2时，按照服务器列表的顺序，服务器1和2作为一个复制,3和4作为一个复制,5和6作为一个复制,7和8作为一个复制
- 当复制副本为4时，按照服务器列表的顺序，服务器1/2/3/4作为一个复制,5/6/7/8作为一个复制
2)创建分布式复制卷

# gluster volume create test-volume replica 2 transport tcp server1:/exp1 server2:/exp2 server3:/exp3 server4:/exp4
Creation of test-volume has been successful
Please start the volume to access data
参考博客：
http://cmdschool.blog.51cto.com/2420395/1828450

磁盘存储的平衡

注意：平衡布局是很有必要的，因为布局结构是静态的，当新的 bricks 加入现有卷，新创建的文件会分布到旧的 bricks 中，所以需要平衡布局结构，使新加入的 bricks 生效。布局平衡只是使新布局生效，并不会在新的布局中移动老的数据，如果你想在新布局生效后，重新平衡卷中的数据，还需要对卷中的数据进行平衡。

# 再在 /gv2 下创建 2 个新的文件 10M.file1 20M.file1

[root@mystorage1 ~]# dd if=/dev/zero bs=1024 count=10000 of=/gv2/10M.file1
[root@mystorage1 ~]# dd if=/dev/zero bs=1024 count=20000 of=/gv2/20M.file1
[root@mystorage1 ~]# ll -rht /gv2/
total 88M
-rw-r--r-- 1 root root 9.8M Jul 30 02:40 10M.file
-rw-r--r-- 1 root root 20M Jul 30 02:40 20M.file
-rw-r--r-- 1 root root 30M Jul 30 02:40 30M.file
-rw-r--r-- 1 root root 9.8M Jul 30 03:10 10M.file1
-rw-r--r-- 1 root root 20M Jul 30 03:10 20M.file1

[root@mystorage1 ~]# ll /storage/brick2
total 0
[root@mystorage2 ~]# ll /storage/brick2
total 0
[root@mystorage3 ~]# ll -hrt /storage/brick1
total 88M
-rw-r--r-- 2 root root 9.8M Jul 30 02:41 10M.file
-rw-r--r-- 2 root root 20M Jul 30 02:41 20M.file
-rw-r--r-- 2 root root 30M Jul 30 02:41 30M.file
-rw-r--r-- 2 root root 9.8M Jul 30 03:12 10M.file1
-rw-r--r-- 2 root root 20M Jul 30 03:13 20M.file1
[root@mystorage4 ~]# ll -hrt /storage/brick1
total 88M
-rw-r--r-- 2 root root 9.8M Jul 30 02:40 10M.file
-rw-r--r-- 2 root root 20M Jul 30 02:40 20M.file
-rw-r--r-- 2 root root 30M Jul 30 02:40 30M.file
-rw-r--r-- 2 root root 9.8M Jul 30 03:10 10M.file1
-rw-r--r-- 2 root root 20M Jul 30 03:10 20M.file1

从上面可以看到，新创建的文件还是在之前的 bricks 中，并没有分布中新加的 bricks 中

下面进行磁盘存储平衡

[root@mystorage1 ~]# gluster volume rebalance gv2 start
volume rebalance: gv2: success: Rebalance on gv2 has been started successfully. Use rebalance status command to check status of the rebalance process.
ID: e23213be-7771-4a2b-87b4-259fd048ec46

[root@mystorage1 ~]# gluster volume rebalance gv2 status
Node Rebalanced-files size scanned failures skipped status run time in hⓂ️s
--------- ----------- ----------- ----------- ----------- ----------- ------------ --------------
localhost 0 0Bytes 0 0 0 completed 0:0:1
mystorage2 0 0Bytes 0 0 0 completed 0:0:0
mystorage3 2 39.1MB 5 0 0 completed 0:0:2
mystorage4 0 0Bytes 0 0 0 completed 0:0:1
volume rebalance: gv2: success

查看磁盘存储平衡后文件在 bricks 中的分布情况

[root@mystorage1 ~]# ll /storage/brick2
total 40000
-rw-r--r-- 2 root root 20480000 Jul 30 02:41 20M.file
-rw-r--r-- 2 root root 20480000 Jul 30 03:13 20M.file1
[root@mystorage2 ~]# ll /storage/brick2
total 40000
-rw-r--r-- 2 root root 20480000 Jul 30 02:41 20M.file
-rw-r--r-- 2 root root 20480000 Jul 30 03:13 20M.file1
[root@mystorage3 ~]# ll -hrt /storage/brick1
total 49M
-rw-r--r-- 2 root root 9.8M Jul 30 02:41 10M.file
-rw-r--r-- 2 root root 30M Jul 30 02:41 30M.file
-rw-r--r-- 2 root root 9.8M Jul 30 03:12 10M.file1
[root@mystorage4 ~]# ll -hrt /storage/brick1
total 49M
-rw-r--r-- 2 root root 9.8M Jul 30 02:40 10M.file
-rw-r--r-- 2 root root 30M Jul 30 02:40 30M.file
-rw-r--r-- 2 root root 9.8M Jul 30 03:10 10M.file1

从上面可以看到 20M.file 20M.file1 2 个文件平衡到新加的 2 个 brick 中了

每做一次扩容后都需要做一次磁盘平衡。磁盘平衡是在万不得已的情况下再做的，一般再创建一个卷就可以了。

移除 brick

你可能想在线缩小卷的大小，例如：当硬件损坏或网络故障的时候，你可能想在卷中移除相关的 bricks。
注意：当你移除 bricks 的时候，你在 gluster 的挂载点将不能继续访问数据，只有配置文件中的信息移除后你才能继续访问 bricks 中的数据。当移除分布式复制卷或者分布式条带卷的时候，移除的 bricks 数目必须是 replica 或者 stripe 的倍数。
例如：一个分布式条带卷的 stripe 是 2，当你移除 bricks 的时候必须是 2、4、6、8 等。

# 下面移除 gv2 卷的 2 个 bricks

[root@mystorage1 ~]# gluster volume stop gv2
Stopping volume will make its data inaccessible. Do you want to continue? (y/n) y
volume stop: gv2: success
[root@mystorage1 ~]# gluster volume remove-brick gv2 replica 2 mystorage3:/storage/brick1 mystorage4:/storage/brick1 force
Removing brick(s) can result in data loss. Do you want to Continue? (y/n) y
volume remove-brick commit force: success
[root@mystorage1 ~]# gluster volume start gv2
volume start: gv2: success
[root@mystorage1 ~]# ll /gv2/
total 40000
-rw-r--r-- 1 root root 20480000 Jul 30 02:41 20M.file
-rw-r--r-- 1 root root 20480000 Jul 30 03:13 20M.file1

如果误操作删除了后，其实文件还在 /storage/brick1 里面的，加回来就可以了

Volume Name: gv2
Type: Distributed-Replicate
Volume ID: 11928696-263a-4c7a-a155-5115af29221f
Status: Stopped
Number of Bricks: 2 x 2 = 4
Transport-type: tcp
Bricks:
Brick1: mystorage1:/storage/brick2
Brick2: mystorage2:/storage/brick2
Brick3: mystorage3:/storage/brick1
Brick4: mystorage4:/storage/brick1
Options Reconfigured:
performance.readdir-ahead: on
[root@mystorage1 ~]# gluster volume start gv2
volume start: gv2: success
[root@mystorage1 ~]# ll /gv2/ # 文件还在
total 90000
-rw-r--r-- 1 root root 10240000 Jul 30 02:40 10M.file
-rw-r--r-- 1 root root 10240000 Jul 30 03:10 10M.file1
-rw-r--r-- 1 root root 20480000 Jul 30 02:41 20M.file
-rw-r--r-- 1 root root 20480000 Jul 30 03:13 20M.file1
-rw-r--r-- 1 root root 30720000 Jul 30 02:40 30M.file

删除卷

一般会用在命名不规范的时候才会删除

[root@mystorage1 ~]# umount /gv1
[root@mystorage1 ~]# gluster volume stop gv1
Stopping volume will make its data inaccessible. Do you want to continue? (y/n) y
volume stop: gv1: success
[root@mystorage1 ~]# gluster volume delete gv1
Deleting volume will erase all information about the volume. Do you want to continue? (y/n) y
volume delete: gv1: success
[root@mystorage1 ~]# gluster volume info gv1
Volume gv1 does not exist

VMware WorkStation在线加硬盘：

# echo "- - -" > /sys/class/scsi_host/host2/scan

fdisk -l

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GlusterFS数据存储脑裂修复方案最全解析

学习GlusterFS（七）

2.GlusterFS 安装配置

2.2.1 修改主机名

2.2.2 添加 hosts 文件实现集群主机之间相互能够解析

2.2.3 关闭 SELinux 和 防火墙

chkconfig iptables off

reboot

2.2.4 安装 EPEL 源

yum install epel-release -y

2.2.5 安装 GlusterFS 源及相关软件包

yum --enablerepo=centos-gluster*-test install glusterfs-server glusterfs-cli glusterfs-geo-replication -y

安装完成后的包

2.3.1 查看 GlusterFS 版本信息

2.3.2启动、停止服务

/etc/init.d/glusterd start

/etc/init.d/glusterd status

chkconfig glusterd on

2.3.3 存储主机加入信任主机池

2.3.4查看状态

2.3.5 配置前的准备工作

mkdir -p /storage/brick{1..2}

mount /dev/sdb /storage/brick1

df -h

2.3.6 创建 volume 及其他操作

启动创建的卷

在另一台机器（mystorage4）查看卷信息

挂载卷到目录

在 mystorage1 创建测试文件

在 mystorage4 也可看到新创建的文件，信任存储池中的每一台主机挂载这个卷后都可以看到

文件实际存在位置

上面可以看到文件根据 hash 算法随机分布到由不同的 brick 上

host 可以写 IP，可以看到这个 mystorage3 的 IP，说明 gv1 是共享给信任存储池的所有主机的

启动创建的卷

查看卷信息

挂载卷到目录，创建测试文件

在 mystorage3,4 可看到新创建的文件

文件实际存在位置

上面可以看到文件根据在 2 台机器上的 brick 上都有

mkdir -p /storage/brick2

echo "/dev/sdc /storage/brick2 xfs defaults 0 0" >> /etc/fstab

mount -a

df -h

启动创建的卷

查看卷信息

挂载卷到目录，创建测试文件

查看新创建的文件

文件实际存放位置

上面可以看到 10M 20M 的文件分别分成了 2 块（这是条带的特点），每块又分别在同的 brick 下（这是分布式的特点）

gv2 添加 brick 进行扩容

从上面可以看到，新创建的文件还是在之前的 bricks 中，并没有分布中新加的 bricks 中

下面进行磁盘存储平衡

查看磁盘存储平衡后文件在 bricks 中的分布情况

从上面可以看到 20M.file 20M.file1 2 个文件 平衡到 新加的 2 个 brick 中了

如果误操作删除了后，其实文件还在 /storage/brick1 里面的，加回来就可以了

fdisk -l

2.2.3 关闭 SELinux 和防火墙

从上面可以看到 20M.file 20M.file1 2 个文件平衡到新加的 2 个 brick 中了