redis安装+redis集群配置+phpredis扩展安装
摘取天上星(整理) 安装前的准备：
redis-3.0tar.gz 官网下载地址 http://redis.io/download/
以下软件或直接yum安装也可（安装步骤略）
tcl8.6.1-src.tar.gz 官网下载地址 http://sourceforge.jp/projects/sfnet_tcl/releases/
rubygems-2.4.2.zip 官网下载地址 http://rubygems.org/pages/download/
redis-3.0.0.gem 官网下载地址 http://rubygems.org/gems/redis/versions/3.1.0
安装redis依赖包tcl
tar xzvf tcl8.6.1-src.tar.gz
cd tcl8.6.1/
cd unix &&
./configure --prefix=/usr \
--without-tzdata \
--mandir=/usr/share/man \
$([ $(uname -m) = x86_64 ] && echo --enable-64bit) &&
make &&
sed -e "s@^\(TCL_SRC_DIR='\).*@\1/usr/include'@" \
-e "/TCL_B/s@='\(-L\)\?.*unix@='\1/usr/lib@" \
-i tclConfig.sh
# 测试make是否成功，最好不要，要等半个多小时
make test
# root用户登录，执行下面命令
make install &&
make install-private-headers &&
ln -v -sf tclsh8.6 /usr/bin/tclsh &&
chmod -v 755 /usr/lib/libtcl8.6.so
如果没有tcl，将会报错如下:
[root@localhost redis-3.0.0-beta8]# make test
cd src && make test
make[1]: Entering directory `/root/redis-3.0.0-beta8/src'
You need tcl 8.5 or newer in order to run the Redis test
make[1]: *** [test] Error 1
make[1]: Leaving directory `/root/redis-3.0.0-beta8/src'
make: *** [test] Error 2
[root@localhost redis-3.0.0-beta8]#
安装redis前需要先配置下面的内核参数，否则Redis脚本在重启或停止redis时，将会报错，并且不能自动在停止服务前同步数据到磁盘上
echo 1 > /proc/sys/vm/overcommit_memory
echo vm.overcommit_memory=1 >> /etc/sysctl.conf
sysctl vm.overcommit_memory=1
实验环境模拟：
192.168.1.222 三个实例
192.168.1.223 三个实例
注意，由于官网，必须至少6台服务器，所以鄙人笔记本过卡，直接用两台vm来虚拟，我用不同端口号来区分不同的redis实例即可。因为启动redis时只需要指定“该redis实例的配置文件”即可。在现实当中，如果有六台物理机，那样会更加简单部署，不会像我这么复杂，不过也不复杂，就是多copy一下配置文件而已。
redis安装
redis-3.0tar.gz 官网下载地址 http://redis.io/download/
安装过程指令如下：
$ mkdir /usr/local/redis
$ cd /home/Happy/down
$ wget https://github.com/antirez/redis/archive/3.0.0-rc1.tar.gz （或直接从官网下载即可）
$ tar xzf redis-3.0.tar.gz
$ cd redis-3.0
$ make PREFIX=/usr/local/redis install #安装redis到指定目录中
注意上面的最后一行，我们通过PREFIX指定了安装的目录。如果make失败，一般是你们系统中还未安装gcc,那么可以通过yum安装： 1 yum install gcc
安装完成后，继续执行make.
在安装redis成功后，你将可以在/usr/local/redis看到一个bin的目录，里面包括了以下文件：
redis-benchmark redis-check-aof redis-check-dump redis-cli redis-server
将redis做成一个服务
1.复制脚本到/etc/rc.d/init.d目录
ps: /etc/rc.d/init.d/目录下的脚本就类似与windows中的注册表，在系统启动的时候某些指定脚本将被执行
按以上步骤安装Redis时，其服务脚本位于：
/usr/local/src/redis/utils/redis_init_script
必须将其复制到/etc/rc.d/init.d的目录下：
cp /usr/local/src/redis/utils/redis_init_script /etc/rc.d/init.d/redis
将redis_init_script复制到/etc/rc.d/init.d/，同时重新命名为redis。
如果这时添加注册服务：
chkconfig --add redis
将报以下错误：
redis服务不支持chkconfig
为此，我们需要更改redis脚本。
2. 更改redis脚本
打开使用vi打开脚本，查看脚本信息： 1 vim /etc/rc.d/init.d/redis
看到的内容如下(下内容是更改好的信息)：
#!/bin/sh
#chkconfig: 2345 80 90
# Simple Redis init.d script conceived to work on Linux systems
# as it does use of the /proc filesystem.
REDISPORT=6379
EXEC=/usr/local/redis/bin/redis-server
CLIEXEC=/usr/local/redis/bin/redis-cli
PIDFILE=/var/run/redis_${REDISPORT}.pid
CONF="/etc/redis/${REDISPORT}.conf"
case "$1" in
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists, process is already running or crashed"
else
echo "Starting Redis server…"
$EXEC $CONF &
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does not exist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping …"
$CLIEXEC -p $REDISPORT shutdown
while [ -x /proc/${PID} ]
do
echo "Waiting for Redis to shutdown …"
sleep 1
done
echo "Redis stopped"
fi
;;
*)
echo "Please use start or stop as first argument"
;;
esac
和原配置文件相比：
1.原文件是没有以下第2行的内容的，1 #chkconfig: 2345 80 90
2.原文件EXEC、CLIEXEC参数，也是有所更改。
EXEC=/usr/local/redis/bin/redis-server
CLIEXEC=/usr/local/redis/bin/redis-cli
3.redis开启的命令，以后台运行的方式执行。1 $EXEC $CONF &
ps:注意后面的那个“&”，即是将服务转到后面运行的意思，否则启动服务时，Redis服务将占据在前台，占用了主用户界面，造成其它的命令执行不了。
4.将redis配置文件拷贝到/etc/redis/${REDISPORT}.conf
mkdir /etc/redis
cp /usr/local/src/redis/redis.conf /etc/redis/6379.conf
这样，redis服务脚本指定的CONF就存在了。默认情况下，Redis未启用认证，可以通过开启6379.conf的requirepass 指定一个验证密码。
以上操作完成后，即可注册redis服务：
设置redis 启动权限，并且开启自动启动模式
chmod 755 /etc/init.d/redis
chkconfig --add redis
chkconfig --level 345 redis on
chkconfig --list redis
启动redis
redis-server /etc/redis.conf
或者，可以用下面这条
service redis start
将Redis的命令所在目录添加到系统参数PATH中
修改profile文件：
vi /etc/profile
在最后行追加:
export PATH="$PATH:/usr/local/redis/bin"
然后马上应用这个文件：
/etc/profile
这样就可以直接调用redis-cli的命令了，如下所示：
$ redis-cli
redis 127.0.0.1:6379> auth superman
OK
redis 127.0.0.1:6379> ping
PONG
redis 127.0.0.1:6379>
至此，redis 就成功安装了。
编辑配置文件并开始集群设置的准备，修改下面几个参数
vim /etc/redis/6379.conf （编辑A的配置）
daemonize yes 修改no为yes，后台运行redis
port 6379
#dbfilename dump-6379.rdb
appendonly yes
appendfilename "appendonly-6379.aof"
logfile "/usr/local/redis/redis6379.log" 日志
cluster-enabled yes
cluster-config-file /usr/local/redis/nodes-6379.conf
cluster-node-timeout 5000
然后分别将刚才配置好的redis.conf文件 拷贝三份出来并设置里面如下参数的值分别为不同端口：
cp /etc/redis/6379.conf /etc/redis/6380.conf (B的配置)
cp /etc/redis/6379.conf /etc/redis/6381.conf (C的配置)
vim /etc/redis/6380.conf （编辑B的配置）
daemonize yes 修改no为yes，后台运行redis
port 6380
#dbfilename dump-6380.rdb
appendonly yes
appendfilename "appendonly-6380.aof"
logfile "/usr/local/redis/redis6380.log" 日志
cluster-enabled yes
cluster-config-file /usr/local/redis/nodes-6380.conf
cluster-node-timeout 5000
vim /etc/redis/6381.conf （编辑C的配置）
daemonize yes 修改no为yes，后台运行redis
port 6381
#dbfilename dump-6381.rdb
appendonly yes
appendfilename "appendonly-6381.aof"
logfile "/usr/local/redis/redis6381.log" 日志
cluster-enabled yes
cluster-config-file /usr/local/redis/nodes-6381.conf
cluster-node-timeout 5000
为什么要设置不同的端口呢？
因为，我们要在一台vm里面，虚拟三个实例
port 端口不一样，这个是肯定要的，不然服务都在同一个端口运行，就只能说是一个实例而已
appendonly 这个是说在后台运行，不要一关闭ssh，redis就挂了所以设置成yes为后台运行redis
appendfilename 这个默认就是appendonly.aof，如果我们不在后面加一个后缀区分，那么所有服务，他们的快照都会存放到在同一个文件 appendonly.aof，那边就会数据紊乱，A，B,C,三者数据都一样，所以，我们要区分出来，让他们一个实例，一个文件。这里还有一个主意的地方，那就是 它，不支持路径指定，你不能在 appendonly.aof 加一个 例如/usr/local/redis/appendonly.aof，否则会报错，启动不了，查看日志，报错如下
[root@localhost opt]# vim /usr/local/redis/redis6379.log
*** FATAL CONFIG FILE ERROR ***
Reading the configuration file, at line 177
>>> 'dbfilename /usr/local/redis/bin/dump-6379.rdb'
dbfilename can't be a path, just a filename
编辑三个实例配置文件，把端口，对应改成非重叠的，为了更好的区分，我就按照
192.168.1.222 “实例A 6379” “实例B 6380” “实例C 6381”
192.168.1.223 “实例D 6382” “实例E 6383” “实例F 6384”
port appendfilename cluster-config-file 注意根据不同实例，修改成不同的值
例如，实例B的配置文件主要是
daemonize yes 修改no为yes，后台运行redis
port 6380
#dbfilename dump-6380.rdb
appendonly yes
appendfilename "appendonly-6380.aof"
logfile "/usr/local/redis/redis6380.log" 日志
cluster-enabled yes
cluster-config-file /usr/local/redis/nodes-6380.conf
cluster-node-timeout 5000
再例如，实例E的配置文件主要变化是
daemonize yes 修改no为yes，后台运行redis
port 6383
#dbfilename dump-6383.rdb
appendonly yes
appendfilename "appendonly-6383.aof"
logfile "/usr/local/redis/redis6383.log" 日志
cluster-enabled yes
cluster-config-file /usr/local/redis/nodes-6383.conf
cluster-node-timeout 5000
启动redis服务
redis-server /etc/redis/6379.conf > /usr/local/redis/redis6379.log 2>&1 &
redis-server /etc/redis/6380.conf > /usr/local/redis/redis6380.log 2>&1 &
redis-server /etc/redis/6381.conf > /usr/local/redis/redis6381.log 2>&1 &
注意，为了方便查看错误信息，我把它日志，重定向到 对应的实例名字，存放在/usr/local/redis/下面
一切如果正常的话，你随便找一个 redis6379.log redis6380.log redis6381.log
例如，我找一个 6380的日志
[root@localhost ]# vim /usr/local/redis/redis6380.log
6115:M 31 Aug 12:34:28.904 * Increased maximum number of open files to 10032 (it was originally set to 1024).
6115:M 31 Aug 12:34:28.906 * No cluster configuration found, I'm 92999f9840418a848f7b10c5bca0119e3b515fa4
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 3.0 (00000000/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in cluster mode
|`-._`-…-` __…-.``-._|'` _.-'| Port: 6380
| `-._ `._ / _.-' | PID: 6115
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
6115:M 31 Aug 12:34:28.924 # Server started, Redis version 3.0
6115:M 31 Aug 12:34:28.924 * The server is now ready to accept connections on port 6380
说明一切准备就绪，都能正常运作，就差集群了，为了更加放心，看一下是否三个实例都在正常运行
[root@localhost ]# ps aux |grep redis
root 6109 0.6 0.9 137408 9740 pts/1 Sl 12:33 0:52 redis-server *:6379
root 6115 0.6 0.9 137408 9912 pts/2 Sl 12:34 0:51 redis-server *:6380
root 6123 0.6 0.7 137408 7876 pts/2 Sl 12:35 0:50 redis-server *:6381
root 6235 0.0 0.0 103240 840 pts/2 S+ 14:47 0:00 grep redis
[root@localhost]#
以上，所有步骤，在192.168.1.223，同样的做法，注意变化的就是 redis 端口的改变，以及对于配置文件名的变化（例如6382.conf，6383.conf，6384.conf等）。
那么，开始集群吧，集群之前，先表示怀疑一下[请注意，只需要在其中一台服务器操作下面内容
[root@localhost ~]# cd redis-3.0.0-beta8
[root@localhost redis-3.0.0-beta8]# cd src/
[root@localhost src]# ./redis-trib.rb create --replicas 1 192.168.1.222:6379 192.168.1.222:6780 192.168.1.222:6381 192.168.1.223:6382 192.168.1.223:6383 192.168.1.223:6384
/usr/bin/env: ruby: No such file or directory
[root@localhost src]#
你会发现，他马上报错，报错信息如下：/usr/bin/env: ruby: No such file or directory
就是说，没有ruby，
因为
redis-trib位于Redis源码的src文件夹中， 它是一个Ruby程序， 这个程序通过向实例发送特殊命令来完成创建新集 群， 检查集群， 或者对集群进行重新分片（reshared）等工作。
既然没有ruby，那我们就yum安装一个吧
yum -y install ruby ruby-rdoc
好，装好了，继续来集群
[root@localhost src]# ./redis-trib.rb create --replicas 1 192.168.1.222:6379 192.168.1.222:6780
192.168.1.222:6381 192.168.1.223:6382 192.168.1.223:6383 192.168.1.223:6384
./redis-trib.rb:24:in `require': no such file to load -- rubygems (LoadError)
from ./redis-trib.rb:24
[root@localhost src]#
你会发现，又有问题了，这是什么问题啊，不过看了一下，后面提示rubygems (LoadError) ，嘿嘿，应该就是gem没有上去，那么装一个咯
gem下载地址，上面有 http://rubygems.org/pages/download/ 有TGZ ZIP GEM GIT, 我这里下载的是zip的包
安装rubygems
unzip rubygems-2.4.2.zip
cd rubygems-2.4.2
ruby setup.rb
刷刷刷一大堆东西出来，不过，细心的朋友，你会发现，下面有一处非常重要的 代码
[root@localhost rubygems-2.4.2]# ruby setup.rb
RubyGems 2.4.2 installed
Installing ri documentation for rubygems-2.4.2
/usr/lib/ruby/1.8/rdoc/rdoc.rb:280: warning: conflicting chdir during another chdir block
/usr/lib/ruby/1.8/rdoc/rdoc.rb:287: warning: conflicting chdir during another chdir block
=== 2.4.2 / 2014-10-01
This release was sponsored by Ruby Central.
Bug fixes:
* RubyGems now correctly matches wildcard no_proxy hosts. Issue #997 by
voelzemo.
* Added support for missing git_source method in the gem dependencies API.
* Fixed handling of git gems with an alternate install directory.
* Lockfiles will no longer be truncated upon resolution errors.
* Fixed messaging for `gem owner -a`. Issue #1004 by Aaron Patterson, Ryan
Davis.
* Removed meaningless ensure. Pull request #1003 by gogotanaka.
* Improved wording of --source option help. Pull request #989 by Jason Clark.
* Empty build_info files are now ignored. Issue #903 by Adan Alvarado.
* Gem::Installer ignores dependency checks when installing development
dependencies. Issue #994 by Jens Willie.
* `gem update` now continues after dependency errors. Issue #993 by aaronchi.
* RubyGems no longer warns about semantic version dependencies for the 0.x
range. Issue #987 by Jeff Felchner, pull request #1006 by Hsing-Hui Hsu.
* Added minimal lock to allow multithread installation of gems. Issue #982
and pull request #1005 by Yorick Peterse
* RubyGems now considers prerelease dependencies as it did in earlier versions
when --prerelease is given. Issue #990 by Jeremy Tryba.
* Updated capitalization in README. Issue #1010 by Ben Bodenmiller.
* Fixed activating gems from a Gemfile for default gems. Issue #991 by khoan.
* Fixed windows stub script generation for Cygwin. Issue #1000 by Brett
DiFrischia.
* Allow gem bindir and ruby.exe to live in separate diretories. Pull request
#942 by Ian Flynn.
* Fixed handling of gemspec in gem dependencies files to match Bundler
behavior. Issue #1020 by Michal Papis.
* Fixed `gem update` when updating to prereleases. Issue #1028 by Santiago
Pastorino.
* RubyGems now fails immediately when a git reference cannot be found instead
of spewing git errors. Issue #1031 by Michal Papis
=== 2.4.1 / 2014-07-17
Bug fixes:
* RubyGems can now be updated on Ruby implementations that do not support
vendordir in RbConfig::CONFIG. Issue #974 by net1957.
=== 2.4.0 / 2014-07-16
Minor enhancements:
* The contents command now supports a --show-install-dir option that shows
only the directory the gem is installed in. Feature request #966 by Akinori
MUSHA.
* Added a --build-root option to the install command for packagers. Pull
request #965 by Marcus R眉ckert.
* Added vendor gem support to RubyGems. Package managers may now install gems
in Gem.vendor_dir with the --vendor option to gem install. Issue #943 by
Marcus R眉ckert.
Bug fixes:
* Kernel#gem now respects the prerelease flag when activating gems.
Previously this behavior was undefined which could lead to bugs when a
prerelease version was unintentionally activated. Bug #938 by Joe Ferris.
* RubyGems now prefers gems from git over installed gems. This allows gems
from git to override an installed gem with the same name and version. Bug
#944 by Thomas Kriechbaumer.
* Fixed handling of git gems in a lockfile with unversioned dependencies. Bug
#940 by Michael Kaiser-Nyman.
* The ruby directive in a gem dependencies file is ignored when installing.
Bug #941 by Michael Kaiser-Nyman.
* Added open to list of builtin commands (`gem open` now works). Reported by
Espen Antonsen.
* `gem open` now works with command-line editors. Pull request #962 by Tim
Pope.
* `gem install -g` now respects `--conservative`. Pull request #950 by Jeremy
Evans.
* RubyGems releases announcements now now include checksums. Bug #939 by
Alexander E. Fischer.
* RubyGems now expands ~ in $PATH when checking if installed executables will
be runnable. Pull request #945 by Alex Talker.
* Fixed `gem install -g --explain`. Issue #947 by Luis Lavena. Patch by
Hsing-Hui Hsu.
* RubyGems locks less during gem activation. Pull request #951 by Aaron
Patterson and Justin Searls, #969 by Jeremy Tryba.
* Kernel#gem is now thread-safe. Pull request #967 by Aaron Patterson.
* RubyGems now handles spaces in directory names for some parts of extension
building. Pull request #949 by Tristan Hill.
* RubyGems no longer defines an empty Date class. Pull Request #948 by Benoit
Daloze.
* RubyGems respects --document options for `gem update` again. Bug 946 by
jonforums. Patch by Hsing-Hui Hsu.
* RubyGems generates documentation again with --ignore-dependencies. Bug #961
by Pulfer.
* RubyGems can install extensions across partitions now. Pull request #970 by
Michael Scherer.
* `-s` is now short for `--source` which resolves an ambiguity with
--no-suggestions. Pull request #955 by Alexander Kahn.
* Added extra test for ~> for 0.0.X versions. Pull request #958 by Mark
Lorenz.
* Fixed typo in gem updated help. Pull request #952 by Per Modin.
* Clarified that the gem description should not be excessively long. Part of
bug #956 by Renier Morales.
* Hid documentation of outdated test_files related methods in Specification.
Guides issue #90 by Emil Soman.
* RubyGems now falls back to the old index if the rubygems.org API fails
during gem resolution.
------------------------------------------------------------------------------
RubyGems installed the following executables:
/usr/bin/gem
Ruby Interactive (ri) documentation was installed. ri is kind of like man
pages for ruby libraries. You may access it like this:
ri Classname
ri Classname.class_method
ri Classname#instance_metho
If you do not wish to install this documentation in the future, use the
--no-document flag, or set it as the default in your ~/.gemrc file. See
'gem help env' for details.
为了方便操作rubygem，我们把它拷贝到系统环境变量当中，方便调用cp bin/gem /usr/local/bin/
接下来， 安装 redis 的api 接口，这就是为什么上面要装rubygem的道理了gem install -l redis-3.0.0.gem
redis-3.0.0.gem 上面讲到，可以到 官网 http://rubygems.org/gems/redis/versions/3.1.0 下载
一切就绪，现在再一次，来执行集群看看还有没有报错的信息
[root@localhost src]# ./redis-trib.rb create --replicas 1 192.168.1.222:6379 192.168.1.222:6380 192.168.1.222:6381 192.168.1.223:6382 192.168.1.223:6383 192.168.1.223:6384
>>> Creating cluster
Connecting to node 192.168.1.222:6379: OK
Connecting to node 192.168.1.222:6380: OK
Connecting to node 192.168.1.222:6381: OK
Connecting to node 192.168.1.223:6382: OK
Connecting to node 192.168.1.223:6383: OK
Connecting to node 192.168.1.223:6384: OK
>>> Performing hash slots allocation on 6 nodes…
Using 3 masters:
192.168.1.223:6382
192.168.1.222:6379
192.168.1.223:6383
Adding replica 192.168.1.222:6380 to 192.168.1.223:6382
Adding replica 192.168.1.223:6384 to 192.168.1.222:6379
Adding replica 192.168.1.222:6381 to 192.168.1.223:6383
M: faa2fab465017c9be2475d0cbd9ffb7b8e8267e6 192.168.1.222:6379
slots:5461-10922 (5462 slots) master
S: 92999f9840418a848f7b10c5bca0119e3b515fa4 192.168.1.222:6380
replicates c13fbd7fadda1e46b133b8f87248414d9a7a0fcc
S: 5d44e7e3bf2c19fcdcc1548feef42d5d9665da0b 192.168.1.222:6381
replicates 7d674df0ab68be0b4c6a461b0c1484b02eeb12c5
M: c13fbd7fadda1e46b133b8f87248414d9a7a0fcc 192.168.1.223:6382
slots:0-5460 (5461 slots) master
M: 7d674df0ab68be0b4c6a461b0c1484b02eeb12c5 192.168.1.223:6383
slots:10923-16383 (5461 slots) master
S: c4b565e9236effee3957c6f03b533dced729e39b 192.168.1.223:6384
replicates faa2fab465017c9be2475d0cbd9ffb7b8e8267e6
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join…
>>> Performing Cluster Check (using node 192.168.1.222:6379)
M: faa2fab465017c9be2475d0cbd9ffb7b8e8267e6 192.168.1.222:6379
slots:5461-10922 (5462 slots) master
M: 92999f9840418a848f7b10c5bca0119e3b515fa4 192.168.1.222:6380
slots: (0 slots) master
replicates c13fbd7fadda1e46b133b8f87248414d9a7a0fcc
M: 5d44e7e3bf2c19fcdcc1548feef42d5d9665da0b 192.168.1.222:6381
slots: (0 slots) master
replicates 7d674df0ab68be0b4c6a461b0c1484b02eeb12c5
M: c13fbd7fadda1e46b133b8f87248414d9a7a0fcc 192.168.1.223:6382
slots:0-5460 (5461 slots) master
M: 7d674df0ab68be0b4c6a461b0c1484b02eeb12c5 192.168.1.223:6383
slots:10923-16383 (5461 slots) master
M: c4b565e9236effee3957c6f03b533dced729e39b 192.168.1.223:6384
slots: (0 slots) master
replicates faa2fab465017c9be2475d0cbd9ffb7b8e8267e6
[OK] All nodes agree about slots configuration.
>>> Check for open slots…
>>> Check slots coverage…
[OK] All 16384 slots covered.
[root@localhost src]#
一切OK。
如果不相信，可以来测试一下集群
[root@localhost src]# ./redis-trib.rb check 192.168.1.223:6384
Connecting to node 192.168.1.223:6384: OK
Connecting to node 192.168.1.222:6380: OK
Connecting to node 192.168.1.222:6379: OK
Connecting to node 192.168.1.222:6381: OK
Connecting to node 192.168.1.223:6383: OK
Connecting to node 192.168.1.223:6382: OK
>>> Performing Cluster Check (using node 192.168.1.223:6384)
S: c4b565e9236effee3957c6f03b533dced729e39b 192.168.1.223:6384
slots: (0 slots) slave
replicates faa2fab465017c9be2475d0cbd9ffb7b8e8267e6
S: 92999f9840418a848f7b10c5bca0119e3b515fa4 192.168.1.222:6380
slots: (0 slots) slave
replicates c13fbd7fadda1e46b133b8f87248414d9a7a0fcc
M: faa2fab465017c9be2475d0cbd9ffb7b8e8267e6 192.168.1.222:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
M: 5d44e7e3bf2c19fcdcc1548feef42d5d9665da0b 192.168.1.222:6381
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 7d674df0ab68be0b4c6a461b0c1484b02eeb12c5 192.168.1.223:6383
slots: (0 slots) slave
replicates 5d44e7e3bf2c19fcdcc1548feef42d5d9665da0b
M: c13fbd7fadda1e46b133b8f87248414d9a7a0fcc 192.168.1.223:6382
slots:0-5460 (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots…
>>> Check slots coverage…
[OK] All 16384 slots covered.
[root@localhost src]#
注意哦，我是直接在192.168.1.222，测试到192.168.1.223当中的6384这个实例了
从上面，我们也不难看出
redis_master 是
192.168.1.222:6379
192.168.1.222:6381
192.168.1.223:6382
redis_salve 是
192.168.1.223:6384
192.168.1.222:6380
192.168.1.223:6383
实验结果
任何一个实例，都能写入，查询，不存在主备关系，redis会自动通过内部算法，选举，不需要你去关心
做一个集群小测试
在 192.168.1.222 ，连接 192.168.1.223 的实例D 6382 ，写入数据 zqtsx
[root@localhost src]# redis-cli -h 192.168.1.223 -p 6382 -c
192.168.1.223:6382> set zqtsx mynameiszqtsx
-> Redirected to slot [11570] located at 192.168.1.223:6383
OK
Redis会自己重定向到 6383 ，也就是 E 当中，换句话说，6382和6382是主备关系，其中6383是6382的 salver 服务器
好，那我们来 192.168.1.223 里面的 6484，也就是 F当中读取 zqtsx的值
[root@localhost opt]# redis-cli -h 192.168.1.223 -p 6384 -c
192.168.1.223:6384> get zqtsx
-> Redirected to slot [11570] located at 192.168.1.223:6383
"mynameiszqtsx"
读取到了，它 会自动映射到 6383 去读取
现在疑问来了，我就把6383干掉，看看是什么样的情况
[root@localhost ]# ps aux |grep redis
root 28922 0.2 0.9 137408 9752 pts/2 Sl 03:30 0:06 redis-server *:6382 [cluster]
root 28928 0.2 0.9 137408 9596 pts/2 Sl 03:31 0:06 redis-server *:6383 [cluster]
root 28932 0.2 0.7 137408 7884 pts/2 Sl 03:32 0:05 redis-server *:6384 [cluster]
root 28973 0.0 0.0 103232 876 pts/2 S+ 04:18 0:00 grep redis
[root@localhost opt]# kill -9 28928
[root@localhost opt]# ps aux |grep redis
root 28922 0.2 0.9 137408 9752 pts/2 Sl 03:30 0:06 redis-server *:6382 [cluster]
root 28932 0.2 0.7 137408 7884 pts/2 Sl 03:32 0:05 redis-server *:6384 [cluster]
root 28975 0.0 0.0 103232 876 pts/2 S+ 04:19 0:00 grep redis
[2]- Killed redis-server /etc/redis/6383.conf > /usr/local/redis/redis6383.log 2>&1
很明显，6383已经被干掉了
[root@localhost src]# redis-cli -h 192.168.1.223 -p 6383 -c
Could not connect to Redis at 192.168.1.223:6383: Connection refused
not connected> get zqtsx
Could not connect to Redis at 192.168.1.223:6383: Connection refused
not connected>
[root@localhost src]# redis-cli -h 192.168.1.223 -p 6384 -c
192.168.1.223:6384> get zqtsx
-> Redirected to slot [11570] located at 192.168.1.222:6381
"mynameiszqtsx"
192.168.1.222:6381>
虽然，在6383，建立不了链接，但是不影响我数据的读取，在6381一样可以获取到zqtsx的key值
phpredis扩展安装
phpredis下载地址：https://github.com/nicolasff/phpredis
unzip phpredis-master.zip
cd phpredis-master
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config
make
make install
vi /usr/local/php/etc/php.ini
加入 extension=redis.so
apache下重启httpd或apache，NGINX下重启php-fpm即可
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