后台启动容器

# 命令 docker run -d 镜像名
[root@localhost ~]# docker run -d centos

#问题：docker ps，发现centos停止了

#常见的坑：docker容器使用后台运行，就必须要有一个前台进程，docker发现没有应用，就会自动停止

#nginx，容器启动后，发现自己没有提供服务，就会立刻停止，就是没有程序了

查看日志命令

命令：docker logs -f -t --tail 显示多少条 容器ID

#自己编写一段shell脚本，输出日志
[root@localhost ~]# docker run -d centos /bin/bash -c "while true;do echo gelaotou;sleep 2;done"

#查看当前容器是否正在运行
[root@localhost ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6a6584c42e03 centos "/bin/bash -c 'while…" 4 seconds ago Up 4 seconds inspiring_sanderson

#显示日志
-tf　　　　　　　　　　　　#显示日志
　　--tail number　　　　#要显示的日志条数
[root@localhost ~]# docker logs -f -t --tail 10 6a6584c42e03

查看容器中进程信息

#命令：docker top 容器ID
[root@localhost ~]# docker top 6a6584c42e03
UID PID PPID C STIME TTY TIME CMD
root 51000 50979 0 18:58 ? 00:00:00 /bin/bash -c while true;do echo gelaotou;sleep 2;done
root 51415 51000 0 19:07 ? 00:00:00 /usr/bin/coreutils --coreutils-prog-shebang=sleep /usr/bin/sleep 2

查看容器元数据

#命令：docker inspect 容器ID

#测试
[root@localhost ~]# docker inspect 6a6584c42e03
[
{
"Id": "6a6584c42e03848a0758154af092f29f9a5fc8aecc0c1141e992777fd6c78ab4",
"Created": "2021-08-25T10:58:55.237518044Z",
"Path": "/bin/bash",
"Args": [
"-c",
"while true;do echo gelaotou;sleep 2;done"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 51000,
"ExitCode": 0,
"Error": "",
"StartedAt": "2021-08-25T10:58:55.562799979Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:300e315adb2f96afe5f0b2780b87f28ae95231fe3bdd1e16b9ba606307728f55",
"ResolvConfPath": "/var/lib/docker/containers/6a6584c42e03848a0758154af092f29f9a5fc8aecc0c1141e992777fd6c78ab4/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/6a6584c42e03848a0758154af092f29f9a5fc8aecc0c1141e992777fd6c78ab4/hostname",
"HostsPath": "/var/lib/docker/containers/6a6584c42e03848a0758154af092f29f9a5fc8aecc0c1141e992777fd6c78ab4/hosts",
"LogPath": "/var/lib/docker/containers/6a6584c42e03848a0758154af092f29f9a5fc8aecc0c1141e992777fd6c78ab4/6a6584c42e03848a0758154af092f29f9a5fc8aecc0c1141e992777fd6c78ab4-json.log",
"Name": "/inspiring_sanderson",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"KernelMemory": 0,
"KernelMemoryTCP": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/ddb28e0803ddb17fddd599156bf2972e622e2b9cf54113749615486fe80591a1-init/diff:/var/lib/docker/overlay2/faab2e64b4dd218161992d5efe5b6e8e44ccf5521803fc5649fb77db73288f1f/diff",
"MergedDir": "/var/lib/docker/overlay2/ddb28e0803ddb17fddd599156bf2972e622e2b9cf54113749615486fe80591a1/merged",
"UpperDir": "/var/lib/docker/overlay2/ddb28e0803ddb17fddd599156bf2972e622e2b9cf54113749615486fe80591a1/diff",
"WorkDir": "/var/lib/docker/overlay2/ddb28e0803ddb17fddd599156bf2972e622e2b9cf54113749615486fe80591a1/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "6a6584c42e03",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/bin/bash",
"-c",
"while true;do echo gelaotou;sleep 2;done"
],
"Image": "centos",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"org.label-schema.build-date": "20201204",
"org.label-schema.license": "GPLv2",
"org.label-schema.name": "CentOS Base Image",
"org.label-schema.schema-version": "1.0",
"org.label-schema.vendor": "CentOS"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "10d59ad59c9be98cc6e612f1bf3e830b0eabf447326c4d2ba51509dac5e22ff5",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/10d59ad59c9b",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "ebe304791568263b91f5c86170880878c2b9d683e5643e8e25604b160d02fd30",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "11632f3244eab18afa1c1339d4298e0c535ed6bff5fc6522f50b11f5f286ee30",
"EndpointID": "ebe304791568263b91f5c86170880878c2b9d683e5643e8e25604b160d02fd30",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:02",
"DriverOpts": null
}
}
}
}
]