启动一个简单的web 应用
使用社区提供的模板，启动一个简单的web应用，熟悉下各种Docker命令的使用：
# docker run -d -P training/webapp python app.py Unable to find image 'training/webapp' locally Pulling repository training/webapp 31fa814ba25a: Download complete 511136ea3c5a: Download complete f10ebce2c0e1: Download complete 82cdea7ab5b5: Download complete 5dbd9cb5a02f: Download complete 74fe38d11401: Download complete 64523f641a05: Download complete 0e2afc9aad6e: Download complete e8fc7643ceb1: Download complete 733b0e3dbcee: Download complete a1feb043c441: Download complete e12923494f6a: Download complete a15f98c46748: Download complete Status: Downloaded newer image for training/webapp:latest d00f94a31e8767271f68ab72eab15a8e805c416b0636877f22a31572d10b718d
-d 启动一个daemon并在后台执行
-P 映射一个网络port
training/webapp docker社区提供的。预先创建好的模板。里面包括一个简单的Python Flask web应用
# docker ps -l CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d00f94a31e87 training/webapp:latest "python app.py" 59 seconds ago Up 56 seconds 0.0.0.0:49153->5000/tcp hopeful_lalande
-l 查看具体信息
PORTS显示 0.0.0.0:49153->5000/tcp
意思是将container中的5000port。映射到host的49153port。5000是Python Flask 的默认port。
也能够使用 -p container-port:host-port 命令来指定映射端口号
# docker run -d -p 5000:5000 training/webapp python app.py
查看web应用信息
查看名为hopeful_lalande的docker container中，5000port的映射信息
# docker port hopeful_lalande 5000 0.0.0.0:49153
查看web应用日志
# docker logs -f hopeful_lalande * Running on http://0.0.0.0:5000/ 192.168.254.1 - - [17/Dec/2014 02:30:32] "GET / HTTP/1.1" 200 - 192.168.254.1 - - [17/Dec/2014 02:30:32] "GET /favicon.ico HTTP/1.1" 404 - 192.168.254.1 - - [17/Dec/2014 02:30:32] "GET /favicon.ico HTTP/1.1" 404 -
-f 持续查看container日志的标准化输出，类似tail -f
查看进程具体信息
# docker top hopeful_lalande UID PID PPID C STIME TTY TIME CMD root 15189 2447 0 10:24 ? 00:00:00 python app.py
查看web应用容器具体信息
# docker inspect hopeful_lalande
[{
"AppArmorProfile": "",
"Args": [
"app.py"
],
"Config": {
"AttachStderr": false,
"AttachStdin": false,
"AttachStdout": false,
"Cmd": [
"python",
"app.py"
],
"CpuShares": 0,
"Cpuset": "",
"Domainname": "",
"Entrypoint": null,
"Env": [
"HOME=/",
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"ExposedPorts": {
"5000/tcp": {}
},
"Hostname": "d00f94a31e87",
"Image": "training/webapp",
"Memory": 0,
"MemorySwap": 0,
"NetworkDisabled": false,
"OnBuild": null,
"OpenStdin": false,
"PortSpecs": null,
"StdinOnce": false,
"Tty": false,
"User": "",
"Volumes": null,
"WorkingDir": "/opt/webapp"
},
"Created": "2014-12-17T02:24:09.468631143Z",
"Driver": "devicemapper",
"ExecDriver": "native-0.2",
"HostConfig": {
"Binds": null,
"CapAdd": null,
"CapDrop": null,
"ContainerIDFile": "",
"Devices": [],
"Dns": null,
"DnsSearch": null,
"ExtraHosts": null,
"Links": null,
"LxcConf": [],
"NetworkMode": "bridge",
"PortBindings": {},
"Privileged": false,
"PublishAllPorts": true,
"RestartPolicy": {
"MaximumRetryCount": 0,
"Name": ""
},
"SecurityOpt": null,
"VolumesFrom": null
},
"HostnamePath": "/var/lib/docker/containers/d00f94a31e8767271f68ab72eab15a8e805c416b0636877f22a31572d10b718d/hostname",
"HostsPath": "/var/lib/docker/containers/d00f94a31e8767271f68ab72eab15a8e805c416b0636877f22a31572d10b718d/hosts",
"Id": "d00f94a31e8767271f68ab72eab15a8e805c416b0636877f22a31572d10b718d",
"Image": "31fa814ba25ae3426f8710df7a48d567d4022527ef2c14964bb8bc45e653417c",
"MountLabel": "",
"Name": "/hopeful_lalande",
"NetworkSettings": {
"Bridge": "docker0",
"Gateway": "172.17.42.1",
"IPAddress": "172.17.0.8",
"IPPrefixLen": 16,
"MacAddress": "02:42:ac:11:00:08",
"PortMapping": null,
"Ports": {
"5000/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "49153"
}
]
}
},
"Path": "python",
"ProcessLabel": "",
"ResolvConfPath": "/var/lib/docker/containers/d00f94a31e8767271f68ab72eab15a8e805c416b0636877f22a31572d10b718d/resolv.conf",
"State": {
"ExitCode": 0,
"FinishedAt": "0001-01-01T00:00:00Z",
"Paused": false,
"Pid": 15189,
"Restarting": false,
"Running": true,
"StartedAt": "2014-12-17T02:24:11.279426855Z"
},
"Volumes": {},
"VolumesRW": {}
}
]
输出一个JSON格式的Docker container配置和状态。
也能够通过指定名称，获取某项信息值。例如以下：
# docker inspect -f '{{ .NetworkSettings.IPAddress }}' hopeful_lalande
172.17.0.8
停止Web应用
# docker stop hopeful_lalande hopeful_lalande
停止后，能够使用docker ps -a命令，列出之前全部docker容器
# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d00f94a31e87 training/webapp:latest "python app.py" 21 minutes ago Exited (-1) 43 seconds ago hopeful_lalande 7f22b335fb2c fedora:latest "/bin/sh -c 'while t 49 minutes ago Exited (-1) 40 minutes ago silly_archimedes 。。。
重新启动Web应用
# docker start hopeful_lalande hopeful_lalande
删除Web应用
# docker rm hopeful_lalande Error response from daemon: You cannot remove a running container. Stop the container before attempting removal or use -f 2014/12/17 10:49:32 Error: failed to remove one or more containers
提示无法删除一个正在执行的container。
停止该container后，又一次运行上条命令。成功删除container