在Docker中运行web应用
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：
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[*]# 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并在后台运行
-P 映射一个网络端口
training/webapp docker社区提供的，预先创建好的模板，里面包含一个简单的Python Flask web应用
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[*]# 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 查看详细信息
PORTS显示 0.0.0.0:49153->5000/tcp
意思是将Container中的5000端口，映射到host的49153端口。5000是Python Flask 的默认端口。
也可以使用 -p container-port:host-port 命令来指定映射端口号
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[*]# 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，5000端口的映射信息
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[*]# docker port hopeful_lalande 5000
[*]0.0.0.0:49153
查看web应用日志
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[*]# docker logs -f hopeful_lalande
[*] * Running on http://0.0.0.0:5000/
[*]192.168.254.1 - - "GET / HTTP/1.1" 200 -
[*]192.168.254.1 - - "GET /favicon.ico HTTP/1.1" 404 -
[*]192.168.254.1 - - "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
查看进程详细信息
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[*]# 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应用容器详细信息
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[*]# 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。
也可以通过指定名称，获取某项信息值，如下：
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[*]# docker inspect -f '{{ .NetworkSettings.IPAddress }}' hopeful_lalande
[*]172.17.0.8
停止Web应用
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[*]# docker stop hopeful_lalande
[*]hopeful_lalande
停止后，可以使用docker ps -a命令，列出之前所有docker容器
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[*]# 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
[*]。。。
重启Web应用
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[*]# docker start hopeful_lalande
[*]hopeful_lalande
删除Web应用
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[*]# 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运行的container。
停止该container后，重新执行上条命令，成功删除container
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