Docker修改已有容器的端口映射

Docker修改已有容器的端口映射

背景

• 拉取了jenkins的镜像，启动容器的时候端口就映射了8080，但这个演示环境要用到jenkins node，其中默认的代理端口是50000.漏了，就想着能否不重新弄一个容器，修改下配置或者命令行增加下port映射即可。

实践

• 当前端口

   # 启动命令
   docker run -id --name=sqjenkins -p 8083:8080 -v /var/jenkins_node:/var/jenkins_home --restart=always jenkins/jenkins
   ​
   # 查看当前容器
   [root@hecs-67651 var]# docker ps -a
   CONTAINER ID   IMAGE             COMMAND                  CREATED       STATUS             PORTS                                                  NAMES
   4a190f585202   jenkins/jenkins   "/usr/bin/tini -- /u…"   2 hours ago   Up About an hour   50000/tcp, 0.0.0.0:8083->8080/tcp, :::8083->8080/tcp   sqjenkins
   ​
   ​
   # 端口映射
   ​
   [root@hecs-67651 var]# docker port 4a19
   8080/tcp -> 0.0.0.0:8083
   8080/tcp -> :::8083
   ​
   ​

• 获取容器完整的id

   [root@hecs-67651 var]# docker inspect 4a19|grep Id
           "Id": "4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03",
   ​

• 在/var/lib/docker/containers下找到这个目录

   cd /var/lib/docker/containers/4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03

• 停止容器

   [root@hecs-67651 ~]# docker stop 4a
   4a

• 确认有个json文件

  • 文件

     [root@hecs-67651 4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03]# ls -l
     total 164
     -rw-r----- 1 root root 126317 Aug 10 14:45 4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03-json.log
     drwx------ 2 root root   4096 Aug 10 12:29 checkpoints
     -rw------- 1 root root   4107 Aug 10 14:44 config.v2.json
     -rw-r--r-- 1 root root   1602 Aug 10 14:44 hostconfig.json
     -rw-r--r-- 1 root root     13 Aug 10 14:44 hostname
     -rw-r--r-- 1 root root    174 Aug 10 14:44 hosts
     drwx--x--- 2 root root   4096 Aug 10 12:29 mounts
     -rw-r--r-- 1 root root    143 Aug 10 14:44 resolv.conf
     -rw-r--r-- 1 root root     71 Aug 10 14:44 resolv.conf.hash

  • hostconfig.json 示例（已美化过）

     {
         "Binds": ["/var/jenkins_node:/var/jenkins_home"],
         "ContainerIDFile": "",
         "LogConfig": {
             "Type": "json-file",
             "Config": {}
         },
         "NetworkMode": "default",
         "PortBindings": {
             "8080/tcp": [{
                 "HostIp": "",
                 "HostPort": "8083"
             }]
         },
         "RestartPolicy": {
             "Name": "always",
             "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"]
     }

    • 最好备份下这2个json文件

    • 修改前的内容

       "PortBindings":{"8080/tcp":[{"HostIp":"","HostPort":"8083"}]}

    • 修改后的内容

       "PortBindings":{"50000/tcp":[{"HostIp":"","HostPort":"50000"}],"8080/tcp":[{"HostIp":"","HostPort":"8083"}]},

  • config.v2.json 示例（已美化过），此处并不需要修改（看里面已经有）

     {
         "StreamConfig": {},
         "State": {
             "Running": false,
             "Paused": false,
             "Restarting": false,
             "OOMKilled": false,
             "RemovalInProgress": false,
             "Dead": false,
             "Pid": 0,
             "ExitCode": 143,
             "Error": "",
             "StartedAt": "2022-08-10T04:52:46.192830223Z",
             "FinishedAt": "2022-08-10T06:37:16.759288228Z",
             "Health": null
         },
         "ID": "4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03",
         "Created": "2022-08-10T04:29:21.506586162Z",
         "Managed": false,
         "Path": "/usr/bin/tini",
         "Args": ["--", "/usr/local/bin/jenkins.sh"],
         "Config": {
             "Hostname": "4a190f585202",
             "Domainname": "",
             "User": "jenkins",
             "AttachStdin": false,
             "AttachStdout": false,
             "AttachStderr": false,
             "ExposedPorts": {    //注意此处已经在容器中暴露了端口，所以无需增加
                 "50000/tcp": {},
                 "8080/tcp": {}
             },
             "Tty": false,
             "OpenStdin": true,
             "StdinOnce": false,
             "Env": ["PATH=/opt/java/openjdk/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "LANG=C.UTF-8", "JENKINS_HOME=/var/jenkins_home", "JENKINS_SLAVE_AGENT_PORT=50000", "REF=/usr/share/jenkins/ref", "JENKINS_VERSION=2.363", "JENKINS_UC=https://updates.jenkins.io", "JENKINS_UC_EXPERIMENTAL=https://updates.jenkins.io/experimental", "JENKINS_INCREMENTALS_REPO_MIRROR=https://repo.jenkins-ci.org/incrementals", "COPY_REFERENCE_FILE_LOG=/var/jenkins_home/copy_reference_file.log", "JAVA_HOME=/opt/java/openjdk"],
             "Cmd": null,
             "Image": "jenkins/jenkins",
             "Volumes": {
                 "/var/jenkins_home": {}
             },
             "WorkingDir": "",
             "Entrypoint": ["/usr/bin/tini", "--", "/usr/local/bin/jenkins.sh"],
             "OnBuild": null,
             "Labels": {
                 "org.opencontainers.image.description": "The Jenkins Continuous Integration and Delivery server",
                 "org.opencontainers.image.licenses": "MIT",
                 "org.opencontainers.image.revision": "e6e7014de2cfb18b89672fd814b5702e68d2878b",
                 "org.opencontainers.image.source": "https://github.com/jenkinsci/docker",
                 "org.opencontainers.image.title": "Official Jenkins Docker image",
                 "org.opencontainers.image.url": "https://www.jenkins.io/",
                 "org.opencontainers.image.vendor": "Jenkins project",
                 "org.opencontainers.image.version": "2.363"
             }
         },
         "Image": "sha256:90ff7cc5bfd1e19083a61cf97d7b4eca2f0c1f0d45acaf3e8f42a33bfc08b3b0",
         "NetworkSettings": {
             "Bridge": "",
             "SandboxID": "44ea05ba1ad2f7a4e8f5c00173962eba594d47607528e6a035a3b4410b5f123c",
             "HairpinMode": false,
             "LinkLocalIPv6Address": "",
             "LinkLocalIPv6PrefixLen": 0,
             "Networks": {
                 "bridge": {
                     "IPAMConfig": null,
                     "Links": null,
                     "Aliases": null,
                     "NetworkID": "3bd08324422f563ead4b5e4160d8d5b4a450f8f67890bbf3472817058dc1d18b",
                     "EndpointID": "",
                     "Gateway": "",
                     "IPAddress": "",
                     "IPPrefixLen": 0,
                     "IPv6Gateway": "",
                     "GlobalIPv6Address": "",
                     "GlobalIPv6PrefixLen": 0,
                     "MacAddress": "",
                     "DriverOpts": null,
                     "IPAMOperational": false
                 }
             },
             "Service": null,
             "Ports": null,
             "SandboxKey": "/var/run/docker/netns/44ea05ba1ad2",
             "SecondaryIPAddresses": null,
             "SecondaryIPv6Addresses": null,
             "IsAnonymousEndpoint": false,
             "HasSwarmEndpoint": false
         },
         "LogPath": "/var/lib/docker/containers/4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03/4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03-json.log",
         "Name": "/sqjenkins",
         "Driver": "overlay2",
         "OS": "linux",
         "MountLabel": "",
         "ProcessLabel": "",
         "RestartCount": 0,
         "HasBeenStartedBefore": true,
         "HasBeenManuallyStopped": true,
         "MountPoints": {
             "/var/jenkins_home": {
                 "Source": "/var/jenkins_node",
                 "Destination": "/var/jenkins_home",
     "RW": true, 
    "Name": "", 
    "Driver": "", 
    "Type": "bind", 
    "Propagation": "rprivate", 
    "Spec": { 
    "Type": "bind", 
    "Source": "/var/jenkins_node", 
    "Target": "/var/jenkins_home" 
        }, 
    "SkipMountpointCreation": false 
        } 
        }, 
    "SecretReferences": null, 
    "ConfigReferences": null, 
    "AppArmorProfile": "", 
    "HostnamePath": "/var/lib/docker/containers/4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03/hostname", 
    "HostsPath": "/var/lib/docker/containers/4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03/hosts", 
    "ShmPath": "", 
    "ResolvConfPath": "/var/lib/docker/containers/4a190f5852024ebf6ba6bbd1dd18dca89203a203282d98b3f2885af486cc9a03/resolv.conf", 
    "SeccompProfile": "", 
    "NoNewPrivileges": false, 
    "LocalLogCacheMeta": { 
    "HaveNotifyEnabled": false 
        } 
    }

• 修改完毕（容器是停止状态），你需要重启docker（如果你有其他的容器就比较麻烦），我试过重启容器，始终无效。

   systemctl restart docker

• 再次查看端口映射发现已经增加了

   ​
   [root@hecs-67651 ~]# docker port 4a
   50000/tcp -> 0.0.0.0:50000
   50000/tcp -> :::50000
   8080/tcp -> 0.0.0.0:8083
   8080/tcp -> :::8083
   ​

总结

• 要重启docker本身

• config.v2.json hostconfig.json两个文件的内容

• 修改的时候要注意格式

•