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修改或添加映射端口(修改镜像配置)

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前言

由于一些原因，导致自己开启的端口后面需要用到，所以必须要切换端口映射

image-20220917190839148

上面可以看到MySQL的端口是3306，我们将会在后面对它改一下，再加上我们之间没有对容器镜像的配置文件进行操作。

下面是修改配置文件 — 修改MySQL的端口映射过程

停止镜像

root@ubuntu:/c# docker stop 846fec372f81
846fec372f81

停止docker服务

root@ubuntu:/c# systemctl stop docker
Warning: Stopping docker.service, but it can still be activated by:
  docker.socket

进入docker容器内部文件目录

id是容器id开头的那一长串。我的是Ubuntu系统

root@ubuntu:/var/lib/docker/containers# pwd
/var/lib/docker/containers

image-20220917191657815

查找位置，进去

image-20220917191755516

备份原有文件，出现问题后可以还原回去。

cp hostconfig.json hostconfig-bak.json

cp config.v2.json config-bak.v2.json

image-20220917191926113

修改hostconfig.json

vim hostconfig.json

修改成想要的端口（可以用?或者/搜索）

这个文件需要了解下配置

如果之前没有端口映射, 应该有这样的一段:

“PortBindings”:{}

增加一个映射, 这样写:

“PortBindings”:{“8888/tcp”:[{“HostIp”:””,“HostPort”:“1888”}]}

**前一个数字是容器端口, 后一个是宿主机端口。**将宿主机的1888端口映射到容器的8888端口 如果增加多个，就是将宿主机的1888和1006端口映射到容器的8888和6006端口

“PortBindings”:{“8888/tcp”:[{“HostIp”:””,“HostPort”:“1888”}]，“6006/tcp”:[{“HostIp”:””,“HostPort”:“1006”}]}

而修改现有端口映射更简单, 把端口号改掉就行 如果config.v2.json里面也记录了端口，也需要修改config.v2.json

下面就是配置文件，看不清没关系，因为我也看不清img

ostconfig.json
{"Binds":["/mysql/log:/var/log/mysql","/mysql/data:/var/lib/mysql","/mysql/conf:/etc/mysql/conf.d"],"ContainerIDFile":"","LogConfig":{"Type":"json-file","Config":{}},"NetworkMode":"default","PortBindings":{"3306/tcp":[{"HostIp":"","HostPort":"3307"}]},"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":true,"PublishAllPorts":false,"ReadonlyRootfs":false,"SecurityOpt":["label=disable"],"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":null,"ReadonlyPaths":null}

修改config.v2.json

vim config.v2.json

在下面合适的位置，填写端口信息。

"Ports":{"443/tcp":[{"HostIp":"0.0.0.0","HostPort":"443"}],"80/tcp":[{"HostIp":"0.0.0.0","HostPort":"80"}]}

启动docker服务

systemctl start docker

启动docker容器

 docker start 1f2f202dab24

image-20220917193830270

需要注意的是，docker修改完映射端口后，docker的ip可能会发生变化。

docker开启多个端口

我在网上找资料的时候，发现docker可以开启多个端口，也是改配置文件多加一行的是主机对应的端口

或者启动的时候映射多个端口

 docker run -d -p 5000:23 -p 5001:22 --name telnet_ssh --privileged=true telnet:centos /usr/sbin/init

规范写法：

docker run --name definedName(自定义容器名称) \
-p 8080:8080(端口映射  本机端口: docker端口 ) \
-p 8081:8081 \
-p .... \
-d imagesName(镜像名称)