Docker篇之后续增删端口

在创建容器时，可以用-p来指定端口映射，但是在start容器的时候，并没有有关添加端口映射的方法，无奈百度一下，实践一下，记录一下。

在/var/lib/docker/containers/下，存在着创建好的容器信息，这些都是我们的容器ID

[root@localhost nginx]# ls /var/lib/docker/containers/
1f7a9dba7e9ab6792f94b689714288b233e8a67f69433d32759e1778e8e160aa  619a15d3bc06c12383dac6d19f739ed57b79c6b7ae8eff4f0ddcfed9c5856348
320559d876596546b00d443569cf82b0520120fe5212f5155c41beff5c96883b  b925118f3b03e224bd97d4a8b28eec06e7f8190688c99acded92df834ed211aa
40b82f229080695467d224a8dabade891246bf1009c14be32896459e1933d798

为了认证这一点，我创建了一个有多个端口映射的新容器

[root@localhost nginx]# docker run -it -d -p10022:22 -p 8004:80 -p 8005:8080 --name centos c5
WARNING: IPv4 forwarding is disabled. Networking will not work.
b925118f3b03e224bd97d4a8b28eec06e7f8190688c99acded92df834ed211aa
[root@localhost nginx]# docker ps
b925118f3b03        c5                  "/bin/bash"              About an hour ago   Up About an hour    0.0.0.0:10022->22/tcp, 0.0.0.0:8004->80/tcp, 0.0.0.0:8005->8080/tcp   centos

b925118f3b03e224bd97d4a8b28eec06e7f8190688c99acded92df834ed211aa为容器ID，我们进入容器文件夹内看看，由于目录名过于长，不便观看，我在后面会删除后半部分，希望大家能理解。

[root@localhost nginx]# cd /var/lib/docker/containers/b925118f3b03e22411aa/
[root@localhost b925118f3b03e2b28eea]# ls
b925118f3b03e224bd97d4a8b28eec06e7f8190688c99acded92df834ed211aa-json.log  
config.v2.json   
hostname  
mounts       
resolv.conf.hash
checkpoints                                                                
hostconfig.json  
hosts     
resolv.conf

其中config.v2.json和hostconfig.json内存储着json格式的信息

[root@localhost b925118f3b03ed211aa]# cat hostconfig.json |grep PortBindings
"PortBindings":{"22/tcp":[{"HostIp":"","HostPort":"10022"}],"80/tcp":[{"HostIp":"","HostPort":"8004"}],"8080/tcp":[{"HostIp":"","HostPort":"8005"}]},
[root@localhost b925118f31aa]# cat config.v2.json |grep ExposedPorts
"ExposedPorts":{"22/tcp":{},"80/tcp":{},"8080/tcp":{}}

这一段里标识这我们进行端口的映射,注意看格式，并注意添加时逗号,隔开

"22/tcp":[{"HostIp":"","HostPort":"10022"}]
"22/tcp":{}

尝试下删除ssh服务的22端口，首先停止容器要修改的容器。

[root@localhost b9251184ed211aa]# docker stop centos

这是删除完的，注意！！万事修改先备份！！

cp hostconfig.json{,.bak} && cp config.v2.json{,.bak}

[root@localhost b925118f3b0ed211aa]# cat hostconfig.json |grep PortBindings
"PortBindings":{"80/tcp":[{"HostIp":"","HostPort":"8004"}],"8080/tcp":[{"HostIp":"","HostPort":"8005"}]}
[root@localhost b925118df834ed211aa]# cat config.v2.json |grep ExposedPorts
"ExposedPorts":{"80/tcp":{},"8080/tcp":{}}

然后重启服务，可以看到之前的22端口映射已经没有了。

[root@localhost b925118f3b03e11aa]# systemctl restart docker
[root@localhost b9254ed211aa]# docker ps
b925118f3b03        c5                  "/bin/bash"         About an hour ago   Up 4 seconds        0.0.0.0:8004->80/tcp, 0.0.0.0:8005->8080/tcp   centos