Docker容器之内网独立IP访问的方法

[root@promote ~]# yum install docker -y

[root@promote ~]# systemctl stop firewalld.service
[root@promote ~]# setenforce 0

[root@promote ~]# systemctl start docker.service 
[root@promote ~]# systemctl enable docker.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
#将docker服务设置为开机启动

[root@promote etc]# docker pull docker.io/nginx
Using default tag: latest
Trying to pull repository docker.io/library/nginx ... 
latest: Pulling from docker.io/library/nginx
be8881be8156: Pull complete 
32d9726baeef: Pull complete 
87e5e6f71297: Pull complete 
Digest: sha256:d85914d547a6c92faa39ce7058bd7529baacab7e0cd4255442b04577c4d1f424
Status: Downloaded newer image for docker.io/nginx:latest

[root@promote etc]# docker network create --subnet=172.20.0.0/24 docker-br0
f900579310b9e692ab5a2593d9845be24166120a9de1c16e3143fa5a9c875f96
#创建一个172.20.0.0网段，网桥的名字命名为docker-br0，这两个根据自己需要来

[root@promote etc]# docker images
REPOSITORY     TAG         IMAGE ID      CREATED       SIZE
docker.io/nginx   latest       c82521676580    2 weeks ago     109 MB
#查看我们下载下来的镜像，下面会用到IMAGE ID
[root@promote etc]# docker run -itd --net docker-br0 --ip 172.20.0.10 --name nginx c82521676580 /bin/bash
a2da3616efd0c53745fd7b33823733598be749c83cd4a84f72025664837b3a77
#i表示保持容器打开，t表示给docker分配一个伪终端，d表示以daemon守护进程的方式开启
#--net指定网桥名称，--ip指定启动ip ，--name指定服务名称
[root@promote etc]# docker ps -a
CONTAINER ID    IMAGE        COMMAND       CREATED       STATUS       PORTS        NAMES
a2da3616efd0    c82521676580    "/bin/bash"     4 minutes ago    Up 4 minutes    80/tcp       nginx
#可以看到服务已经启动

[root@promote etc]# docker exec -it nginx /bin/bash
#nginx就是上面指定的name

root@a2da3616efd0:/# ifconfig
bash: ifconfig: command not found
#可以看到并没有这个命令，所以我们需要安装net-tools工具

root@a2da3616efd0:/# apt-get update
#update 是更新 /etc/apt/sources.list 和 /etc/apt/sources.list.d列出的源地址，获取最新软件包信息。
Get:1 http://security.debian.org/debian-security stretch/updates InRelease [94.3 kB] 
Get:3 http://security.debian.org/debian-security stretch/updates/main amd64 Packages [386 kB]
Ign:2 http://cdn-fastly.deb.debian.org/debian stretch InRelease             
Get:4 http://cdn-fastly.deb.debian.org/debian stretch-updates InRelease [91.0 kB]
Get:5 http://cdn-fastly.deb.debian.org/debian stretch Release [118 kB]
Get:6 http://cdn-fastly.deb.debian.org/debian stretch-updates/main amd64 Packages [5148 B]
Get:7 http://cdn-fastly.deb.debian.org/debian stretch Release.gpg [2434 B]
Get:8 http://cdn-fastly.deb.debian.org/debian stretch/main amd64 Packages [7099 kB]
Fetched 7796 kB in 1min 50s (70.8 kB/s)                         
Reading package lists... Done

root@a2da3616efd0:/proc# apt-get upgrade
#升级已经安装的软件包即update中的
Reading package lists... Done
Building dependency tree    
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

root@a2da3616efd0:/proc# apt-get install net-tools 
#安装net-tools软件包
Reading package lists... Done
Building dependency tree    
Reading state information... Done
The following NEW packages will be installed:
 net-tools
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Setting up net-tools (1.60+git20161116.90da8a0-1) ...

root@a2da3616efd0:~# nginx
root@a2da3616efd0:~# netstat -ntap
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address      Foreign Address     State    PID/Program name  
tcp    0   0 0.0.0.0:80       0.0.0.0:*        LISTEN   232/nginx: master p 
tcp    0   0 127.0.0.11:42541    0.0.0.0:*        LISTEN   - 
#nginx服务已经开启，系统80端口也已经打开。