docker (centOS 7) 使用笔记3 - 修改docker默认的虚拟网址

近日在使用VPN时发现和docker的虚拟网址发生了冲突，都是172.17.0.1，故需要修改docker的默认网址。

1. 当前状态

# ifconfig
docker0: flags=<UP,BROADCAST,MULTICAST>  mtu
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
        ether :::::cd  txqueuelen   (Ethernet)
        RX packets   bytes  (0.0 B)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (0.0 B)
        TX errors   dropped  overruns   carrier   collisions 

2. 安装bridge网络工具

yum -y install bridge-utils

安装后，查看网桥列表

# brctl show
bridge name    bridge id        STP enabled    interfaces
docker0        .0242182259cd    no        

3. 停止、删除网桥docker0

停止：

ip link set dev docker0 down

删除：

brctl delbr docker0

删除成功后，查看：

# brctl show
bridge name    bridge id        STP enabled    interfaces

4. 创建新的网桥

# brctl addbr bridge0

5. 设置网桥IP

ip addr add 192.168.0.1/ dev bridge0

6. 启动网桥

ip link set dev bridge0 up

启动成功后，查看：

# brctl show
bridge name    bridge id        STP enabled    interfaces
bridge0        8000.000000000000    no        

# ifconfig
bridge0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu
        inet 192.168.0.1  netmask 255.255.255.0  broadcast 0.0.0.0
        ether ca:ed:3e::f1:ee  txqueuelen   (Ethernet)
        RX packets   bytes  (0.0 B)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (0.0 B)
        TX errors   dropped  overruns   carrier   collisions 

7.修改docker启动设置

/etc/systemd/system/multi-user.target.wants/docker.service

ExecStart=/usr/bin/dockerd -b bridge0

添加选项 -b bridge0

8. 重启docker服务

systemctl daemon-reload
systemctl restart docker