docker (centOS 7) 使用笔记3

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=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
        ether 02:42:18:22:59:cd  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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        8000.0242182259cd    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 192.168.0.1/24 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=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.1  netmask 255.255.255.0  broadcast 0.0.0.0
        ether ca:ed:3e:52:f1:ee  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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