docker报错：报错br-xxxx 之Docker-Compose 自动创建的网桥与局域网络冲突

故障描述：

当我使用docker-compose的方式部署内网的harbor时。它自动创建了一个bridge网桥，与内网的一个网段(172.18.0.1/16)发生冲突，docker 默认的网络模式是bridge ,默认网段是172.17.0.1/16。

多次执行docker-compose up -d 部署服务后，自动生成的网桥会依次使用： 172.18.x.x ,172.19.x.x....

然后碰巧内网的一个网段也是172.18.x.x。这样就导致这台机器死活也连不到172.18.x.x这台机器。

现象：

telnet不通，也无法ping通。。

解决方法

1、查看路由表：

2、查看docker network如下：

3、将docker-compose应用停止

docker-compose down

4、修改docker.json文件

下次docker启动的时候docker0将会变为172.31.0.1/24，docker-compose自动创建的bridge也会变为172.31.x.x/24

# cat /etc/docker/daemon.json
{
  "debug" : true,
  "default-address-pools" : [
    {
      "base" : "172.31.0.0/16",
      "size" : 24
    }
  ]
}

5、删除原来有冲突的bridge

# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
e4c5724969c9        bridge              bridge              local
b3cd674d3894        harbor_harbor       bridge              local
7f20b3d56275        host                host                local
7b5f3000115b        none                null                local

# docker network rm b3cd674d3894
b3cd674d3894

6、重启docker服务

# systemctl restart docker

7、查看ip a和路由表

# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:a3:f4:69 brd ff:ff:ff:ff:ff:ff
    inet 10.18.61.80/24 brd 10.18.61.255 scope global eth0
       valid_lft forever preferred_lft forever
64: br-6a82e7536981: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:4f:5a:cc:53 brd ff:ff:ff:ff:ff:ff
    inet 172.31.1.1/24 brd 172.31.1.255 scope global br-6a82e7536981
       valid_lft forever preferred_lft forever
65: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:91:20:87:bd brd ff:ff:ff:ff:ff:ff
    inet 172.31.0.1/24 brd 172.31.0.255 scope global docker0
       valid_lft forever preferred_lft forever

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.18.61.1      0.0.0.0         UG    0      0        0 eth0
10.18.61.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.31.0.0      0.0.0.0         255.255.255.0   U     0      0        0 docker0
172.31.1.0      0.0.0.0         255.255.255.0   U     0      0        0 br-6a82e7536981

# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
27b40217b79c        bridge              bridge              local
6a82e7536981        harbor_harbor       bridge              local
7f20b3d56275        host                host                local
7b5f3000115b        none                null                local

可以看到64: br-6a82e7536981 和 65: docker0的网段都已经变成172.31.x.x了。说明配置ok了

8、启动docker-compose

# docker-compose up -d

如果出现以下错误

Starting log         ... error
Starting registry    ... error
Starting registryctl ... error
Starting postgresql  ... error
Starting portal      ... error
Starting redis       ... error
Starting core        ... error
Starting jobservice  ... error
Starting proxy       ... error

ERROR: for log  Cannot start service log: network b3cd674d38943c91c439ea8eafc0ecc4cea6d4e0df875d930e8342f6d678d135 not found
ERROR: No containers to start

因为没有自动切换。NETWORK ID：b3cd674d3....还是原来的NETWORK ID

需要绑定bridge

# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
27b40217b79c        bridge              bridge              local
6a82e7536981        harbor_harbor       bridge              local
7f20b3d56275        host                host                local
7b5f3000115b        none                null                local
# docker network connect network_name container_name
[root@mvxl74019 harbor]# docker network connect harbor_harbor nginx
[root@mvxl74019 harbor]# docker network connect harbor_harbor harbor-jobservice
[root@mvxl74019 harbor]# docker network connect harbor_harbor harbor-core
[root@mvxl74019 harbor]# docker network connect harbor_harbor registryctl
[root@mvxl74019 harbor]# docker network connect harbor_harbor registry
[root@mvxl74019 harbor]# docker network connect harbor_harbor redis
[root@mvxl74019 harbor]# docker network connect harbor_harbor harbor-db
[root@mvxl74019 harbor]# docker network connect harbor_harbor harbor-portal
[root@mvxl74019 harbor]# docker network connect harbor_harbor harbor-log
[root@mvxl74019 harbor]# docker-compose up -d
Starting log         ... done
Starting registry    ... done
Starting registryctl ... done
Starting postgresql  ... done
Starting portal      ... done
Starting redis       ... done
Starting core        ... done
Starting jobservice  ... done
Starting proxy       ... done

9、检查服务是否正常

# docker-compose ps
      Name                     Command                  State                 Ports
---------------------------------------------------------------------------------------------
harbor-core         /harbor/entrypoint.sh            Up (healthy)
harbor-db           /docker-entrypoint.sh            Up (healthy)
harbor-jobservice   /harbor/entrypoint.sh            Up (healthy)
harbor-log          /bin/sh -c /usr/local/bin/ ...   Up (healthy)   127.0.0.1:1514->10514/tcp
harbor-portal       nginx -g daemon off;             Up (healthy)
nginx               nginx -g daemon off;             Up (healthy)   0.0.0.0:80->8080/tcp
redis               redis-server /etc/redis.conf     Up (healthy)
registry            /home/harbor/entrypoint.sh       Up (healthy)
registryctl         /home/harbor/start.sh            Up (healthy)

10、再尝试是否能telnet通目标IP: 172.18.5.145

可以看到是已经能够telnet通和ping通了。

 说明：此文档参考转载至：https://zhuanlan.zhihu.com/p/379305319，仅用于学习使用