Detailed Explanation of Two way Connection of docker Network

View the docker network

docker network ls

[root@master ~]# docker network ls
NETWORK ID     NAME        DRIVER       SCOPE
e9ecd3b9be87    bridge       bridge       local
45336895a3a4    host        host        local
6a44e8330adb    none        null        local

Create a bridge

docker network create bridge my-bridge

[root@master ~]# docker network create -d bridge my-bridge
0ae59991f86c3276acfc5a78dd316f47c124f093e60ce719046f1045ccccb1bd
[root@master ~]# docker network ls
NETWORK ID     NAME        DRIVER       SCOPE
e9ecd3b9be87    bridge       bridge       local
45336895a3a4    host        host        local
0ae59991f86c    my-bridge      bridge       local
6a44e8330adb    none        null        local

Add two containers to this bridge

docker network connect my-bridge centos-test-1
docker network connect my-bridge centos-test-2

[root@master ~]# docker network connect my-bridge centos-test-1
[root@master ~]# docker network connect my-bridge centos-test-2

Containers can communicate with each other by container name

[root@master ~]# docker exec -it centos-test-1 bash
[root@bd4aa8b35c8d /]# ping centos-test-2
PING centos-test-2 (172.18.0.3) 56(84) bytes of data.
64 bytes from centos-test-2.my-bridge (172.18.0.3): icmp_seq=1 ttl=64 time=0.131 ms
64 bytes from centos-test-2.my-bridge (172.18.0.3): icmp_seq=2 ttl=64 time=0.163 ms
^C
--- centos-test-2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.131/0.147/0.163/0.016 ms

[root@master ~]# docker exec -it centos-test-2 bash
[root@d8eac6105db2 /]# ping centos-test-1
PING centos-test-1 (172.18.0.2) 56(84) bytes of data.
64 bytes from centos-test-1.my-bridge (172.18.0.2): icmp_seq=1 ttl=64 time=0.187 ms
64 bytes from centos-test-1.my-bridge (172.18.0.2): icmp_seq=2 ttl=64 time=0.405 ms
64 bytes from centos-test-1.my-bridge (172.18.0.2): icmp_seq=3 ttl=64 time=0.150 ms
^C
--- centos-test-1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 4ms
rtt min/avg/max/mdev = 0.150/0.247/0.405/0.113 ms

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