How to access different docker containers

Access method between different containers in docker:

Virtual ip access

When installing docker, docker will create an internal bridge network docker0 by default , each container created is assigned a virtual network card, and containers can access each other based on IP.

[root@33fcf82ab4dd /]# [root@CentOS ~]# ifconfig
......
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
        inet6 fe80::42:35ff:feac:66d8  prefixlen 64  scopeid 0x20<link>
        ether 02:42:35:ac:66:d8  txqueuelen 0  (Ethernet)
        RX packets 4018  bytes 266467 (260.2 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4226  bytes 33935667 (32.3 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
......

Run a centos image, check the ip address and get: 172.17.0.7

[root@CentOS ~]# docker run -it --name centos-1 docker.io/centos:latest
[root@6d214ff8d70a /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.0.7  netmask 255.255.0.0  broadcast 0.0.0.0
        inet6 fe80::42:acff:fe11:7  prefixlen 64  scopeid 0x20<link>
        ether 02:42:ac:11:00:07  txqueuelen 0  (Ethernet)
        RX packets 16  bytes 1296 (1.2 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 8  bytes 648 (648.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Use the same command to start another container, check the ip address and get: 172.17.0.8

[root@CentOS ~]# docker run -it --name centos-2 docker.io/centos:latest
[root@33fcf82ab4dd /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.0.8  netmask 255.255.0.0  broadcast 0.0.0.0
        inet6 fe80::42:acff:fe11:8  prefixlen 64  scopeid 0x20<link>
        ether 02:42:ac:11:00:08  txqueuelen 0  (Ethernet)
        RX packets 8  bytes 648 (648.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 8  bytes 648 (648.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

The results of the ping test inside the container are as follows:

[root@33fcf82ab4dd /]# ping 172.17.0.7
PING 172.17.0.7 (172.17.0.7) 56(84) bytes of data.
bytes from 172.17.0.7: icmp_seq=1 ttl=64 time=0.205 ms
bytes from 172.17.0.7: icmp_seq=2 ttl=64 time=0.119 ms
bytes from 172.17.0.7: icmp_seq=3 ttl=64 time=0.118 ms
bytes from 172.17.0.7: icmp_seq=4 ttl=64 time=0.101 ms

Create bridge network

1. After installing docker, run the following command to create a bridge network: docker network create testnet

Query the new Created bridge testnet.

#2. Run the container and connect to the testnet network.

Usage: docker run -it --name ---network --network-alias

[root@CentOS ~]# docker run -it --name centos-1 --network testnet --network-alias centos-1 docker.io/centos:latest
[root@CentOS ~]# docker run -it --name centos-2 --network testnet --network-alias centos-2 docker.io/centos:latest

3. Ping from one container to another container. The test results are as follows:

[root@fafe2622f2af /]# ping centos-1
PING centos-1 (172.20.0.2) 56(84) bytes of data.
bytes from centos-1.testnet (172.20.0.2): icmp_seq=1 ttl=64 time=0.158 ms
bytes from centos-1.testnet (172.20.0.2): icmp_seq=2 ttl=64 time=0.108 ms
bytes from centos-1.testnet (172.20.0.2): icmp_seq=3 ttl=64 time=0.112 ms
bytes from centos-1.testnet (172.20.0.2): icmp_seq=4 ttl=64 time=0.113 ms

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