Docker's four network types principle examples

Four network types:

None: Do not configure any network function for the container, --net=none
Container: Share the Network Namespace with another running container, --net=container:containerID (K8S)
Host: Share the Network Namespace with the host, --net=host
Bridge: NAT network model designed by Docker

The following are explained separately:

none:

[root@docker1 centos_zabbix]# docker run -it --network none centos6.9_ssh:v2 /bin/bash
[root@6ae597015723 /]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
  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

This kind of thing has no IP and can be played around in the container, which doesn't make much sense

Container type network:

[root@1c21de6080bb html]# [root@docker1 centos_zabbix]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1c21de6080bb centos6.9_nginx_ssh:v3 "/bin/bash" 26 seconds ago Up 25 seconds vigorous_payne
[root@docker1 centos_zabbix]# docker run -it --network container:1c21de6080bb centos6.9_nginx_ssh:v4 /bin/bash
 
The IP address that shares the host name can view the properties [root@docker1 centos_zabbix]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
41c457f6b89d centos6.9_nginx_ssh:v4 "/bin/bash" 5 minutes ago Up 5 minutes loving_curie
1c21de6080bb centos6.9_nginx_ssh:v3 "/bin/bash" 6 minutes ago Up 6 minutes vigorous_payne
 
[root@docker1 centos_zabbix]# docker inspect 41c457f6b89d|grep -i network
      "NetworkMode": "container:1c21de6080bb8c83e800fa8b5fb15782a18bb61ab292050ca1172fbb866b1afc",
    "NetworkSettings": {
      "Networks": {}

It should be noted that whoever uses a port first will occupy it, and later users will not be able to use this port.

Host type

[root@docker1 centos_zabbix]# docker run -it --network=host centos6.9_nginx_ssh:v2 /bin/bash

This is to share the port with the host machine, whoever occupies it first will use it, but the performance is the highest, so we use this parameter when building the image, just to unify the network type and improve the efficiency of building the image

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