一、简介

1.docker的虚拟网卡

3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:21:58:54:d8 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:21ff:fe58:54d8/64 scope link
       valid_lft forever preferred_lft forever

2.三大网络模式

[root@lizj ~]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
6094c1d0fbe1   bridge    bridge    local
cdbf80f287ba   host      host      local
db1baa4a70c9   none      null      local

bridge模式：使用--network bridge指定，默认使用docker0
host模式：使用--network host指定
none模式：使用--network none指定
container模式：使用--network container:NAME或者容器ID指定

3.基本命令

查看网络docker network Is
查看网络源数据docker network inspect XXX网络名字
删除网络docker network rm XXX网络名字

二、自定义网络

创建网卡（默认为桥接模式）：docker network create lzj_network
创建容器时自定义网卡：docker -d -p 8080:8081 --network lzj_network --name docker1 centosjava8

[root@lizj ~]# docker run -it --network lzj_network --name docker1 billygoo/tomcat8-jdk8 /bin/bash
root@084986fee7bc:/usr/local/tomcat# 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
97: eth0@if98: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:ac:12:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.18.0.2/16 brd 172.18.255.255 scope global eth0
       valid_lft forever preferred_lft forever
root@084986fee7bc:/usr/local/tomcat# [root@lizj ~]# docker run -it --network lzj_network --name docker2 billygoo/tomcat8-jdk8 /bin/bash
root@6dee2c2cc66f:/usr/local/tomcat# 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
99: eth0@if100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:ac:12:00:03 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.18.0.3/16 brd 172.18.255.255 scope global eth0
       valid_lft forever preferred_lft forever
root@6dee2c2cc66f:/usr/local/tomcat# ping docker 1
^C
root@6dee2c2cc66f:/usr/local/tomcat# ping docker1
PING docker1 (172.18.0.2) 56(84) bytes of data.
64 bytes from docker1.lzj_network (172.18.0.2): icmp_seq=1 ttl=64 time=0.124 ms
64 bytes from docker1.lzj_network (172.18.0.2): icmp_seq=2 ttl=64 time=0.050 ms

可以观察到自定义网卡，可以用容器名进行通信