docker中不同容器间的访问方法：
虚拟ip访问
安装docker时，docker会默认创建一个内部的桥接网络docker0，每创建一个容器分配一个虚拟网卡，容器之间可以根据ip互相访问。
[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
......运行一个centos镜像， 查看ip地址得到：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以同样的命令再起一个容器，查看ip地址得到：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容器内部ping测试结果如下：
[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
创建bridge网络
1、安装好docker后，运行如下命令创建bridge网络：docker network create testnet
查询到新创建的bridge testnet。
2、运行容器连接到testnet网络。
使用方法：docker run -it --name <容器名> ---network
[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、从一个容器ping另外一个容器，测试结果如下：
[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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