Docker四种网络类型原理实例解析
导读
四种网络类型:
None:不为容器配置任何网络功能,--net=none
Container:与另一个运行中的容器共享Network Namespace,--net=container:containerID(K8S)
Host:与宿主机共享Network Namespace,--net=host
Bridge:Docker设计的NAT网络模型
下面分别讲解下:
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
这种没有ip,可以在容器里随便玩,没有多大意义
container类型的网络:
[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 共用了主机名的ip地址 可以查看属性 [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": {}
要注意的是这种公用container类型的端口是谁先用某个端口,谁就占了,后来的没法使用这个端口
host类型
[root@docker1 centos_zabbix]# docker run -it --network=host centos6.9_nginx_ssh:v2 /bin/bash
这种就是和宿主机共用端口,谁先占谁用,但是性能最高,所以我们在构建镜像的时候使用了这个参数,就是为了统一网络类型,提高构建镜像的效率
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