docker自定义网络

# 创建自定义网络
docker network create --driver bridge --subnet 192.168.0.0/16 --gateway  192.168.0.1 mynet
[root@iZuf65o9ovhniso4w0oji5Z ~]# docker network ls
NETWORK ID     NAME          DRIVER    SCOPE
ebab00407ee4   bridge        bridge    local
f5ddb2cf2442   host          host      local
9167bc2bd975   mynet         bridge    local
ffecf7ecf421   none          null      local
2f62a5163aa1   somenetwork   bridge    local
# 自定义的网络创建成功！
[root@iZuf65o9ovhniso4w0oji5Z ~]# docker network inspect mynet
[{"Name": "mynet","Id": "9167bc2bd9757c3b191961b4aed6642d38452548f92b8ba94ff3a64e6882e458","Created": "2021-06-04T09:05:33.869905653+08:00","Scope": "local","Driver": "bridge","EnableIPv6": false,"IPAM": {"Driver": "default","Options": {},"Config": [{"Subnet": "192.168.0.0/16","Gateway": "192.168.0.1"}]},"Internal": false,"Attachable": false,"Ingress": false,"ConfigFrom": {"Network": ""},"ConfigOnly": false,"Containers": {},"Options": {},"Labels": {}}
]
# 创建两个tomcat用自定义的网络
[root@iZuf65o9ovhniso4w0oji5Z ~]#  docker run -d -P --name tomcat-net-01 --net mynet tomcat
6ce6670ba1f5088691809dd514c3e1f343c265f38809801cfb95ea0c11073db2
[root@iZuf65o9ovhniso4w0oji5Z ~]#  docker run -d -P --name tomcat-net-02 --net mynet tomcat
fe19eae899865a5a03f2cca37136a1682408e680f83a9cbb141c1f25cf73baaf
# 查看网络的信息
[root@iZuf65o9ovhniso4w0oji5Z ~]# docker network inspect mynet
[{"Name": "mynet","Id": "9167bc2bd9757c3b191961b4aed6642d38452548f92b8ba94ff3a64e6882e458","Created": "2021-06-04T09:05:33.869905653+08:00","Scope": "local","Driver": "bridge","EnableIPv6": false,"IPAM": {"Driver": "default","Options": {},"Config": [{"Subnet": "192.168.0.0/16","Gateway": "192.168.0.1"}]},"Internal": false,"Attachable": false,"Ingress": false,"ConfigFrom": {"Network": ""},"ConfigOnly": false,"Containers": {"6ce6670ba1f5088691809dd514c3e1f343c265f38809801cfb95ea0c11073db2": {"Name": "tomcat-net-01","EndpointID": "ffa882cac269b2c0895c6074a7c184aa94dda4d56e88cd83c0757e2e50aa7305","MacAddress": "02:42:c0:a8:00:02","IPv4Address": "192.168.0.2/16","IPv6Address": ""},"fe19eae899865a5a03f2cca37136a1682408e680f83a9cbb141c1f25cf73baaf": {"Name": "tomcat-net-02","EndpointID": "b54b30ce140c224a21797c2aef1671f2db3fb499d621347c3e259cd911000dd3","MacAddress": "02:42:c0:a8:00:03","IPv4Address": "192.168.0.3/16","IPv6Address": ""}},"Options": {},"Labels": {}}
]

自己创建网络的好处：
1 docker exec -it tomcat-net-01 ping 192.168.0.3 可以ping通，通过名字也可以ping通
2 不同的集群使用不同的网络，保证集群是安全和健康的

思考：想要让docker0网络下的newtomcat01和自定义网络下的tomcat-net-01连通？

查看docker network的命令：

connect：连接容器到一个网络中

[root@iZuf65o9ovhniso4w0oji5Z ~]# docker network connect mynet newtomcat01
[root@iZuf65o9ovhniso4w0oji5Z ~]# docker network inspect mynet
[{"Name": "mynet","Id": "9167bc2bd9757c3b191961b4aed6642d38452548f92b8ba94ff3a64e6882e458","Created": "2021-06-04T09:05:33.869905653+08:00","Scope": "local","Driver": "bridge","EnableIPv6": false,"IPAM": {"Driver": "default","Options": {},"Config": [{"Subnet": "192.168.0.0/16","Gateway": "192.168.0.1"}]},"Internal": false,"Attachable": false,"Ingress": false,"ConfigFrom": {"Network": ""},"ConfigOnly": false,"Containers": {"6ce6670ba1f5088691809dd514c3e1f343c265f38809801cfb95ea0c11073db2": {"Name": "tomcat-net-01","EndpointID": "ffa882cac269b2c0895c6074a7c184aa94dda4d56e88cd83c0757e2e50aa7305","MacAddress": "02:42:c0:a8:00:02","IPv4Address": "192.168.0.2/16","IPv6Address": ""},"e043c76a5c19b280e6c5a0e940ec395090b7557dee04496b7bda54310160a69a": {"Name": "newtomcat01","EndpointID": "8c4967650980ee06e3a450c1f320a14ad60955bca07a483b34da3731b7411f47","MacAddress": "02:42:c0:a8:00:04","IPv4Address": "192.168.0.4/16","IPv6Address": ""},"fe19eae899865a5a03f2cca37136a1682408e680f83a9cbb141c1f25cf73baaf": {"Name": "tomcat-net-02","EndpointID": "b54b30ce140c224a21797c2aef1671f2db3fb499d621347c3e259cd911000dd3","MacAddress": "02:42:c0:a8:00:03","IPv4Address": "192.168.0.3/16","IPv6Address": ""}},"Options": {},"Labels": {}}
]

connect 把容器直接加到网络中实现互联。即一个容器两个ip，类似于阿里云服务，一个公网ip，一个私网ip。

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