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[TOC]

### （1）查看当前已经存在的docker网络
```bash
docker network list
```
如：

```bash
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]# docker network list
NETWORK ID     NAME      DRIVER    SCOPE
9741ca08001e   bridge    bridge    local
405291d91242   host      host      local
c07d37e1f457   none      null      local
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]# 
```
### （2）创建192.168.0.0网段的自定义网络
如下，指定网段为192.168.0.0/24，网关为192.168.0.1，网络类型为bridge，网络名称为mynet
```bash
docker network create --driver bridge --subnet 192.168.0.0/16 --gateway 192.168.0.1 mynet
```
创建后再次查看当前docker网络

```bash
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]# docker network list
NETWORK ID     NAME      DRIVER    SCOPE
9741ca08001e   bridge    bridge    local
405291d91242   host      host      local
5fea02b3963d   mynet     bridge    local
c07d37e1f457   none      null      local
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]#
```
### （3）查看具体docker网络的详细信息
如下为查看新创建的mynet网络的详细信息
```bash
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]# docker network inspect mynet
[
    {
        "Name": "mynet",
        "Id": "5fea02b3963d7e7a8628f8c4e6e99d46db28442e6b0ea2a14962963ae1a94ed5",
        "Created": "2021-10-30T20:01:53.186295499 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": {}
    }
]
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]# 
```
### （4）创建名为centos1的docker容器，并指定网络为mynet
```bash
docker run -it --name centos1 --net mynet centos
```
如下为创建后并进入，查看ip

```bash
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]# docker run -it --name centos1 --net mynet centos
[root@e98a944fec1e /]# ip addr
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
217: eth0@if218: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:c0:a8:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 192.168.0.2/16 brd 192.168.255.255 scope global eth0
       valid_lft forever preferred_lft forever
[root@e98a944fec1e /]#
```
### （5）创建名为centos2的docker容器，使用网络mynet
```bash
docker run -it --name centos2 --net mynet centos
```
如下，创建容器后进入并查看网络
```bash
[root@iZbp1flzt6x7pxmxfhmxeeZ ~]# docker run -it --name centos2 --net mynet centos
[root@e4b7913e1581 /]# ip addr
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
219: eth0@if220: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:c0:a8:00:03 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 192.168.0.3/16 brd 192.168.255.255 scope global eth0
       valid_lft forever preferred_lft forever
[root@e4b7913e1581 /]#
```
### （6）在名为centos1的容器中ping名为centos2的容器名
如下，可以ping通
```bash
[root@e98a944fec1e /]# ping centos2 -c 3
PING centos2 (192.168.0.3) 56(84) bytes of data.
64 bytes from centos2.mynet (192.168.0.3): icmp_seq=1 ttl=64 time=0.049 ms
64 bytes from centos2.mynet (192.168.0.3): icmp_seq=2 ttl=64 time=0.072 ms
64 bytes from centos2.mynet (192.168.0.3): icmp_seq=3 ttl=64 time=0.069 ms

--- centos2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.049/0.063/0.072/0.012 ms
[root@e98a944fec1e /]#
```
### （7）在名为centos2的容器中ping名为centos1的容器名
如下，同样可以ping通
```bash
[root@e4b7913e1581 /]# ping centos1 -c 3
PING centos1 (192.168.0.2) 56(84) bytes of data.
64 bytes from centos1.mynet (192.168.0.2): icmp_seq=1 ttl=64 time=0.038 ms
64 bytes from centos1.mynet (192.168.0.2): icmp_seq=2 ttl=64 time=0.069 ms
64 bytes from centos1.mynet (192.168.0.2): icmp_seq=3 ttl=64 time=0.063 ms

--- centos1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 0.038/0.056/0.069/0.016 ms
[root@e4b7913e1581 /]#
```
### （8）自定义网络好处
* 可以自动支持容器名到容器ip的映射，即可以直接把容器名作为ip使用
* 可以为每个集群环境设置独立的网段，从而做到集群之间的隔离
* 可以自定义容器网络的网段

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