我要评论docker network自定义网络
现在官方已经废弃了 run --link 的使用（可通过容器名来 ping 通），所以我们可以采用自定义网络的做法来联通容器
第一步
组建子网，我取名为 nettest
docker network create --driver bridge --subnet 192.168.0.0/16 --gateway 192.168.0.1 nettest
注意我这里是使用ip地址前16位作为cidr前缀，不要和集群内的其他子网冲突
可用 docker network inspect nettest 指令查看子网信息
[
{
"name": "nettest",
"id": "241ec33539eae571bd0ce269f9b6ec8525dfbbe5e96d1c7e00539fa10a0adc10",
"created": "2022-03-31t13:07:44.672058045+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": {}
}
]第二步
向nettest子网添加容器，这里我将两个我自己定义的centos容器加入了该子网
docker run -d -p --name centos-net-01 --net nettest mycentos docker run -d -p --name centos-net-02 --net nettest mycentos
如果不指定net，则会自动加入bridge网络（对应于docker0网桥）
此时再次查看子网信息
[
{
"name": "nettest",
"id": "241ec33539eae571bd0ce269f9b6ec8525dfbbe5e96d1c7e00539fa10a0adc10",
"created": "2022-03-31t13:07:44.672058045+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": {
"126e1b28a5958ee159fa16073501cbc61508ce803ccaab1682489fb859fe6ae3": {
"name": "centos-net-02",
"endpointid": "14ae44c2a7f9b7572b814e86c06fef3597d5eb2308ea588c91cabe38d22ec426",
"macaddress": "02:42:c0:a8:00:03",
"ipv4address": "192.168.0.3/16",
"ipv6address": ""
},
"903a5af6d1050998523a23b10f0dcee86f7d8a35cca8544ea5499b5cd6d22c9f": {
"name": "centos-net-01",
"endpointid": "7c1ff29b1fad9df3943d4d3eda6520cce66ebcbe61a8c5127b3161ddb7f6649a",
"macaddress": "02:42:c0:a8:00:02",
"ipv4address": "192.168.0.2/16",
"ipv6address": ""
}
},
"options": {},
"labels": {}
}
]可以发现 "containers" 下多了两个容器对象
而网关为宿主机
第三步
测试子网内的容器是否能联通
可以发现通过容器名和其对应的内网ip都能ping通
而这种自定义网络我在容器的/etc/hosts中并没有看到其他容器的域名ip映射
如果后续还需要向该子网添加容器，可以使用以下指令
docker network connect multi-host-network container1
[root@hadoop100 docker-test-volume]# docker network connect nettest centos-net-03
[root@hadoop100 docker-test-volume]# docker network inspect nettest
[
{
"name": "nettest",
"id": "241ec33539eae571bd0ce269f9b6ec8525dfbbe5e96d1c7e00539fa10a0adc10",
"created": "2022-03-31t13:07:44.672058045+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": {
"126e1b28a5958ee159fa16073501cbc61508ce803ccaab1682489fb859fe6ae3": {
"name": "centos-net-02",
"endpointid": "14ae44c2a7f9b7572b814e86c06fef3597d5eb2308ea588c91cabe38d22ec426",
"macaddress": "02:42:c0:a8:00:03",
"ipv4address": "192.168.0.3/16",
"ipv6address": ""
},
"163f33f66ba95bc9ee7dece20f87fe7c18ec290cd2618145bba1a07d7ebf2b6e": {
"name": "centos-net-03",
"endpointid": "6854d517cae02fa4b41fdd4c6406afd61c6529a573257829bc78003dca01b079",
"macaddress": "02:42:c0:a8:00:04",
"ipv4address": "192.168.0.4/16",
"ipv6address": ""
},
"903a5af6d1050998523a23b10f0dcee86f7d8a35cca8544ea5499b5cd6d22c9f": {
"name": "centos-net-01",
"endpointid": "7c1ff29b1fad9df3943d4d3eda6520cce66ebcbe61a8c5127b3161ddb7f6649a",
"macaddress": "02:42:c0:a8:00:02",
"ipv4address": "192.168.0.2/16",
"ipv6address": ""
}
},
"options": {},
"labels": {}
}
]我之前使用run --link来联通容器时，发现其中被link的源容器被我stop后两个容器都从docker进程中消失了，而这种自定义网络则不会出现这种奇怪的现象
最后需要强调一点，千万不要试图去使用 docker network rm -f $(docker network ls -q) 这种指令，这可能会把docker默认创建的网络也给删去！
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持代码网。
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