Mutil-host networking with etcd

Mutil-host networking with etcd

setup etcd cluster

在docker-node1上

ubuntu@docker-node1:~$ wget https://github.com/coreos/etcd/releases/download/v3.0.12/etcd-v3.0.12-linux-amd64.tar.gz
ubuntu@docker-node1:~$ tar zxvf etcd-v3.0.12-linux-amd64.tar.gz
ubuntu@docker-node1:~$ cd etcd-v3.0.12-linux-amd64
ubuntu@docker-node1:~$ nohup ./etcd --name docker-node1 --initial-advertise-peer-urls http://192.168.205.10:2380 \
--listen-peer-urls http://192.168.205.10:2380 \
--listen-client-urls http://192.168.205.10:2379,http://127.0.0.1:2379 \
--advertise-client-urls http://192.168.205.10:2379 \
--initial-cluster-token etcd-cluster \
--initial-cluster docker-node1=http://192.168.205.10:2380,docker-node2=http://192.168.205.11:2380 \
--initial-cluster-state new&

在docker-node2上

ubuntu@docker-node2:~$ wget https://github.com/coreos/etcd/releases/download/v3.0.12/etcd-v3.0.12-linux-amd64.tar.gz
ubuntu@docker-node2:~$ tar zxvf etcd-v3.0.12-linux-amd64.tar.gz
ubuntu@docker-node2:~$ cd etcd-v3.0.12-linux-amd64/
ubuntu@docker-node2:~$ nohup ./etcd --name docker-node2 --initial-advertise-peer-urls http://192.168.205.11:2380 \
--listen-peer-urls http://192.168.205.11:2380 \
--listen-client-urls http://192.168.205.11:2379,http://127.0.0.1:2379 \
--advertise-client-urls http://192.168.205.11:2379 \
--initial-cluster-token etcd-cluster \
--initial-cluster docker-node1=http://192.168.205.10:2380,docker-node2=http://192.168.205.11:2380 \
--initial-cluster-state new&

检查cluster状态

ubuntu@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl cluster-health
member 21eca106efe4caee is healthy: got healthy result from http://192.168.205.10:2379
member 8614974c83d1cc6d is healthy: got healthy result from http://192.168.205.11:2379
cluster is healthy

重启docker服务

在docker-node1上

$ sudo service docker stop
$ sudo /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://192.168.205.10:2379 --cluster-advertise=192.168.205.10:2375&

在docker-node2上

$ sudo service docker stop
$ sudo /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://192.168.205.11:2379 --cluster-advertise=192.168.205.11:2375&

创建overlay network

在docker-node1上创建一个demo的overlay network

ubuntu@docker-node1:~$ sudo docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
0e7bef3f143a        bridge              bridge              local
a5c7daf62325        host                host                local
3198cae88ab4        none                null                local
ubuntu@docker-node1:~$ sudo docker network create -d overlay demo
3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9
ubuntu@docker-node1:~$ sudo docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
0e7bef3f143a        bridge              bridge              local
3d430f3338a2        demo                overlay             global
a5c7daf62325        host                host                local
3198cae88ab4        none                null                local
ubuntu@docker-node1:~$ sudo docker network inspect demo
[
    {
        "Name": "demo",
        "Id": "3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9",
        "Scope": "global",
        "Driver": "overlay",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "10.0.0.0/24",
                    "Gateway": "10.0.0.1/24"
                }
            ]
        },
        "Internal": false,
        "Containers": {},
        "Options": {},
        "Labels": {}
    }
]

我们会看到在node2上，这个demo的overlay network会被同步创建

ubuntu@docker-node2:~$ sudo docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
c9947d4c3669        bridge              bridge              local
3d430f3338a2        demo                overlay             global
fa5168034de1        host                host                local
c2ca34abec2a        none                null                local

通过查看etcd的key-value, 我们获取到，这个demo的network是通过etcd从node1同步到node2的

ubuntu@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl ls /docker
/docker/network
/docker/nodes
ubuntu@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl ls /docker/nodes
/docker/nodes/192.168.205.11:2375
/docker/nodes/192.168.205.10:2375
ubuntu@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl ls /docker/network/v1.0/network
/docker/network/v1.0/network/3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9
ubuntu@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl get /docker/network/v1.0/network/3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9 | jq .
{
  "addrSpace": "GlobalDefault",
  "enableIPv6": false,
  "generic": {
    "com.docker.network.enable_ipv6": false,
    "com.docker.network.generic": {}
  },
  "id": "3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9",
  "inDelete": false,
  "ingress": false,
  "internal": false,
  "ipamOptions": {},
  "ipamType": "default",
  "ipamV4Config": "[{\"PreferredPool\":\"\",\"SubPool\":\"\",\"Gateway\":\"\",\"AuxAddresses\":null}]",
  "ipamV4Info": "[{\"IPAMData\":\"{\\\"AddressSpace\\\":\\\"GlobalDefault\\\",\\\"Gateway\\\":\\\"10.0.0.1/24\\\",\\\"Pool\\\":\\\"10.0.0.0/24\\\"}\",\"PoolID\":\"GlobalDefault/10.0.0.0/24\"}]",
  "labels": {},
  "name": "demo",
  "networkType": "overlay",
  "persist": true,
  "postIPv6": false,
  "scope": "global"
}