详解使用docker 1.12 搭建多主机docker swarm集群

#命令格式: docker swarm init --listen-addr <MANAGER-IP>:<PORT>
[root@centos-node4 ~]# docker swarm init --listen-addr 192.168.99.101:2377
Swarm initialized: current node (a60d5c3ttymvtozr46uvk17q4) is now a manager. 

查看结果

[root@centos-node4 ~]# docker node ls
ID              HOSTNAME   MEMBERSHIP STATUS AVAILABILITY MANAGER STATUS
a60d5c3ttymvtozr46uvk17q4 * centos-node4 Accepted  Ready  Active    Leader 

把swarm-agent1(centos-node5: 192.168.99.102)添加到swarm集群

在swarm-agent1上执行:

#命令格式: docker swarm join <MANAGER-IP>:<PORT>
[root@centos-node5 ~]# docker swarm join 192.168.99.101:2377
This node joined a Swarm as a worker. 

在swarm manager查看结果

[root@centos-node4 ~]# docker node ls
ID              HOSTNAME   MEMBERSHIP STATUS AVAILABILITY MANAGER STATUS
0ypcw58hjlcvr0xqbtizmau62  centos-node5 Accepted  Ready  Active
a60d5c3ttymvtozr46uvk17q4 * centos-node4 Accepted  Ready  Active    Leader

创建一个overlay 跨主机网络

查看原有网络

[root@centos-node4 ~]# docker network ls
NETWORK ID     NAME        DRIVER       SCOPE
abec77415f48    bridge       bridge       local
e2fff9d572a6    docker_gwbridge   bridge       local
166bd71f7d0e    host        host        local
9gr6bfff1rv9    ingress       overlay       swarm
1d2bfc590294    none        null        local 

可以看到在swarm上默认已有一个名为ingress的overlay 网络,默认在swarm里使用，本文会创建一个新的

创建一个新的overlay网络

 [root@centos-node4 ~]# docker network create --driver overlay docker-net
aoqs3p835s5glx69hi46ou2dw
 [root@centos-node4 ~]# docker network ls
NETWORK ID     NAME        DRIVER       SCOPE
abec77415f48    bridge       bridge       local
aoqs3p835s5g    docker-net     overlay       swarm
e2fff9d572a6    docker_gwbridge   bridge       local
166bd71f7d0e    host        host        local
9gr6bfff1rv9    ingress       overlay       swarm
1d2bfc590294    none        null        local

新的网络(docker-net)已创建

在新的跨主机overlay 网络(docker-net)上创建应用

部署

用alpine镜像在docker-net网络上启动两个实例, 并编排为一组服务

[root@centos-node4 ~]# docker service create --replicas 2 --name helloworld --network=docker-net alpine ping docker.com
5lgdq3ihiez0o7h2uegu4fgd3 

查看部署结果

								 
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