一、 環境準備
1. 準備3臺虛擬機，IP和主機名設置如下
192.168.71.137
manager1
192.168.71.141
worker1
192.168.71.140
worker2
2. 系統和軟件版本
系統版本
[root@manager1 ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
內核版本
[root@manager1 ~]# uname -r
3.10.0-327.36.1.el7.x86_64
docker 版本
[root@manager1 ~]# docker -v
Docker version 1.12.2, build bb80604
3. 防火牆開通相關端口
放行一下端口：
TCP 2377 集羣管理通信所需
TCP and UDP 7946 節點間通信所需
TCP and UDP 4789 overlay 網絡所需
命令如下：
firewall-cmd --add-port=2377/tcp
firewall-cmd --add-port=2377/tcp --permanent
firewall-cmd --add-port=7946/tcp --add-port 7946/udp
firewall-cmd --add-port=7946/tcp --add-port 7946/udp --permanent
firewall-cmd --add-port=4789/tcp --add-port 4789/udp
firewall-cmd --add-port=4789/tcp --add-port 4789/udp --permanent
二、 swarm集羣創建
1. 創建swarm集羣
初始化命令如下，我這裏用192.168.71.137爲manager
docker swarm init --advertise-addr <MANAGER-IP>
[root@manager1 ~]# docker swarm init --advertise-addr 192.168.71.137
Swarm initialized: current node (8d1kzvnv99q2gy82ulrklezom) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join \
--token SWMTKN-1-12k7eupx7wbuhdhyb1qo2vu8q49x8k4uq0d0t62ksb8irlylex-6fz55egsirm1l5076pin7ksc6 \
192.168.71.137:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
根據以上提示，可知節點加入集羣需執行以上返回的那條命令。
查看docker info,顯示docker工作在swarm模式
[root@manager1 ~]# docker info
...
Swarm: active
...
查看管理節點已啓動起來一個節點
[root@manager1 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
8d1kzvnv99q2gy82ulrklezom * manager1 Ready Active Leader
在work1 、worker2上執行加入集羣的命令
[root@worker1 ~]# docker swarm join \
> --token SWMTKN-1-12k7eupx7wbuhdhyb1qo2vu8q49x8k4uq0d0t62ksb8irlylex-6fz55egsirm1l5076pin7ksc6 \
> 192.168.71.137:2377
This node joined a swarm as a worker.
[root@worker2 ~]# docker swarm join \
> --token SWMTKN-1-12k7eupx7wbuhdhyb1qo2vu8q49x8k4uq0d0t62ksb8irlylex-6fz55egsirm1l5076pin7ksc6 \
> 192.168.71.137:2377
This node joined a swarm as a worker.
如果上面的命令不記得了，可以在manager1節點上用以下命令查看
[root@manager1 ~]# docker swarm join-token worker
To add a worker to this swarm, run the following command:
docker swarm join \
--token SWMTKN-1-12k7eupx7wbuhdhyb1qo2vu8q49x8k4uq0d0t62ksb8irlylex-6fz55egsirm1l5076pin7ksc6 \
192.168.71.137:2377
在manager1節點上再次查看node列表信息
[root@manager1 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
8d1kzvnv99q2gy82ulrklezom * manager1 Ready Active Leader
8iwemhb8ux2fedbdn12c9igii worker2 Ready Active
bdmj4stzpnwmkovonnxj6u4q9 worker1 Ready Active
說明集羣已創建完成。