Swarm集群搭建
官网:
https://docs.docker.com/engine/swarm/
工作模式:
https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/
搭建集群
1、Docker-1初始化
[root@WALKER ~]# docker swarm init --advertise-addr 192.168.0.103
Swarm initialized: current node (rk8308ds1mbzbaxll8oeiyzal) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join --token SWMTKN-1-5ojh0lt68xhlea80uw52gjtvo7o3fgj8slykf6bdzegw5jfyyb-bi7jgk4p40ei99rrlych8jl7v 192.168.0.103:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
[root@WALKER ~]#
初始化节点:docker swarm init
加入一个节点:docker swarm join
获取令牌:docker swarm join-token manager
docker swarm join-token worker
2、Docker-2加入节点
[root@WALKER ~]# docker swarm join --token SWMTKN-1-5ojh0lt68xhlea80uw52gjtvo7o3fgj8slykf6bdzegw5jfyyb-bi7jgk4p40ei99rrlych8jl7v 192.168.0.103:2377
This node joined a swarm as a worker.
[root@WALKER ~]#
3、在Docker-1上查看一下节点
docker node ls
4、让其他节点加入
Docker-1上生成命令:docker swarm join-token worker
[root@WALKER ~]# docker swarm join-token worker
To add a worker to this swarm, run the following command:
docker swarm join --token SWMTKN-1-5ojh0lt68xhlea80uw52gjtvo7o3fgj8slykf6bdzegw5jfyyb-bi7jgk4p40ei99rrlych8jl7v 192.168.0.103:2377
(让其他主机输入这个命令)
[root@WALKER ~]#
如何想让Docker-4成为manager节点,在Docker-1上输入docker swarm join-token manager,生成的命令Docker-4输入
如果我们这里加入节点错误,需要关闭Docker-4的防火墙:systemctl stop firewalld
我们去Docker-1上再次查看一下节点:
5、小结
一共就两个步骤:
(1)生成主节点init
(2)其他节点加入(manager或者worker)
(注意:我们这里有2主2从,其实是不科学的,至少要有3主!)