Swarm 单节点快速上手

初始化

docker info 这个命令可以查看我们的docker engine有没有激活swarm模式， 默认是没有的，我们会看到

Swarm: inactive

激活swarm，有两个方法：

• 初始化一个swarm集群，自己成为manager
• 加入一个已经存在的swarm集群

> docker swarm init
Swarm initialized: current node (vjtstrkxntsacyjtvl18hcbe4) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-33ci17l1n34fh6v4r1qq8qmocjo347saeuer2xrxflrn25jgjx-7vphgu8a0gsa4anof6ffrgwqb 192.168.65.3:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

> docker node ls
ID                            HOSTNAME         STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
vjtstrkxntsacyjtvl18hcbe4 *   docker-desktop   Ready     Active         Leader           20.10.7

docker swarm init 背后发生了什么

主要是PKI和安全相关的自动化

• 创建swarm集群的根证书
• manager节点的证书
• 其它节点加入集群需要的tokens

创建Raft数据库用于存储证书，配置，密码等数据

RAFT相关资料

• http://thesecretlivesofdata.com/raft/
• https://raft.github.io/
• https://docs.docker.com/engine/swarm/raft/

退出swarm使其为非激活状态

• 使用docker swarm leave

[root@localhost docker-exec]# docker swarm

Usage:  docker swarm COMMAND

Manage Swarm

Commands:
  ca          Display and rotate the root CA
  init        Initialize a swarm
  join        Join a swarm as a node and/or manager
  join-token  Manage join tokens
  leave       Leave the swarm
  unlock      Unlock swarm
  unlock-key  Manage the unlock key
  update      Update the swarm

Run 'docker swarm COMMAND --help' for more information on a command.

[root@localhost docker-exec]# docker swarm leave
Error response from daemon: You are attempting to leave the swarm on a node that is participating as a manager. Removing the last manager erases all current state of the swarm. Use `--force` to ignore this message.
[root@localhost docker-exec]# docker swarm leave --force

Node left the swarm.