Docker35:Docker Swarm集群搭建

1. Docker Swarm官方文档 2. 工作模式 3. Swarm使用 3.1 查看机器ip地质 3.2 绑定ip 4. 步骤总结 5. Raft协议 6. Raft协议测试 6.1 模拟宕机 6.2 docker03节点离开 6.3 将docker03成为主节点

1. Docker Swarm官方文档

Swarm mode overview

Estimated reading time: 3 minutes To use Docker in swarm mode, install Docker. See installation instructions for all operating systems and platforms. Current versions of Docker include swarm mode for natively managing a cluster of Docker Engines called a swarm. Use the Docker CLI to create a swarm, deploy application services to a swarm, and manage swarm behavior.

https://docs.docker.com/engine/swarm/

2. 工作模式

10机器 Swarm

更多 K8S（使用较多）

工作节点（work）工作

管理节点（manager）操作

3. Swarm使用

3.1 查看机器ip地质


ip addr

3.2 绑定ip

docker01机器

docker01中初始化节点


docker swarm init --advertise-addr 192.168.92.138


# 获取令牌
docker swarm join-token manager
docker swarm join-token worker

docker02机器

docker02以worker方式加入docker01中


root@docker02:/home# docker swarm join --token SWMTKN-1-2c5y4hmr1aozzxsixj3w2byokwojjt7a1mudzacshsjjt2js3n-4le7c6t6aur8cq757kcm6rtlo 192.168.92.138:2377

docker01机器

查看信息


root@docker01:/home# docker node ls
ID                            HOSTNAME   STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
2zs5wbbsn12omyp7btmbdnas9 *   docker01   Ready     Active         Leader           20.10.11
khzujzz2jhp8hq6arqerhwhui     docker02   Ready     Active                          20.10.11
root@docker01:/home#

docker01机器

生成worker命令


root@docker01:/home# docker swarm join-token worker
To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-2c5y4hmr1aozzxsixj3w2byokwojjt7a1mudzacshsjjt2js3n-4le7c6t6aur8cq757kcm6rtlo 192.168.92.138:2377

root@docker01:/home#

docker03机器


root@docker03:/home# docker swarm join --token SWMTKN-1-2c5y4hmr1aozzxsixj3w2byokwojjt7a1mudzacshsjjt2js3n-4le7c6t6aur8cq757kcm6rtlo 192.168.92.138:2377
This node joined a swarm as a worker.
root@docker03:/home#

docker01机器

查看信息

docker01机器

生成manager命令


root@docker01:/home# docker swarm join-token manager
To add a manager to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-2c5y4hmr1aozzxsixj3w2byokwojjt7a1mudzacshsjjt2js3n-bn1rz2sp80s6zy9ujxgil89uk 192.168.92.138:2377

root@docker01:/home#

docker04机器

以主机点加入


root@docker04:/home# docker swarm join --token SWMTKN-1-2c5y4hmr1aozzxsixj3w2byokwojjt7a1mudzacshsjjt2js3n-bn1rz2sp80s6zy9ujxgil89uk 192.168.92.138:2377
This node joined a swarm as a manager.
root@docker04:/home#

docker01机器

查看信息

4. 步骤总结

生成节点init

加入（manager、worker两种方式）

5. Raft协议

集群至少大于3台

至少有3个主节点

Raft：至少保证大多数节点存活，才可以使用，高可用！

弹性、扩缩容

6. Raft协议测试

当docker01机器停止，宕机！当前是两主两从。

6.1 模拟宕机

停止docker01


root@docker01:/home# sudo systemctl stop docker

docker04成为leader

6.2 docker03节点离开

docker03


root@docker03:/home# docker swarm leave
Node left the swarm.
root@docker03:/home#

docker01、docker04任意一个主节点都可以查看，docker03 状态为down


root@docker04:/home# docker node ls
ID                            HOSTNAME   STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
2zs5wbbsn12omyp7btmbdnas9     docker01   Ready     Active         Reachable        20.10.11
khzujzz2jhp8hq6arqerhwhui     docker02   Ready     Active                          20.10.11
4ehul5i4jfmbza857ejyeabww     docker03   Down      Active                          20.10.11
i7nuattd1reioyo4n7gx2bzc2 *   docker04   Ready     Active         Leader           20.10.11
root@docker04:/home#

6.3 将docker03成为主节点

docker01、docker04任意一个主节点都可生成manager令牌


root@docker01:/home# docker swarm join-token manager
To add a manager to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-2c5y4hmr1aozzxsixj3w2byokwojjt7a1mudzacshsjjt2js3n-bn1rz2sp80s6zy9ujxgil89uk 192.168.92.138:2377

root@docker01:/home#

docker03


root@docker03:/home# docker swarm join --token SWMTKN-1-2c5y4hmr1aozzxsixj3w2byokwojjt7a1mudzacshsjjt2js3n-bn1rz2sp80s6zy9ujxgil89uk 192.168.92.138:2377
This node joined a swarm as a manager.
root@docker03:/home#