Docker Swarm 集群配置

master	node1	node2
192.168.86.133	192.168.86.131	192.168.86.139

配置前准备

关闭各个节点服务器的防火墙

systemctl stop firewalld
systemctl disable firewalld

关闭各个服务器节点的 selinux，修改配置文件/etc/selinux/config，关注SELINUX属性

SELINUX=disabled

配置三台机器 host 文件相互解析

master执行：hostnamectl set-hostname master
node01执行：hostnamectl set-hostname node01
node02执行：hostnamectl set-hostname node02

在每台服务器的 host 配置文件（/etc/hosts）中添加

192.168.86.133 master
192.168.86.131 node01
192.168.86.139 node02

初始化 Swarm

将 master 节点作为管理节点，在该节点执行初始化命令

docker swarm init --advertise-addr 192.168.86.133

输出的结果即为其他工作节点加入集群的命令

Swarm initialized: current node (get5cq8zb3hrelstzf72awfie) is now a manager.

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

    docker swarm join --token SWMTKN-1-34eiblqi14x64pjnmno9ayppnfrmkxtkn12fptq5mcjfj0tpwu-4m4ef5oedq5wnasybbx03h5fy 192.168.86.133:2377

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

将两个工作节点 node1 和 node2 分别加入集群

docker swarm join --token SWMTKN-1-34eiblqi14x64pjnmno9ayppnfrmkxtkn12fptq5mcjfj0tpwu-4m4ef5oedq5wnasybbx03h5fy 192.168.86.133:2377

在管理节点查看集群节点信息

docker node ls

查询结果如下，配置成功

ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
get5cq8zb3hrelstzf72awfie *   master              Ready               Active              Leader              18.03.1-ce
ztlexjj1iu1v8y6960f9shz9z     node01              Ready               Active                                  18.03.1-ce
e4acehmt657d9mo5xd8nbrxm7     node02              Ready               Active                                  18.03.1-ce

为实现集群的高可用，将两个工作节点升级为管理节点，在管理节点执行下列两条命令

docker node promote node01
docker node promote node02

重新查询集群节点信息，结果如下，工作节点状态变为 Reachable，即候选者

ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
get5cq8zb3hrelstzf72awfie *   master              Ready               Active              Leader              18.03.1-ce
ztlexjj1iu1v8y6960f9shz9z     node01              Ready               Active              Reachable           18.03.1-ce
e4acehmt657d9mo5xd8nbrxm7     node02              Ready               Active              Reachable           18.03.1-ce

在集群管理节点manage1上，创建以overlay为驱动的自定义网络

docker network create --driver overlay my-multi-host-network

测试在集群中部署服务

docker service create --replicas 1 --name 别名 镜像ID

# replicas:指定运行服务的数量
# 例如 以下命令将nginx容器中的端口80发布到群集中任何节点的端口8080
docker service create \
  --network my-multi-host-network \
  --name nginx \
  --publish published=8080,target=80 \
  --replicas 3 \
  nginx

查看集群服务

docker service ls

Swarm 常用命令

集群节点相关

Manage Swarm nodes

Options:


Commands:
  demote      Demote one or more nodes from manager in the swarm
  inspect     Display detailed information on one or more nodes
  ls          List nodes in the swarm
  promote     Promote one or more nodes to manager in the swarm
  ps          List tasks running on one or more nodes, defaults to current node
  rm          Remove one or more nodes from the swarm
  update      Update a node

集群网络相关

Usage:  docker network COMMAND

Manage networks

Options:


Commands:
  connect     Connect a container to a network
  create      Create a network
  disconnect  Disconnect a container from a network
  inspect     Display detailed information on one or more networks
  ls          List networks
  prune       Remove all unused networks
  rm          Remove one or more networks

集群 stack 相关

Usage:  docker stack COMMAND

Manage Docker stacks

Options:


Commands:
  deploy      Deploy a new stack or update an existing stack
  ls          List stacks
  ps          List the tasks in the stack
  rm          Remove one or more stacks
  services    List the services in the stack

集群服务相关

Usage:  docker service COMMAND

Manage services

Options:


Commands:
  create      Create a new service
  inspect     Display detailed information on one or more services
  logs        Fetch the logs of a service or task
  ls          List services
  ps          List the tasks of one or more services
  rm          Remove one or more services
  rollback    Revert changes to a service's configuration
  scale       Scale one or multiple replicated services
  update      Update a service

Portainer 集群管理

在小规模的 Docker Swarm 节点上，可以使用 Portainer 的 Agent 模式对集群进行管理。Portainer 是一个 Docker 集群管理 UI 工具，有 CE 版和商业版。其中 CE 版本已经足够使用，此处使用的是 CE 版。

本示例中在本地的虚拟机进行配置，各节点防火墙关闭，在生产环境中需要注意开放对应端口。

在配置好的 swarm 集群的 master 节点编写 compose 文件，对服务进行定义

version: '3'
services:
  portainer:
    image: portainer/portainer
    command: -H tcp://tasks.portainer_agent:9001 --tlsskipverify
    ports:
      - 9000:9000
    networks:
      - my-multi-host-network
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    deploy:
      placement:
        constraints:
          - node.hostname == master

  agent:
    image: portainer/agent
    environment:
       AGENT_CLUSTER_ADDR: tasks.portainer_agent
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /var/lib/docker/volumes:/var/lib/docker/volumes
    networks:
      - my-multi-host-network
    deploy:
      mode: global

networks:
  my-multi-host-network:
    driver: overlay

使用docker stack命令启动服务

docker stack deploy -c docker_portainer.yml portainer

Creating network portainer_my-multi-host-network
Creating service portainer_portainer
Creating service portainer_agent

查看服务是否启动成功

docker service ls

ID                  NAME                  MODE                REPLICAS            IMAGE                        PORTS
z6zs9nei55f8        portainer_agent       global              3/3                 portainer/agent:latest
69nrafn0w3ec        portainer_portainer   replicated          1/1                 portainer/portainer:latest   *:9000->9000/tcp

浏览器登录<master_ip>:9000，注册管理员账号即可登录使用，Portainer 可以直接查看并管理Stack\Service\Containers\Inages\Networks\Volumes等

在这里插入图片描述
下面将配置的私有仓库注册进来，就可以通过 Portainer 直接从私有仓库中拉取镜像