Docker集群管理(Docker Swarm)

1.准备工作。

  • 准备好主机,我测试准备了3台主机。

  IP:192.168.43.28    担任角色:swarm manager

  IP:192.168.43.182  担任角色:swarm node

  IP:192.168.43.110  担任角色:swarm node

  • 安装好Docker Engine 

  CentOS Docker安装:

yum -y install docker

  树莓派安装Docker可以参考:https://yeasy.gitbook.io/docker_practice/install/raspberry-pi

  Windows安装Docker:直接官网下载安装即可。https://desktop.docker.com/win/stable/Docker%20Desktop%20Installer.exe

  • 设置防火墙

关闭三台机器上的防火墙。如果开启防火墙,则需要在所有节点的防火墙上依次放行2377/tcp(管理端口)、7946/udp(节点间通信端口)、4789/udp(overlay 网络端口)端口。

2.创建Swarm并加入节点。

1)创建Swarm,在192.168.43.28 中执行

docker swarm init --advertise-addr 192.168.43.28
执行结果:
Swarm initialized: current node (1lptx3e7syne0b6pnrm987xun) is now a manager.
 
To add a worker to this swarm, run the following command:
 
    # 这就是添加节点的方式(要保存初始化后token,因为在节点加入时要使用token作为通讯的密钥)
    docker swarm join --token SWMTKN-1-4xb3dz6kg3bexpxz5eeifss2dtsmucf74nsixstyin3q169ona-9cwtdkjtdjwlwnsfeloxja6ug 192.168.43.28:2377 
 
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

 2)其他节点加入集群,

  •   获取加入工作节点的token
docker swarm join-token worker

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

docker swarm join --token SWMTKN-1-4xb3dz6kg3bexpxz5eeifss2dtsmucf74nsixstyin3q169ona-9cwtdkjtdjwlwnsfeloxja6ug 192.168.43.28:2377

  

  如果想加入管理节点,获取管理节点token命令

docker swarm join-token manager
  •   加入集群,执行:
docker swarm join --token SWMTKN-1-4xb3dz6kg3bexpxz5eeifss2dtsmucf74nsixstyin3q169ona-9cwtdkjtdjwlwnsfeloxja6ug 192.168.43.28:2377
  •   查看集群中机器及状态
docker node ls
执行结果:
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
v02i9sn3yet34o4twq7ir7ek6     docker-desktop      Ready               Active                                  19.03.8
vqevr5pamsiv155x2ccuxg6eg     docker-desktop      Ready               Active                                  19.03.8
1lptx3e7syne0b6pnrm987xun *   raspberrypi         Ready               Active              Leader              19.03.12
  •   修改节点availablity状态
设置节点不可用:
docker node update --availability drain v02i9sn3yet34o4twq7ir7ek6
设置节点可用:
docker node update --availability active v02i9sn3yet34o4twq7ir7ek6
  •   删除节点
docker node rm --force v02i9sn3yet34o4twq7ir7ek6

 

 3.在swarm中部署服务(nginx为例)

1)创建网络在部署服务,在管理节点(192.168.43.28 )运行命令,

  • 在管理节点(192.168.43.28 )运行命令,创建网络
docker network create -d overlay nginx_net
查看网络
docker network ls | grep nginx_net
  • 在管理节点(192.168.43.28 )运行命令,部署服务
    docker service create --replicas 1 --network nginx_net --name my_nginx -p 80:80 nginx    # 只创建了一个具有一个副本(--replicas 1 )的nginx服务,使用镜像nginx
    运行结果:
    olexfmtdf94sxyeetkchwhehg
    overall progress: 1 out of 1 tasks
    1/1: running   [==================================================>]
    verify: Service converged
    

    注意:不需要提前在节点上下载nginx镜像,这个命令执行后会自动下载这个容器镜像

  • 使用 docker service ls 查看正在运行服务的列表
    docker service ls
    执行结果:
    ID                  NAME                MODE                REPLICAS            IMAGE               PORTS
    olexfmtdf94s        my_nginx            replicated          1/1                 nginx:latest        *:80->80/tcp
    

      

2)查询Swarm中服务的信息(在管理节点上运行)

  • 查看swarm
docker service inspect --pretty my_nginx
运行结果:
ID:             8nx16idy6eystnelu2214tnjj
Name:           my_nginx
Service Mode:   Replicated
 Replicas:      5
Placement:
UpdateConfig:
 Parallelism:   1
 On failure:    pause
 Monitoring Period: 5s
 Max failure ratio: 0
 Update order:      stop-first
RollbackConfig:
 Parallelism:   1
 On failure:    pause
 Monitoring Period: 5s
 Max failure ratio: 0
 Rollback order:    stop-first
ContainerSpec:
 Image:         nginx:latest@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
 Init:          false
Resources:
Networks: nginx_net
Endpoint Mode:  vip
Ports:
 PublishedPort = 80
  Protocol = tcp
  TargetPort = 80
  PublishMode = ingress
  • 查询到哪个节点正在运行该服务
docker service ps my_nginx
运行结果:
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE                ERROR                              PORTS
2xjblebabprw        my_nginx.1          nginx:latest        raspberrypi         Running             Running 7 hours ago
92qra1x9nmsn        my_nginx.2          nginx:latest        docker-desktop      Running             Running 6 hours ago
6my8umxa19nb         \_ my_nginx.2      nginx:latest        docker-desktop      Shutdown            Rejected 7 hours ago         "No such image: nginx:latest@s…"
9r9yp00mku5w        my_nginx.3          nginx:latest        docker-desktop      Running             Running 4 hours ago
kxkw4zofnzu9         \_ my_nginx.3      nginx:latest        docker-desktop      Shutdown            Shutdown 3 hours ago
q39bye7fexwo         \_ my_nginx.3      nginx:latest        docker-desktop      Shutdown            Rejected 6 hours ago         "No such image: nginx:latest@s…"
r5p344468c2h        my_nginx.4          nginx:latest        raspberrypi         Running             Running about an hour ago
v7un0150x9o7         \_ my_nginx.4      nginx:latest        docker-desktop      Shutdown            Shutdown about an hour ago
1h8l0yrokdcz         \_ my_nginx.4      nginx:latest        docker-desktop      Shutdown            Shutdown 3 hours ago
mkx7uh745rfl        my_nginx.5          nginx:latest        raspberrypi         Running             Running about an hour ago
murmvfdqn3kk         \_ my_nginx.5      nginx:latest        docker-desktop      Shutdown            Shutdown about an hour ago

4.在Swarm中动态扩展服务(scale) 

docker service scale my_nginx=4
运行结果:
my_nginx scaled to 4
overall progress: 4 out of 4 tasks
1/4: running   [==================================================>]
2/4: running   [==================================================>]
3/4: running   [==================================================>]
4/4:
verify: Service converged

 

5.其他操作

1)将要离开的节点停止工作(管理节点上执行)

docker node update --availability drain v02i9sn3yet34o4twq7ir7ek6

2)工作节点离开集群(在工作节点执行)

docker swarm leave -f
运行结果:
Node left the swarm.

3)移除节点(管理节点上执行)

docker node rm v02i9sn3yet34o4twq7ir7ek6

docker node rm vqevr5pamsiv155x2ccuxg6eg

4)删除服务,my_nginx

docker service rm my_nginx

这样就会把所有节点上的所有容器(task任务实例)全部删除了  

5)管理节点离开(管理节点上执行)

docker swarm leave -f

  


内容参考:https://www.cnblogs.com/zhujingzhi/p/9792432.html

 

 

上图转自:https://www.cnblogs.com/csnd/p/12061828.html

 

posted @ 2021-02-10 16:43  HandsomeBoy  阅读(1069)  评论(0编辑  收藏  举报