Docker Swarm集群+Portainer控制台配置安装

Docker Swarm 是 Docker 的集群管理工具。它将 Docker 主机池转变为单个虚拟 Docker 主机。swarm 集群由管理节点（manager）和工作节点（work node）构成。
swarm mananger：负责整个集群的管理工作包括集群配置、服务管理等所有跟集群有关的工作。
work node：即图中的 available node，主要负责运行相应的服务来执行任务（task）。

开启Docker API

修改配置文件
vim /lib/systemd/system/docker.service
将
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
修改为
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

重启服务

[root@master ~]# systemctl daemon-reload
[root@master ~]# systemctl restart docker

swarm集群创建

主节点开启

[root@master ~]# docker swarm init --advertise-addr 192.168.1.10
#创建好主节点时会提示—token配置参数，在配置子节点时需要使用该参数（如图）

子节点开启
使用命令docker swarm join --token

[root@node ~]# docker swarm join --token SWMTKN-1-55cvdjet5qrnkayuaa70aozysu3ztjh1ic21y0x8gw9sb5fgcb-b2om9dp4scs452l4gkqmd0814 192.168.1.10:2377
This node joined a swarm as a worker.

可使用命令查询join使用的token值
docker swarm join-token worker

使用docker node ls查询节点状态

[root@master ~]# docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
y8xp0iwjwkmfbxq4rc6qfekpc *   master              Ready               Active              Leader              18.09.6
cscxignpj1qb60c4y8dsgf7s7     node                Ready               Active                                  18.09.6

swarm集群使用

部署服务
部署一个httpd的service，创建名称为web-server

[root@master ~]# docker service create --name web-server httpd
iwjwdip5t893m58tetpegh6wu
overall progress: 1 out of 1 tasks 
1/1: running   [==================================================>] 
verify: Service converged

查看服务状态
查看当前集群中的service

[root@master ~]# docker service ls
ID                  NAME                MODE                REPLICAS            IMAGE                        PORTS
iwjwdip5t893        web-server          replicated          1/1                 httpd:latest

查看部署的web-server状态

[root@master ~]# docker service ps web-server
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
ggrt8ldrjts3        web-server.1        httpd:latest        node                Running             Running 45 seconds ago      
#此时web-server的NODE为node节点，状态为running

服务伸缩，拓展副本
将服务数增加副本，同时运行多个实例
service scale可调整副本数，增加或减少

[root@master ~]# docker service scale web-server=5
web-server scaled to 5
overall progress: 5 out of 5 tasks 
1/5: running   [==================================================>] 
2/5: running   [==================================================>] 
3/5: running   [==================================================>] 
4/5: running   [==================================================>] 
5/5: running   [==================================================>] 
verify: Service converged

#此时查看服务状态就有5个web-server部署在node节点或master节点
[root@master ~]# docker service ps web-server
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE             
ggrt8ldrjts3        web-server.1        httpd:latest        node                Running             Running 6 minutes ago                            
ue2rls32fdyi        web-server.2        httpd:latest        master              Running             Running 41 seconds ago                           
n5e626vifmv8        web-server.3        httpd:latest        node                Running             Running about a minute ago                       
iq7y8ru24oy5        web-server.4        httpd:latest        master              Running             Running 41 seconds ago                           
tp56mrrszkel        web-server.5        httpd:latest        node                Running             Running about a minute ago

服务访问
将web-server的80端口映射到外部

[root@master ~]# docker service update --publish-add 80:80 web-server
web-server
overall progress: 5 out of 5 tasks 
1/5: running   [==================================================>] 
2/5: running   [==================================================>] 
3/5: running   [==================================================>] 
4/5: running   [==================================================>] 
5/5: running   [==================================================>] 
verify: Service converged

测试

Portainer安装

Portainer 是 Docker 的图形化管理工具，提供状态显示面板、应用模板快速部署、容器镜像网络数据卷的基本操作（包括上传和下载镜像、创建容器等操作）、事件日志显示、容器控制台操作、Swarm 集群和服务等集中管理和操作、登录用户管理和控制等功能。功能十分全面，基本能满足中小型企业对容器管理的全部需求。

Master 节点，安装 Portainer。

[root@master ~]# docker service create --name portainer --publish 9000:9000 --replicas=1 --constraint 'node.role == manager' --mount type=bind,src=//var/run/docker.sock,dst=/var/run/docker.sock --mount type=volume,src=portainer_data,dst=/data portainer/portainer -H unix:///var/run/docker.sock 
wbpvqhg13fzrqrwl7epcbhqgo
overall progress: 1 out of 1 tasks 
1/1: running   [==================================================>] 
verify: Service converged

portainer以一个容器服务开启，可在容器进程中查询
[root@master ~]# docker ps