1、概念
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。 Docker Swarm 提供了标准的 Docker API，所有任何已经与 Docker 守护程序通信的工具都可以使用 Swarm 轻松地扩展到多个主机。
2、拓扑图
3、部署docker
tar xf docker-20.10.5.tgz cp docker/* /usr/bin/ vi /etc/systemd/system/docker.service [Unit] Description=Docker Application Container Engine Documentation=https://docs.docker.com After=network-online.target firewalld.service Wants=network-online.target [Service] Type=notify # the default is not to use systemd for cgroups because the delegate issues still # exists and systemd currently does not support the cgroup feature set required # for containers run by docker ExecStart=/usr/bin/dockerd --selinux-enabled=false --insecure-registry=127.0.0.1 ExecReload=/bin/kill -s HUP $MAINPID # Having non-zero Limit*s causes performance problems due to accounting overhead # in the kernel. We recommend using cgroups to do container-local accounting. LimitNOFILE=infinity LimitNPROC=infinity LimitCORE=infinity # Uncomment TasksMax if your systemd version supports it. # Only systemd 226 and above support this version. #TasksMax=infinity TimeoutStartSec=0 # set delegate yes so that systemd does not reset the cgroups of docker containers Delegate=yes # kill only the docker process, not all processes in the cgroup KillMode=process # restart the docker process if it exits prematurely Restart=on-failure StartLimitBurst=3 StartLimitInterval=60s [Install] WantedBy=multi-user.target 此处的--insecure-registry=127.0.0.1（此处改成你私服ip） 设置是针对有搭建了自己私服Harbor时允许docker进行不安全的访问，否则访问将会被拒绝。 chmod +x /etc/systemd/system/docker.service systemctl daemon-reload systemctl restart docker systemctl enable docker.service systemctl status docker
4、创建swarm集群管理
docker swarm init --advertise-addr 192.168.132.89（管理ip）
查看关联命令
docker swarm join-token worker
5、查看node服务
docker node ls
6、给集群命名并记录
docker node ls docker node update --label-add ng-node=node1 ID 获取配置信息（ip及node名称） docker inspect kj15q6np0pkgopvb8z7nn4p3h kj69dros9jbxbqsts8szhr7cc odjyiaqyli4aidp809oz1bqzp |grep -nE "Labels|Addr" -C 2 192.168.132.90 node1 192.168.132.91 node2 192.168.132.89 node3
7、创建bridge网络（实现容器服务互访）
docker network create \ --driver overlay \ --subnet 10.0.8.0/24 \ springcloud-overlay
8、docker service创建集群服务
创建服务 docker service create --name tomcat1 tomcat:latest 创建服务并指定端口 docker service create --name tomcat1 --publish 8080:8080 –v/webapps:/usr/local/tomcat/webapps tomcat:latest 创建服务并指定端口和挂载数据目录 docker service create --name tomcat_llplan --publish 8080:8080 --mount type=bind,src=/target,dst=/usr/tomcat/webapps zhjtomcat:V8080 创建服务并指定端口和挂载数据目录并指定网络 docker service create --name tomcat_llplan --publish 8080:8080 \ --mount type=bind,src=/target,dst=/usr/tomcat/webapps \ --network springcloud-overlay zhjtomcat:V8080
9、swarm图形化监控
docker pull dockersamples/visualizer:latest docker service create \ --name=viz \ --publish=8081:8080/tcp \ --constraint=node.role==manager \ --mount=type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \ dockersamples/visualizer:latest
10、查看容器服务状态
docker service ls
查看运行在那个节点上
docker service ps ID
11、查看容器服务配置详情
docker service ls
docker service inspect ID
12、容器pods伸缩
docker service ls
docker service scale <ID>=数量
13、重启指定容器服务
指定服务ID，重启所有容器
docker service ls
docker service update --force ID
14、日志检查
检查docker启动日志 docker logs -f CONTAINER ID journalctl -u docker.service systemctl status docker –l journalctl -xe 宿主机上查看容器应用日志 docker ps docker exec CONTAINER ID tail -f /usr/tomcat/logs/catalina.out