1、概念
Docker Swarm 是 Docker 的集群管理工具。它將 Docker 主機池轉變為單個虛擬 Docker 主機。 Docker Swarm 提供了標准的 Docker API，所有任何已經與 Docker 守護程序通信的工具都可以使用 Swarm 輕松地擴展到多個主機。
2、拓撲圖
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 此處的--insecure-registry=127.0.0.1（此處改成你私服ip） 設置是針對有搭建了自己私服Harbor時允許docker進行不安全的訪問，否則訪問將會被拒絕。 chmod +x /etc/systemd/system/docker.service systemctl daemon-reload systemctl restart docker systemctl enable docker.service systemctl status docker
4、創建swarm集群管理
docker swarm init --advertise-addr 192.168.132.89（管理ip）
查看關聯命令
docker swarm join-token worker
5、查看node服務
docker node ls
6、給集群命名並記錄
docker node ls docker node update --label-add ng-node=node1 ID 獲取配置信息（ip及node名稱） 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、創建bridge網絡（實現容器服務互訪）
docker network create \ --driver overlay \ --subnet 10.0.8.0/24 \ springcloud-overlay
8、docker service創建集群服務
創建服務 docker service create --name tomcat1 tomcat:latest 創建服務並指定端口 docker service create --name tomcat1 --publish 8080:8080 –v/webapps:/usr/local/tomcat/webapps tomcat:latest 創建服務並指定端口和掛載數據目錄 docker service create --name tomcat_llplan --publish 8080:8080 --mount type=bind,src=/target,dst=/usr/tomcat/webapps zhjtomcat:V8080 創建服務並指定端口和掛載數據目錄並指定網絡 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圖形化監控
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、查看容器服務狀態
docker service ls
查看運行在那個節點上
docker service ps ID
11、查看容器服務配置詳情
docker service ls
docker service inspect ID
12、容器pods伸縮
docker service ls
docker service scale <ID>=數量
13、重啟指定容器服務
指定服務ID，重啟所有容器
docker service ls
docker service update --force ID
14、日志檢查
檢查docker啟動日志 docker logs -f CONTAINER ID journalctl -u docker.service systemctl status docker –l journalctl -xe 宿主機上查看容器應用日志 docker ps docker exec CONTAINER ID tail -f /usr/tomcat/logs/catalina.out