集群

[TOC] > [参考网址] ## 设置 host ``` # cat /etc/hosts 127.0.0.1 localhost 192.168.0.110 swarm01 192.168.0.111 swarm02 192.168.0.229 swarm03 ``` ## 在管理节点配置 ssh ``` # ssh-keygen -t rsa -P '' # ssh-copy-id -i .ssh/id_rsa.pub root@192.168.0.111 # ssh-copy-id -i .ssh/id_rsa.pub root@192.168.0.229 ``` 把管理节点生成的 ssh 发送到其他节点上 ## 安装 ansible 方便批量修改 ``` # yum -y install ansible # cat /etc/ansible/hosts | grep -v ^# | grep -v ^$ [node] 192.168.0.111 192.168.0.229 # sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config # ansible node -m copy -a 'src=/etc/selinux/config dest=/etc/selinux/" # 把修改好的文件发送到所有节点 # systemctl stop firewalld # 以下操作关闭防火墙, 也可根据实际需要开放端口 # systemctl disable firewalld # ansible node -a 'systemctl stop firewalld' # ansible node -a 'systemctl disable firewalld' ``` ## 创建 swarm 集群 ``` # docker swarm init --listen-addr 0.0.0.0 Swarm initialized: current node (a1tno675d14sm6bqlc512vf10) is now a manager. To add a worker to this swarm, run the following command: docker swarm join --token SWMTKN-1-3sp9uxzokgr252u1jauoowv74930s7f8f5tsmm5mlk5oim359e-dk52k5uul50w49gbq4j1y7zzb 192.168.139.175:2377 To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions. ``` ### 批量加入其他节点 ``` ansible node -a "docker swarm join --token SWMTKN-1-5h4qmjjt6kcioxzth5n4alf4dxmdz64a4m0f0ldqpl5lzzoct3-7jq900h8mg1recydraj91qgts 192.168.0.110:2377" ``` ### 查看节点 ``` # docker node ls ``` ## 安装 可视化 Portainer [Portainer 容器,集群可视化管理](Portainer%E5%AE%B9%E5%99%A8,%E9%9B%86%E7%BE%A4%E5%8F%AF%E8%A7%86%E5%8C%96%E7%AE%A1%E7%90%86.md) ``` docker volume create portainer_data \ && docker run -d -p 9000:9000 -p 8000:8000 \ --name portainer --restart always \ -v /var/run/docker.sock:/var/run/docker.sock \ -v portainer_data:/data portainer/portainer ``` 访问 9000 端口 ## 在Swarm中部署服务 ### 创建Hello服务，查看服务信息 ``` [root@master ~]# docker service create --replicas 1 --name hello busybox [root@master ~]# docker service ls ID NAME MODE REPLICAS IMAGE PORTS kosznwn4ombx hello replicated 0/1 busybox:latest ``` replicas 为0 说明服务未启动,因为他没有持续运行,busybox 只是个空容器 ``` docker service update --args "ping www.baidu.com" hello ```` 通过update 命令就可以让服务起来 ### 为服务扩容（缩融）scale ``` docker service scale hello=4 ``` ### 查看服务跑在哪些节点上 ``` [root@localhost ~]# docker service ps -f "desired-state=running" hello ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS pepfg0k9axvk hello.1 busybox:latest localhost Running Running 7 minutes ago 89k9sia7msej hello.2 busybox:latest swarm-master-172.18.0.1 Running Running 7 minutes ago 884jj15ta07i hello.3 busybox:latest swarm-node-123 Running Running 4 minutes ago pb1s5lrcxjm8 hello.4 busybox:latest swarm-node-123 Running Running 4 minutes ago # -f "desired-state=running" : 状态为runngin的服务 ``` ### 工作节点排除manager，manager只作为管理节点 上面中有管理节点做服务,去之 ``` docker node update --availability drain swarm-master-172.18.0.1 说明 # node update 节点名 ： 更改节点状态 # --availability : 三种状态 active: 正常 pause：挂起 drain：排除 ``` ### 滚动更新服务 ``` docker service create \ --replicas 3 \ --name redis \ --update-delay 10s \ redis:3.0.6 # 启动3个副本集的redis # update-delay 10s ：每个容器依次更新，间隔10s ``` 滚动升级redis `docker service update --image redis:3.0.7 redis `