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docker swarm快速部署redis分布式集群

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環境準備四臺虛擬機

  • 192.168.2.38（管理節點）
  • 192.168.2.81（工作節點）
  • 192.168.2.100（工作節點）
  • 192.168.2.102（工作節點）
時間同步每臺機器都執行
yum install -y ntpcat <<EOF>>/var/spool/cron/root00 12 * * * /usr/sbin/ntpdate -u ntp1.aliyun.com && /usr/sbin/hwclock -wEOF##查看計劃任務crontab -l##手動執行/usr/sbin/ntpdate -u ntp1.aliyun.com && /usr/sbin/hwclock -wDocker安裝Dockercurl -sSL https://get.daocloud.io/docker | sh啟動dockersudo systemctl start docker搭建Swarm集群打開防火墻(Swarm需要)
  • 管理節點打開2377
    # managerfirewall-cmd --zone=public --add-port=2377/tcp --permanent
  • 所有節點打開以下端口
    # 所有nodefirewall-cmd --zone=public --add-port=7946/tcp --permanentfirewall-cmd --zone=public --add-port=7946/udp --permanentfirewall-cmd --zone=public --add-port=4789/tcp --permanentfirewall-cmd --zone=public --add-port=4789/udp --permanent
  • 所有節點重啟防火墻
    【docker swarm快速部署redis分布式集群】# 所有nodefirewall-cmd --reloadsystemctl restart docker
  • 圖個方便可以直接關閉防火墻
創建Swarmdocker swarm init --advertise-addr your_manager_ip查看join-token
[root@manager ~]# docker swarm join-token workerTo add a worker to this swarm, run the following command:docker swarm join --token SWMTKN-1-51b7t8whxn8j6mdjt5perjmec9u8qguxq8tern9nill737pra2-ejc5nw5f90oz6xldcbmrl2ztu 192.168.2.61:2377[root@manager ~]#加入Swarmdocker swarm join --token SWMTKN-1-51b7t8whxn8j6mdjt5perjmec9u8qguxq8tern9nill737pra2-ejc5nw5f90oz6xldcbmrl2ztu192.168.2.38:2377#查看節點docker node ls服務約束添加label
sudo docker node update --label-add redis1=true 管理節點名稱sudo docker node update --label-add redis2=true 工作節點名稱sudo docker node update --label-add redis3=true 工作節點名稱sudo docker node update --label-add redis4=true 工作節點名稱單機集群
弊端：容器都部署在一個機器上，機器掛了，就全掛了 。
創建容器Tips：這里可以寫個腳本啟動，因為這種方式不常用，這里就不寫那個腳本了
docker create --name redis-node1 --net host -v /data/redis-data/node1:/data redis --cluster-enabled yes --cluster-config-file nodes-node-1.conf --port 6379docker create --name redis-node2 --net host -v /data/redis-data/node2:/data redis --cluster-enabled yes --cluster-config-file nodes-node-2.conf --port 6380docker create --name redis-node3 --net host -v /data/redis-data/node3:/data redis --cluster-enabled yes --cluster-config-file nodes-node-3.conf --port 6381docker create --name redis-node4 --net host -v /data/redis-data/node4:/data redis --cluster-enabled yes --cluster-config-file nodes-node-4.conf --port 6382docker create --name redis-node5 --net host -v /data/redis-data/node5:/data redis --cluster-enabled yes --cluster-config-file nodes-node-5.conf --port 6383docker create --name redis-node6 --net host -v /data/redis-data/node6:/data redis --cluster-enabled yes --cluster-config-file nodes-node-6.conf --port 6384啟動容器docker start redis-node1 redis-node2 redis-node3 redis-node4 redis-node5 redis-node6進入容器啟動集群# 進入其中一個節點docker exec -it redis-node1 /bin/bash# 創建集群redis-cli --cluster create 192.168.2.38:6379 192.168.2.38:6380 192.168.2.38:6381 192.168.2.38:6382 192.168.2.38:6383 192.168.2.38:6384 --cluster-replicas 1# --cluster-replicas 1 一比一，一主一從分布式集群
redis集群至少需要3個主節點，所以這里搭建三主三從的集群，由于只有4臺機器 ， 所以在腳本中把前三個節點放到一臺機器上了 。
部署在swarm集群的Manager節點中創建
mkdir /root/redis-swarmcd /root/redis-swarmvi docker-compose.ymldocker compose.yml說明：
  1. 前6個服務為redis節點，最后一個redis-start是用于創建集群，利用redis-cli客戶端搭建集群 ， 該服務搭建完redis集群后會自動停止運行 。
  2. redis-start需要等待前6個redis節點的執行完畢才能創建集群，因此需要用到腳本wait-for-it.sh
  3. 由于redis-cli --cluster create不支持網絡別名，所以另寫腳本redis-start.sh
使用這套腳本同樣可以單機部署集群 ， 只需要在啟動時不使用swarm啟動就可以了 ， 然后把docker-compose.yml中的網絡模式driver: overlay給注釋掉即可
version: '3.7'services:redis-node1:image: redishostname: redis-node1ports:- 6379:6379networks:- redis-swarmvolumes:- "node1:/data"command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-1.confdeploy:mode: replicatedreplicas: 1resources:limits:# cpus: '0.001'memory: 5120Mreservations:# cpus: '0.001'memory: 512Mplacement:constraints:- node.role==managerredis-node2:image: redishostname: redis-node2ports:- 6380:6379networks:- redis-swarmvolumes:- "node2:/data"command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-2.confdeploy:mode: replicatedreplicas: 1resources:limits:# cpus: '0.001'memory: 5120Mreservations:# cpus: '0.001'memory: 512Mplacement:constraints:- node.role==managerredis-node3:image: redishostname: redis-node3ports:- 6381:6379networks:- redis-swarmvolumes:- "node3:/data"command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-3.confdeploy:mode: replicatedresources:limits:# cpus: '0.001'memory: 5120Mreservations:# cpus: '0.001'memory: 512Mreplicas: 1placement:constraints:- node.role==managerredis-node4:image: redishostname: redis-node4ports:- 6382:6379networks:- redis-swarmvolumes:- "node4:/data"command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-4.confdeploy:mode: replicatedreplicas: 1resources:limits:# cpus: '0.001'memory: 5120Mreservations:# cpus: '0.001'memory: 512Mplacement:constraints:- node.labels.redis2==trueredis-node5:image: redishostname: redis-node5ports:- 6383:6379networks:- redis-swarmvolumes:- "node5:/data"command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-5.confdeploy:mode: replicatedreplicas: 1resources:limits:# cpus: '0.001'memory: 5120Mreservations:# cpus: '0.001'memory: 512Mplacement:constraints:- node.labels.redis3==trueredis-node6:image: redishostname: redis-node6ports:- 6384:6379networks:- redis-swarmvolumes:- "node6:/data"command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-6.confdeploy:mode: replicatedreplicas: 1resources:limits:# cpus: '0.001'memory: 5120Mreservations:# cpus: '0.001'memory: 512Mplacement:constraints:- node.labels.redis4==trueredis-start:image: redishostname: redis-startnetworks:- redis-swarmvolumes:- "$PWD/start:/redis-start"depends_on:- redis-node1- redis-node2- redis-node3- redis-node4- redis-node5- redis-node6command: /bin/bash -c "chmod 777 /redis-start/redis-start.sh && chmod 777 /redis-start/wait-for-it.sh && /redis-start/redis-start.sh"deploy:restart_policy:condition: on-failuredelay: 5smax_attempts: 5placement:constraints:- node.role==managernetworks:redis-swarm:driver: overlayvolumes:node1:node2:node3:node4:node5:node6:

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