在docker swarm中的Redis sentinel故障转移配置

时间:2018-05-09 15:27:51

标签: docker redis docker-swarm redis-sentinel

描述

我试图在docker swarm中创建一个Redis群集。我使用bitnami-redis-docker图片创建了我的容器。通过bitnami文档,他们总是建议使用1个主节点而不是阅读Redis文档,该文档指出应该至少有3个主节点,这就是为什么我对哪一个是正确的感到困惑。鉴于所有bitnami slave默认为只读,如果我在其中一个swarm leader节点中只设置了一个master,如果它失败了,我相信sentinel将尝试将不同的slave redis实例作为master提升,但鉴于它只读是所有写操作都会失败。如果我改变它以使主redis实例为global意味着它将在群中可用的所有节点中创建,在这种情况下我是否需要哨兵?此外,如果以下设置是好的,是否有理由引入负载均衡器?

设置

+------------------+ +------------------+ +------------------+ +------------------+
| Node-1           | | Node-2           | | Node-3           | | Node-4           |     
| Leader           | | Worker           | | Leader           | | Worker           |
+------------------+ +------------------+ +------------------+ +------------------+
|  M1              | | M2               | | M3               | | M4               |
|  R1              | | R2               | | R3               | | R4               |
|  S1              | | S2               | | S3               | | S4               |
|                  | |                  | |                  | |                  |
+------------------+ +------------------+ +------------------+ +------------------+

传奇 -

  • 大师称为M1,M2,M3,......,Mn
  • 奴隶称为R1,R2,R3,...,Rn(R代表复制品)。
  • 哨兵称为S1,S2,S3,......,Sn

泊坞

version: '3'

services:
  redis-master:
    image: 'bitnami/redis:latest'
    ports:
      - '6379:6379'
    environment:
      - REDIS_REPLICATION_MODE=master
      - REDIS_PASSWORD=laSQL2019
      - REDIS_EXTRA_FLAGS=--maxmemory 100mb
    volumes:
      - 'redis-master-volume:/bitnami'
    deploy:
      mode: global

  redis-slave:
    image: 'bitnami/redis:latest'
    ports:
      - '6379'
    depends_on:
      - redis-master
    volumes:
      - 'redis-slave-volume:/bitnami'
    environment:
      - REDIS_REPLICATION_MODE=slave
      - REDIS_MASTER_HOST=redis-master
      - REDIS_MASTER_PORT_NUMBER=6379
      - REDIS_MASTER_PASSWORD=laSQL2019
      - REDIS_PASSWORD=laSQL2019
      - REDIS_EXTRA_FLAGS=--maxmemory 100mb
    deploy:
      mode: replicated
      replicas: 4

  redis-sentinel:
    image: 'bitnami/redis:latest'
    ports:
      - '16379'
    depends_on:
      - redis-master
      - redis-slave
    volumes:
      - 'redis-sentinel-volume:/bitnami'
    entrypoint: |
      bash -c 'bash -s <<EOF
      "/bin/bash" -c "cat <<EOF > /opt/bitnami/redis/etc/sentinel.conf
      port 16379
      dir /tmp
      sentinel monitor master-node redis-master 6379 2
      sentinel down-after-milliseconds master-node 5000
      sentinel parallel-syncs master-node 1
      sentinel failover-timeout master-node 5000
      sentinel auth-pass master-node laSQL2019
      sentinel announce-ip redis-sentinel
      sentinel announce-port 16379
      EOF"     
      "/bin/bash" -c "redis-sentinel /opt/bitnami/redis/etc/sentinel.conf"    
      EOF'
    deploy:
      mode: global

volumes:
  redis-master-volume:
    driver: local
  redis-slave-volume:
    driver: local
  redis-sentinel-volume:
    driver: local

1 个答案:

答案 0 :(得分:3)

bitnami解决方案是故障转移解决方案,因此它有一个主节点

Sentinel是一种HA解决方案,即自动故障转移。但它不提供跨多个节点的数据分布的可扩展性。如果您想要分片&#39;您需要设置群集。除了&#39; HA&#39;。