Redis高可用集群部署-Cluster

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Docker Swarm部署Redis-Cluster+Proxy实现容灾

Redis cluster是redis的官方集群方案，但是要求客户端自己做重定向，所以连接单机redis和集群redis的客户端会有些不同，连接集群版redis的时候要客户端连接6个redis实例。

官方为了屏蔽这种差异，做了一个redis-cluster-proxy，经过这个proxy的代理后，连接redis集群就和连接单机redis一样了。

RedisLabs/redis-cluster-proxy: A proxy for Redis clusters. (github.com)

image-20230203142147518

系统环境

集群规划

搭建3master+3slave+1proxy，共三个节点，如下：

IP hostname 部署实例
192.168.2.213 manager redis1、redis2、proxy(1实例)
192.168.2.214 worker1 redis3、redis4
192.168.2.215 worker2 redis5、redis5

查看系统版本

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[root@manager ~]# uname -a
Linux manager 3.10.0-957.el7.x86_64 #1 SMP Thu Nov 8 23:39:32 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
[root@manager ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

Docker

查看Docker版本

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[root@manager ~]# docker version
Client: Docker Engine - Community
 Version:           20.10.23
 API version:       1.41
 Go version:        go1.18.10
 Git commit:        7155243
 Built:             Thu Jan 19 17:36:21 2023
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.23
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.18.10
  Git commit:       6051f14
  Built:            Thu Jan 19 17:34:26 2023
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.15
  GitCommit:        5b842e528e99d4d4c1686467debf2bd4b88ecd86
 runc:
  Version:          1.1.4
  GitCommit:        v1.1.4-0-g5fd4c4d
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

防火墙

所有节点执行以下命令，打开集群初始化所需端口

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# 所有node
firewall-cmd --zone=public --add-port=2377/tcp --permanent
firewall-cmd --zone=public --add-port=7946/tcp --permanent
firewall-cmd --zone=public --add-port=7946/udp --permanent
firewall-cmd --zone=public --add-port=4789/tcp --permanent
firewall-cmd --zone=public --add-port=4789/udp --permanent

重启防火墙以及Docker

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# 所有node
firewall-cmd --reload
systemctl restart docker

Docker Swarm

创建3个manager节点，如下：

image-20230203101937613

manager节点初始化集群：

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docker swarm init --advertise-addr 192.168.2.213

manager节点获取加入manager token

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docker swarm join-token manager

worker节点以manager身份加入集群

docker swarm join \
--token SWMTKN-1-3pu6hszjas19xyp7ghgosyx9k8atbfcr8p2is99znpy26u2lkl-7p73s1dx5in4tatdymyhg9hu2 \
192.168.2.213:2377

系统部署

redis_cluster

部署准备

创建目录

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mkdir redis-cluster
cd redis-cluster

docker-compose.yml

编写docker-compose.yml文件，需要根据实际IP地址做调整

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vi docker-compose.yml

docker-compose.yml

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version: '3.7'
services:
  redis-node1:
    image: redis:6.2.4
    hostname: redis-node1
    ports:
      - 7001:6379
      - 17001:16379
    networks:
      - redis-swarm
    volumes:
      - "redis-node1-data:/data"
    command: 
      - "redis-server"
      - "--appendonly yes"
      - "--cluster-enabled yes"
      - "--cluster-config-file nodes.conf"
      - "--requirepass bb123456"
      - "--masterauth bb123456"
      - "--cluster-announce-ip 192.168.2.213"
      - "--cluster-announce-port 7001"
      - "--cluster-announce-bus-port 17001"
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints:
          - node.hostname == manager

  redis-node2:
    image: redis:6.2.4
    hostname: redis-node2
    ports:
      - 7002:6379
      - 17002:16379
    networks:
      - redis-swarm
    volumes:
      - "redis-node2-data:/data"
    command: 
      - "redis-server"
      - "--appendonly yes"
      - "--cluster-enabled yes"
      - "--cluster-config-file nodes.conf"
      - "--requirepass bb123456"
      - "--masterauth bb123456"
      - "--cluster-announce-ip 192.168.2.213"
      - "--cluster-announce-port 7002"
      - "--cluster-announce-bus-port 17002"
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints:
          - node.hostname == manager

  redis-node3:
    image: redis:6.2.4
    hostname: redis-node3
    ports:
      - 7003:6379
      - 17003:16379
    networks:
      - redis-swarm
    volumes:
      - "redis-node3-data:/data"
    command: 
      - "redis-server"
      - "--appendonly yes"
      - "--cluster-enabled yes"
      - "--cluster-config-file nodes.conf"
      - "--requirepass bb123456"
      - "--masterauth bb123456"
      - "--cluster-announce-ip 192.168.2.214"
      - "--cluster-announce-port 7003"
      - "--cluster-announce-bus-port 17003"
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints:
          - node.hostname == worker1

  redis-node4:
    image: redis:6.2.4
    hostname: redis-node4
    ports:
      - 7004:6379
      - 17004:16379
    networks:
      - redis-swarm
    volumes:
      - "redis-node4-data:/data"
    command: 
      - "--appendonly yes"
      - "--cluster-enabled yes"
      - "--cluster-config-file nodes.conf"
      - "--requirepass bb123456"
      - "--masterauth bb123456"
      - "--cluster-announce-ip 192.168.2.214"
      - "--cluster-announce-port 7004"
      - "--cluster-announce-bus-port 17004"
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints:
          - node.hostname == worker1

  redis-node5:
    image: redis:6.2.4
    hostname: redis-node5
    ports:
      - 7005:6379
      - 17005:16379
    networks:
      - redis-swarm
    volumes:
      - "redis-node5-data:/data"
    command: 
      - "--appendonly yes"
      - "--cluster-enabled yes"
      - "--cluster-config-file nodes.conf"
      - "--requirepass bb123456"
      - "--masterauth bb123456"
      - "--cluster-announce-ip 192.168.2.215"
      - "--cluster-announce-port 7005"
      - "--cluster-announce-bus-port 17005"
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints:
          - node.hostname == worker2

  redis-node6:
    image: redis:6.2.4
    hostname: redis-node6
    ports:
      - 7006:6379
      - 17006:16379
    networks:
      - redis-swarm
    volumes:
      - "redis-node6-data:/data"
    command: 
      - "--appendonly yes"
      - "--cluster-enabled yes"
      - "--cluster-config-file nodes.conf"
      - "--requirepass bb123456"
      - "--masterauth bb123456"
      - "--cluster-announce-ip 192.168.2.215"
      - "--cluster-announce-port 7006"
      - "--cluster-announce-bus-port 17006"
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints:
          - node.hostname == worker2

  redis-cluster:
    image: redis:6.2.4
    hostname: redis-cluster
    networks:
      - redis-swarm
    depends_on:
      - redis-node1
      - redis-node2
      - redis-node3
      - redis-node4
      - redis-node5
      - redis-node6
    command: 'redis-cli --cluster create
    192.168.2.213:7001 192.168.2.213:7002 192.168.2.214:7003
    192.168.2.214:7004 192.168.2.215:7005 192.168.2.215:7006
    --cluster-yes --cluster-replicas 1 -a bb123456'
    deploy:
      restart_policy:
        condition: on-failure
        delay: 5s
        max_attempts: 5
      placement:
        constraints:
          - node.hostname == manager

  redis-proxy:
    image: jontymax/redis-cluster-proxy:dev
    hostname: redis-proxy
    ports: 
      - "7777:7777"
    networks:
      - redis-swarm
    depends_on:
      - redis-cluster
    command: 'redis-cluster-proxy --auth bb123456 192.168.2.213:7001 192.168.2.213:7002 192.168.2.214:7003 192.168.2.214:7004 192.168.2.215:7005 192.168.2.215:7006'
    deploy:
      mode: global

networks:
  redis-swarm:
    driver: overlay

volumes:
  redis-node1-data:
  redis-node2-data:
  redis-node3-data:
  redis-node4-data:
  redis-node5-data:
  redis-node6-data:

服务部署

启动服务

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docker stack deploy -c docker-compose.yml redis-cluster-proxy

image-20230203145125983

查看服务

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docker service ls | grep redis-cluster

image-20230203145230510

redis-cluster服务用于初始化集群，启动完成日志如下:

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Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.2.214:7004 to 192.168.2.213:7001
Adding replica 192.168.2.215:7006 to 192.168.2.214:7003
Adding replica 192.168.2.213:7002 to 192.168.2.215:7005
M: 9ee907ba218b782c264be77e4dd5ca53a79b7350 192.168.2.213:7001
   slots:[0-5460] (5461 slots) master
S: 567cbca6ba03a2c4d1f4461882cf64a369daaafb 192.168.2.213:7002
   replicates 98719ee5734cdc8b9b06519e2ebcf23b66041266
M: c912e5bc90cdaed6159a5ca83725848556a8e68d 192.168.2.214:7003
   slots:[5461-10922] (5462 slots) master
S: 257d31f2f29f658103e9032584de8c2803bfb7b9 192.168.2.214:7004
   replicates 9ee907ba218b782c264be77e4dd5ca53a79b7350
M: 98719ee5734cdc8b9b06519e2ebcf23b66041266 192.168.2.215:7005
   slots:[10923-16383] (5461 slots) master
S: de5dbc1a51252d1c2ccf863470a85e5bd9e168bd 192.168.2.215:7006
   replicates c912e5bc90cdaed6159a5ca83725848556a8e68d
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
......
>>> Performing Cluster Check (using node 192.168.2.213:7001)
M: 9ee907ba218b782c264be77e4dd5ca53a79b7350 192.168.2.213:7001
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
M: c912e5bc90cdaed6159a5ca83725848556a8e68d 192.168.2.214:7003
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 567cbca6ba03a2c4d1f4461882cf64a369daaafb 192.168.2.213:7002
   slots: (0 slots) slave
   replicates 98719ee5734cdc8b9b06519e2ebcf23b66041266
S: 257d31f2f29f658103e9032584de8c2803bfb7b9 192.168.2.214:7004
   slots: (0 slots) slave
   replicates 9ee907ba218b782c264be77e4dd5ca53a79b7350
S: de5dbc1a51252d1c2ccf863470a85e5bd9e168bd 192.168.2.215:7006
   slots: (0 slots) slave
   replicates c912e5bc90cdaed6159a5ca83725848556a8e68d
M: 98719ee5734cdc8b9b06519e2ebcf23b66041266 192.168.2.215:7005
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

redis-proxy服务用于代理redis-cluster，等待redis-cluster初始化完成，启动完成日志如下：

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[2023-02-03 06:28:08.955/M] Redis Cluster Proxy v999.999.999 (unstable)
[2023-02-03 06:28:08.955/M] Commit: (ac83840d/0)
[2023-02-03 06:28:08.955/M] Git Branch: unstable
[2023-02-03 06:28:08.955/M] PID: 1
[2023-02-03 06:28:08.955/M] OS: Linux 3.10.0-957.el7.x86_64 x86_64
[2023-02-03 06:28:08.955/M] Bits: 64
[2023-02-03 06:28:08.955/M] Log level: info
[2023-02-03 06:28:08.955/M] Connections pool size: 10 (respawn 2 every 50ms if below 10)
[2023-02-03 06:28:08.955/M] The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
[2023-02-03 06:28:08.955/M] Listening on *:7777
[2023-02-03 06:28:08.955/M] Starting 8 threads...
[2023-02-03 06:28:08.955/M] Fetching cluster configuration...
[2023-02-03 06:28:08.962/M] Cluster Address: 192.168.2.213:7001
[2023-02-03 06:28:08.962/M] Cluster has 3 masters and 3 replica(s)
[2023-02-03 06:28:09.057/M] All thread(s) started!

如果初始化或代理启动失败，可以尝试移除服务重新创建

移除服务

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docker stack rm redis-cluster

服务连接

连接到集群

连接任意节点IP:700x可连接到集群

image-20230203145831336

可正常使用

image-20230203150113829

查看集群节点信息

image-20230203150222570

连接到代理

image-20230203145814034

image-20230203150312909

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