docker搭建redis主從哨兵集群的實現(xiàn)步驟
本文以docker-compose 搭建高可用Redis 主從、哨兵集群為例子
關(guān)于redis主從,哨兵集群原理參見:Redis 單機安裝/ 哨兵模式集群安裝
1:獲取redis鏡像
docker pull redis:6.2.7
2:創(chuàng)建redis主從+哨兵docker-compose文件
cd /opt/docker/redis vi docker-compose.yml
docker-compose.yml的內(nèi)容如下
version: '3' services: master: image: redis:6.2.7 ## 鏡像 container_name: redis-master command: redis-server /etc/redis/redis.conf --requirepass 123456 --masterauth 123456 volumes: - /opt/docker/redis/data/redis_data1:/data - /opt/docker/redis/conf/redis1.conf:/etc/redis/redis.conf network_mode: "host" slave1: image: redis:6.2.7 ## 鏡像 container_name: redis-slave-1 volumes: - /opt/docker/redis/data/redis_data2:/data - /opt/docker/redis/conf/redis2.conf:/etc/redis/redis.conf command: redis-server /etc/redis/redis.conf --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456 depends_on: - master network_mode: "host" slave2: image: redis:6.2.7 ## 鏡像 container_name: redis-slave-2 volumes: - /opt/docker/redis/data/redis_data3:/data - /opt/docker/redis/conf/redis3.conf:/etc/redis/redis.conf command: redis-server /etc/redis/redis.conf --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456 depends_on: - master network_mode: "host" sentinel1: image: redis:6.2.7 ## 鏡像 container_name: redis-sentinel-1 command: redis-sentinel /usr/local/etc/redis/sentinel.conf volumes: - /opt/docker/redis/conf/sentinel1.conf:/usr/local/etc/redis/sentinel.conf network_mode: "host" depends_on: - master - slave1 - slave2 sentinel2: image: redis:6.2.7 ## 鏡像 container_name: redis-sentinel-2 command: redis-sentinel /usr/local/etc/redis/sentinel.conf volumes: - /opt/docker/redis/conf/sentinel2.conf:/usr/local/etc/redis/sentinel.conf network_mode: "host" depends_on: - master - slave1 - slave2 sentinel3: image: redis:6.2.7 ## 鏡像 container_name: redis-sentinel-3 command: redis-sentinel /usr/local/etc/redis/sentinel.conf volumes: - /opt/docker/redis/conf/sentinel3.conf:/usr/local/etc/redis/sentinel.conf network_mode: "host" depends_on: - master - slave1 - slave2
3:redis配置和哨兵配置說明
查看配置文件的目錄樹
cd /opt/docker/redis tree ./
結(jié)構(gòu)如下
redis1.conf,redis2.conf,redis3.conf配置如下
#redis1.conf bind 0.0.0.0 port 6379 protected-mode no slave-read-only no #redis2.conf bind 0.0.0.0 port 6380 protected-mode no slave-read-only no #redis3.conf bind 0.0.0.0 port 6381 protected-mode no slave-read-only no
sentinel1.conf,sentinel1.conf,sentinel1.conf配置:
#sentinel1.conf port 26379 dir /tmp sentinel monitor mymaster 192.168.18.131 6379 2 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 30000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 10000 sentinel deny-scripts-reconfig yes #sentinel2.conf port 26380 dir /tmp sentinel monitor mymaster 192.168.18.131 6379 2 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 30000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 10000 sentinel deny-scripts-reconfig yes #sentinel3.conf port 26381 dir /tmp sentinel monitor mymaster 192.168.18.131 6379 2 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 30000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 10000 sentinel deny-scripts-reconfig yes
說明:
【sentinel monitor mymaster 192.168.18.131 6379 2】192.168.18.131為服務(wù)器的IP地址,6379為redis master的端口號
【sentinel auth-pass mymaster 123456】設(shè)置主節(jié)點的密碼
【sentinel down-after-milliseconds mymaster 30000】表示在一段時間范圍內(nèi)sentinel向master發(fā)送的心跳PING沒有回復(fù)則認為master不可用了。
【sentinel parallel-syncs mymaster 1】的parallel-syncs表示設(shè)置在故障轉(zhuǎn)移之后,同時可以重新配置使用新master的slave的數(shù)量。數(shù)字越低,更多的時間將會用故障轉(zhuǎn)移完成,但是如果slaves配置為服務(wù)舊數(shù)據(jù),你可能不希望所有的slave同時重新同步master。因為主從復(fù)制對于slave是非阻塞的,當(dāng)停止從master加載批量數(shù)據(jù)時有一個片刻延遲。通過設(shè)置選項為1,確信每次只有一個slave是不可到達的。
【sentinel failover-timeout mymaster 10000 】表示10秒內(nèi)mymaster還沒活過來,則認為master宕機了。
redis_data1,redis_data2,redis_data3為空文件夾,用于存放redis數(shù)據(jù)文件
4:啟動docker-compose
docker-compose up #或者,后臺啟動 docker-compose up -d
5:查看啟動情況
6:進入主節(jié)點查看集群情況
docker exec -it 主節(jié)點容器id或者容器名稱 bash redis-cli -p 6379 info replication
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