# 高可用配置搭配Sentinel机制
---> Redis (Replica)
client ---> Redis (Master)
---> Redis (Replica)
-------------------------------------------------
sentinel
# 高可用配置搭配Sentinel丛集架构
---> Redis (Replica)
client ---> Redis (Master)
---> Redis (Replica)
-------------------------------------------------
sentinel sentinel sentinel
# 复制三份设定档,结尾用Port命名
cp sentinel_26379.conf sentinel_26380.conf
cp sentinel_26379.conf sentinel_26381.conf
# 修改各个设定档中的port与monitor需要设定成2,搭配目前redis server (Master) 127.0.0.1 6380
# sentinel_26379.conf
vi sentinel_26379.conf
port 26379
daemonize yes
logfile "/tmp/redis-sentinel_26379.log"
dir "/tmp"
sentinel monitor mymaster 127.0.0.1 6380 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
# sentinel_26380.conf
vi sentinel_26380.conf
port 26380
daemonize yes
logfile "/tmp/redis-sentinel_26380.log"
dir "/tmp"
sentinel monitor mymaster 127.0.0.1 6380 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
# sentinel_26381.conf
vi sentinel_26381.conf
port 26381
daemonize yes
logfile "/tmp/redis-sentinel_26381.log"
dir "/tmp"
sentinel monitor mymaster 127.0.0.1 6380 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
# 启动三个sentinel
./redis-sentinel sentinel_26379.conf
./redis-sentinel sentinel_26380.conf
./redis-sentinel sentinel_26381.conf
# 确认是否正常运作
ps -ef|grep redis-se
为什麽sentinel monitor 组态需要特别设定2个以上(多数) 的sentinel才可以决定选出新的Redis Server 的Master,因为有可能因爲网路的延迟造成某个sentinel监控Redis Server Master时发生误判,进而直接就切换到了别台Redis Master.
Master离线机制
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