The following additional configuration is required for Redis Sentinel.
In Redis, you need to specify a Redis master and as many Redis replicas as you require. An odd number of Redis Sentinel is required to make a quorum.
The following is an example of how to start and configure a Redis Sentinel that has a master on port 6741, 1 replica on port 6742 and 3 sentinels on ports 6800, 6801, and 6802.
To start the Redis master, on a command prompt, type:
redis-server.exe --port 6741 --protected-mode no --bind 0.0.0.0
To start the Redis replica, on a command prompt, type:
redis-server.exe redis_replica.conf
To start the 3 Redis sentinels, on a command prompt, type:
redis-server.exe sentinel-1.conf –-sentinel redis-server.exe sentinel-2.conf –-sentinel redis-server.exe sentinel-3.conf –-sentinel
In this case, your Redis master will be called MY_MASTER, this needs to be in uppercase. The following is an example of the content for the redis_replica.conf file. In the following configuration files, ensure that the text in bold is modified to reflect your requirements:
bind 0.0.0.0 port 6742 ## The port used by the replica. tcp-backlog 511 timeout 0 tcp-keepalive 0 loglevel notice logfile "" databases 16 save 900 1 save 300 10 save 60 10000 stop-writes-on-bgsave-error yes rdbcompression yes rdbchecksum yes dbfilename "dump.rdb" replicaof 127.0.0.1 6741 ## The port and IP used by the master replica-serve-stale-data yes replica-read-only yes repl-diskless-sync no repl-diskless-sync-delay 5 repl-disable-tcp-nodelay no replica-priority 100 appendonly no appendfilename "appendonly.aof" appendfsync everysec no-appendfsync-on-rewrite no auto-aof-rewrite-percentage 100 auto-aof-rewrite-min-size 64mb aof-load-truncated yes lua-time-limit 5000 slowlog-log-slower-than 10000 slowlog-max-len 128 latency-monitor-threshold 0 notify-keyspace-events "" hash-max-ziplist-entries 512 hash-max-ziplist-value 64 set-max-intset-entries 512 zset-max-ziplist-entries 128 zset-max-ziplist-value 64 hll-sparse-max-bytes 3000 activerehashing yes client-output-buffer-limit normal 0 0 0 client-output-buffer-limit replica 256mb 64mb 60 client-output-buffer-limit pubsub 32mb 8mb 60 hz 10 aof-rewrite-incremental-fsync yes
The content of the sentinel-1.conf, sentinel-2.conf, and sentinel-3.conf are the same except for the port. Modify the port to correspond to the port used by the appropriate sentinel:
port 6800 ## The port used by the sentinel sentinel monitor MY_MASTER 127.0.0.1 6741 ## The name, IP, and port used by the master. sentinel down-after-milliseconds MY_MASTER 5000 sentinel failover-timeout MY_MASTER 60000 sentinel parallel-syncs MY_MASTER 1
For the PAC configuration, in ESCWA, the SOR name must match the Redis master name MY_MASTER followed by all the sentinel IP and ports, for example:
set ES_SCALE_OUT_REPOS_1=MY_MASTER=redis,127.0.0.1:6800,127.0.0.1:6801,127.0.0.1:6802##TMP