Redis master-slave configuration and sentinel mode

Master slave configuration

1. redis edition ：6.2.6
2. With 1 Console host ,2 Take a slave as an example .

Preparing for basic redis To configure

Create directory /opt/myredis, Replication based redis.conf This directory , And make changes .

#  close AOF function 
appendonly no

Configure host information

New file ：redis6379.conf, Add content

#  Appoint include In the current directory redis.conf
include /opt/myredis/redis.conf
pidfile /var/run/redis_6379.pid
port 6379
dbfilename dump6379.rdb

To configure 2 Slave information

create a file ：redis6380.conf, Add content

include /opt/myredis/redis.conf
pidfile "/var/run/redis_6380.pid"
port 6380
dbfilename "dump6380.rdb"

create a file ：redis6381.conf, Add content

include /opt/myredis/redis.conf
pidfile "/var/run/redis_6381.pid"
port 6381
dbfilename "dump6381.rdb"

Start three redis

redis-server /opt/myredis/redis6379.conf
redis-server /opt/myredis/redis6380.conf
redis-server /opt/myredis/redis6381.conf

Batch close redis-server

ps -ef | grep -v grep | grep redis |  awk -F' ' '{print $2}' | xargs kill -9

Check the status

First connect to redis

redis-cli -p 6379

-p: Specify to connect to redis Which port of

stay redis-cli Use the command to view the status

info replication

Connect to 3 individual redis System , Check the status separately , You can see that every redis-server Of role All are master.

Set the slave as the master slave

stay 6380 and 6381 Of redis Execute commands respectively in , take 6379 Port of redis Set to master.

slaveof 127.0.0.1 6379

#  When you are no longer a slave , Use command 
slaveof no one

Review status

Re execute on the client of each port ：info replication command

1. You can see 6379 Port of redis Still master, There are two slave.
2. 6380 and 6380 Port of redis Of role Turn into slave.

Sentinel mode sentinel

To configure

stay /opt/myredis Create document under ：sentinel.conf, And add content

daemonize yes 
#  Sentinel port , Default 26379
# port 7505
#  Log files  
logfile "./sentinel.log" 

# sentinel monitor  Primary node alias    Master node IP   port    Number of sentinels （ Several sentinels monitor that the master node is down and perform the transfer ）
sentinel monitor mymaster 192.168.10.102 6379 1

#  sentry 3s The heartbeat of the master node is not received in , It is considered that the primary node is down , Default 30 second   
sentinel down-after-milliseconds mymaster 3000

#  After electing a new master node , The number of slave nodes that can be connected at the same time 
# sentinel parallel-syncs mymaster 1

#  If 10 Seconds later ,master Still not alive , Start up failover, Default 180s  
# sentinel failover-timeout mymaster 10000 

#  Connect redis Master password   
# sentinel auth-pass mymaster 123456  

start-up

Carry out orders

redis-sentinel /opt/myredis/sentinel.conf

You can see the response output information ,sentinel Default port 26379.

here , Try turning it off 6379 Port of redis after , You can see sentinel Log output , And elect a new host .