Redis master-slave replication structure mode, Sentinel mode
Set temporary effect
1. Configure Slave Library
192.168.4.58:6058> info replication //View master-slave configuration information
# Replication
role:master
connected_slaves:0
master_replid:784d7d32d7f522703ca763c6a1a4bb0f8c1db591
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
Command line specifies master library: SLAVEOF master library IP address Port number
2. One master and one slave
192.168.4.57:6057> 192.168.4.50 6050 #Slave library configuring 57 to 50
OK
192.168.4.57:6057> INFO replication
# Replication
role:slave
master_host:192.168.4.50
master_port:6050
master_link_status:up
master_last_io_seconds_ago:8
master_sync_in_progress:0
slave_repl_offset:56
client test
[root@51 ~]# redis-cli -c -h 192.168.4.50 -p 6050
192.168.4.50:6050> set name bob
OK
Master:
192.168.4.50:6050> keys *
1)"name"
2)192.168.4.57:6057> keys *
3)1) "name"
3. One master with multiple slaves (add 58 to the above)
192.168.4.58:6058> SLAVEOF 192.168.4.50 6050
OK
192.168.4.58:6058> info replication
# Replication
role:slave
master_host:192.168.4.50
...............
192.168.4.58:6058> keys *
1) "age"
2) "name"
4. Master slave (58 configured to become slave library of 57)
Just when we set 58 to 50 from the library, we need redis from Kai 58
[root@58 ~]# redis-cli -h 192.168.4.58 -p 6058 shutdown
[root@58 ~]# redis_6379 start
[root@58 ~]# redis-cli -h 192.168.4.58 -p 6058
192.168.4.58:6058> info replication
# Replication
role:master
connected_slaves:0
............
192.168.4.58:6058> SLAVEOF 192.168.4.57 6057
OK
192.168.4.58:6058> info replication
# Replication
role:slave
master_host:192.168.4.57
master_port:6057
Testing:
192.168.4.50(Master Library Slave Library 57)
192.168.4.50:6050> keys *
1) "age"
2) "name"
192.168.4.50:6050> set sex gral
OK
192.168.4.57(It is the slave library of 50 and the master library of 58)
192.168.4.57:6057> keys *
1) "sex"
2) "name"
3) "age"
192.168.4.58(57 from Library)
192.168.4.58:6058> keys *
1) "age"
2) "name"
3) "sex"
Reverse guest master-manually set slave to master after master outage
192.168.4.50 After downtime, manually set 57 as the master library
192.168.4.57:6057> SLAVEOF no one //Set as main library
OK
The above settings are temporary, restart invalid
Configure permanent master-slave synchronization with authentication (synchronization authentication requires entering the master library password)
1. set a password
[root@50 ~]# vim /etc/redis/6379.conf
501 requirepass 123456
8 REDISPORT="6050"
43 $CLIEXEC -h 192.168.4.50 -p $REDISPORT -a 123546 shutdown
2. from library settings
[root@57 redis]# vim /etc/redis/6379.conf
282 slaveof 192.168.4.50 6050
289 masterauth 123456
[root@57 redis]# redis-cli -h 192.168.4.57 -p 6057
192.168.4.57:6057> INFO replication
# Replication
role:slave
master_host:192.168.4.50
master_port:6050
master_link_status:up
...................................
Configure master-slave (configure 57 slave libraries permanently)
[root@58 ~]# redis-cli -h 192.168.4.58 -p 6058 shutdown
[root@58 ~]# vim /etc/redis/6379.conf
282 slaveof 192.168.4.57 6057
[root@58 ~]# redis_6379 start
[root@58 ~]# redis-cli -h 192.168.4.58 -p 6058
192.168.4.58:6058> info replication
# Replication
role:slave
master_host:192.168.4.57
master_port:6057
master_link_status:up
.............
sentry mode
- When the master database is down, the slave database is automatically upgraded to the master database.
- Edit the sentinel.conf file on the slave host
- Run sentinel on slave host
1. Write a configuration file under Rebase
Format: sentinel monitor host name ip address port votes
Host Name: Custom
IP address: IP address of master host
Port: Port used by master host redis service
Number of votes: After the main database is down, the host with more than 1 votes will be upgraded to the main database.
The production environment generally does not set the connection password
50 before downtime (cancel 51 password)
[root@50 ~]# vim /etc/redis/6379.conf
#requirepass 123456
Restart redis after setup
57 link 50 code cancelled
[root@57 ~]# vim /etc/redis/6379.conf
289 #masterauth 123456
Restart redis after setup
[root@57 redis]# vim /etc/sentinel.conf
sentinel monitor 50 192.168.4.50 6050 1
Sentinel auth-pass 50 123456 If master inventory is in secret, enter
[root@57 redis]# redis-sentinel /etc/sentinel.conf
[root@57 ~]# redis-cli -h 192.168.4.57 -p 6057
192.168.4.57:6057> info replication
# Replication
role:slave
master_host:192.168.4.50
master_port:6050
50 View after downtime
192.168.4.57:6057> info replication
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.4.58,port=6058,state=online,offset=10763,lag=1
.....................
