Redis master-slave configuration and Sentinel Construction

As one of the mainstream nosql database products, redis is widely used. This article introduces the master-slave configuration method and

As one of the mainstream nosql database products, redis is widely used. This article introduces the master-slave configuration method and

As one of the mainstream nosql database products, redis is widely used. This article describes the master-slave configuration method of redis and how to ensure high availability and automatic failover of redis.

As follows:
Environment Description:
Server: CentOS 6.5X64
Redis Software Description: 2.8.19
I. Configure Master/Slave redis
1. Architecture:
Master Database: 172.16.52.130
Slave database 1: 172.16.52.131
Slave database 2: 172.16.52.132
2. Master-slave operations:
Tar xvf redis-2.8.19.tar.gz-C/usr/local
Cd/usr/local/redis-2.8.19/

Make & make install

Mkdir data
Vim redis. conf

---
# Add the following command directly at the end
Aof-rewrite-incremental-fsync yes
Daemonize yes
Logfile/var/log/redis. log
Syslog-enabled no
Dir/usr/local/redis-2.8.19/data
Requirepass system # configure the master and slave nodes for the following sentinel preparations

Slaveof 172.16.52.130 6379 # Add the configuration from the slave database. This configuration is not added to the master database.
Masterauth system # configure the master and slave nodes for the following sentinel preparations
# The above passwords must be the same. If they are both set, they are not set.
---
3. Start and Stop a database
Start: redis-server/usr/local/redis. conf
Close: redis-cli-a system shutdown
Notes:
1) the master does not need to set the login password, so the slave does not need to set masterauth
2) When the master does not set the logon password, the command to shut down is redis-cli shutdown.
4. Test
Redis-cli-a system
Info
---
Slave0: ip = 172.16.52.131, port = 6379, state = online, offset = 211171, lag = 0
Slave1: ip = 172.16.52.130, port = 6379, state = online, offset = 211171, lag = 1
---
At the same time, you can perform a data test: Create and insert data on the master database to check whether the slave database is synchronized.
Ii. Configure sentinel
Vim/etc/sentinel. conf

---
Port 26379
Daemonize yes
Logfile "/var/log/sentinel. log"
Sentinel monitor mymaster 172.16.52.132 6379 1
Sentinel down-after-milliseconds MySQL master 3000
Sentinel failover-timeout MySQL master 10000
Sentinel auth-pass mymaster system # This verification password is consistent with the master-slave password above. If the master-slave password is not set, this section is not required.
---
Start and Stop sentinel
Redis-sentinel/etc/sentinel. conf
Redis-cli-p 26379 shutdown
View logs:
Tail-f/var/log/sentinel. log
[24259] 27 Apr 16:42:58. 280 # Sentinel runid is f6688a7526b2b5f3298dc0c5348ae78207f1c1be
[24259] 27 Apr 16:42:58. 280 # + monitor master mymaster 172.16.52.130 6379 quorum 1
[24259] 27 Apr 16:42:58. 280 * + slave 172.16.52.132: 6379 172.16.52.132 6379 @ mymaster 172.16
.. 52.130 6379
[24259] 27 Apr 16:42:58. 280 * + slave 172.16.52.131: 6379 172.16.52.131 6379 @ mymaster 172.16
.. 52.130 6379
To ensure high availability of redis and make sentinel meaningful, select at least two or more sentinel servers. Generally, we recommend that you use three servers to ensure the voting mechanism.

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