How to build a redis replication cluster

Environment preparation

1. Server (or cloud server) based on centos7 system;

2.Redis installation package

Building process

Due to Due to resource limitations, this article will be built on a server and distinguished by different port numbers;

1. Upload the redis installation package to the specified directory (and decompress it)

2. Create three directories in the current directory.

In the current directory, create three file directories: 7001, 7002, and 7003.

3. Copy the redis.conf configuration file under the redis decompression package to three directories respectively

4. Modify the default port number of each configuration file and the data storage directory

You can use the sed command for batch replacement and modification

sed -i -e 's/6379/7001/g' -e 's/dir .\//dir \/tmp\/7001\//g' 7001/redis.conf
sed -i -e 's/6379/7002/g' -e 's/dir .\//dir \/tmp\/7002\//g' 7002/redis.conf
sed -i -e 's/6379/7003/g' -e 's/dir .\//dir \/tmp\/7003\//g' 7003/redis.conf

After the modification is completed, we may wish to view any configuration file,

5. Modify the declared IP of each instance

The virtual machine itself has multiple IPs. In order to avoid future confusion, the binding IP information of each instance needs to be specified in the redis.conf file. The format is as follows:

replica-announce -ip The current IP

can still be edited by batch modification

sed -i '1a replica-announce-ip 当前IP' 7001/redis.conf
sed -i '1a replica-announce-ip 当前IP' 7002/redis.conf
sed -i '1a replica-announce-ip 当前IP' 7003/redis.conf

After the modification is completed, you can confirm it with the following command

The modification of the above configuration files is basically completed

6. Cluster startup

Start 3 instances respectively , the startup process is as follows:

7001 instance:

##7002 instance:

7003 instance:

printf '%s\n' 7001 7002 7003 | xargs -I{} -t redis-cli -p {} shutdown

7. Configure the master-slave relationship between three instances

There are two modes: temporary and permanent:

• Modify the configuration file (permanent) and add a line of configuration in redis.conf: slaveof ;

• Use the redis-cli client to connect to the redis service and execute the slaveof command (it will become invalid after restarting): slaveof ;

redis-cli -p 7002

SLAVEOF 127.0.0.1 7001

8. Cluster test

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