What is the meaning of master-slave replication in Redis

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Master-slave replication:

1. Master can have multiple slave.

2. Multiple slave can connect not only to the same master, but also to other slave.

3. Master-slave replication will not block master, and master can continue to process client requests when synchronizing data.

4. Improve the scalability of the system.

Master-slave replication process:

1. Slave establishes a connection with master and sends sync synchronization commands.

2. Master will start a background process to save the database snapshot to a file, while the master main process will start collecting new write commands and caching them.

3. After the background has finished saving, send this file to slave.

4. Slave saves the secondary file to the hard disk.

Configure the master and slave servers:

You only need to add the following configuration to the configuration file of slave:

[root@D2-TRAIN15 redis-4.0.1] # egrep "slaveof | masterauth" redis.conf

# Master-Slave replication. Use slaveof to make a Redis instance a copy of

Slaveof # specifies the IP and port of the master.

Masterauth # specifies the password for master.

Modify the configuration file of the slave server:

[root@D2-TRAIN15 redis-4.0.1] # egrep "slaveof | masterauth" redis.conf

# Master-Slave replication. Use slaveof to make a Redis instance a copy of

Slaveof 10.163.89.245 6379

Masterauth 123456

[root@D2-TRAIN15 redis-4.0.1] # src/redis-server redis.conf

[root@D2-TRAIN15 redis-4.0.1] # src/redis-cli

127.0.0.1 purl 6379 > info replication

# Replication

Role:slave

Master_host:10.163.89.245

Master_port:6379

Master_link_status:up

Master_last_io_seconds_ago:1

View the main library:

127.0.0.1 purl 6379 > info replication

# Replication

Role:master

Connected_slaves:1

Slave0:ip=10.163.89.15,port=6379,state=online,offset=154,lag=1

Test:

Main library:

127.0.0.1 purl 6379 > set name master

OK

From the library:

127.0.0.1 purl 6379 > get name

"master"

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