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This article introduces the relevant knowledge of "how to achieve Redis master-slave replication". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Architecture

Master 192.168.2.222

From 192.168.2.187

From 192.168.2.188

Add from the library profile:

From 192.168.2.187

From 192.168.2.188

[root@rac1 config] # pwd

/ usr/local/redis/config

[root@rac1 config] # vim redis.conf

# add

Slaveof 192.168.2.222 6379

Restart the database

[root@rac1 config] # redis-cli-p 6379 shutdown

[root@rac1 config] # redis-server redis.conf

Verify data synchronization

Main library 2.222

[root@cjcos src] # redis-cli

127.0.0.1 purl 6379 > set station dba

OK

127.0.0.1 purl 6379 > get station

"dba"

From library 2.187

[root@rac1 config] # redis-cli

127.0.0.1 purl 6379 > get station

"dba"

From library 2.188

[root@rac2 config] # redis-cli

127.0.0.1 purl 6379 > get station

"dba"

The main library 2.222 views synchronization information

127.0.0.1 purl 6379 > info replication

# Replication

Role:master

Connected_slaves:2

Slave0:ip=192.168.2.187,port=6379,state=online,offset=11208,lag=1

Slave1:ip=192.168.2.188,port=6379,state=online,offset=11208,lag=1

Master_replid:231ff9d15411b50038a43bb0726580f4dd788f80

Master_replid2:0000000000000000000000000000000000000000

Master_repl_offset:11208

Second_repl_offset:-1

Repl_backlog_active:1

Repl_backlog_size:1048576

Repl_backlog_first_byte_offset:1

Repl_backlog_histlen:11208

Synchronization log

Main library 2.222

-redis.log

8511 M 23 Mar 2020 1415 53 51.841 * Background saving terminated with success

8511 Mar M 23 Mar 2020 1415 53 succeeded 51.842 * Synchronization with replica 192.168.2.187 succeeded

8511 Mar M 23 asks for synchronization 2020 1415 53 asks for synchronization * Replica 192.168.2.188 asks for synchronization

8511Viru M 23 Mar 2020 14purl 53 Mar 57.272 * Full resync requested by replica 192.168.2.188 Vol 6379

8511disk M 23 Mar 2020 1415 53 Mar 57.272 * disk

8511 M 23 Mar 2020 1415 53 57.272 * Background saving started by pid 8528

8528 C 23 Mar 2020 1415 53 57.326 * DB saved on disk

8528 Mar C 23 Mar 2020 1415 53 MB of memory used by copy-on-write 57.327 * RDB: 0

Frequently asked questions:

Synchronization failed. The log is as follows:

-redis.log

29884 S 23 Mar 2020 141450 29.152 * Connecting to MASTER 192.168.2.222

29884VOV S 23 Mar 2020 1450VOV 29.152 * MASTER REPLICA sync started

29884 S 23 Mar 2020 1450 29.152 *.

29884DENIED Redis is running in protected mode because protected mode is enabled S 23 Mar 2020 1450 DENIED Redis is running in protected mode because protected mode is enabled no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. If you want to connect'

Solution:

-profile redis.conf add:

Bind 0.0.0.0

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