Shulou(Shulou.com)06/01 Report--

redis master-slave synchronization principle

During the synchronization process,

The master creates the RDB file only on the first synchronization and uses it as a base for synchronization.

All subsequent synchronizations are performed by incremental command transfer (AOF).

Environment Description:

master: 192.168.2.100 Do not open RDB and AOF

slave: 192.168.2.200 Open RDB and AOF

Configuration information:

master：

# vim etc/redis.conf

#save 600 5 //disable RDB

appendonly no //disable AOF

requirepass 123456 //Specify authentication password

slave：

# vim etc/redis.conf

save 600 5 //disable RDB

appendonly yes //disable AOF

appendfilename "appendonly.aof" //Specify an AOF file

appendfsync everysec //Force writes to disk once per second

no-appendfsync-on-rewrite no //command appends are not performed during log rewriting

auto-aof-rewrite-percentage 100 //overwrite when current AOF exceeds previous AOF size by 100%

auto-aof-rewrite-min-size 64mb //log rewrite minimum

slaveof 192.168.2.100 6379 //Specify main library IP and port

masterauth 123456 //Specify the login password for the master library

Start redis:

master：# redis-server etc/redis.conf

slave：# redis-server etc/redis.conf

Observe synchronization:

master：

# redis-cli -a 123456

127.0.0.1: 6379> info replication //Check whether the master-slave relationship is correct

127.0.0.1: 6379> keys * //At this time, there is no RDB file in the master installation directory.

(empty list or set)

127.0.0.1:6379> set name zhagnsan //create key

OK

# ll /usr/local/redis-3.0.6-6379 //generate an RDB file to use as a basis for synchronization with slave

-rw-r--r-- 1 root root 35 May 20 21:59 dump_6379.rdb

slave：

# redis-cli

127.0.0.1: 6379> info replication //Check whether the master-slave relationship is correct

127.0.0.1: 6379> keys * //data synchronized

1) "name"

127.0.0.1:6379> get name

"zhagnsan"

# ll /usr/local/redis-3.0.6-6379 //directory to generate RDB files and AOF files

-rw-r--r-- 1 root root 60 May 20 21:59 appendonly.aof

-rw-r--r-- 1 root root 18 May 20 21:58 dump.rdb

master：

# redis-cli -a 123456

127.0.0.1:6379> set age 26 //add 2 keys

OK

127.0.0.1:6379> set home beijing

OK

# ll /usr/local/redis-3.0.6-6379 //RDB file size unchanged

-rw-r--r-- 1 root root 35 May 20 21:59 dump_6379.rdb

slave：

# redis-cli

127.0.0.1: 6379> keys * //data synchronized

1) "age"

2) "name"

3) "home"

# ll /usr/local/redis-3.0.6-6379 //Discovery: RDB file size unchanged, only AOF changed

-rw-r--r-- 1 root root 126 May 20 22:00 appendonly.aof

-rw-r--r-- 1 root root 18 May 20 21:58 dump.rdb

Summary: During data synchronization, master creates RDB files only on the first synchronization,

All subsequent synchronizations are synchronized by incremental transmission commands.

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