The basic configuration of Redis

Redis's MS Master-slave cluster role: 1, master-slave backup to prevent downtime 2, read and write separation, share the Master Task 3, task separation

The MS Synchronization principle of Redis: Ms Automatic connection, s initiates synchronization, m start dump out Rdb,s received M's RDB storage to their own memory, in M dump process, and new data generated, m will buffer the new data into the AOF, when m do dump end, Also send aof to slave, complete a synchronization end.

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There are 2 ways to persist Redis : RDB, AOF

configuration options for Rdb snapshots

Save 1//within the range of 1 writes , a snapshot is generated

Save +// if there are more than five writes in a second, a snapshot is generated

Save 10000// if There are 10000 writes in a second , a snapshot is generated

( these 3 options are masked , the rdb is disabled )

Stop-writes-on-bgsave-error Yes// background backup process error , does the main process stop writing ?

Rdbcompression Yes// the exported rdb file is compressed

Rdbchecksum Yes// import RBD when restoring data , do not verify the integrity of the RDB

Dbfilename Dump.rdb//The RDB filename of the guide

Dir.///rdb Placement Path

configuration of the Aof

AppendOnly No # whether to turn on the aof log feature

Appendfsync always # every 1 commands , sync to aof immediately . safe , slow speed

Appendfsync everysec # Compromise, write 1 times per second

Appendfsync No # writes to the operating system , determines the buffer size by the operating system , and writes uniformly to the aof. low synchronization frequency , fast speed ,

No-appendfsync-on-rewrite Yes: # in the process of exporting an Rdb snapshot, either stop synchronizing aof

Auto-aof-rewrite-percentage #aof File size compared to the size of the last rewrite , the growth rate 100% when overridden

Auto-aof-rewrite-min-size 64mb #aof file , at least 64M , override

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The basic configuration of Redis