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

one。 What is master-slave replication?

There is a problem with the redis stand-alone:

1. Stand-alone machine failure, can not recover quickly

two。 Memory limit of single machine capacity

3. Stand-alone QPS problem

Simply put, slave replicates master data.

The role of master-slave replication:

1. Provide copy of data (backup)

two。 Extended read performance (read-write separation)

A slave has only one master, and a master has multiple slave

One-way data flow: master- > slave

Second, how to configure replication

1. Specify who the slave service is through the slaveof command configuration

Redis-server / Users/zhangrenjie/redis-master-slave/redis_6381.conf

127.0.0.1 slaveof 6382 > 127.0.0.1 6379

OK

View master and slave information

127.0.0.1purl 6381 > info replication

# Replicationrole:slavemaster_host:127.0.0.1master_port:6379master_link_status:upmaster_last_io_seconds_ago:2master_sync_in_progress:0slave_repl_offset:1418slave_priority:100slave_read_only:1connected_slaves:0master_replid:8ad20b647446628d7f21585a73838af209d9e147master_replid2:0000000000000000000000000000000000000000master_repl_offset:1418second_repl_offset:-1repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:705repl_backlog_histlen:714

Enter the main service

127.0.0.1 purl 6379 > info replication

# Replicationrole:masterconnected_slaves:3slave0:ip=127.0.0.1,port=6380,state=online,offset=914,lag=1slave1:ip=127.0.0.1,port=6381,state=online,offset=914,lag=0slave2:ip=127.0.0.1,port=6382,state=online,offset=914,lag=0master_replid:8ad20b647446628d7f21585a73838af209d9e147master_replid2:0000000000000000000000000000000000000000master_repl_offset:914second_repl_offset:-1repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:1repl_backlog_histlen:914

Cancel the slave slave node, and the data passed through the original database will not disappear.

127.0.0.1 purl 6382 > slaveof no one

OK

Note: when slave synchronizes master data, the own data on slave will be erased

two。 Configure through a profile

Slaveof ip portslave-read-only yes slave node read-only

Areas that need to be modified and improved:

1.daemon yes # running in the background

2.pidfile # pid process ID stores files

3.logfile # log storage path

# save 100 1

# save 1000 10

4.dbfilename dump-6379.rdb # data file

5.dir # working directory

6.masterauth # Primary Node password

7.slave-read-only yes # set read-only from slave node

8.slaveof ip port # specifies whose slave node it belongs to

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