redis配置和主从复制

Posted 2020-10-12 Copernicus

Redis主从复制过程原理

1.当从库和主库建立MS关系后,会向主数据库发送SYNC命令
2.主库接收到SYNC命令后会开始在后台保存快照(RDB持久化过程),并将期间接收到的写命令缓存起来
3.当快照完成后,主Redis会将快照文件和所有缓存的写命令发送给从Redis
4.从Redis接收到后,会载入快照文件并且执行收到的缓存的命令
5.之后,主Redis每当接收到写命令时就会将命令发送从Redis，从而保证数据的一致

基本配置

daemonize yes
pidfile /usr/local/redis/var/redis.pid
port 6379
bind 0.0.0.0
unixsocket /usr/local/redis/var/redis.sock
unixsocketperm 755
timeout 300
loglevel verbose
logfile /data/redis/redis.log
# syslog-enabled no
# syslog-ident redis
# syslog-facility local0
databases 16
save 900 1
save 300 10
save 60 10000
rdbcompression yes
dbfilename dump.rdb
dir /data/redis/dbcache
# slaveof <masterip> <masterport>
# masterauth <master-password>
# repl-ping-slave-period 10
# repl-timeout 60
requirepass $password
# rename-command CONFIG ""
# maxclients 0
# maxmemory <bytes>
# maxmemory-policy volatile-lru
# maxmemory-samples 3
appendonly no
appendfilename appendonly.aof
appendfsync always
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
slowlog-log-slower-than 10000
slowlog-max-len 128
# vm-enabled no
# vm-swap-file /data/dbcache/redis.swap
# vm-max-memory 0
# vm-page-size 32
# vm-pages 134217728
# vm-max-threads 4
# glueoutputbuf yes
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
activerehashing yes　

 slave配置

#slave添加选项：

slaveof $master $port

#如果master设置密码：

masterauth $password

#slave启动非只读（默认为yes）：

slave-read-only no

#错误日志会显示I/O error trying to sync withMASTER: connection lost

>config set client-output-buffer-limit slave1024mb 256mb 0