(1)Slave服务器连接到Master服务器
(2)Slave服务器发送SYCN命令
(3)Master服务器收到SYNC执行BGSAVE,并保存操作执行期间，新执行的写入命令都保存到一个缓存区
(4)Master服务器把BGSAVE执行完,将.rdb文件传输给Slave服务器.
(5)Slave服务器接收到.rdb文件数据导入到内存中
(6)Master服务器以Redis命令协议格式，将写命令缓存中所有内容发给从服务器
(7)接下来就是增量同步
引用
2.8之前不支持部分同步，2.8以后支持了（PSYNC命令)
主服务器配置
daemonize yes pidfile /var/run/redis.pid port 6379 tcp-backlog 511 timeout 0 tcp-keepalive 0 loglevel warning logfile "/usr/local/redis/redis.log" databases 16 save 900 1 save 300 10 save 60 10000 stop-writes-on-bgsave-error yes rdbcompression yes rdbchecksum yes dbfilename dump.rdb dir /usr/local/redis slave-serve-stale-data yes slave-read-only yes repl-disable-tcp-nodelay no slave-priority 100 appendonly no appendfilename "appendonly.aof" appendfsync everysec no-appendfsync-on-rewrite no auto-aof-rewrite-percentage 100 auto-aof-rewrite-min-size 64mb lua-time-limit 5000 slowlog-log-slower-than 10000 slowlog-max-len 128 notify-keyspace-events "" 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 hll-sparse-max-bytes 3000 activerehashing yes client-output-buffer-limit normal 0 0 0 client-output-buffer-limit slave 256mb 64mb 60 client-output-buffer-limit pubsub 32mb 8mb 60 hz 10 aof-rewrite-incremental-fsync yes
从服务器配置
daemonize yes pidfile /var/run/redis.pid port 6379 tcp-backlog 511 timeout 0 tcp-keepalive 0 loglevel warning logfile "/usr/local/redis/redis.log" databases 16 save 900 1 save 300 10 save 60 10000 stop-writes-on-bgsave-error yes rdbcompression yes rdbchecksum yes dbfilename dump.rdb dir /usr/local/redis slave-serve-stale-data yes slave-read-only yes repl-disable-tcp-nodelay no slave-priority 100 appendonly no appendfilename "appendonly.aof" appendfsync everysec no-appendfsync-on-rewrite no auto-aof-rewrite-percentage 100 auto-aof-rewrite-min-size 64mb lua-time-limit 5000 slowlog-log-slower-than 10000 slowlog-max-len 128 notify-keyspace-events "" 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 hll-sparse-max-bytes 3000 activerehashing yes client-output-buffer-limit normal 0 0 0 client-output-buffer-limit slave 256mb 64mb 60 client-output-buffer-limit pubsub 32mb 8mb 60 hz 10 aof-rewrite-incremental-fsync yes slaveof 114.215.142.108 6379 //就需要配置这里就行