Redist的主从配置

Redis的主从复制一般用来在线备份和读写分离，提高服务器的负载能力。主数据库主要进行写操作，而从数据库负责读操作。

主从的配置：

主节点：

[root@master ~]# grep -v -E "^#|^$" /etc/redis/6379.conf
bind 0.0.0.0    //绑定的主机地址。说明只能通过这个ip地址连接本机的redis。最好绑定0.0.0.0
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize yes   //这个修改为yes，守护进程
supervised no
pidfile /var/run/redis_6379.pid
loglevel notice
logfile /var/log/redis_6379.log
databases 16
always-show-logo yes
save 900 1         #启用RDB快照功能，默认就是启用的
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /var/lib/redis/6379    ＃redis数据目录
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
replica-priority 100
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush no
appendonly yes   #启用AOF持久化方式
appendfilename "appendonly.aof"    #AOF文件的名称，默认为appendonly.aof
appendfsync everysec    #每秒钟强制写入磁盘一次，在性能和持久化方面做了很好的折中，是受推荐的方式。
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
aof-use-rdb-preamble yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes

　

从节点的配置，只需加一行replicaof 192.168.0.10 6379

[root@node2 redis]# grep -v -E "^#|^$" /etc/redis/6379.conf
bind 0.0.0.0
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile /var/run/redis_6379.pid
loglevel notice
logfile /var/log/redis_6379.log
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /var/lib/redis/6379
replicaof 192.168.0.10 6379     #主节点redis的IP和端口
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
replica-priority 100
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush no
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
aof-use-rdb-preamble yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes

　　启动主，从节点数据就开始同步了

=============================================配置密码======================================

主节点;

requirepass pass1234  # 注意，这个是连接master节点，同步数据用的密码.  slave节点需要设置这两个密码

从节点：

requirepass pass1234     这个是slave节点上登录自己的redis用的密码
masterauth pass1234     # 注意，这个是连接master节点，同步数据用的密码.  slave节点需要设置这两个密码

　　

使用role和info 查看主从信息

127.0.0.1:6379> role
1) "master"      #主节点
2) (integer) 4740  #偏移量
3) 1) 1) "192.168.0.12"   #从节点
      2) "6379"
      3) "4740"

127.0.0.1:6379> INFO replication
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.0.12,port=6379,state=online,offset=5300,lag=1
master_replid:3f8d3c3ab80297ef3916615f8c3b2c22733814cf
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:5300
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:530

　　

参考：

https://redis.io/topics/replication