Redis的主从配置相对于MySQL来说确实是非常简单，不过我们这里还是简单总结一下，仅供参考和学习，如有不足之处，敬请指正。
Redis的编译安装
# wget http://download.redis.io/releases/redis-6.0.8.tar.gz # tar -xzvf redis-6.0.8.tar.gz # cd redis-6.0.8 # make -j 4 # make PREFIX=/usr/local/redis install 如下所示，编译安装后，你可以看到下面目录和文件
创建下面目录，用来存放日志文件、配置文件(redis.conf)、pidfile文件，数据库dump.rdb文件
# mkdir -p /usr/local/redis/data # mkdir -p /usr/local/redis/log # mkdir -p /usr/local/redis/run # mkdir -p /usr/local/redis/conf # cp /tmp/redis-6.0.8/redis.conf /usr/local/redis/conf 修改部分参数，根据实际情况修改。大部分参数选择默认参数即可。
bind 127.0.0.1 192.168.27.115 daemonize yes port 6666 logfile "/usr/local/redis/log/redis.log" dir /usr/local/redis/data pidfile /usr/local/redis/redis_6666.pid 这里指定pidfile跟监听端口一致，例如，监听端口为6666，那么pidfile设置为redis_6666.pid protected-mode no requirepass 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28 查看redis.conf的配置参数
# grep '^[a-Z]' /usr/local/redis/conf/redis.conf bind 127.0.0.1 192.168.27.115 protected-mode no port 6666 tcp-backlog 511 timeout 0 tcp-keepalive 300 daemonize yes supervised no pidfile /usr/local/redis/redis_6666.pid loglevel notice logfile "/usr/local/redis/log/redis.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 rdb-del-sync-files no dir /usr/local/redis/data replica-serve-stale-data yes replica-read-only yes repl-diskless-sync no repl-diskless-sync-delay 5 repl-diskless-load disabled repl-disable-tcp-nodelay no replica-priority 100 acllog-max-len 128 requirepass 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28 lazyfree-lazy-eviction no lazyfree-lazy-expire no lazyfree-lazy-server-del no replica-lazy-flush no lazyfree-lazy-user-del no oom-score-adj no oom-score-adj-values 0 200 800 appendonly no 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 jemalloc-bg-thread yes 创建普通用户
# groupadd redis # useradd redis -g redis -s /sbin/nologin 修改目录的Owner
# chown -R redis:redis /usr/local/redis/ # ls -lrt /usr/local/redis/ 限制redis文件目录访问权限
设置redis的主目录权限为700；
# chmod -R 700 /usr/local/redis/ Redis主从的配置
关于Redis的主服务器的配置如上所示，而Redis的从服务器配置也差不多，可以将/usr/local/redis/目录拷贝到从服务器去，也可以直接在从服务器按照上面步骤安装即可，当然也要创建redis用户、修改目录的owner、限制redis文件夹权限等等。
Redis从服务器的redis.conf还需要额外增加两个参数，如下所示，如果Redis主服务器没有配置requirepass，那么从服务器无需配置masterauth参数
slaveof 192.168.27.115 6666 masterauth 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28 Redis的主从同步很简单，只需要启动Slave实例，会自动将主节点已有的数据同步到从节点。另外，在主节点写入数据也会自动同步到从节点，因此从节点不需要做数据还原的步骤。另外，slave是不允许写入的，在加入了slaveof 之后，实例就成为了只读的。
防火墙配置
# firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="10.20.57.24" port protocol="tcp" port="6666" accept" # systemctl restart firewalld.service 启动Redis的主节点
sudo -u redis /usr/local/redis/bin/redis-server /usr/local/redis/conf/redis.conf
启动Redis的从节点
Redis主从测试同步
[root@localhost ~]# /usr/local/redis/bin/redis-cli -h 192.168.27.115 -p 6666 192.168.27.115:6666> auth 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28 OK 192.168.27.115:6666> set test1 "it's ok" OK 192.168.27.115:6666> get test1 "it's ok [root@KerryDB ~]# /usr/local/redis/bin/redis-cli -h 10.20.57.24 -p 6666 10.20.57.24:6666> get test1 "it's ok" 192.168.27.115:6666> info replication # Replication role:master connected_slaves:1 slave0:ip=10.20.57.24,port=6666,state=online,offset=2526,lag=1 master_replid:b30f19ff9f5e9c852636b07248f1e3b3fb8ea71b master_replid2:0000000000000000000000000000000000000000 master_repl_offset:2526 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:2526 
127.0.0.1:6666> info replication # Replication role:slave master_host:192.168.27.115 master_port:6666 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:557 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:b30f19ff9f5e9c852636b07248f1e3b3fb8ea71b master_replid2:0000000000000000000000000000000000000000 master_repl_offset:557 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:557 正常情况下，主从同步正常，但是也会由于配置原因，导致主从同步异常的情况，需要详细分析日志找出主从同步的原因，当然也有主从不一致等问题，后续篇幅再做介绍。
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