Redis的主從配置相對于MySQL來說确實是非常簡單，不過我們這裡還是簡單總結一下，僅供參考和學習，如有不足之處，敬請指正。
Redis的編譯安裝
# 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，編譯安裝後，你可以看到下面目錄和檔案
建立下面目錄，用來存放日志檔案、配置檔案(redis.conf)、pidfile檔案，資料庫dump.rdb檔案
# 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 修改部分參數，根據實際情況修改。大部分參數選擇預設參數即可。
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 這裡指定pidfile跟監聽端口一緻，例如，監聽端口為6666，那麼pidfile設定為redis_6666.pid protected-mode no requirepass 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28 檢視redis.conf的配置參數
# 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 建立普通使用者
# groupadd redis # useradd redis -g redis -s /sbin/nologin 修改目錄的Owner
# chown -R redis:redis /usr/local/redis/ # ls -lrt /usr/local/redis/ 限制redis檔案目錄通路權限
設定redis的主目錄權限為700；
# chmod -R 700 /usr/local/redis/ Redis主從的配置
關于Redis的主伺服器的配置如上所示，而Redis的從伺服器配置也差不多，可以将/usr/local/redis/目錄拷貝到從伺服器去，也可以直接在從伺服器按照上面步驟安裝即可，當然也要建立redis使用者、修改目錄的owner、限制redis檔案夾權限等等。
Redis從伺服器的redis.conf還需要額外增加兩個參數，如下所示，如果Redis主伺服器沒有配置requirepass，那麼從伺服器無需配置masterauth參數
slaveof 192.168.27.115 6666 masterauth 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28 Redis的主從同步很簡單，隻需要啟動Slave執行個體，會自動将主節點已有的資料同步到從節點。另外，在主節點寫入資料也會自動同步到從節點，是以從節點不需要做資料還原的步驟。另外，slave是不允許寫入的，在加入了slaveof 之後，執行個體就成為了隻讀的。
防火牆配置
# 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 啟動Redis的主節點
sudo -u redis /usr/local/redis/bin/redis-server /usr/local/redis/conf/redis.conf
啟動Redis的從節點
Redis主從測試同步
[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 正常情況下，主從同步正常，但是也會由于配置原因，導緻主從同步異常的情況，需要詳細分析日志找出主從同步的原因，當然也有主從不一緻等問題，後續篇幅再做介紹。
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