Redis主從配置總結

Redis的主從配置相對于MySQL來說確實是非常簡單，不過我們這里還是簡單總結一下，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，編譯安裝后，你可以看到下面目錄和檔案

創建下面目錄，用來存放日志檔案、組態檔(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

修改部分引數，根據實際情況修改，大部分引數選擇默認引數即可，

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  這里指定pidfile跟監聽埠一致，例如，監聽埠為6666，那么pidfile設定為redis_6666.pid

protected-mode no

requirepass 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28

查看redis.conf的配置引數

# 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

創建普通用戶

# 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檔案目錄訪問權限

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的主服務器的配置如上所示，而Redis的從服務器配置也差不多，可以將/usr/local/redis/目錄拷貝到從服務器去，也可以直接在從服務器按照上面步驟安裝即可，當然也要創建redis用戶、修改目錄的owner、限制redis檔案夾權限等等，

Redis從服務器的redis.conf還需要額外增加兩個引數，如下所示，如果Redis主服務器沒有配置requirepass，那么從服務器無需配置masterauth引數

slaveof 192.168.27.115 6666

masterauth 75612a867ceeb452924c98778caa959c37120bfff6582aaad48298acbf320b28

Redis的主從同步很簡單，只需要啟動Slave實體，會自動將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，因此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  之后，實體就成為了只讀的，

防火墻配置

# 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

sudo -u redis /usr/local/redis/bin/redis-server /usr/local/redis/conf/redis.conf

Redis主從測驗同步

[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，導致主從同步例外的情況，需要詳細分析日志找出主從同步的原因，當然也有主從不一致等問題，后續篇幅再做介紹，

參考資料：

http://mdba.cn/2013/10/22/redis%e5%ae%89%e8%a3%85%e4%b8%8e%e4%b8%bb%e4%bb%8e%e9%85%8d%e7%bd%ae/

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