这篇文章主要介绍“Redis cluster集群需要至少多少个redis节点”,在日常操作中,相信很多人在Redis cluster集群需要至少多少个redis节点问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”Redis cluster集群需要至少多少个redis节点”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
##配置redis集群需要至少6个redis节点
集群至少3主3从才可以搭建,防止错乱我们在redis 下建立一个文件夹cluster,里面复制6份配置文件,改名为redis1-redis6.conf
把每个配置文件都修改以下共同点:
bind 10.233.19.36 (根据实际情况配置)
port 7001 (7001-7006)
daemonize yes(以守护进程运行)
pidfile /var/run/redis.pid (守护进程生成的文件,以实际情况配置)
appendonly yes (开启AOF日志记录Redis操作的持久化)
appendfilename "appendonly-7001.aof" (AOF文件名,配置端口为文件名便于查看)
cluster-enabled yes (开启集群)
cluster-config-file nodes-7001.conf (节点信息,已节点命名便于查看)
cluster-node-timeout 15000 (节点响应超时时间)
以上为共同点每个节点不论主从都需要配置。
此外还需要注意,不要再为各个节点主动配置主从关系,否则启动时会报错。
因为主从关系要给redis集群自己调节。
##启动redis集群
上面的配置完成之后,分别启动6个redis实例。配置正确的情况下,都可以启动成功。然后运行如下命令创建集群:
注意,这里使用的是ip:port
replicas
1 表示我们希望为集群中的每个主节点创建一个从节点
因为配置文件中设置了密码所以创建集群也需要加密码参数 -a
[ERR] Node 10.233.19.36:6380 NOAUTH Authentication required.
[redis@weblogic-test bin]$ ./redis-cli --cluster create 10.233.19.36:6380 10.233.19.36:6381 10.233.19.36:6382 10.233.19.36:6383 10.233.19.36:6384 10.233.19.36:6385 --cluster-replicas 1 -a beijing
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 10.233.19.36:6383 to 10.233.19.36:6380
Adding replica 10.233.19.36:6384 to 10.233.19.36:6381
Adding replica 10.233.19.36:6385 to 10.233.19.36:6382
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 369151e4f1bed1e3fcaf474025853bc72056542e 10.233.19.36:6380
slots:[0-5460] (5461 slots) master
M: 1f9314f13a22c2c68c609e98247bfe6d0714c75b 10.233.19.36:6381
slots:[5461-10922] (5462 slots) master
M: 41840a493fceef875b1a521d951090f9c99c7040 10.233.19.36:6382
slots:[10923-16383] (5461 slots) master
S: 438c5ecaf7501da25bfc0d2055445c036907ba61 10.233.19.36:6383
replicates 1f9314f13a22c2c68c609e98247bfe6d0714c75b
S: 9598769e90155aeb130a33980ac1a1c27b1609cc 10.233.19.36:6384
replicates 41840a493fceef875b1a521d951090f9c99c7040
S: b0d325e936ee5055648561302560d055d0bdb365 10.233.19.36:6385
replicates 369151e4f1bed1e3fcaf474025853bc72056542e
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
..
>>> Performing Cluster Check (using node 10.233.19.36:6380)
M: 369151e4f1bed1e3fcaf474025853bc72056542e 10.233.19.36:6380
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 1f9314f13a22c2c68c609e98247bfe6d0714c75b 10.233.19.36:6381
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 9598769e90155aeb130a33980ac1a1c27b1609cc 10.233.19.36:6384
slots: (0 slots) slave
replicates 41840a493fceef875b1a521d951090f9c99c7040
M: 41840a493fceef875b1a521d951090f9c99c7040 10.233.19.36:6382
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: b0d325e936ee5055648561302560d055d0bdb365 10.233.19.36:6385
slots: (0 slots) slave
replicates 369151e4f1bed1e3fcaf474025853bc72056542e
S: 438c5ecaf7501da25bfc0d2055445c036907ba61 10.233.19.36:6383
slots: (0 slots) slave
replicates 1f9314f13a22c2c68c609e98247bfe6d0714c75b
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
执行成功之后,连接一台redis,执行 cluster info 会看到类似如下信息:
127.0.0.1:6380> cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:190
cluster_stats_messages_pong_sent:181
cluster_stats_messages_sent:371
cluster_stats_messages_ping_received:176
cluster_stats_messages_pong_received:190
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:371
我们可以看到cluster_state:ok,cluster_slots_ok:16384,cluster_size:3。
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