Redis Cluster集群管理手册

Redis Cluster集群管理

1. redis-trib.rb集群管理工具

在Redis4.x及之前版本，需要安装redis-trib模块管理集群，因为绝大部分集群功能需要依赖redis-trib模块实现。

1. 创建集群

若是Redis 5.x及以上版本，可采用redis-cli工具部署，因为Redis 5.x及以上版本彻底抛弃了ruby，将集群管理功能集成到了redis-cli工具中，

语法：redis-trib.rb create --replicas 1 redis_host1:redis_port1 redis_host2:redis_port2 redis_host3:redis_port3 ... redis_hostn:redis_portn
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特别注意，–replicas选项值代表指定几个从库。

2. 查看集群信息

1. 通过redis-trib.rb检查集群配置

可以检查集群的配置是否正确，以及全部16384个槽是否已经全部指派给了主节点：

语法：redis-trib.rb check existing_host:existing_port
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existing_host:existing_port可以为Redis Cluster集群中任意一个节点的地址，作为访问集群的入口。

# 示例1：检查Redis节点192.168.111.111:2011所在集群的配置
# redis-trib.rb check 192.168.111.111:2011

Performing Cluster Check (using node 192.168.111.111:2011)
M: 7b5f21f124373b7d99edafaab01b90afdcfe8592 192.168.111.111:2011
slots:0-2730 (2731 slots) master
1 additional replica(s)
M: 81757eeb491059021c8e2468f361245764800c05 192.168.111.112:2011
slots:2731-5460 (2730 slots) master
1 additional replica(s)
M: 1e94fb4e201b9e7c4eccc207a6f8bae883d1dff1 192.168.111.111:2012
slots:8192-10922 (2731 slots) master
1 additional replica(s)
M: cf118efd950061ae013c52539f66f7ff1779100f 192.168.111.112:2012
slots:10923-13652 (2730 slots) master
1 additional replica(s)
S: b9de42bb24a48cc6a8b6fc72f2c38f43057bf459 192.168.111.113:2014
slots: (0 slots) slave
replicates cf118efd950061ae013c52539f66f7ff1779100f
S: 79187b202bdb436e26d5a7b16e1e91bff0584dc1 192.168.111.111:2014
slots: (0 slots) slave
replicates 8bcaa25b6d0c61fedf1b181971f5eb7f4da7380d
S: 12874ba078047ad747e6123f68c32ddd94c752bc 192.168.111.112:2013
slots: (0 slots) slave
replicates 7b5f21f124373b7d99edafaab01b90afdcfe8592
S: 722ee8a5d3508df3eb6afeff60550de9b5b524be 192.168.111.113:2013
slots: (0 slots) slave
replicates 81757eeb491059021c8e2468f361245764800c05
M: 8bcaa25b6d0c61fedf1b181971f5eb7f4da7380d 192.168.111.113:2011
slots:5461-8191 (2731 slots) master
1 additional replica(s)
S: 7a5c454dfecc3ed53c6bd8cc29a01c3114ee0067 192.168.111.111:2013
slots: (0 slots) slave
replicates 15595bdf3cccc20eb25faf7993608b20967a8673
S: 2c24ba35f85e185b98c66ead9f3ce1a444839fb8 192.168.111.112:2014
slots: (0 slots) slave
replicates 1e94fb4e201b9e7c4eccc207a6f8bae883d1dff1
M: 15595bdf3cccc20eb25faf7993608b20967a8673 192.168.111.113:2012
slots:13653-16383 (2731 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
Check for open slots...
Check slots coverage...
[OK] All 16384 slots covered.

注：如上提示均OK，则表示检查集群的配置正确，以及全部16384个槽已经全部指派给了主节点。
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2. 通过redis-cli查看集群信息

# 示例1：查看Redis实例192.168.111.111:2011所在集群信息
# redis-cli -h 192.168.111.111 -p 2011 cluster info 
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:12
cluster_size:6
cluster_current_epoch:12
cluster_my_epoch:1
cluster_stats_messages_ping_sent:57
cluster_stats_messages_pong_sent:77
cluster_stats_messages_sent:134
cluster_stats_messages_ping_received:66
cluster_stats_messages_pong_received:57
cluster_stats_messages_meet_received:11
cluster_stats_messages_received:134

注：上面cluster_state指标为OK代表集群处于在线状态ÿ
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