如何配置redis原生集群

以单机配置redis集群为例。准备3主3备共计6个节点。

安装系统依赖

yum install ruby rubygems

更新ruby

wget https://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.0.tar.gz

节点清单

redis16379  主1      redis16479备1

redis16380  主2      redis16480备2

redis16381  主3      redis16481备3

分别修改对应目录下的配置文件，主要调整参数

bind 127.0.0.1

port 16379  #对应节点对应设置

pidfile "/var/run/redis_16380.pid" #对应节点对应设置

logfile "/home/redisCluster/redis16379/16379.log" #对应节点对应设置

dir "/home/redisCluster/redis16379/" #对应节点对应设置

cluster-enabled yes  

cluster-config-file nodes.conf

cluster-node-timeout 15000

appendonly yes

安装openssl

http://nccloud.yytimes.com/q_63.html

升级 ruby

http://nccloud.yytimes.com/q_64.html

安装redis-trib.rb运行依赖的ruby的包redis-XXX.gem

cd /home/redisCluster 

wget https://rubygems.org/downloads/redis-4.1.3.gem

gem install redis-4.1.3.gem

启动6个节点

/home/redisCluster/src/redis-server /home/redisCluster/redis16379/redis.conf

/home/redisCluster/src/redis-server /home/redisCluster/redis16380/redis.conf

/home/redisCluster/src/redis-server /home/redisCluster/redis16381/redis.conf

/home/redisCluster/src/redis-server /home/redisCluster/redis16479/redis.conf

/home/redisCluster/src/redis-server /home/redisCluster/redis16480/redis.conf

/home/redisCluster/src/redis-server /home/redisCluster/redis16481/redis.conf

创建集群

/home/redisCluster/src/redis-cli --cluster create 127.0.0.1:16379 127.0.0.1:16380 127.0.0.1:16381 127.0.0.1:16479 127.0.0.1:16480 127.0.0.1:16481 --cluster-replicas 1

等待集群配置完成

>>> Performing hash slots allocation on 6 nodes...

Master[0] -> Slots 0 - 5460

Master[1] -> Slots 5461 - 10922

Master[2] -> Slots 10923 - 16383

Adding replica 127.0.0.1:16480 to 127.0.0.1:16379

Adding replica 127.0.0.1:16481 to 127.0.0.1:16380

Adding replica 127.0.0.1:16479 to 127.0.0.1:16381

>>> Trying to optimize slaves allocation for anti-affinity

[WARNING] Some slaves are in the same host as their master

M: 90141301b92594f876598d6ac99ee32360930c93 127.0.0.1:16379

   slots:[0-5460] (5461 slots) master

M: 6249fa8bee783808b2a890f0fa9304b76d0292d0 127.0.0.1:16380

   slots:[5461-10922] (5462 slots) master

M: bc77c4fc6f836b47e83d241d01aad2297177bb46 127.0.0.1:16381

   slots:[10923-16383] (5461 slots) master

S: e4ccfa14595d949e6b52b1925822fa1c34c4fed8 127.0.0.1:16479

   replicates bc77c4fc6f836b47e83d241d01aad2297177bb46

S: abc9089dc7602f0437f3e80c4b068d9942a18997 127.0.0.1:16480

   replicates 90141301b92594f876598d6ac99ee32360930c93

S: 5b07bd288945ebb3b92f8c056787fad03bd9a597 127.0.0.1:16481

   replicates 6249fa8bee783808b2a890f0fa9304b76d0292d0

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 127.0.0.1:16379)

M: 90141301b92594f876598d6ac99ee32360930c93 127.0.0.1:16379

   slots:[0-5460] (5461 slots) master

   1 additional replica(s)

M: 6249fa8bee783808b2a890f0fa9304b76d0292d0 127.0.0.1:16380

   slots:[5461-10922] (5462 slots) master

   1 additional replica(s)

M: bc77c4fc6f836b47e83d241d01aad2297177bb46 127.0.0.1:16381

   slots:[10923-16383] (5461 slots) master

   1 additional replica(s)

S: 5b07bd288945ebb3b92f8c056787fad03bd9a597 127.0.0.1:16481

   slots: (0 slots) slave

   replicates 6249fa8bee783808b2a890f0fa9304b76d0292d0

S: e4ccfa14595d949e6b52b1925822fa1c34c4fed8 127.0.0.1:16479

   slots: (0 slots) slave

   replicates bc77c4fc6f836b47e83d241d01aad2297177bb46

S: abc9089dc7602f0437f3e80c4b068d9942a18997 127.0.0.1:16480

   slots: (0 slots) slave

   replicates 90141301b92594f876598d6ac99ee32360930c93

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

验证集群功能，连接集群需增加-c 和-p 端口参数

/home/redisCluster/src/redis-cli -c -p 16379

127.0.0.1:16379> set nccloud 1

-> Redirected to slot [7504] located at 127.0.0.1:16380

OK

127.0.0.1:16380> get nccloud

"1"

127.0.0.1:16380> exit

[root@rac157 redisCluster]# /home/redisCluster/src/redis-cli -c -p 16481

127.0.0.1:16481> get nccloud

-> Redirected to slot [7504] located at 127.0.0.1:16380

"1"

附：redis集群常用命令

连接

/home/redisCluster/src/redis-cli -c -p 16379

集群

cluster info ：打印集群的信息

cluster nodes ：列出集群当前已知的所有节点（ node），以及这些节点的相关信息。

节点

cluster meet   ：将 ip 和 port 所指定的节点添加到集群当中，让它成为集群的一份子。

cluster forget  ：从集群中移除 node_id 指定的节点。

cluster replicate  ：将当前节点设置为 node_id 指定的节点的从节点。

cluster saveconfig ：将节点的配置文件保存到硬盘里面。

槽(slot)

cluster addslots  [slot ...] ：将一个或多个槽（ slot）指派（ assign）给当前节点。

cluster delslots  [slot ...] ：移除一个或多个槽对当前节点的指派。

cluster flushslots ：移除指派给当前节点的所有槽，让当前节点变成一个没有指派任何槽的节点。

cluster setslot  node  ：将槽 slot 指派给 node_id 指定的节点，如果槽已经指派给

另一个节点，那么先让另一个节点删除该槽>，然后再进行指派。

cluster setslot  migrating  ：将本节点的槽 slot 迁移到 node_id 指定的节点中。

cluster setslot  importing  ：从 node_id 指定的节点中导入槽 slot 到本节点。

cluster setslot  stable ：取消对槽 slot 的导入（ import）或者迁移（ migrate）。

键

cluster keyslot  ：计算键 key 应该被放置在哪个槽上。

cluster countkeysinslot  ：返回槽 slot 目前包含的键值对数量。

cluster getkeysinslot   ：返回 count 个 slot 槽中的键