一:redis-cluster架構圖
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiI0NXYFhGd192UvwVe0lmdhJ3ZvwFM38CXlZHbvN3cpR2Lc1TPB10QGtWUCpEMJ9CXsxWam9CXwADNvwVZ6l2c052bm9CXUJDT1wkNhVzLcRnbvZ2LcdXRq5EMFRUT5FlMkZXUYpVd1kmYr50MZV3YyI2cKJDT29GRjBjUIF2LcRHelR3LcJzLctmch1mclRXY39DOyUTN1EDMyITOyMDM3EDMy8CX0Vmbu4GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)
架構細節:
(1)所有的redis節點彼此互聯(PING-PONG機制),内部使用二進制協定優化傳輸速度和帶寬.
(2)節點的fail是通過叢集中超過半數的節點檢測失效時才生效.
(3)用戶端與redis節點直連,不需要中間proxy層.用戶端不需要連接配接叢集所有節點,連接配接叢集中任何一個可用節點即可
(4)redis-cluster把所有的實體節點映射到[0-16383]slot上,cluster 負責維護node<->slot<->value
Redis 叢集中内置了 16384 個哈希槽,當需要在 Redis 叢集中放置一個 key-value 時,redis 先對 key 使用 crc16 算法算出一個結果,然後把結果對 16384 求餘數,這樣每個 key 都會對應一個編号在 0-16383 之間的哈希槽,redis 會根據節點數量大緻均等的将哈希槽映射到不同的節點
二:Redis叢集的搭建
2.1. 叢集搭建環境
、使用ruby腳本搭建叢集。需要ruby的運作環境。
安裝ruby
yum install ruby
yum install rubygems
、安裝ruby腳本運作使用的包。
[[email protected] ~]# gem install redis-3.0.0.gem
Successfully installed redis-
gem installed
Installing ri documentation for redis-...
Installing RDoc documentation for redis-...
[[email protected] ~]#
[[email protected] ~]# cd redis-3.0.0/src
[[email protected] src]# ll *.rb
-rwxrwxr-x. root root Apr redis-trib.rb
2.2. 搭建步驟
需要6台redis伺服器。搭建僞分布式。
需要6個redis執行個體。
需要運作在不同的端口7001-7006
第一步:建立6個redis執行個體,每個執行個體運作在不同的端口。需要修改redis.conf配置檔案。配置檔案中還需要把cluster-enabled yes前的注釋去掉。
第二步:啟動每個redis執行個體。
第三步:使用ruby腳本搭建叢集。
建立關閉叢集的腳本:
[[email protected] redis-cluster]# vim shutdow-all.sh
redis01/redis-cli -p 7001 shutdown
redis01/redis-cli -p 7002 shutdown
redis01/redis-cli -p 7003 shutdown
redis01/redis-cli -p 7004 shutdown
redis01/redis-cli -p 7005 shutdown
redis01/redis-cli -p 7006 shutdown
[[email protected] redis-cluster]# chmod u+x shutdow-all.sh
[[email protected] redis-cluster]# ./redis-trib.rb create --replicas : : : : : :
>>> Creating cluster
Connecting to node :: OK
Connecting to node :: OK
Connecting to node :: OK
Connecting to node :: OK
Connecting to node :: OK
Connecting to node :: OK
>>> Performing hash slots allocation on nodes...
Using masters:
:
:
:
Adding replica : to :
Adding replica : to :
Adding replica : to :
M: ae301e9c32b04a7d4d92e15e98e78de8c1f3 :
slots:- ( slots) master
M: cd93a9a943b4ef851af6a03edd699a6061ace01 :
slots:- ( slots) master
M: d83f20b1253d7f43dae32aab9744e6 :
slots:- ( slots) master
S: f9d9706f848471583929fc8bbde3c8e99e211b :
replicates ae301e9c32b04a7d4d92e15e98e78de8c1f3
S: cc9e25ebb19dda92591364c1df4b3a518b795b :
replicates cd93a9a943b4ef851af6a03edd699a6061ace01
S: b1b11d509d29659c2831e7a9f6469c060dfcd39 :
replicates d83f20b1253d7f43dae32aab9744e6
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 :)
M: ae301e9c32b04a7d4d92e15e98e78de8c1f3 :
slots:- ( slots) master
M: cd93a9a943b4ef851af6a03edd699a6061ace01 :
slots:- ( slots) master
M: d83f20b1253d7f43dae32aab9744e6 :
slots:- ( slots) master
M: f9d9706f848471583929fc8bbde3c8e99e211b :
slots: ( slots) master
replicates ae301e9c32b04a7d4d92e15e98e78de8c1f3
M: cc9e25ebb19dda92591364c1df4b3a518b795b :
slots: ( slots) master
replicates cd93a9a943b4ef851af6a03edd699a6061ace01
M: b1b11d509d29659c2831e7a9f6469c060dfcd39 :
slots: ( slots) master
replicates d83f20b1253d7f43dae32aab9744e6
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
[[email protected] redis-cluster]#