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這篇文章主要講解了“搭建Redis集群的方法”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“搭建Redis集群的方法”吧！
Redis集群是一個由多個主從節點群組成的分布式服務集群，它具有復制、高可用和分片特性。Redis集群不需要sentinel哨兵也能完成節點移除和故障轉移的功能。需要將每個節點設置成集群模式，這種集群模式沒有中心節點，可水平擴展，據官方文檔稱可以線性擴展到上萬個節點(官方推薦不超過1000個節點)。redis集群的性能和高可用性均優于之前版本的哨兵模式，且集群配置非常簡單。
系統：centos7.4
服務器金山云
[root@jsy-bj-test00 ~]# yum install -y ruby rubygems
[work@jsy-bj-test00 ~]$ cp -rp redis redis1 [work@jsy-bj-test00 ~]$ cp -rp redis redis2 [work@jsy-bj-test00 ~]$ cp -rp redis redis3
#六個節點需做如下更改[work@jsy-bj-test00 ~]$ vim redis1/etc/redis.conf [work@jsy-bj-test00 ~]$ sed -i 's/port 6379/port 6380/g' redis5/etc/redis.conf #修改端口 port 6380#打開注釋，開啟集群模式cluster-enabled yes#集群的配置文件cluster-config-file nodes-6380.conf [work@jsy-bj-test00 ~]$ sed -i 's/cluster-config-file nodes-6379.conf/cluster-config-file nodes-6380.conf/g' redis5/etc/redis.conf#pidfile文件pidfile /var/run/redis_6380.pid [work@jsy-bj-test00 ~]$ sed -i 's/pidfile \/var\/run\/redis_6380.pid/pidfile \/var\/run\/redis_6380.pid/g' redis5/etc/redis.conf#日志文件 logfile "/home/work/logs/redis/6380.log"[work@jsy-bj-test00 ~]$ sed -i 's/logfile "\/home\/work\/logs\/redis\/6379.log"/logfile "\/home\/work\/logs\/redis\/6380.log"/g' redis5/etc/redis.conf#rdb持久化文件 dbfilename dump6380.rdb [work@jsy-bj-test00 ~]$ sed -i 's/dbfilename dump6379.rdb/dbfilename dump6380.rdb/g' redis5/etc/redis.conf#請求超時，單位毫秒cluster-node-timeout 5000#開啟aof持久化方式appendonly yes#配置持久化文件appendfilename "appendonly6379.aof"[work@jsy-bj-test00 ~]$ sed -i 's/appendfilename "appendonly6379.aof"/appendfilename "appendonly6383.aof"/g' redis5/etc/redis.conf
啟動腳本start_all.sh
/home/work/redis/bin/redis-server /home/work/redis/etc/redis.conf & /home/work/redis/bin/redis-server /home/work/redis/etc/redis6380.conf & /home/work/redis/bin/redis-server /home/work/redis/etc/redis6381.conf & /home/work/redis/bin/redis-server /home/work/redis/etc/redis6382.conf & /home/work/redis/bin/redis-server /home/work/redis/etc/redis6383.conf & /home/work/redis/bin/redis-server /home/work/redis/etc/redis6384.conf &
關閉腳本stop_all.sh
/home/work/redis/bin/redis-cli -p 6379 -a test shutdown /home/work/redis/bin/redis-cli -p 6380 -a test shutdown /home/work/redis/bin/redis-cli -p 6381 -a test shutdown /home/work/redis/bin/redis-cli -p 6382 -a test shutdown /home/work/redis/bin/redis-cli -p 6383 -a test shutdown /home/work/redis/bin/redis-cli -p 6384 -a test shutdown
有如下報錯
[work@jsy-bj-test00 src]$ ./redis-trib.rb create --replicas 1 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384 /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- redis (LoadError) from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require'from ./redis-trib.rb:25:in `
‘
原因：安裝redis接口報錯ruby版本過低
[root@jsy-bj-test00 ~]# gem install redisFetching: redis-4.1.3.gem (100%) ERROR: Error installing redis: redis requires Ruby version >= 2.3.0.
解決辦法到官網下載最新穩定版源代碼 http://www.ruby-lang.org/en/downloads/ 進行編譯安裝
[work@jsy-bj-test00 soft]$ tar zxvf ruby-2.7.0.tar.gz [work@jsy-bj-test00 soft]$ cd ruby-2.7.0 [work@jsy-bj-test00 ruby-2.7.0]$ ./configure --prefix=/home/work/ruby && make && make install
安裝redis接口
[work@jsy-bj-test00 bin]$ gem install redis
再次執行創建集群命令
[work@jsy-bj-test00 src]$ ./redis-trib.rb create --replicas 1 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384 >>> Creating cluster >>> Performing hash slots allocation on 6 nodes... ...... >>> 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 127.0.0.1:6379) ...... [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
創建成功,查看集群狀態
[work@jsy-bj-test00 ~]$ ./redis/bin/redis-cli -h 127.0.0.1 -p 6379 -c 127.0.0.1:6379> 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_sent:627 cluster_stats_messages_received:627
查看集群節點信息
127.0.0.1:6379> cluster nodes 565246bf31d8e05e464db7455521b1a9f165a9cd 127.0.0.1:6380 master - 0 1578447776230 2 connected 5461-10922 1b99b2a1e4b530501476ab48422c75f30423fd19 127.0.0.1:6383 slave 565246bf31d8e05e464db7455521b1a9f165a9cd 0 1578447778233 5 connected 735ad5778458059316794b9378d4b81aaff20322 127.0.0.1:6379 myself,master - 0 0 1 connected 0-5460 757c2c11ecebfc607aa10a6877e348d0e2da484f 127.0.0.1:6381 master - 0 1578447777732 3 connected 10923-16383 f22efc2bcfcd11cee6487ebc9c75de3b59f5e1d0 127.0.0.1:6382 slave 735ad5778458059316794b9378d4b81aaff20322 0 1578447776230 4 connected b8bba94b9647caa8600363144fd7108082e45f56 127.0.0.1:6384 slave 757c2c11ecebfc607aa10a6877e348d0e2da484f 0 1578447777232 6 connected#這是很重要的命令，我們需要關心的信息有：#第一個參數：節點ID#第二個參數：IP:PORT@TCP 這里一個坑，jedis-2.9.0之前的版本解析@出錯#第三個參數：標志（Master，Slave，Myself，Fail...）#第四個參數：如果是從機則是主機的節點ID#最后兩個參數：連接的狀態和槽的位置。
#集群增加節點，先復制兩個配置文件，并修改配置文件內容[work@jsy-bj-test00 etc]$ cp -p redis.conf redis6385.conf [work@jsy-bj-test00 etc]$ cp -p redis.conf redis6386.conf [work@jsy-bj-test00 etc]$ sed -i 's/6379/6385/g' redis6385.conf [work@jsy-bj-test00 etc]$ sed -i 's/6379/6386/g' redis6386.conf
啟動6385節點
[work@jsy-bj-test00 bin]$ ./redis-server /home/work/redis/etc/redis6385.conf &
將集群管理工具軟連到redis的bin下
[work@jsy-bj-test00 bin]$ ln -s /home/work/soft/redis-3.2.11/src/redis-trib.rb /home/work/redis/bin/redis-trib.rb
將新節點加入集群master
[work@jsy-bj-test00 bin]$ ./redis-trib.rb add-node 127.0.0.1:6385 127.0.0.1:6379 >>> Adding node 127.0.0.1:6385 to cluster 127.0.0.1:6379 >>> Performing Cluster Check (using node 127.0.0.1:6379) ...... [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 127.0.0.1:6385 to make it join the cluster. [OK] New node added correctly.
查看集群狀態，未分配槽位
[work@jsy-bj-test00 bin]$ ./redis-cli -h 127.0.0.1 -p 6379 -c cluster nodes d00d05f601df0b69df0c2cc532b636d2c83347be 127.0.0.1:6385 master - 0 1578450280191 0 connected
給6385節點分配槽位
[work@jsy-bj-test00 bin]$ ./redis-trib.rb reshard 127.0.0.1:6379 >>> Performing Cluster Check (using node 127.0.0.1:6379) ...... [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. How many slots do you want to move (from 1 to 16384)? 500 What is the receiving node ID? d00d05f601df0b69df0c2cc532b636d2c83347be Please enter all the source node IDs. Type 'all' to use all the nodes as source nodes for the hash slots. Type 'done' once you entered all the source nodes IDs. Source node #1:allDo you want to proceed with the proposed reshard plan (yes/no)? yes#第一個參數：需要移動槽的個數，#第二個參數：接受槽的節點ID，#第三個參數：輸入"all"表示從所有原節點中獲取槽，#第四個參數：輸入"yes"開始移動槽到目標結點id#查看6385節點信息，已經分配槽位[work@jsy-bj-test00 bin]$ ./redis-cli -h 127.0.0.1 -p 6379 -c cluster nodes d00d05f601df0b69df0c2cc532b636d2c83347be 127.0.0.1:6385 master - 0 1578452422167 7 connected 0-165 5461-5627 10923-11088
添加從節點，啟動6386節點并加入集群
[work@jsy-bj-test00 bin]$ ./redis-server /home/work/redis/etc/redis6386.conf & [work@jsy-bj-test00 bin]$ ./redis-trib.rb add-node --slave --master-id d00d05f601df0b69df0c2cc532b636d2c83347be 127.0.0.1:6386 127.0.0.1:6385 >>> Adding node 127.0.0.1:6386 to cluster 127.0.0.1:6385 >>> Performing Cluster Check (using node 127.0.0.1:6385) ...... [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 127.0.0.1:6386 to make it join the cluster. Waiting for the cluster to join. >>> Configure node as replica of 127.0.0.1:6385. [OK] New node added correctly.
查看6386節點狀態
[work@jsy-bj-test00 bin]$ ./redis-cli -h 127.0.0.1 -p 6379 -c cluster nodes 6845878cbef3fe25f19a70a8db3eb29abb1b9ea6 127.0.0.1:6386 slave d00d05f601df0b69df0c2cc532b636d2c83347be 0 1578452805439 7 connected
刪除節點
[work@jsy-bj-test00 bin]$ ./redis-trib.rb del-node 127.0.0.1:6383 1b99b2a1e4b530501476ab48422c75f30423fd19 >>> Removing node 1b99b2a1e4b530501476ab48422c75f30423fd19 from cluster 127.0.0.1:6383 >>> Sending CLUSTER FORGET messages to the cluster... >>> SHUTDOWN the node.
感謝各位的閱讀，以上就是“搭建Redis集群的方法”的內容了，經過本文的學習后，相信大家對搭建Redis集群的方法這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是億速云，小編將為大家推送更多相關知識點的文章，歡迎關注！
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