Redis3 正式支持了 cluster，是為了解決構建redis集群時的諸多不便

（1）像操作單個redis一樣操作key，不用操心key在哪個節點上
（2）在線動態添加、刪除redis節點，不用停止服務
（3）根據節點性能，動態分配不同數量的key到不同redis節點

（4）每個節點都配有slave，并自動監測和切換

?

Redis3 cluster 中增加了一個重要概念：

hash slot（哈希槽），共有16384個slot
key不是直接放入redis中了，而是放入slot中，再把slot放入redis中

根據key的hash值計算其所在的slot，再根據slot和redis節點的對應關系，找到此slot所在的節點，然后到這個節點對key進行操作

例如現有3個redis節點，每個節點各負責一半數量的slot，16384/3 = 5461個
現在想添加一個redis節點，可以從 節點1、節點2、節點3?中各拿出一部分的slot，移到新節點
每個redis節點中的slot數量可以不一致，根據節點性能適當分配 進入集群需要用redis -c -p 7000 ? ?-c是enable cluster ? p指定進入端口 搭建集群遇到的問題： 由于教程里面給出的集群的地址是127.0.0.1:7000、......，在java程序訪問的時候是無法獲取節點信息的，所以我需要重新搭建集群，然后停掉所有節點，重新搭建的時候，報出了如下錯誤，可知是因為有些配置文件以及數據沒有刪除。將其全部刪除干凈即可。 [ERR] Node 172.168.63.202:7001 is not empty. Either the nodealready knows other nodes (check with CLUSTER NODES) or contains some key in database 0. find / -name dump.rdb?
rm -f /usr/redis/cluster/7002/redis7002/src/dump.rdb? rm -f /usr/redis/cluster/7004/redis7004/src/dump.rdb rm -f /usr/redis/cluster/7005/redis7005/src/dump.rdb rm -f /usr/redis/cluster/7001/redis7001/src/dump.rdb rm -f /usr/redis/cluster/7000/redis7000/src/dump.rdb rm -f /usr/redis/cluster/7003/redis7003/src/dump.rdb rm -f /usr/redis/master/redis-3.0.7/src/dump.rdb find / -name dump.rdb find / -name appendonly.aof rm -f /usr/redis/cluster/7002/redis7002/src/appendonly.aof rm -f /usr/redis/cluster/7004/redis7004/src/appendonly.aof rm -f /usr/redis/cluster/7005/redis7005/src/appendonly.aof rm -f /usr/redis/cluster/7001/redis7001/src/appendonly.aof rm -f /usr/redis/cluster/7000/redis7000/src/appendonly.aof rm -f /usr/redis/cluster/7003/redis7003/src/appendonly.aof find / -name appendonly.aof find / -name nodes.conf rm -f /usr/redis/cluster/7002/redis7002/src/nodes.conf rm -f /usr/redis/cluster/7004/redis7004/src/nodes.conf rm -f /usr/redis/cluster/7005/redis7005/src/nodes.conf rm -f /usr/redis/cluster/7001/redis7001/src/nodes.conf rm -f /usr/redis/cluster/7000/redis7000/src/nodes.conf rm -f /usr/redis/cluster/7003/redis7003/src/nodes.conf find / -name nodes.conf ? #創建集群 #!/bin/sh cd /usr/redis/cluster/7000/redis7000/src/ ./redis-server ../redis.conf cd /usr/redis/cluster/7001/redis7001/src/ ./redis-server ../redis.conf cd /usr/redis/cluster/7002/redis7002/src/ ./redis-server ../redis.conf cd /usr/redis/cluster/7003/redis7003/src/ ./redis-server ../redis.conf cd /usr/redis/cluster/7004/redis7004/src/ ./redis-server ../redis.conf cd /usr/redis/cluster/7005/redis7005/src/ ./redis-server ../redis.conf cd /usr/redis/cluster/7000/redis7000/src/ ./redis-trib.rb create --replicas 1 192.168.10.102:7000 192.168.10.102:7001 192.168.10.102:7002 192.168.10.102:7003 192.168.10.102:7004 192.168.10.102:7005 ?
#集群啟動關閉： #!/bin/sh /usr/redis/cluster/7000/redis7000/src/redis-cli -p 7000 shutdown /usr/redis/cluster/7001/redis7001/src/redis-cli -p 7001 shutdown /usr/redis/cluster/7002/redis7002/src/redis-cli -p 7002 shutdown /usr/redis/cluster/7003/redis7003/src/redis-cli -p 7003 shutdown /usr/redis/cluster/7004/redis7004/src/redis-cli -p 7004 shutdown /usr/redis/cluster/7005/redis7005/src/redis-cli -p 7005 shutdown if [ $(ps -ef | grep -c redis | grep -cv grep) -gt 1 ] then echo "集群關機失敗，請檢查節點" else ?echo "集群全部關閉，ok" fi ? //集群搭建教程?http://redis.io/topics/cluster-tutorial

//集群搭建教程?http://blog.csdn.net/yubinpll9110/article/details/51373890

?

?這里創建6個redis節點，其中三個為主節點，三個為從節點。

??? redis和端口對應關系：

??? 主服務器

??? 127.0.0.1:7000

??? 127.0.0.1:7001

??? 127.0.0.1:7002

??? 從服務器：
??? 127.0.0.1:7003
??? 127.0.0.1:7004
??? 127.0.0.1:7005

??? 步驟：
??? 1,下載redis。官網下載3.0.0版本，之前幾的版本不支持集群模式

??? 下載地址：http://download.redis.io/releases/redis-3.0.0.tar.gz
??? 2：上傳服務器，解壓，編譯
??? tar -zxvf redis-3.0.0-rc2.tar.gz
??? mv redis-3.0.0-rc2.tar.gz redis3.0
??? cd /usr/local/redis3.0
??? make & make install


??? 3：創建集群需要的目錄并拷貝redis
??? mkdir -p /usr/local/cluster
??? mkdir -p /usr/local/cluster/7000
??? mkdir -p /usr/local/cluster/7001
??? mkdir -p /usr/local/cluster/7002
??? mkdir -p /usr/local/cluster/7003
??? mkdir -p /usr/local/cluster/7004
??? mkdir -p /usr/local/cluster/7005
??? cp -rf /usr/local/redis3.0/* /usr/local/cluster/7000/
??? cp -rf /usr/local/redis3.0/* /usr/local/cluster/7001/
??? cp -rf /usr/local/redis3.0/* /usr/local/cluster/7002/
??? cp -rf /usr/local/redis3.0/* /usr/local/cluster/7003/
??? cp -rf /usr/local/redis3.0/* /usr/local/cluster/7004/
??? cp -rf /usr/local/redis3.0/* /usr/local/cluster/7005/


??? 4：修改配置文件redis.conf

??? vi /usr/local/cluster/7000/redis.conf

??? ##修改配置文件中的下面選項
??? port 7000
??? daemonize yes
??? cluster-enabled yes
??? cluster-config-file nodes.conf
??? cluster-node-timeout 5000
??? appendonly yes


??? #同樣再對其它配置文件進行修改
??? vi /usr/local/cluster/7001/redis.conf
??? vi /usr/local/cluster/7002/redis.conf
??? vi /usr/local/cluster/7003/redis.conf
??? vi /usr/local/cluster/7004/redis.conf
??? vi /usr/local/cluster/7005/redis.conf
??? ##注意：不同的目錄配置不同的redis.conf中的port


??? 5：啟動6個redis

??? cd /usr/local/cluster/7000/src
??? redis-server ../redis.conf
??? cd /usr/local/cluster/7001/src
??? redis-server ../redis.conf
??? cd /usr/local/cluster/7002/src
??? redis-server ../redis.conf
??? cd /usr/local/cluster/7003/src
??? redis-server ../redis.conf
??? cd /usr/local/cluster/7004/src
??? redis-server ../redis.conf
??? cd /usr/local/cluster/7005/src
??? redis-server ../redis.conf

??? ##啟動之后使用命令查看redis的啟動情況ps -ef|grep redis


??? 6,創建redis集群
??? cd /usr/local/redis3.0/src
??? ./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005

??? 6.1執行上面的命令的時候會報錯，因為是執行的的腳本，需要
??? 錯誤內容：/usr/bin/env: ruby: No such file or directory
??? 所以需要安裝ruby的環境，這里推薦使用yum install ruby


??? yum install ruby


??? 6.2然后再執行第步的創建集群命令，還會報錯，提示缺少rubygems組件
??? 錯誤內容：
??? ./redis-trib.rb:24:in `require': no such file to load -- rubygems (LoadError)
??? from ./redis-trib.rb:24
??? yum install rubygems


??? 6.3再次執行第步的命令，還會報錯，提示不能加載redis，是因為缺少redis的接口
??? 錯誤內容：
??? /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- redis (LoadError)
??? from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
??? from ./redis-trib.rb:25


??? gem install redis
??? 這里可能無法安裝,因為無法連接gem服務器：
??? [@zw_22_90 src]# gem install redis --version 3.0.0
??? ERROR: Could not find a valid gem 'redis' (= 3.0.0) in any repository
??? ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)

如何使用？

$ gem sources --remove https://rubygems.org/ $ gem sources -a https://ruby.taobao.org/ $ gem sources -l *** CURRENT SOURCES ***https://ruby.taobao.org # 請確保只有 ruby.taobao.org $ gem install rails


??? 6.4 再次執行第步的命令，正常執行
??? 輸入yes，然后配置完成。
??? [@zw_22_90 src]# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
??? >>> Creating cluster
??? Connecting to node 127.0.0.1:7000: OK
??? Connecting to node 127.0.0.1:7001: OK
??? Connecting to node 127.0.0.1:7002: OK
??? Connecting to node 127.0.0.1:7003: OK
??? Connecting to node 127.0.0.1:7004: OK
??? Connecting to node 127.0.0.1:7005: OK
??? >>> Performing hash slots allocation on 6 nodes...
??? Using 3 masters:
??? 127.0.0.1:7000
??? 127.0.0.1:7001
??? 127.0.0.1:7002
??? Adding replica 127.0.0.1:7003 to 127.0.0.1:7000
??? Adding replica 127.0.0.1:7004 to 127.0.0.1:7001
??? Adding replica 127.0.0.1:7005 to 127.0.0.1:7002
??? M: 2022f24d581b4a7c3342e3245c32927cbd5ec16d 127.0.0.1:7000
??? slots:0-5460 (5461 slots) master
??? M: 37b7008f80f8c21a698da8cb1f1b32db8c0c415c 127.0.0.1:7001
??? slots:5461-10922 (5462 slots) master
??? M: ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd 127.0.0.1:7002
??? slots:10923-16383 (5461 slots) master
??? S: b5b76d70bbb0dbf3e7df8a38f1259e95e2054721 127.0.0.1:7003
??? replicates 2022f24d581b4a7c3342e3245c32927cbd5ec16d
??? S: 6881f8fef9c25da486f320ebf2ead39c1502db4c 127.0.0.1:7004
??? replicates 37b7008f80f8c21a698da8cb1f1b32db8c0c415c
??? S: f090526d32cced97731eef2a2e1722a7bac7d9ea 127.0.0.1:7005
??? replicates ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd
??? 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 127.0.0.1:7000)
??? M: 2022f24d581b4a7c3342e3245c32927cbd5ec16d 127.0.0.1:7000
??? slots:0-5460 (5461 slots) master
??? M: 37b7008f80f8c21a698da8cb1f1b32db8c0c415c 127.0.0.1:7001
??? slots:5461-10922 (5462 slots) master
??? M: ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd 127.0.0.1:7002
??? slots:10923-16383 (5461 slots) master
??? M: b5b76d70bbb0dbf3e7df8a38f1259e95e2054721 127.0.0.1:7003
??? slots: (0 slots) master
??? replicates 2022f24d581b4a7c3342e3245c32927cbd5ec16d
??? M: 6881f8fef9c25da486f320ebf2ead39c1502db4c 127.0.0.1:7004
??? slots: (0 slots) master
??? replicates 37b7008f80f8c21a698da8cb1f1b32db8c0c415c
??? M: f090526d32cced97731eef2a2e1722a7bac7d9ea 127.0.0.1:7005
??? slots: (0 slots) master
??? replicates ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd
??? [OK] All nodes agree about slots configuration.
??? >>> Check for open slots...
??? >>> Check slots coverage...
??? [OK] All 16384 slots covered.


??? 至此redis集群即搭建成功！


??? 7，redis-cli命令進入集群環境
??? [@zw_22_90 src]# redis-cli -c -p 7000

??? 127.0.0.1:7000> quit;

?

?

?

?

?

?

?

?

轉載于:https://www.cnblogs.com/ClearX/p/5803515.html

總結

以上是生活随笔為你收集整理的Redis 3.0.2集群搭建以及相关问题汇总的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。