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redis cluster搭建

編輯:關於android開發

redis cluster搭建


從redis官網看最新穩定版本已經更新到3.2.6了,我這裡補充一篇以前3.2.0的集群配置。
說明:

redis從3.0版本以後開始支持cluster模式,原理和功能大家可以上網查,對於運維人員來說最重要的去掉了代理層、避免出現單點故障,但是redis cluster至少需要三個主節點和三個從節點。每一對主從形成一組關系。因此需要三台服務器,每台服務器上兩個實例。因為一個主對應一個從,所以一台服務器上不能同時是一個主和從,必須三台服務器分開主從,來保證服務的正常運行。我這裡為了演示方便就在一台服務器上部署。注意:生產環境必須是三台機器,不然達不到高可用。

部署環境:

主機名

IP地址

操作系統版本

用途

test01

192.168.2.9

CentOS6.3(64位)

實例 7000/7001

test02

192.168.2.10

CentOS 6.3(64位)

實例 7002/7003

test03

192.168.2.7

CentOS 6.3(64位)

實例 7004/7005

部署步驟:

1、編譯安裝redis。

把安裝包放在/data/下解壓並編譯

  1. [root@test01 data]# tar -zxf redis-3.2.0.tar.gz
  2. [root@test01 redis]# cd redis-3.2.0
  3. [root@test01 redis-3.2.0]# make && make install
  4. [root@test01 redis]# ln -s /data/redis/redis-3.2.0 /usr/local/redis
2、創建redis集群節點
  1. [root@test01 local]# mkdir redis_cluster
  2. [root@test01 local]# cd redis_cluster/
  3. [root@test01 redis_cluster]# mkdir 7000 7001
3、復制默認的節點配置文件到集群節點中
  1. [root@test01 redis_cluster]# cp /usr/local/redis/redis.conf ./7000

4、修改默認配置文件

  1. [root@test01 7000]# vim redis.conf
  2. daemonize yes //redis後台運行
  3. pidfile /var/run/redis_7000.pid //pidfile文件對應7000
  4. port 7000 //端口7000
  5. cluster-enabled yes //開啟集群 把注釋#去掉
  6. cluster-config-file nodes.conf //集群的配置 配置文件首次啟動自動生成
  7. cluster-node-timeout 6000 //請求超時
  8. appendonly yes //日志開啟,環境測試開啟,正式環境建議關閉
  9. bind 192.168.2.9 //修改監聽的地址為本機地址

5、修改完後把配置文件復制到7001上並修改相應的端口。

  1. [root@test01 7000]# cp redis.conf../7001/

6、另外兩台服務器重復上面配置。

7、啟動各個節點,注意一定要到端口目錄下去啟動,不然有的啟動不起來。

  1. [root@test01 7000]# /usr/local/redis/src/redis-server redis.conf
  2. [root@test01 7000]# cd ../7001/
  3. [root@test01 7001]# /usr/local/redis/src/redis-server redis.conf

查看啟動進程

  1. [root@test01 7001]# ps -ef|grep redis
  2. root 8858 1 0 11:38 ? 00:00:00 /usr/local/redis/src/redis-server 192.168.2.9:7000 [cluster]
  3. root 8865 1 0 11:39 ? 00:00:00 /usr/local/redis/src/redis-server 192.168.2.9:7001 [cluster]
  4. root 8870 27799 0 11:39 pts/1 00:00:00 grep redis

再分別啟動其余服務器節點。

8、創建集群必須的軟件,三台服務器都執行

  1. [root@test01 7000]# yum -y install ruby ruby-devel rubygems rpm-build
  2. [root@test01 7000]# ruby -v
  3. ruby 1.8.7 (2013-06-27 patchlevel 374) [x86_64-linux]
  4. [root@redis 7000]# rpm -qa|grep rubyge
  5. rubygems-1.3.7-5.el6.noarch
  6. [root@redis 7000]# gem install redis
  7. Successfully installed redis-3.3.0
  8. 1 gem installed
  9. Installing ri documentation for redis-3.3.0...
  10. Installing RDoc documentation for redis-3.3.0.
9、確認所有的節點都啟動,接下來使用參數create 創建
  1. [root@test01 7000]# /usr/local/redis/src/redis-trib.rb create --replicas 1 192.168.2.9:7000 192.168.2.10:7002 192.168.2.7:7004 192.168.2.10:7003 192.168.2.7:7005 192.168.2.9:7001
  2. >>> Creating cluster
  3. >>> Performing hash slots allocation on 6 nodes...
  4. Using 3 masters:
  5. 192.168.2.7:7004
  6. 192.168.2.9:7000
  7. 192.168.2.10:7002
  8. Adding replica 192.168.2.9:7001 to 192.168.2.7:7004
  9. Adding replica 192.168.2.7:7005 to 192.168.2.9:7000
  10. Adding replica 192.168.2.10:7003 to 192.168.2.10:7002
  11. M: bede5b72dfbb5274e52a1f0c5f6b43170afec8af 192.168.2.9:7000
  12. slots:5461-10922 (5462 slots) master
  13. M: 01594f84df9e743a74a47f9aaa58fa41402dfe25 192.168.2.10:7002
  14. slots:10923-16383 (5461 slots) master
  15. M: 27cedfdc0a648b9141736f156a4d89828d7bf695 192.168.2.7:7004
  16. slots:0-5460 (5461 slots) master
  17. S: 6f13ca12a9be3b0c093d02c81fed337307f295af 192.168.2.10:7003
  18. replicates 01594f84df9e743a74a47f9aaa58fa41402dfe25
  19. S: 00333fa0ac74863e86c3108f6040abe1183a2b9b 192.168.2.7:7005
  20. replicates bede5b72dfbb5274e52a1f0c5f6b43170afec8af
  21. S: f167b98d8f78bfdb4c1823c0d6be7f1a12aff194 192.168.2.9:7001
  22. replicates 27cedfdc0a648b9141736f156a4d89828d7bf695
  23. Can I set the above configuration? (type 'yes' to accept): yes
  24. >>> Nodes configuration updated
  25. >>> Assign a different config epoch to each node
  26. >>> Sending CLUSTER MEET messages to join the cluster
  27. Waiting for the cluster to join...
  28. >>> Performing Cluster Check (using node 192.168.2.9:7000)
  29. M: bede5b72dfbb5274e52a1f0c5f6b43170afec8af 192.168.2.9:7000
  30. slots:5461-10922 (5462 slots) master
  31. M: 01594f84df9e743a74a47f9aaa58fa41402dfe25 192.168.2.10:7002
  32. slots:10923-16383 (5461 slots) master
  33. M: 27cedfdc0a648b9141736f156a4d89828d7bf695 192.168.2.7:7004
  34. slots:0-5460 (5461 slots) master
  35. M: 6f13ca12a9be3b0c093d02c81fed337307f295af 192.168.2.10:7003
  36. slots: (0 slots) master
  37. replicates 01594f84df9e743a74a47f9aaa58fa41402dfe25
  38. M: 00333fa0ac74863e86c3108f6040abe1183a2b9b 192.168.2.7:7005
  39. slots: (0 slots) master
  40. replicates bede5b72dfbb5274e52a1f0c5f6b43170afec8af
  41. M: f167b98d8f78bfdb4c1823c0d6be7f1a12aff194 192.168.2.9:7001
  42. slots: (0 slots) master
  43. replicates 27cedfdc0a648b9141736f156a4d89828d7bf695
  44. [OK] All nodes agree about slots configuration.
  45. >>> Check for open slots...
  46. >>> Check slots coverage...
  47. [OK] All 16384 slots covered.

--replicas 1 創建集群指定一個從節點。

因為創建集群的時候不能指定主從,它是隨機的。加入集群的節點順序不分前後,如果一台服務器上正好有主節點和從節點,而且是一組的話,必須將同一台服務器上的主從節點踢掉,換成不同服務器的節點。
從上面可以看到很不辛7003和7002分配了一台服務器上。經過測試一般都會有一台服務器上存在同一組的主和從節點。
主從關系圖:
192.168.2.10:7002 192.168.2.10:7003
192.168.2.9:7000 192.168.2.7:7005
192.168.2.7:7004 192.168.2.9:7001

10、我們把192.168.2.10:7003和192.168.2.7:7005調換下。

刪除7003節點

  1. [root@test01 7000]# /usr/local/redis/src/redis-trib.rb del-node 192.168.2.10:7003 6f13ca12a9be3b0c093d02c81fed337307f295af
  2. >>> Removing node 6f13ca12a9be3b0c093d02c81fed337307f295af from cluster 192.168.2.10:7003
  3. >>> Sending CLUSTER FORGET messages to the cluster...
  4. >>> SHUTDOWN the node.

del-node 刪除節點後面跟主機和對應的端口還有實例的id。這樣才能刪除。

11、修改192.168.2.7:7005的主為192.168.2.10:7002

進入192.168.2.7:7005的redis

  1. [root@test02 redis_cluster]# /usr/local/redis/src/redis-cli -c -p 7005 -h 192.168.2.7
  2. 192.168.2.7:7005> cluster replicate 01594f84df9e743a74a47f9aaa58fa41402dfe25 #新主的id
  3. OK

查看現在主從狀態

  1. [root@test02 redis_cluster]# /usr/local/redis/src/redis-trib.rb check 192.168.2.10:7002
  2. >>> Performing Cluster Check (using node 192.168.2.10:7002)
  3. M: 01594f84df9e743a74a47f9aaa58fa41402dfe25 192.168.2.10:7002
  4. slots:10923-16383 (5461 slots) master
  5. 1 additional replica(s)
  6. M: bede5b72dfbb5274e52a1f0c5f6b43170afec8af 192.168.2.9:7000
  7. slots:5461-10922 (5462 slots) master
  8. 0 additional replica(s)
  9. M: 27cedfdc0a648b9141736f156a4d89828d7bf695 192.168.2.7:7004
  10. slots:0-5460 (5461 slots) master
  11. 1 additional replica(s)
  12. S: f167b98d8f78bfdb4c1823c0d6be7f1a12aff194 192.168.2.9:7001
  13. slots: (0 slots) slave
  14. replicates 27cedfdc0a648b9141736f156a4d89828d7bf695
  15. S: 00333fa0ac74863e86c3108f6040abe1183a2b9b 192.168.2.7:7005
  16. slots: (0 slots) slave
  17. replicates 01594f84df9e743a74a47f9aaa58fa41402dfe25
  18. [OK] All nodes agree about slots configuration.
  19. >>> Check for open slots...
  20. >>> Check slots coverage...
  21. [OK] All 16384 slots covered.

可以看到主從關系已經改變。

12、再添加剛刪除的7003節點。

  1. [root@test02 redis_cluster]# ps -ef|grep redis
  2. root 4441 1 0 11:45 ? 00:00:13 /usr/local/redis/src/redis-server 192.168.2.10:7002 [cluster]
  3. root 4673 4275 0 15:02 pts/0 00:00:00 grep redis
  4. [root@test02 redis_cluster]# cd 7003/
  5. [root@test02 7003]# ls
  6. appendonly.aof dump.rdb nodes.conf redis.conf
  7. [root@test02 7003]# rm -f appendonly.aof dump.rdb nodes.conf
  8. [root@test02 7003]# /usr/local/redis/src/redis-server redis.conf
  9. [root@test02 7003]# ps -ef|grep redis
  10. root 4441 1 0 11:45 ? 00:00:14 /usr/local/redis/src/redis-server 192.168.2.10:7002 [cluster]
  11. root 4677 1 0 15:02 ? 00:00:00 /usr/local/redis/src/redis-server 192.168.2.10:7003 [cluster]
  12. root 4681 4275 0 15:02 pts/0 00:00:00 grep redis

13、執行下列命令添加從指定的主節點。

  1. [root@test02 7003]# /usr/local/redis/src/redis-trib.rb add-node --slave --master-id bede5b72dfbb5274e52a1f0c5f6b43170afec8af 192.168.2.10:7003 192.168.2.9:7000
  2. >>> Adding node 192.168.2.7:7005 to cluster 192.168.2.9:7000
  3. >>> Performing Cluster Check (using node 192.168.2.9:7000)
  4. M: bede5b72dfbb5274e52a1f0c5f6b43170afec8af 192.168.2.9:7000
  5. slots:5461-10922 (5462 slots) master
  6. 0 additional replica(s)
  7. S: f167b98d8f78bfdb4c1823c0d6be7f1a12aff194 192.168.2.9:7001
  8. slots: (0 slots) slave
  9. replicates 27cedfdc0a648b9141736f156a4d89828d7bf695
  10. S: 00333fa0ac74863e86c3108f6040abe1183a2b9b 192.168.2.7:7005
  11. slots: (0 slots) slave
  12. replicates 01594f84df9e743a74a47f9aaa58fa41402dfe25
  13. M: 27cedfdc0a648b9141736f156a4d89828d7bf695 192.168.2.7:7004
  14. slots:0-5460 (5461 slots) master
  15. 1 additional replica(s)
  16. M: 01594f84df9e743a74a47f9aaa58fa41402dfe25 192.168.2.10:7002
  17. slots:10923-16383 (5461 slots) master
  18. 1 additional replica(s)
  19. [OK] All nodes agree about slots configuration.
  20. >>> Check for open slots...
  21. >>> Check slots coverage...
  22. [OK] All 16384 slots covered.
  23. >>> Send CLUSTER MEET to node 192.168.2.10:7003 to make it join the cluster.
  24. Waiting for the cluster to join.
  25. >>> Configure node as replica of 192.168.2.9:7000.
  26. [OK] New node added correctly.

從上面顯示7003節點成為7000的從節點。

14、查看主從現在情況

  1. [root@test02 7003]# /usr/local/redis/src/redis-trib.rb check 192.168.2.10:7002
  2. >>> Performing Cluster Check (using node 192.168.2.10:7002)
  3. M: 01594f84df9e743a74a47f9aaa58fa41402dfe25 192.168.2.10:7002
  4. slots:10923-16383 (5461 slots) master
  5. 1 additional replica(s)
  6. M: bede5b72dfbb5274e52a1f0c5f6b43170afec8af 192.168.2.9:7000
  7. slots:5461-10922 (5462 slots) master
  8. 1 additional replica(s)
  9. S: 2e26f92f8dca2dfb13f159a59b6260f106bc8cb4 192.168.2.10:7003
  10. slots: (0 slots) slave
  11. replicates bede5b72dfbb5274e52a1f0c5f6b43170afec8af
  12. M: 27cedfdc0a648b9141736f156a4d89828d7bf695 192.168.2.7:7004
  13. slots:0-5460 (5461 slots) master
  14. 1 additional replica(s)
  15. S: f167b98d8f78bfdb4c1823c0d6be7f1a12aff194 192.168.2.9:7001
  16. slots: (0 slots) slave
  17. replicates 27cedfdc0a648b9141736f156a4d89828d7bf695
  18. S: 00333fa0ac74863e86c3108f6040abe1183a2b9b 192.168.2.7:7005
  19. slots: (0 slots) slave
  20. replicates 01594f84df9e743a74a47f9aaa58fa41402dfe25
  21. [OK] All nodes agree about slots configuration.
  22. >>> Check for open slots...
  23. >>> Check slots coverage...
  24. [OK] All 16384 slots covered
這樣就是一個正常的集群了~~運維人員再也不會因為宕機或者redis掛了的問題頭疼了!













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