redis集群的测试

原文：http://blog.sina.com.cn/s/blog_53b45c4d0102wg10.html

1、测试存取值

客户端连接集群redis-cli需要带上 -c ，redis-cli -c -p 端口号

[root@localhost redis01]# ./redis-cli -c -p 7001

127.0.0.1:7001> set name andy

-> Redirected to slot [5798] located at 127.0.0.1:7002

OK

127.0.0.1:7002> get name

"andy"

127.0.0.1:7002>

根据redis-cluster的key值分配，name应该分配到节点7002[5461-10922]上，上面显示redis cluster自动从7001跳转到了7002节点。

我们可以测试一下7006从节点获取name值

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[root@localhost redis06]# ./redis-cli -c -p 7006

127.0.0.1:7006> get name

-> Redirected to slot [5798] located at 127.0.0.1:7002

"andy"

127.0.0.1:7002>

7006位7003的从节点，从上面也是自动跳转至7002获取值，这也是redis cluster的特点，它是去中心化，每个节点都是对等的，连接哪个节点都可以获取和设置数据。

四、集群节点选举

现在模拟将7002节点挂掉，按照redis-cluster原理会选举会将 7002的从节点7005选举为主节点。

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[root@localhost redis-cluster]# ps -ef | grep redis

root 7950 1 0 12:50 ? 00:00:28 ./redis-server 127.0.0.1:7001 [cluster]

root 7952 1 0 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7002 [cluster]

root 7956 1 0 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7003 [cluster]

root 7960 1 0 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7004 [cluster]

root 7964 1 0 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7005 [cluster]

root 7966 1 0 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7006 [cluster]

root 11346 10581 0 14:57 pts/2 00:00:00 grep --color=auto redis

[root@localhost redis-cluster]# kill 7952

在查看集群中的7002节点

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[root@localhost redis-cluster]#

[root@localhost redis-cluster]# ./redis-trib.rb check 127.0.0.1:7002

[ERR] Sorry, can't connect to node 127.0.0.1:7002

[root@localhost redis-cluster]# ./redis-trib.rb check 127.0.0.1:7005

>>> Performing Cluster Check (using node 127.0.0.1:7005)

M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005

slots:5461-10922 (5462 slots) master

0 additional replica(s)

S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004

slots: (0 slots) slave

replicates dd19221c404fb2fc4da37229de56bab755c76f2b

M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003

slots:10923-16383 (5461 slots) master

1 additional replica(s)

M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001

slots:0-5460 (5461 slots) master

1 additional replica(s)

S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006

slots: (0 slots) slave

replicates f9886c71e98a53270f7fda961e1c5f730382d48f

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

[root@localhost redis-cluster]#

可以看到集群连接不了7002节点，而7005有原来的S转换为M节点，代替了原来的7002节点。我们可以获取name值：

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[root@localhost redis01]# ./redis-cli -c -p 7001

127.0.0.1:7001> get name

-> Redirected to slot [5798] located at 127.0.0.1:7005

"andy"

127.0.0.1:7005>

127.0.0.1:7005>

从7001节点连入，自动跳转到7005节点，并且获取name值。

现在我们将7002节点恢复，看是否会自动加入集群中以及充当的M还是S节点。

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[root@localhost redis-cluster]# cd redis02

[root@localhost redis02]# ./redis-server redis.conf

[root@localhost redis02]#

在check一下7002节点

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[root@localhost redis-cluster]# ./redis-trib.rb check 127.0.0.1:7002

>>> Performing Cluster Check (using node 127.0.0.1:7002)

S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002

slots: (0 slots) slave

replicates a5db243087d8bd423b9285fa8513eddee9bb59a6

M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003

slots:10923-16383 (5461 slots) master

1 additional replica(s)

M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005

slots:5461-10922 (5462 slots) master

1 additional replica(s)

S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004

slots: (0 slots) slave

replicates dd19221c404fb2fc4da37229de56bab755c76f2b

S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006

slots: (0 slots) slave

replicates f9886c71e98a53270f7fda961e1c5f730382d48f

M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001

slots:0-5460 (5461 slots) master

1 additional replica(s)

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

[root@localhost redis-cluster]#

可以看到7002节点变成了a5db243087d8bd423b9285fa8513eddee9bb59a6 7005的从节点。