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虚拟机模拟redis集群

作者:互联网

​  实践是检验真理的唯一标准,作为redis的初学者,在学习redis集群的时候,希望能够自己搭建一个redis集群,但只有一台电脑,所以想出使用虚拟机去模拟redis集群,相当于构建一个伪集群。

(伪)集群搭建步骤

1 搭建所需环境

VM虚拟机(这里操作系统选用的是CentOs7)

安装redies

注:为避免权限问题,后期操作均使用root账户

2 创建集群目录

为方便对文件的管理,新建一个集群目录

[root@centOSyangsensen redis]# mkdir redis-cluster/
[root@centOSyangsensen redis]# ls
redis  redis-cluster

3 将已经安装好的redis复制到集群目录下

至少3台主机才可以配置集群,如果每台主机再配置一台从机的话,那么就需要6台主机,这里创建6个redis实例来代替六台主机,每个实例使用不同的端口号,设计端口如下,黑色为主机,绿色为从机,端口号7001~7006

复制文件

[root@centOSyangsensen redis]# cp redis redis-cluster/7001 -r
[root@centOSyangsensen redis]# cd redis-cluster/7001/
[root@centOSyangsensen 7001]# ls
bin  dump.rdb  nodes.conf  redis.conf

4 如果存在持久化文件(只保留bin文件夹和redis.conf文件即可)

[root@centOSyangsensen 7001]# rm -rf dump.rdb nodes.conf 
[root@centOSyangsensen 7001]# ls
bin  redis.conf

5 修改redis.conf配置文件

需要修改三处,分别是是否接受集群(Cluster-enable),绑定ip(bind),端口号(port),以及一些文件目录

打开集群

在这里插入图片描述

设置IP,ip为虚拟机的IP

在这里插入图片描述

设置端口号

在这里插入图片描述

修改文件目录(这里不修改,待会可能打不开第二台机器)

在这里插入图片描述

保存退出

6 由7001复制出7002~7006机器

[root@centOSyangsensen redis-cluster]# cp 7001/ 7002 -r
[root@centOSyangsensen redis-cluster]# cp 7001/ 7003 -r
[root@centOSyangsensen redis-cluster]# cp 7001/ 7004 -r
[root@centOSyangsensen redis-cluster]# cp 7001/ 7005 -r
[root@centOSyangsensen redis-cluster]# cp 7001/ 7006 -r

7 修改7002~7006机器的端口号

修改7002~7006机器的端口号,并修改配置文件中对应的文件目录,与7001中配置一样的步骤

8 分别启动6台机器

9 创建集群(先关闭防火墙)

创建集群,无需在每一台机器都运行集群命令,只需在任一台机器执行redis-cli --cluster命令就够了

命令格式如下

 ./redis-cli --cluster create  ip:port ip:port --cluster-replicas 1

其中–cluster-replicas表示为每台主机配置的从机数量

命令及命令执行过程如下

[root@centOSyangsensen redis-cluster]# cd 7001
[root@centOSyangsensen 7001]# cd bin
[root@centOSyangsensen bin]# ./redis-cli --cluster create  192.168.12.128:7001 192.168.12.128:7002 192.168.12.128:7003 192.168.12.128:7004 192.168.12.128:7005 192.168.12.128:7006 --cluster-replicas 1
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.12.128:7005 to 192.168.12.128:7001
Adding replica 192.168.12.128:7006 to 192.168.12.128:7002
Adding replica 192.168.12.128:7004 to 192.168.12.128:7003
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 63966329ebb2405f38fa03cb1901d8a9bdd0eedb 192.168.12.128:7001
   slots:[0-5460] (5461 slots) master
M: 0bec30bff33dc635608c7cf48e66eaed6c867d5d 192.168.12.128:7002
   slots:[5461-10922] (5462 slots) master
M: 65a2c0d143fa8d9be9be1a70da76744ddfbf9a59 192.168.12.128:7003
   slots:[10923-16383] (5461 slots) master
S: 460bd1fe2564b31c302fe5431a7560e1773798cc 192.168.12.128:7004
   replicates 65a2c0d143fa8d9be9be1a70da76744ddfbf9a59
S: e1cdf6e53ffef7361c0c722909b5bf37f36bb758 192.168.12.128:7005
   replicates 63966329ebb2405f38fa03cb1901d8a9bdd0eedb
S: 48df8c6d3e400a539614b6f418ba7a4004db2df6 192.168.12.128:7006
   replicates 0bec30bff33dc635608c7cf48e66eaed6c867d5d
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 192.168.12.128:7001)
M: 63966329ebb2405f38fa03cb1901d8a9bdd0eedb 192.168.12.128:7001
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
M: 65a2c0d143fa8d9be9be1a70da76744ddfbf9a59 192.168.12.128:7003
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
S: e1cdf6e53ffef7361c0c722909b5bf37f36bb758 192.168.12.128:7005
   slots: (0 slots) slave
   replicates 63966329ebb2405f38fa03cb1901d8a9bdd0eedb
S: 48df8c6d3e400a539614b6f418ba7a4004db2df6 192.168.12.128:7006
   slots: (0 slots) slave
   replicates 0bec30bff33dc635608c7cf48e66eaed6c867d5d
M: 0bec30bff33dc635608c7cf48e66eaed6c867d5d 192.168.12.128:7002
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 460bd1fe2564b31c302fe5431a7560e1773798cc 192.168.12.128:7004
   slots: (0 slots) slave
   replicates 65a2c0d143fa8d9be9be1a70da76744ddfbf9a59
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

注:上面的信息可以看出有三台主机(7001,7002,7003),以及三台从机(7004,7005,7006),其中M表示主机,S表示从机。

10 连接集群

命令(任一连接一台主机):

[root@centOSyangsensen bin]# ./redis-cli -h 192.168.12.128 -p 7001 -c
192.168.12.128:7001> 

-c指的是集群连接

到这里redis集群就全部搭建完毕了,接下里可以存值测试,查看集群信息等等

存值测试

192.168.12.128:7001> set k1 k
-> Redirected to slot [12706] located at 192.168.12.128:7003
OK
192.168.12.128:7003> get k
-> Redirected to slot [7629] located at 192.168.12.128:7002
(nil)
192.168.12.128:7002> get k1
-> Redirected to slot [12706] located at 192.168.12.128:7003
"k"


可以看出虽然连接的是7001机器,当数据会根绝存储位置为你重新连接到其他机器。

标签:虚拟机,redis,12.128,cluster,集群,192.168,7001,slots
来源: https://blog.csdn.net/qq_45267848/article/details/119119271