redis集群搭建

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    为了保证可以进行投票,需要至少3个主节点。每个主节点都需要至少一个从节点,所以需要至少3个从节点所以一共需要6台redis服务器,为了模拟6个redis节点,我们可以使用6个redis实例作为节点。6个redis实例的端口号,7001~7006.

    首先在我们的linux中安装一个redis,如果不会的同学,可以去看我之前的博客《redis安装-单机版》然后: 

    1. 把bin目录里面的rdb,和aof文件删除,准备干净的redis

    [root@localhost bin]# rm -rf appendonly.aof

    [root@localhost bin]# rm -f dump.rdb 

    完事效果如下:

    

    退出到上级目录,将bin复制6份

     把bin复制6份

    [root@localhost bin]# cd ..

    如果没有redis-cluster文件夹的话需要创建一个

    [root@localhost redis]# mkdir redis-cluster

    [root@localhost redis]# cp -r bin redis-cluster/redis1

    [root@localhost redis]# cp -r bin redis-cluster/redis2

    [root@localhost redis]# cp -r bin redis-cluster/redis3

    [root@localhost redis]# cp -r bin redis-cluster/redis4

    [root@localhost redis]# cp -r bin redis-cluster/redis5

    [root@localhost redis]# cp -r bin redis-cluster/redis6

    这个时候,我们进入redis-cluster目录下看到的结果是这样的:

   

    现在,为了让这6个redis节点运行的时候不起节点的冲突,我们需要修改它们的节点端口号。将端口号一次修改为7001~7006

   首先打开第一个节点的redis.conf 配置文件:[root@itcast-01 redis-cluster]# vim redis1/redis.conf

   将端口号修改为7001(将这的6379改为7001)

    

  剩下的代码用同样的方法修改即可。

  分别启动6个redis节点的服务,或者是写一个脚本,然后给脚本附上执行权限,然后用脚本启动也可以。

 准备集群安装环境

  redis集群的管理工具使用的是ruby脚本语言,安装集群需要ruby环境。

  安装ruby环境[root@itcast-01 redis-cluster]# yum install ruby

  安装Ruby的打包系统[root@itcast-01 redis-cluster]# yum install rubygems

  下载一个redis-3.0.0.gem的文件,然后将文件上传,再执行命令安转。

  

  [root@itcast-01 ~]# gem install redis-3.0.0.gem 

   

  安装集群

   修改这6个实例的redis.conf配置文件,开启redis-cluster

  [root@localhost redis-cluster]# vim redis1/redis.conf

   

  然后再次重启实例

  集群管理工具在redis解压文件夹的src的文件夹中,使用redis-cluster的集群管理工具启动集群

   

  先进入集群管理工具所在的路径:[root@localhost redis-cluster]# cd /root/redis-3.0.0/src/

  再启动命令:[root@localhost src]# ./redis-trib.rb create --replicas 1 192.168.37.161:7001 192.168.37.161:7002 192.168.37.161:7003 192.168.37.161:7004 192.168.37.161:7005 192.168.37.161:7006

   此时的启动信息如下:

  

>>> Creating cluster
Connecting to node 192.168.37.131:7001: OK
Connecting to node 192.168.37.131:7002: OK
Connecting to node 192.168.37.131:7003: OK
Connecting to node 192.168.37.131:7004: OK
Connecting to node 192.168.37.131:7005: OK
Connecting to node 192.168.37.131:7006: OK
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.37.131:7001
192.168.37.131:7002
192.168.37.131:7003
Adding replica 192.168.37.131:7004 to 192.168.37.131:7001
Adding replica 192.168.37.131:7005 to 192.168.37.131:7002
Adding replica 192.168.37.131:7006 to 192.168.37.131:7003
M: 955567f988830cdf4328854f815719ea28082ca8 192.168.37.131:7001
   slots:0-5460 (5461 slots) master
M: 4f3eeced04b930aa48193699301745a05a70697a 192.168.37.131:7002
   slots:5461-10922 (5462 slots) master
M: 871a684dbbc0f43dcc16107710d7bd2f4e6de76a 192.168.37.131:7003
   slots:10923-16383 (5461 slots) master
S: baca3ce2223dfcd9c636a7193b12998b1dbb2431 192.168.37.131:7004
   replicates 955567f988830cdf4328854f815719ea28082ca8
S: 0b599863ddf2e03b0326c75b874a1af8ae430d2e 192.168.37.131:7005
   replicates 4f3eeced04b930aa48193699301745a05a70697a
S: 92f712d954c62f2743e2e572f6582a6ef9a163e0 192.168.37.131:7006
   replicates 871a684dbbc0f43dcc16107710d7bd2f4e6de76a
Can I set the above configuration? (type \'yes\' to accept):
>>> Creating cluster
Connecting to node 192.168.37.131:7001: OK
Connecting to node 192.168.37.131:7002: OK
Connecting to node 192.168.37.131:7003: OK
Connecting to node 192.168.37.131:7004: OK
Connecting to node 192.168.37.131:7005: OK
Connecting to node 192.168.37.131:7006: OK
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.37.131:7001
192.168.37.131:7002
192.168.37.131:7003
Adding replica 192.168.37.131:7004 to 192.168.37.131:7001
Adding replica 192.168.37.131:7005 to 192.168.37.131:7002
Adding replica 192.168.37.131:7006 to 192.168.37.131:7003
M: 955567f988830cdf4328854f815719ea28082ca8 192.168.37.131:7001
   slots:0-5460 (5461 slots) master
M: 4f3eeced04b930aa48193699301745a05a70697a 192.168.37.131:7002
   slots:5461-10922 (5462 slots) master
M: 871a684dbbc0f43dcc16107710d7bd2f4e6de76a 192.168.37.131:7003
   slots:10923-16383 (5461 slots) master
S: baca3ce2223dfcd9c636a7193b12998b1dbb2431 192.168.37.131:7004
   replicates 955567f988830cdf4328854f815719ea28082ca8
S: 0b599863ddf2e03b0326c75b874a1af8ae430d2e 192.168.37.131:7005
   replicates 4f3eeced04b930aa48193699301745a05a70697a
S: 92f712d954c62f2743e2e572f6582a6ef9a163e0 192.168.37.131:7006
   replicates 871a684dbbc0f43dcc16107710d7bd2f4e6de76a
Can I set the above configuration? (type \'yes\' to accept):

  输入yes,然后回车,又是一大堆的提示信息:

 

>>> 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 192.168.37.131:7001)
M: 955567f988830cdf4328854f815719ea28082ca8 192.168.37.131:7001
   slots:0-5460 (5461 slots) master
M: 4f3eeced04b930aa48193699301745a05a70697a 192.168.37.131:7002
   slots:5461-10922 (5462 slots) master
M: 871a684dbbc0f43dcc16107710d7bd2f4e6de76a 192.168.37.131:7003
   slots:10923-16383 (5461 slots) master
M: baca3ce2223dfcd9c636a7193b12998b1dbb2431 192.168.37.131:7004
   slots: (0 slots) master
   replicates 955567f988830cdf4328854f815719ea28082ca8
M: 0b599863ddf2e03b0326c75b874a1af8ae430d2e 192.168.37.131:7005
   slots: (0 slots) master
   replicates 4f3eeced04b930aa48193699301745a05a70697a
M: 92f712d954c62f2743e2e572f6582a6ef9a163e0 192.168.37.131:7006
   slots: (0 slots) master
   replicates 871a684dbbc0f43dcc16107710d7bd2f4e6de76a
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

   这时,我们的集群就算是安装成功了。

  测试

   使用redis命令行客户端连接

  [root@localhost bin]# ./redis-cli -h 192.168.37.131 -p 7006 -c

  192.168.37.131:7006> set hello money

  -> Redirected to slot [866] located at 192.168.37.131:7001

  OK

   一定要加-c参数,节点之间就可以互相跳转

   这就表示我们的集群搭建成功了,而且,自动将访问7001端口的那个请求跳转到7006.并且保存成功。

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