虚拟机中搭建去中心化Redis伪集群

小鱼儿 2022-10-06 09:50 128阅读 0赞

# 简介：Redis集群 #

Redis 集群实现了对Redis的水平扩容，即启动N个redis节点，将整个数据库分布存储在这N个节点中，每个节点存储总数据的1/N。  
Redis 集群通过分区（partition）来提供一定程度的可用性（availability）： 即使集群中有一部分节点失效或者无法进行通讯， 集群也可以继续处理命令请求。

## 第一步：集群架构设计 ##

制作6个实例，3组主从复制模式，每组2个redis server 实例  
如下图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JyYXZlX2hlYXJ0NHB6ag_size_16_color_FFFFFF_t_70]  
当redis 客户端请求过来的时候，可以到任何一台master上，master根据请求参数进行相互转发，获得相应的请求数据

## 第二步：编写redis server配置文件 ##

以6379 server实例的配置文件为例：

include /usr/local/redis/bin/myconfs/redis.conf
    pidfile "/var/run/redis_6379.pid"
    port 6379
    dbfilename "dump6379.rdb"
    cluster-enabled yes
    cluster-config-file nodes-6379.conf
    cluster-node-timeout 15000

其他几个节点：6380、6381、6389、6390、6391  
配置相同，只是对应的数字变化一下

创建好配置文件之后，启动所有的redis server实例

[root@linuxprobe bin]# ./redis-server ./myconfs/redis6379.conf 
    [root@linuxprobe bin]# ./redis-server ./myconfs/redis6380.conf 
    [root@linuxprobe bin]# ./redis-server ./myconfs/redis6381.conf 
    [root@linuxprobe bin]# ./redis-server ./myconfs/redis6389.conf 
    [root@linuxprobe bin]# ./redis-server ./myconfs/redis6390.conf 
    [root@linuxprobe bin]# ./redis-server ./myconfs/redis6391.conf

检测是否启动成功

[root@linuxprobe bin]# ps -ef | grep redis

![在这里插入图片描述][20210612163009561.png]  
对应的node配置文件也自动生成  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JyYXZlX2hlYXJ0NHB6ag_size_16_color_FFFFFF_t_70 1]

## 第三步：节点合成集群 ##

首先，进入redis解压文件夹中的src目录中  
我的位置是：  
/root/ProjectNeeds/Softwares/Redis/redis-6.2.3/src  
这个目录里，主要用到以下两个工具  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JyYXZlX2hlYXJ0NHB6ag_size_16_color_FFFFFF_t_70 2]  
节点合成集群的命令：

./redis-cli --cluster create --cluster-replicas 1 192.168.0.112:6379 192.168.0.112:6380 192.168.0.112:6381 192.168.0.112:6389 192.168.0.112:6390 192.168.0.112:6391

注意：  
这里IP必须写真实IP，不能用127.0.0.1  
–replicas 1 的作用是，采用最简单的方式配置集群，一台主机，一台从机，正好三组  
该命令需要在src目录里执行

运行成功的话，结果如下：

[root@linuxprobe src]# ./redis-cli --cluster create --cluster-replicas 1 192.168.0.112:6379 192.168.0.112:6380 192.168.0.112:6381 192.168.0.112:6389 192.168.0.112:6390 192.168.0.112:6391
    >>> Performing hash slots allocation on 6 nodes...
    Master[0] -> Slots 0 - 5460
    Master[1] -> Slots 5461 - 10922
    Master[2] -> Slots 10923 - 16383
    Adding replica 192.168.0.112:6390 to 192.168.0.112:6379
    Adding replica 192.168.0.112:6391 to 192.168.0.112:6380
    Adding replica 192.168.0.112:6389 to 192.168.0.112:6381
    >>> Trying to optimize slaves allocation for anti-affinity
    [WARNING] Some slaves are in the same host as their master
    M: 80ac7bf79b0abec10b4183a3a11086452dc1c93f 192.168.0.112:6379
       slots:[0-5460] (5461 slots) master
    M: 4d93a26da64ddfcf6568ea1225138ef435d24b62 192.168.0.112:6380
       slots:[5461-10922] (5462 slots) master
    M: c08c86afe29d6df8867d5c1ac73b1f723e9eb88f 192.168.0.112:6381
       slots:[10923-16383] (5461 slots) master
    S: 8d9216b8972b7eda65daa6115927c877946b13a1 192.168.0.112:6389
       replicates 80ac7bf79b0abec10b4183a3a11086452dc1c93f
    S: 072f85e9e43b64a57daa0b33588fe3d267927b17 192.168.0.112:6390
       replicates 4d93a26da64ddfcf6568ea1225138ef435d24b62
    S: 753b8090296d9fd0b3f12089fb6590f35df582f0 192.168.0.112:6391
       replicates c08c86afe29d6df8867d5c1ac73b1f723e9eb88f
    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 192.168.0.112:6379)
    M: 80ac7bf79b0abec10b4183a3a11086452dc1c93f 192.168.0.112:6379
       slots:[0-5460] (5461 slots) master
       1 additional replica(s)
    S: 8d9216b8972b7eda65daa6115927c877946b13a1 192.168.0.112:6389
       slots: (0 slots) slave
       replicates 80ac7bf79b0abec10b4183a3a11086452dc1c93f
    M: 4d93a26da64ddfcf6568ea1225138ef435d24b62 192.168.0.112:6380
       slots:[5461-10922] (5462 slots) master
       1 additional replica(s)
    M: c08c86afe29d6df8867d5c1ac73b1f723e9eb88f 192.168.0.112:6381
       slots:[10923-16383] (5461 slots) master
       1 additional replica(s)
    S: 072f85e9e43b64a57daa0b33588fe3d267927b17 192.168.0.112:6390
       slots: (0 slots) slave
       replicates 4d93a26da64ddfcf6568ea1225138ef435d24b62
    S: 753b8090296d9fd0b3f12089fb6590f35df582f0 192.168.0.112:6391
       slots: (0 slots) slave
       replicates c08c86afe29d6df8867d5c1ac73b1f723e9eb88f
    [OK] All nodes agree about slots configuration.
    >>> Check for open slots...
    >>> Check slots coverage...
    [OK] All 16384 slots covered.

## 第四步：连接集群测试 ##

连接集群的命令：  
可以通过任何一个节点连接到集群

./redis-cli -c -p 6379

查看集群信息命令：

CLUSTER NODES

![在这里插入图片描述][20210612165000259.png]  
这样，我们的Redis伪集群就算搭建完成了

补充：我的redis版本：6.2.3

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JyYXZlX2hlYXJ0NHB6ag_size_16_color_FFFFFF_t_70]: /images/20221005/6ec7557696b4478395e0738754934f83.png
[20210612163009561.png]: /images/20221005/97c9059680694e78b06853d3926a5e3b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JyYXZlX2hlYXJ0NHB6ag_size_16_color_FFFFFF_t_70 1]: /images/20221005/6ae0542eea944f6980904876670d3df4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JyYXZlX2hlYXJ0NHB6ag_size_16_color_FFFFFF_t_70 2]: /images/20221005/4d15a2f8e7464ed5b48f6a0dc1e907f0.png
[20210612165000259.png]: /images/20221005/901fc2a5f3fa4ca0a8f5c3c582a53c60.png