Redis的Cluster集群搭建(CentOS7环境，Redis6.0.9)

妖狐艹你老母 2022-12-27 01:22 195阅读 0赞

**目录**

一、介绍

二、部署Redis的Cluster集群

1、编译完成Redis文件

2、新建准备好6个文件夹

3、拷贝redis执行文件和conf

4、修改redis.conf文件

5、创建启动文件start\_all.sh

6、创建停止文件stop\_all.sh

7、启动节点

8、创建集群

三、验证集群正常工作

参考文献：

--------------------

# 一、介绍 #

在单机版的Redis中，每个Master之间是没有任何通信的，所以我们一般在Jedis客户端或者Codis这样的代理中做Pre-sharding。按照CAP理论来说，单机版的Redis属于保证CP(Consistency & Partition-Tolerancy)而牺牲A(Availability)，也就说Redis能够保证所有用户看到相同的数据（一致性，因为Redis不自动冗余数据）和网络通信出问题时，暂时隔离开的子系统能继续运行（分区容忍性，因为Master之间没有直接关系，不需要通信），但是不保证某些结点故障时，所有请求都能被响应（可用性，某个Master结点挂了的话，那么它上面分片的数据就无法访问了）。有了Cluster功能后，Redis从一个单纯的NoSQL内存数据库变成了分布式NoSQL数据库，CAP模型也从CP变成了AP。也就是说，通过自动分片和冗余数据，Redis具有了真正的分布式能力，某个结点挂了的话，因为数据在其他结点上有备份，所以其他结点顶上来就可以继续提供服务，保证了Availability。然而，也正因为这一点，Redis无法保证曾经的强一致性了。这也是CAP理论要求的，三者只能取其二。

# 二、部署Redis的Cluster集群 #

## 1、编译完成Redis文件 ##

详见上一篇博客文章

## 2、新建准备好6个文件夹 ##

> \[root@10 opt\]\# mkdir redis  
> \[root@10 opt\]\# cd redis  
> \[root@10 redis\]\# mkdir redis0  
> \[root@10 redis\]\# mkdir redis1  
> \[root@10 redis\]\# mkdir redis2  
> \[root@10 redis\]\# mkdir redis3  
> \[root@10 redis\]\# mkdir redis4  
> \[root@10 redis\]\# mkdir redis5

## 3、拷贝redis执行文件和conf ##

> \[root@10 redis0\]\# cp ../../redis-6.0.9/bin/\* .
> 
> \[root@10 redis0\]\# cp ../../redis-6.0.9/etc/\* .
> 
> \[root@10 redis0\]\# cd ../redis1  
> \[root@10 redis1\]\# cp ../redis0/\* 
> 
> \[root@10 redis1\]\# cd ../redis2  
> \[root@10 redis2\]\# cp ../redis0/\* .  
> \[root@10 redis2\]\# cd ../redis3  
> \[root@10 redis3\]\# cp ../redis0/\* .  
> \[root@10 redis3\]\# cd ../redis4  
> \[root@10 redis4\]\# cp ../redis0/\* .  
> \[root@10 redis4\]\# cd ../redis5  
> \[root@10 redis5\]\# cp ../redis0/\* .  
> \[root@10 redis5\]\# ls  
> dump.rdb         redis-benchmark  redis-check-rdb  redis.conf      redis-server  
> mkreleasehdr.sh  redis-check-aof  redis-cli        redis-sentinel  redis-trib.rb

## 4、修改redis.conf文件 ##

修改以下四项内容（红色部分）

\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# NETWORK \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#

\# By default, if no "bind" configuration directive is specified, Redis listens  
\# for connections from all available network interfaces on the host machine.  
\# It is possible to listen to just one or multiple selected interfaces using  
\# the "bind" configuration directive, followed by one or more IP addresses.  
\#  
\# Examples:  
\#  
\# bind 192.168.1.100 10.0.0.1  
\# bind 127.0.0.1 ::1  
\#  
\# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the  
\# internet, binding to all the interfaces is dangerous and will expose the  
\# instance to everybody on the internet. So by default we uncomment the  
\# following bind directive, that will force Redis to listen only on the  
\# IPv4 loopback interface address (this means Redis will only be able to  
\# accept client connections from the same host that it is running on).  
\#  
\# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES  
\# JUST COMMENT OUT THE FOLLOWING LINE.  
\# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
bind 127.0.0.1  
bind 192.168.56.101

\# Accept connections on the specified port, default is 6379 (IANA \#815344).  
\# If port 0 is specified Redis will not listen on a TCP socket.  
port 6379

\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# GENERAL \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#

\# By default Redis does not run as a daemon. Use 'yes' if you need it.  
\# Note that Redis will write a pid file in /var/run/redis.pid when daemonized.  
daemonize yes

\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# REDIS CLUSTER  \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#

\# Normal Redis instances can't be part of a Redis Cluster; only nodes that are  
\# started as cluster nodes can. In order to start a Redis instance as a  
\# cluster node enable the cluster support uncommenting the following:  
\#  
cluster-enabled yes

注意：同一个IP中6个文件夹里的port端口号要不一样，这里是6379-6484，在实际使用中不同IP的端口号可以设置一样。

## 5、创建启动文件start\_all.sh ##

为了方便管理，启动文件和终止文件都放在redis文件夹下，还有拷贝出来一份redis-cli文件

cd redis0
    ./redis-server redis.conf
    cd ..
    cd redis1
    ./redis-server redis.conf
    cd ..
    cd redis2
    ./redis-server redis.conf
    cd ..
    cd redis3
    ./redis-server redis.conf
    cd ..
    cd redis4
    ./redis-server redis.conf
    cd ..
    cd redis5
    ./redis-server redis.conf
    cd ..

##  6、创建停止文件stop\_all.sh ##

./redis1/redis-cli -p 6379 shutdown
    ./redis1/redis-cli -p 6380 shutdown
    ./redis1/redis-cli -p 6381 shutdown
    ./redis1/redis-cli -p 6382 shutdown
    ./redis1/redis-cli -p 6383 shutdown
    ./redis1/redis-cli -p 6384 shutdown

## 7、启动节点 ##

./start\_all.sh执行启动文件，执行起来后可以通过ps查看启动情况

> \[root@10 redis\]\# ./start\_all.sh  
> \[root@10 redis\]\# ps -ef | grep redis  
> root     14959     1  0 08:18 ?        00:00:07 ./redis-server 192.168.56.101:6379 \[cluster\]  
> root     14965     1  0 08:18 ?        00:00:07 ./redis-server 192.168.56.101:6380 \[cluster\]  
> root     14971     1  0 08:18 ?        00:00:07 ./redis-server 192.168.56.101:6381 \[cluster\]  
> root     14977     1  0 08:18 ?        00:00:07 ./redis-server 192.168.56.101:6382 \[cluster\]  
> root     14983     1  0 08:18 ?        00:00:07 ./redis-server 192.168.56.101:6383 \[cluster\]  
> root     14989     1  0 08:18 ?        00:00:07 ./redis-server 192.168.56.101:6384 \[cluster\]  
> root     18204 10810  0 09:18 pts/1    00:00:00 grep --color=auto redis

## 8、创建集群 ##

执行./redis-cli --cluster create 192.168.56.101:6379 192.168.56.101:6380 192.168.56.101:6381 192.168.56.101:6382 192.168.56.101:6383 192.168.56.101:6384 --cluster-replicas 1命令创建集群

> \[root@10 redis\]\# ./redis-cli --cluster create 192.168.56.101:6379 192.168.56.101:6380 192.168.56.101:6381 192.168.56.101:6382 192.168.56.101:6383 192.168.56.101:6384 --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 192.168.56.101:6383 to 192.168.56.101:6379  
> Adding replica 192.168.56.101:6384 to 192.168.56.101:6380  
> Adding replica 192.168.56.101:6382 to 192.168.56.101:6381  
> >>> Trying to optimize slaves allocation for anti-affinity  
> \[WARNING\] Some slaves are in the same host as their master  
> M: 522f0dca780073ab668bc80ded5a1489e2febe3e 192.168.56.101:6379  
>    slots:\[0-5460\] (5461 slots) master  
> M: f65edec341cdc39ded3ecd5298c92f3192c8afcd 192.168.56.101:6380  
>    slots:\[5461-10922\] (5462 slots) master  
> M: 1b55615b201a68db64db210381d9a4dbaaf6b17f 192.168.56.101:6381  
>    slots:\[10923-16383\] (5461 slots) master  
> S: 3f9ff65caf28e79864f14f1996e8b5ecd136959a 192.168.56.101:6382  
>    replicates f65edec341cdc39ded3ecd5298c92f3192c8afcd  
> S: 5a595b9da405a27a097f9756008b47414e2da1f7 192.168.56.101:6383  
>    replicates 1b55615b201a68db64db210381d9a4dbaaf6b17f  
> S: 204bc647266c4c369ebe45d4ba0755c28543494e 192.168.56.101:6384  
>    replicates 522f0dca780073ab668bc80ded5a1489e2febe3e  
> 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 192.168.56.101:6379)  
> M: 522f0dca780073ab668bc80ded5a1489e2febe3e 192.168.56.101:6379  
>    slots:\[0-5460\] (5461 slots) master  
>    1 additional replica(s)  
> M: f65edec341cdc39ded3ecd5298c92f3192c8afcd 192.168.56.101:6380  
>    slots:\[5461-10922\] (5462 slots) master  
>    1 additional replica(s)  
> M: 1b55615b201a68db64db210381d9a4dbaaf6b17f 192.168.56.101:6381  
>    slots:\[10923-16383\] (5461 slots) master  
>    1 additional replica(s)  
> S: 204bc647266c4c369ebe45d4ba0755c28543494e 192.168.56.101:6384  
>    slots: (0 slots) slave  
>    replicates 522f0dca780073ab668bc80ded5a1489e2febe3e  
> S: 3f9ff65caf28e79864f14f1996e8b5ecd136959a 192.168.56.101:6382  
>    slots: (0 slots) slave  
>    replicates f65edec341cdc39ded3ecd5298c92f3192c8afcd  
> S: 5a595b9da405a27a097f9756008b47414e2da1f7 192.168.56.101:6383  
>    slots: (0 slots) slave  
>    replicates 1b55615b201a68db64db210381d9a4dbaaf6b17f  
> \[OK\] All nodes agree about slots configuration.  
> >>> Check for open slots...  
> >>> Check slots coverage...  
> \[OK\] All 16384 slots covered.

注意1：网络上很多都是使用redis-trib.rb创建集群，但是在redis5.0之后取消了ruby脚本 redis-trib.rb的支持（手动命令行添加集群的方式不变），创建集合到redis-cli里，避免了再安装ruby的相关环境。直接使用redis-clit的参数--cluster 来取代。错误信息参考如下：

> \[root@10 redis\]\# ./redis-trib.rb create --replicas 1 192.168.56.101:6379 192.168.56.101:6380 192.168.56.101:6381 192.92.168.56.101:6383 192.168.56.101:6384  
> WARNING: redis-trib.rb is not longer available!  
> You should use redis-cli instead.
> 
> All commands and features belonging to redis-trib.rb have been moved  
> to redis-cli.  
> In order to use them you should call redis-cli with the --cluster  
> option followed by the subcommand name, arguments and options.
> 
> Use the following syntax:  
> redis-cli --cluster SUBCOMMAND \[ARGUMENTS\] \[OPTIONS\]
> 
> Example:  
> redis-cli --cluster create 192.168.56.101:6379 192.168.56.101:6380 192.168.56.101:6381 192.168.56.101:6382 192.168.56.56.101:6384 --cluster-replicas 1
> 
> To get help about all subcommands, type:  
> redis-cli --cluster help

注意2：创建集群时候提示连接报错如下

> \[root@10 redis\]\# redis-cli --cluster create 192.168.56.101:6379 192.168.56.101:6380 192.168.56.101:6381 192.168.56.10.101:6383 192.168.56.101:6384 --cluster-replicas 1  
> Could not connect to Redis at 192.168.56.101:6379: Connection refused

解决方式：查看步骤4中Redis.conf文件的bind是否有绑定IP，这里是192.168.56.101

注意3：复制的执行文件在创建集群时候报错，错误信息如下：

> \[root@10 redis\]\# ./redis-cli --cluster create 192.168.56.101:6379 192.168.56.101:6380 192.168.56.101:6381 192.168.56.10.101:6383 192.168.56.101:6384 --cluster-replicas 1  
> \[ERR\] Node 192.168.56.101:6379 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.

解决方法：删除每个节点中的appendonly.aof、dump.rdb、node\_xxx.conf文件，redis-cli -c -h -p登录每个redis节点，执行以下命令，再创建集群就可以了

> \[root@10 redis\]\# ./redis0/redis-cli -c -h 192.168.56.101 -p 6379  
> 192.168.56.101:6379> flushdb  
> OK  
> 192.168.56.101:6379> cluster reset  
> OK  
> 192.168.56.101:6379> exit

# 三、验证集群正常工作 #

> \[root@10 redis\]\# ./redis1/redis-cli -c -h 192.168.56.101 -p 6379  
> 192.168.56.101:6379> cluster nodes  
> f65edec341cdc39ded3ecd5298c92f3192c8afcd 192.168.56.101:6380@16380 master - 0 1607262213000 2 connected 5461-10922  
> 1b55615b201a68db64db210381d9a4dbaaf6b17f 192.168.56.101:6381@16381 master - 0 1607262213000 3 connected 10923-16383  
> 204bc647266c4c369ebe45d4ba0755c28543494e 192.168.56.101:6384@16384 slave 522f0dca780073ab668bc80ded5a1489e2febe3e 0 1nnected  
> 3f9ff65caf28e79864f14f1996e8b5ecd136959a 192.168.56.101:6382@16382 slave f65edec341cdc39ded3ecd5298c92f3192c8afcd 0 1nnected  
> 5a595b9da405a27a097f9756008b47414e2da1f7 192.168.56.101:6383@16383 slave 1b55615b201a68db64db210381d9a4dbaaf6b17f 0 1nnected  
> 522f0dca780073ab668bc80ded5a1489e2febe3e 192.168.56.101:6379@16379 myself,master - 0 1607262213000 1 connected 0-5460  
> 192.168.56.101:6379> cluster info  
> cluster\_state:ok  
> cluster\_slots\_assigned:16384  
> cluster\_slots\_ok:16384  
> cluster\_slots\_pfail:0  
> cluster\_slots\_fail:0  
> cluster\_known\_nodes:6  
> cluster\_size:3  
> cluster\_current\_epoch:6  
> cluster\_my\_epoch:1  
> cluster\_stats\_messages\_ping\_sent:1493  
> cluster\_stats\_messages\_pong\_sent:1464  
> cluster\_stats\_messages\_sent:2957  
> cluster\_stats\_messages\_ping\_received:1459  
> cluster\_stats\_messages\_pong\_received:1493  
> cluster\_stats\_messages\_meet\_received:5  
> cluster\_stats\_messages\_received:2957  
>

# 参考文献： #

1、[https://blog.csdn.net/truelove12358/article/details/79612954][https_blog.csdn.net_truelove12358_article_details_79612954]

2、[https://www.cnblogs.com/zhoujinyi/p/11606935.html][https_www.cnblogs.com_zhoujinyi_p_11606935.html]

3、[https://blog.csdn.net/miss1181248983/article/details/90056960][https_blog.csdn.net_miss1181248983_article_details_90056960]

[https_blog.csdn.net_truelove12358_article_details_79612954]: https://blog.csdn.net/truelove12358/article/details/79612954
[https_www.cnblogs.com_zhoujinyi_p_11606935.html]: https://www.cnblogs.com/zhoujinyi/p/11606935.html
[https_blog.csdn.net_miss1181248983_article_details_90056960]: https://blog.csdn.net/miss1181248983/article/details/90056960