搭建redis cluster集群过程（详细）

原文博客：Doi技术团队
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搭建redis cluster集群

服务器版本

CentOS Linux release 7.5.1804 (Core)

redis cluster 规模

• 三主三从
• 192.168.24.241:6001,192.168.241.6002
• 192.168.24.242:6001,192.168.242.6002
• 192.168.24.243:6001,192.168.243.6002

下载redis

• wget http://download.redis.io/releases/redis-4.0.8.tar.gz
• 解压
• make
• make install
• 启动redis服务：redis-server

出现的错误

1. zmalloc.h:50:31: 致命错误：jemalloc/jemalloc.h：没有那个文件或目录 这个错误

解决方法：make MALLOC=libc

修改redis.conf配置

1. 创建redis_cluster目录(每台服务器)
   mkdir redis_cluster
2. 在redis_cluster目录里创建两个目录6001 6002
   mkdir 6001
mkdir 6002
3. 修改redis.conf配置

#配置
#redis后台运行
daemonize    yes   
                      
#pidfile文件 6001~6003
pidfile  /var/run/redis_6000.pid   
      
#6001~6003
port  7000          
                     
#开启集群
cluster-enabled  yes   
                  
#配置文件首次启动自动生成
cluster-config-file  nodes_6001.conf 
    
#请求超时
cluster-node-timeout  5000    
           
#aof日志
appendonly  no  

#绑定地址，需要别的机器能ping通的地址
bind 192.168.21.137

4. 将redis.conf 赋值到6001和6002中
   cp redis.conf redis_cluster/6001
cp redis.conf redis_cluster/6002

验证redis安装成功

1. 启动redis
   进去每个目录 cd redis_cluster/6001
   启动redisredis-server redis.conf

2. 查看redis进程
   ps -ef |grep redis
   如果看到redis进程，则代表redis启动成功

安装redis-trib.rb

redis-trib.rb 是官方提供的用于搭建集群的工具

安装ruby

redis-trib.rb是基于ruby写的

• 安装ruby yum -y install ruby ruby-devel rubygems rpm-build
  由于CentOS7 yum库中ruby的版本支持到 2.0.0，但是redis-trib.rb需要>2.2.2版本，因此需要用rvm来更新ruby
• 更新ruby
  • 安装rvm
    • gpg2 --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3
    • curl -L get.rvm.io | bash -s stable
    • find / -name rvm -print
  • 更新配置 source /usr/local/rvm/scripts/rvm
  • 查看rvm库中已知的ruby版本 rvm list known
  • 安装一个ruby版本 rvm install 2.3.3
  • 使用一个ruby版本 rvm install 2.3.3
  • 设置默认版本 rvm use 2.3.3 --default
  • 卸载yum下载的版本 rvm remove 2.0.0

下载redis 接口

• 利用gem下载 gem install redis

确认安装成功

• redis-trib.rb是在redis的src目录下
• /opt/redis/redis-4.0.8/src/redis-trib.rb

创建集群

用redis-trib.rb 创建集群

• redis-trib.rb 使用

  • 参考url

• 利用create指令来创建集群，**--replicas 1 ** 指的是每个主节点都有一个从节点,后面跟着的是redis的 ip:port

• ./redis-trib.rb create --replicas 1 192.168.24.241:6001 192.168.24.241:6002 192.168.24.242:6001 192.168.24.242:6002 192.168.24.243:6001 192.168.24.243:6002

[root@sy1 src]# ./redis-trib.rb create --replicas  1 192.168.24.241:6001 192.168.24.241:6002 192.168.24.242:6001 192.168.24.242:6002 192.168.24.243:6001 192.168.24.243:6002
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.24.241:6001
192.168.24.242:6001
192.168.24.243:6001
Adding replica 192.168.24.242:6002 to 192.168.24.241:6001
Adding replica 192.168.24.243:6002 to 192.168.24.242:6001
Adding replica 192.168.24.241:6002 to 192.168.24.243:6001
M: f829b83670df08aa0289a5ffef9efa32386e92d2 192.168.24.241:6001
   slots:0-5460 (5461 slots) master
S: 184f6dc341d0d49fbf17739233b7078606b399c3 192.168.24.241:6002
   replicates 130f3b8025c422820afa222f27949cf9acdc5f24
M: 63458c1953bdaa3484c482af23b1a1fa7e6f4f71 192.168.24.242:6001
   slots:5461-10922 (5462 slots) master
S: 8c8a6e54ee4c50e296f95faa7cda1cda0328fbe8 192.168.24.242:6002
   replicates f829b83670df08aa0289a5ffef9efa32386e92d2
M: 130f3b8025c422820afa222f27949cf9acdc5f24 192.168.24.243:6001
   slots:10923-16383 (5461 slots) master
S: 3c8b17d350ffafc7bafe1a0189deac5164fa45f1 192.168.24.243:6002
   replicates 63458c1953bdaa3484c482af23b1a1fa7e6f4f71
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 192.168.24.241:6001)
M: f829b83670df08aa0289a5ffef9efa32386e92d2 192.168.24.241:6001
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
M: 130f3b8025c422820afa222f27949cf9acdc5f24 192.168.24.243:6001
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: 184f6dc341d0d49fbf17739233b7078606b399c3 192.168.24.241:6002
   slots: (0 slots) slave
   replicates 130f3b8025c422820afa222f27949cf9acdc5f24
S: 3c8b17d350ffafc7bafe1a0189deac5164fa45f1 192.168.24.243:6002
   slots: (0 slots) slave
   replicates 63458c1953bdaa3484c482af23b1a1fa7e6f4f71
S: 8c8a6e54ee4c50e296f95faa7cda1cda0328fbe8 192.168.24.242:6002
   slots: (0 slots) slave
   replicates f829b83670df08aa0289a5ffef9efa32386e92d2
M: 63458c1953bdaa3484c482af23b1a1fa7e6f4f71 192.168.24.242:6001
   slots:5461-10922 (5462 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.

连接集群

• 命令:redis-cli -h 192.168.24.241 -p 6001 -c
  • -h：Ip
  • -p：端口，默认6379
  • -c：集群模式，访问集群必须带上

[root@sy2 6001]# redis-cli -h 192.168.24.241 -p 6001 -c
192.168.24.241:6001> set key1 key1
-> Redirected to slot [9189] located at 192.168.24.242:6001
OK
192.168.24.242:6001> get key1
"key1"
192.168.24.242:6001> set kk 241
-> Redirected to slot [2589] located at 192.168.24.241:6001
OK
192.168.24.241:6001> set kjkjkj 1231231
OK
192.168.24.241:6001> get kk
"241"