Summary of Redis cluster building tutorial

The content of this article is a summary of the Redis cluster building tutorial. The content is very detailed. Friends in need can refer to it. I hope it can help everyone.

Preface

This article collects and organizes web articles, websites, and my own experience in building Redis clusters. The level is limited and only the environment construction is shared. This article is divided into the following parts:

• Redis installation

• Rvm installation and replacement source

• Rvm Ruby installation, use, uninstall

• RubyGems upgrade, change source, install redis

• Cluster configuration

• Achievements Test

Please follow the above steps to view this article

Instructions:

• For learning purposes only , I do not assume any responsibility if used online.

• If you have any questions, please leave a message below.

• Some commands in the article do not include sudo because I use root permissions.

Redis installation

Compile and install

wget http://download.redis.io/releases/redis-4.0.10.tar.gz
tar xzf redis-4.0.10.tar.gz
cd redis-4.0.10
make PREFIX=/usr/local/redis install

Note: If you do not want to use Redis as a service, you have already installed it here

Make Redis a service reference: Redis Quick Start

• Create a directory where to store your Redis config files and your data: (Youdao Dictionary: Create A directory to store Redis configuration files and data :)

  

  # 这只是一个目录结构，大家不要着急为什么自己没有，往下看，一步一步来
  [root@amor ~]# cd /usr/local/redis
  [root@amor redis]# tree
  .
  ├── bin  # 编译安装指定目录后自动生成目录及文件
  │   ├── redis-benchmark
  │   ├── redis-check-aof
  │   ├── redis-check-rdb
  │   ├── redis-cli
  │   ├── redis-sentinel -> redis-server
  │   └── redis-server
  ├── conf # 自己建立的存储配置文件的目录及自己创建的单个Redis配置文件
  │   └── 6379.conf
  └── data # 自己建立的存储Redis数据的目录及单个Redis服务数据存储目录
      └── 6379
  
  4 directories, 7 files

  Note: cp /usr /src/redis-4.0.10/src/redis-trib.rb /usr/local/redis/bin/ You will need to use

• Copy later when creating a cluster the init script that you'll find in the Redis distribution under the utils directory into /etc/init.d. We suggest calling it with the name of the port where you are running this instance of Redis. For example: (Youdao Dictionary : Copy the init script found in the Redis distribution under the utils directory into /etc/init.d We recommend calling it with the name of the port on which this Redis instance is running. For example:)

  sudo cp utils/redis_init_script /etc/init.d/redis_6379

• Edit the init script.（Youdao Dictionary: Edit the init script.）

  #!/bin/sh
  # chkconfig 2345 90 25                         # linux 开机启动设置 2345 运行级别 90 启动优先级（参考 memcached head /etc/rc.d/rc3.d/S90memcached ) 25 关闭优先级 （参考memcached）
  # Simple Redis init.d script conceived to work on Linux systems
  # as it does use of the /proc filesystem.
  
  ### BEGIN INIT INFO
  # Provides:     redis_6379
  # Default-Start:        2 3 4 5
  # Default-Stop:         0 1 6
  # Short-Description:    Redis data structure server
  # Description:          Redis data structure server. See https://redis.io
  ### END INIT INFO
  
  REDISPORT=6379
  EXEC=/usr/local/redis/bin/redis-server         # 修改为自己的可执行文件所在目录
  CLIEXEC=/usr/local/redis/bin/redis-cli         # 修改为自己的可执行文件所在目录
  
  PIDFILE=/var/run/redis_${REDISPORT}.pid        # 默认就好
  CONF="/usr/local/redis/conf/${REDISPORT}.conf" # 修改为自己的配置文件存放目录
  ···省略···
  esac

  Start modifying redis.conf

  Make sure to modify REDISPORT accordingly to the port you are using. Both the pid file path and the configuration file name depend on the port number. The file names all depend on the port number.)

• Set daemonize to yes (by default it is set to no). (Needs to be changed to yes)

• Set the pidfile to /var/run/redis_6379.pid (modify the port if needed). (default is sufficient)

• Change the port accordingly. In our example it is not needed as the default port is already 6379. (The default is enough, you need to copy the configuration file and reset the port when setting up the cluster)

• Set your preferred loglevel. (default is enough)

• Set the logfile to / var/log/redis_6379.log (the default seems to be empty and needs to be modified)

• Set the dir to /var/redis/6379 (very important step!) (Redis data storage directory, you need to modify the location custom path)

• sudo cp redis.conf /usr/local/redis/conf/6379.conf (Modify into a self-defined directory. Refer to the above directory structure redis.conf in the src directory in your redis decompression directory)

• sudo mkdir /usr/local/redis/data/6379 (modify into your own defined directory. Refer to the above directory structure)

• Edit the configuration file, making sure to perform the following changes: (Youdao Dictionary: Edit the configuration file, make sure to perform the following changes: )

  注：上面的意思是让你们修改 /usr/local/redis/conf/6379.conf，用vim 打开，搜索上述关键词即可，参考以下设置（如果所有的步骤都是粘贴复制的走下来的，直接修改成下面这样:0.0）：

  port 6379
  daemonize yes
  pidfile /var/run/redis_6379.pid
  loglevel notice
  logfile "/var/log/redis_6379.log"
  dir /usr/local/redis/data/6379

• Finally add the new Redis init script to all the default runlevels using the following command: (Youdao Dictionary: Finally, use the following command to add the new Redis init script to Added to all default runlevels :)

  # ubuntu
  sudo update-rc.d redis_6379 defaults

  # centos
  chkconfig --add redis_6379

• You are done! Now you can try running your instance with:

  sudo /etc/init.d/redis_6379 start

test

Redis stop and start

yum installation

• /etc/init.d /redis-server stop

• /etc/init.d/redis-server start

• /etc/init.d/redis-server restart

Three ways to install source code

sudo /etc/init.d/redis_6379 start
/usr/local/redis/bin/redis-server redis.conf  # 注意此处缺省：配置文件路径
redis-cli -h 127.0.0.1 -p 6379 shutdown

Note: If you just stop local redis, please execute: redis-cli shutdown

Forced termination

• kill -9 process number

• pkill redis

Rvm 安装 更换源

curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
curl -L get.rvm.io | bash -s stable 
rvm user gemsets # 建立用户配置目录，更换源的时候需要向 db 文件写入配置信息
echo "ruby_url=https://cache.ruby-china.org/pub/ruby" > ~/.rvm/user/db # 更换源

Rvm Ruby 安装、使用、卸载

rvm list known
rvm install 2.6
rvm use 2.6
yum -y remove ruby # 卸载centos yum 安装的 1.8 版本
ruby --version
rvm uninstall ruby # 此处带不带版本自己测试

RubyGems 升级、更换源、安装redis

gem install rubygems-update 
rubygems-update
gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
gem sources -l 
gem install redis

集群配置

注：下面的内容是我自己参考这篇博文加上我熟悉Redis安装后自己的配置过程。大家可以参考NrwLm - Redis 集群搭建详细指南。

开启 Redis cluster

cd /usr/local/redis/conf
cp 6379.conf redis.conf.default  # 用作集群其他配置文件的蓝本
sudo vim redis.conf.default

修改内容如下

bind 192.168.2.123  # 绑定当前机器 IP
cluster-enabled yes # 取消注释，启动集群模式
cluster-config-file nodes-6379.conf # 取消注释,修改为 /usr/local/redis/data/6379/nodes-6379.conf  (如果遇到需要重新建立集群，不将此项修改为指定路径而和启动配置文件放在一起，会导致建立集群时，删除重建conf 文件)
cluster-node-timeout 15000 # 取消注释
appendonly yes # 将 no 修改为 yes

创建配置文件

cd /usr/local/redis/conf
echo 9001.conf 9002.conf 9003.conf 9004.conf 9005.conf 9006.conf | xargs -n 1 cp -v redis.conf.default
sed -i 's/6379/9001/g'  9001.conf 
sed -i 's/6379/9002/g'  9002.conf 
sed -i 's/6379/9003/g'  9003.conf 
sed -i 's/6379/9004/g'  9004.conf 
sed -i 's/6379/9005/g'  9005.conf 
sed -i 's/6379/9006/g'  9006.conf

创建数据存储文件

cd /usr/local/redis/data
mkdir -p 9001 9002 9003 9004 9005 9006
# 后期可能需要删除该文件件下的文件，用于重建集群，所以，删除命令也写一下
rm -rf 900*/*

启动Redis cluster 节点

/usr/local/redis/bin/redis-server /usr/local/redis/conf/9001.conf
/usr/local/redis/bin/redis-server /usr/local/redis/conf/9002.conf
/usr/local/redis/bin/redis-server /usr/local/redis/conf/9003.conf 
/usr/local/redis/bin/redis-server /usr/local/redis/conf/9004.conf
/usr/local/redis/bin/redis-server /usr/local/redis/conf/9005.conf
/usr/local/redis/bin/redis-server /usr/local/redis/conf/9006.conf

创建集群

/usr/local/redis/bin/redis-trib.rb create --replicas 1 192.168.2.123:9001 192.168.2.123:9002 192.168.2.123:9003 192.168.2.123:9004 192.168.2.123:9005 192.168.2.123:9006

测试

执行命令: /usr/local/redis/bin/redis-cli -c -h 192.168.2.123 -p 9001

<img src="https://img.php.cn//upload/image/755/105/520/1532744572918545.png" title="1532744572918545.png" alt="Summary of Redis cluster building tutorial">

问题汇总

• 如果遇到timeout 请查看自己的防火墙，安装宝塔的尤其注意，请先去安全里面放行 9001:9006 的端口

• redis集群 Waiting for the cluster to join 一直等待,redis集群不仅需要开通redis客户端连接的端口，而且需要开通集群总线端口,集群总线端口为redis客户端连接的端口 + 1000
  

• redis /usr/bin/env: ruby: 没有那个文件或目录

• 执行这个命令 rvm get stable --auto-dotfiles，或者执行 nvm list 有详细的错误说明（查了资料说，线上不要用rvm安装ruby）



• 这是我自己的解决方案

  # 把这个添加到 /etc/profile 文件中（放到最后就行）
  rvm use ruby-2.6.0-preview2

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