[Linux/Redis]搭建Redis集群

1 基本信息

• 3台服务器(CentOS7.3)

192.168.1.101 node101
192.168.1.102 node102
192.168.1.103 node103

2 单机 安装 Redis

• 安装依赖

配置yum源，详见: [Linux]CentOS7搭建/配置：YUM仓库/源[本地源/Web源(Apache HTTP(D))/自建源仓库] - 博客园

yum -y install gcc gcc-c++ net-tools tcl

• 下载 Redis安装包

下载redis安装包到/opt/目录下 + 安装到/usr/local/下

cd /opt
wget http://download.redis.io/releases/redis-5.0.5.tar.gz

cp /opt/redis-5.0.5.tar.gz /usr/local
tar -zxvf /usr/local/redis-5.0.5.tar.gz -C /usr/local/ #解压后的存放目录: /usr/local/redis-5.0.5/
      -C ： 指定解压后存放的路径

• 编译&安装

[编译]
cd /usr/local/redis-5.0.5/deps
make hiredis jemalloc linenoise lua geohash-int

cd /usr/local/redis-5.0.5
make && make install
      注: make              #等待编译完成即可，未报错即进行下一步
      注: make install      #安装，执行make install的时候会将src下面的几个命令复制到/usr/local/bin/下  

[安装]
cd /usr/local/redis-5.0.5/utils
./install_server.sh

• 初步配置

redis_port=6379
	设置临时变量，以便后续调用其值
cp /usr/local/redis-5.0.5/redis.conf /etc/redis/redis_port.conf
sed -i "s/127.0.0.1/0.0.0.0/g" /etc/redis/$redis_port.conf
	注： sed 's/要被取代的字串/新的字串/g' ； bind 0.0.0.0 : 允许与任何主机通信
vi /etc/redis/redis_port.conf
	bind 192.168.0.101/102/103 # 本机ip
	daemonize yes # 后台运行
	cluster-enabled yes # 启用集群

service redis_$redis_port restart

安装压缩包存放路径: /opt/redis-5.0.5.tar.gz
安装路径        : /usr/local/redis-5.0.5/*

Config file    : /etc/redis/6379.conf
Log file       : /var/log/redis_6379.log
Data dir       : /var/lib/redis/6379
Executable     : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli
Copied /tmp/6379.conf => /etc/init.d/redis_6379

• 运行redis

因为redis-server命令在/usr/local/bin目录里面，而该目录又配置在PATH中，所以可以像执行ls、mkdir等命令的方式去执行redis-cli或者redis-server等命令。

redis-server                        # 在任意目录下运行 (方式1)

/usr/local/redis-5.0.5/src/redis-server   # 在redis目录下运行 (方式2) 

redis-server /etc/redis/6379.conf  # 指定redis.conf文件启动 (方式3)

service redis_6379 restart

2 配置Redis集群

3台机器均需如下操作

• 配置防火墙

systemctl start firewalld
firewall-cmd --permanent --zone=public --add-port=6379/tcp
	ss -lntp
		"master"
	关闭端口
		firewall-cmd --permanent --zone=public --remove-port=6379/tcp
firewall-cmd --permanent --zone=public --add-port=16379/tcp
	Redis集群通信时用
systemctl restart firewalld

• 安装集群相关依赖

yum -y install ruby rubygems
gem install redis
      安装Redis客户端 for ruby

[若执行"gem install redis"出现如下信息时，可通过如下4步来尝试解决]

ERROR: Could not find a valid gem 'redis' (>= 0), here is why:Unable to download data from https://rubygems.org/ - no such name (https://rubygems.org/latest_specs.4.8.gz)

1 下载、上传到/opt/dataeye/redis/redis-3.3.0.gem (下载地址： http://rubygems.org/downloads/redis-3.3.0.gem)

2 cd  /opt/dataeye/redis/
3 yum -y install zlib-devel
	gem的依赖
4 gem install redis-3.3.0.gem

• 创建集群

[推荐]
redis-cli --cluster create 192.168.1.101:6379 192.168.1.102:6379 192.168.1.103:6379

[不被推荐/已废弃]X
cd /usr/local/redis-5.0.5/src/
./redis-trib.rb create 192.168.1.101:6379 192.168.1.102:6379 192.168.1.103:6379

3 验证集群可用性

3.1 查看集群节点信息及状态

cluster info
cluster nodes

3.2 数据同步一致性验证

[node102]

[root@node102 src]# redis-cli -h 192.168.1.101 -c
192.168.1.101:6379> set name sdc_test
OK
192.168.1.101:6379> get name
"sdc_test"
192.168.1.101:6379> exit

[node101]

[root@node101 src]# redis-cli -h 192.168.1.102 -c
192.168.1.102:6379> get name
-> Redirected to slot [5798] located at 192.168.1.101:6379
"sdc_test"
192.168.1.101:6379> set name "sdc_test2~~~~~~~~"
-> Redirected to slot [5798] located at 192.168.1.101:6379
OK
192.168.1.101:6379> exit

[node103]

[root@node103 redis]# redis-cli -h 192.168.1.102 -c
192.168.1.102:6379> get name
-> Redirected to slot [5798] located at 192.168.1.101:6379
"sdc_test2~~~~~~~~"
192.168.1.102:6379> exit

4 参考文献

• CentOS7简单几步实现Redis集群 - 简书
• redis-5.0.5.tar.gz 安装 - 博客园