Redis集群cluster环境搭建
注意：5.0版本后集群搭建有所改变，不在使用ruby语言创建集群，所以可以跨过ruby的相关插件安装
描述：本章节主要单服务器搭建集群，在一个服务器上启动多个不同端口的redis服务，非真实环境。
真实环境下redis集群会搭建在多个物理服务器上，并非单一的服务器，但搭建方式一样。
1.redis安装
安装教程：https://www.cnblogs.com/zwcry/p/9505949.html
2.安装Redis依赖（ruby）
1）安装依赖包
yum install -y gcc-c++ patch readline readline-devel zlib zlib-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison sqlite-devel iconv-devel
2）安装 rvm
curl -L get.rvm.io | bash -s stable
错误：
他让你尝试 gpg2 --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
执行：
gpg2 --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
或
gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
3）再次安装rvm
curl -L get.rvm.io | bash -s stable
安装成功，提示请把用户添加到rvm用户组
usermod -G rvm root
4）添加生效指令
echo "source /etc/profile.d/rvm.sh" >> ~/.bashrc && source /etc/profile.d/rvm.sh
5）安装ruby
rvm install ruby
6)安装ruby与redis接口
gem install redis
yum install -y rubygems
3.配置六个redis服务（官方建议3主3从）
1）创建集群目录
mkdir /usr/local/redis-cluster/
cd /usr/local/redis-cluster/
mkdir 7001
mkdir 7002
mkdir 7003
mkdir 7004
mkdir 7005
mkdir 7006
2）创建集群第一个redis.conf
cd /usr/local/redis-cluster/
cp /usr/local/redis/redis.conf 7001
vim ./7001/redis.conf
#找到如下KEY，放开注释，修改值内容
bind 0.0.0.0#不限制访问ip和远程连接
protected-mode no#保护模式
port 7001 #修改端口号
daemonize yes#后台运行线程
pidfile /var/run/redis_7001.pid #守护进程文件
dbfilename dump7001.rdb#缓存持久存储文件名称
dir /usr/local/redis-cluster/7001/#db文件存放路径
appendonly yes#开启日志实时持久
appendfilename "appendonly7001.aof"#日志名称
cluster-enabled yes#开启集群
cluster-config-file nodes_7001.conf#集群节点文件
cluster-node-timeout 15000#集群通信超过该时长视为挂掉，单位毫秒
3）拷贝7001/redis.conf到7002~7006
cd /usr/local/redis-cluster/
cp ./7001/redis.conf ./7002/
cp ./7001/redis.conf ./7003/
cp ./7001/redis.conf ./7004/
cp ./7001/redis.conf ./7005/
cp ./7001/redis.conf ./7006/
4）修改7002~7006/redis.conf
#将7002~7006/redis.conf里的7001信息替换为7002~7006的正确信息
cd /usr/local/redis-cluster/
vim ./7002/redis.conf
:%s/7001/7002/g#所有7001的字符串替换为7002
vim ./7003/redis.conf
:%s/7001/7003/g#所有7001的字符串替换为7003
vim ./7004/redis.conf
:%s/7001/7004/g#所有7001的字符串替换为7004
vim ./7005/redis.conf
:%s/7001/7005/g#所有7001的字符串替换为7005
vim ./7006/redis.conf
:%s/7001/7006/g#所有7001的字符串替换为7006
5）启动6个服务
cd /usr/local/redis-cluster/
/usr/local/redis/src/redis-server ./7001/redis.conf
/usr/local/redis/src/redis-server ./7001/redis.conf
/usr/local/redis/src/redis-server ./7002/redis.conf
/usr/local/redis/src/redis-server ./7003/redis.conf
/usr/local/redis/src/redis-server ./7004/redis.conf
/usr/local/redis/src/redis-server ./7005/redis.conf
/usr/local/redis/src/redis-server ./7006/redis.conf
ps -ef|grep redis
4.创建与测试
1）创建集群
/usr/local/redis/src/redis-trib.rb create --replicas 1 192.168.159.129:7001 192.168.159.129:7002 192.168.159.129:7003 192.168.159.129:7004 192.168.159.129:7005 192.168.159.129:7006
注意：5.0版本后集群搭建有所改变，不在使用ruby语言创建集群，所以不再使用redis-trib.rb
请用redis-cli --cluster create 192.168.159.129:7001 192.168.159.129:7002 192.168.159.129:7003 192.168.159.129:7004 192.168.159.129:7005 192.168.159.129:7006 --cluster-replicas 1
如果出现
/usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- redis (LoadError)
from /usr/local/rvm/rubies/ruby-2.3.4/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/redis/src/redis-trib.rb:25:in `<main>'
1.确保redis安装编译成功，否则重装
2.gem install redis
然后再执行 /usr/local/redis/src/redis-trib.rb create --replicas 1 192.168.159.129:7001 192.168.159.129:7002 192.168.159.129:7003 192.168.159.129:7004 192.168.159.129:7005 192.168.159.129:7006
成功如图：
2）测试
/usr/local/redis/src/redis-cli -c -p 7001 --raw#-c表示连集群 --raw中文显示
set name '丁洁'
get name
5.开机启动
mkdir /usr/local/redis-cluster/script
cd /usr/local/redis-cluster/script/
1）编写 start.sh
vim start.sh
#!/bin/sh
/usr/local/redis/src/redis-server /usr/local/redis-cluster/7001/redis.conf
/usr/local/redis/src/redis-server /usr/local/redis-cluster/7002/redis.conf
/usr/local/redis/src/redis-server /usr/local/redis-cluster/7003/redis.conf
/usr/local/redis/src/redis-server /usr/local/redis-cluster/7004/redis.conf
/usr/local/redis/src/redis-server /usr/local/redis-cluster/7005/redis.conf
/usr/local/redis/src/redis-server /usr/local/redis-cluster/7006/redis.conf
2）编写 stop.sh
vim stop.sh
#!/bin/sh
/usr/local/redis/src/redis-cli -c -p 7001 shutdown
/usr/local/redis/src/redis-cli -c -p 7002 shutdown
/usr/local/redis/src/redis-cli -c -p 7003 shutdown
/usr/local/redis/src/redis-cli -c -p 7004 shutdown
/usr/local/redis/src/redis-cli -c -p 7005 shutdown
/usr/local/redis/src/redis-cli -c -p 7006 shutdown
3）编写 restart.sh
vim restart.sh
#!/bin/sh
systemctl stop redis-cluster
systemctl start redis-cluster
4）改变权限
chmod 777 ./*
5）编写自启服务
cd /usr/lib/systemd/system/
vim redis-cluster.service
添加内容如下
[Unit]
Description=redis-cluster
After=network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
ExecStart=/usr/local/redis-cluster/script/start.sh
ExecStop=/usr/local/redis-cluster/script/stop.sh
ExecReload=/usr/local/redis-cluster/script/restart.sh
[Install]
WantedBy=multi-user.target
改变权限
chmod 777 redis-cluster.service
进程服务重加载
systemctl daemon-reload
开机启动集群
systemctl enable redis-cluster.service
启动集群
systemctl start redis-cluster.service
关闭集群
systemctl stop redis-cluster.service
重启集群
systemctl restart redis-cluster.service