一 redis 安装
1.安装部分依赖库 ：因为redis是使用C++写的 ，所有首先安装各种依赖包：
$ yum install gcc-c++2. 选择要下载的redis版本：必须为redis 3.0版本及以上(3.0 后才支持集群功能)，推荐5.0 版本。本人使用的5.0 版本
$ wget http://download.redis.io/releases/redis-5.0.5.tar.gz
$ tar -zxvf redis-5.0.5.tar.gz
$ mv redis-5.0.5 redis3.编译redis源代码
$ cd redis
$ make
$ cd ./src
$ make install4.安装ruby : 必须为2.5版本及以上才能被redis使用，通过yum安装的话版本不适用于redis,所以此处通过手动安装。
1）下载ruby稳定版
$ wget https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.1.tar.gz
$ tar -xvf ruby-2.5.1.tar.gz
$ cd ruby-2.5.1
$ ./configure --prefix=/usr/local/rvm //此目录为ruby最终安装目录
$ make && make install
//安装后 查看下ruby 版本
$ /usr/local/rvm/bin/ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]2）ruby写入环境变量
$ vi /etc/profile
//在末尾添加 ruby路径与 上步最终安装目录一致 且不要覆盖原有PATH
RUBY_HOME=/usr/local/rvm
export PATH=$PATH:$RUBY_HOME/bin
% source /etc/profile3）安装ruby所需 zlib包
$yum -y install zlib-devel
$cd ruby-2.5.1/ext/zlib
$ruby ./extconf.rb
$make
$make install
// 此步骤若出现 以下编译错误
// make: *** 没有规则可以创建“zlib.o”需要的目标“/include/ruby.h”。 停止。
// 解决方案为 在Makefile顶部中的增加top_srcdir = ../..4）安装 ruby 所需 openssl
yum install openssl-devel -y
$cd ruby-2.5.1/ext/openssl
$ruby ./extconf.rb
$make
$make install
// 此步骤若出现 以下编译错误
// make: *** 没有规则可以创建“zlib.o”需要的目标“/include/ruby.h”。 停止。
// 解决方案为 在Makefile顶部中的增加top_srcdir = ../..5）安装 gem (gem为 ruby 的一个库)
gem install redis
//出现异常：/usr/bin/gem: No such file or directory
//解决方案：ln -s /usr/local/rvm/bin/gem /usr/bin/gem二 配置 redis 集群
redis 集群配置最少为 6 个redis-server 实例对象，支持分布式部署（配置在不同的物理机上）。此例仅配置一台物理机上讲解，配置 6 个redis-server 实例对象，对应端口号为7000，7001，7002 ，7003，7004，7005。以下为配置集群 实例不够时的提示
*** ERROR: Invalid configuration for cluster creation.
*** Redis Cluster requires at least 3 master nodes.
*** This is not possible with 3 nodes and 1 replicas per node.
*** At least 6 nodes are required.若配置不同机器，按照上述一步骤先配置redis
$ cd redis
$ mkdir redisCluster
$ cd redisCluster
$ mkdir 7000
$ mkdir 7001
$ mkdir 7002
$ mkdir 7003
$ mkdir 7004
$ mkdir 7005配置redis 配置文件: 拷贝redis 目录下redis.conf 分别放置在7000 ~ 7005 文件夹中。重命名各个文件夹下的 redis.conf 为 redis7000.conf redis7001.conf redis7002.conf redis7003.conf redis7004.conf redis7005.conf
$ echo /usr/local/redis/redisCluster/7000 /usr/local/redis/redisCluster/7001 /usr/local/redis/redisCluster/7002 /usr/local/redis/redisCluster/7003 /usr/local/redis/redisCluster/7004 /usr/local/redis/redisCluster/7005 | xargs -n 1 cp -v redis.conf分别修改 redis7001.conf ~ redis7005.conf 为以下内容
bind 127.0.0.1 // 绑定的ip 地址
port xxx // 修改为所要启动的端口号 如：7000 7001 或 7002
daemonize yes // 后台启动
pidfile /var/run/redis_7000.pid //pidfile文件对应7000,7001,7002
cluster-enabled yes //开启集群
cluster-config-file nodes_7000.conf //集群配置文件 分别对应 nodes_7000.conf nodes_7001.conf nodes_7002.conf 等
cluster-node-timeout 5000 //请求超时 优化为5秒
appendonly yes //aof日志开启 用于持久化启动 各个 redis 进程
$ redis-server /usr/local/redis/redisCluster/7000/redis7000.conf
12403:C 18 Oct 2019 11:03:48.503 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
12403:C 18 Oct 2019 11:03:48.503 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=12403, just started
12403:C 18 Oct 2019 11:03:48.503 # Configuration loaded
$ redis-server /usr/local/redis/redisCluster/7001/redis7001.conf
12417:C 18 Oct 2019 11:03:57.097 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
12417:C 18 Oct 2019 11:03:57.097 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=12417, just started
12417:C 18 Oct 2019 11:03:57.097 # Configuration loaded
$ redis-server /usr/local/redis/redisCluster/7002/redis7002.conf
12431:C 18 Oct 2019 11:04:02.845 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
12431:C 18 Oct 2019 11:04:02.845 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=12431, just started
12431:C 18 Oct 2019 11:04:02.845 # Configuration loaded
$ redis-server /usr/local/redis/redisCluster/7003/redis7003.conf
12723:C 18 Oct 2019 11:13:56.317 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
12723:C 18 Oct 2019 11:13:56.317 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=12723, just started
12723:C 18 Oct 2019 11:13:56.317 # Configuration loaded
$ redis-server /usr/local/redis/redisCluster/7004/redis7004.conf
12737:C 18 Oct 2019 11:14:05.812 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
12737:C 18 Oct 2019 11:14:05.812 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=12737, just started
12737:C 18 Oct 2019 11:14:05.812 # Configuration loaded
$ redis-server /usr/local/redis/redisCluster/7005/redis7005.conf
12751:C 18 Oct 2019 11:14:13.707 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
12751:C 18 Oct 2019 11:14:13.707 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=12751, just started
12751:C 18 Oct 2019 11:14:13.707 # Configuration loaded启动集群
如出现类似Connection refused，参考下面步骤，否则跳过此步骤
【通过ip访问：（非127.0.0.1）
究其原因：
redis.conf文件中配置了访问限制，通过bind来限制了ip访问，默认为127.0.0.1
注释掉bind之后，本地可以通过ip访问，但是其他主机无法访问，在redis3之后，有一个protected-mode 参数，默认开启 yes
需要添加参数 requirepass abc （密码），或将protected-mode 修改为no。重启redis服务即可
当开启密码验证时，使用 redis-cli 需要 增加参数 -a pass】
————————————————
$ redis-cli --cluster create 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 --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 127.0.0.1:7004 to 127.0.0.1:7000
Adding replica 127.0.0.1:7005 to 127.0.0.1:7001
Adding replica 127.0.0.1:7003 to 127.0.0.1:7002
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 3164b50d6730a8ef5a8ce6dfbed7c62dbee2d218 127.0.0.1:7000
slots:[0-5460] (5461 slots) master
M: 1f11498d90ac3d7597a4ffcd03e7bdb3a7694290 127.0.0.1:7001
slots:[5461-10922] (5462 slots) master
M: 9538716cb886950454827ba3964bf5d1e72510cc 127.0.0.1:7002
slots:[10923-16383] (5461 slots) master
S: db41dd4dbc796bfba395c6b7414b023f2056bd4b 127.0.0.1:7003
replicates 1f11498d90ac3d7597a4ffcd03e7bdb3a7694290
S: d45e14db110b5be6bc289a07ce091a7e42e5582c 127.0.0.1:7004
replicates 9538716cb886950454827ba3964bf5d1e72510cc
S: cd72ecfe4d8965ce004b6b5dd3ef98d8d1bbd626 127.0.0.1:7005
replicates 3164b50d6730a8ef5a8ce6dfbed7c62dbee2d218
Can I set the above configuration? (type 'yes' to accept): 输入 yes
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.以上配置为 3 主 3 从 redis集群 ，
所有集群启动成功 哈哈 ~