一、前提：
（1）集群一般由多个节点组成，节点数量至少6个才能保证组成完整高可用的集群。资源有限，这里使用4台服务器模拟6个节点（用端口区分），如下图：
| host | ip | software | port1 | port2 | system | role |
|---|---|---|---|---|---|---|
| master | 192.168.2.158 | redis-4.0.8 | 7001 | centos7 | m1 | |
| slave1 | 192.168.2.159 | redis-4.0.8 | 7002 | 7003 | centos7 | m2,m3 |
| slave2 | 192.168.2.178 | redis-4.0.8 | 7004 | centos7 | s1 | |
| slave3 | 192.168.2.179 | redis-4.0.8 | 7005 | 7006 | centos7 | s2,s3 |
（2）Redis使用稳定版本：redis-4.0.8.tar.gz；
（3）每个节点需要开启配置文件中的cluster-enabled yes，让Redis运行在集群模式下。
（4）Redis需要安装依赖库，所有机器都要安装：
yum install gcc gcc-c++ kernel-devel automake autoconf libtool make wget tcl vim psmisc ruby rubygems ruby-devel rpm-build unzip git -y
二、配置单机Redis：
首先要注意在生产环境中目录结构要定义好，防止在项目过多的时候找不到所需的项目
- 目录统一放在/home下面 ，首先创建redis项目目录
cd /home
#创建项目目录
mkdir redis
cd /home/redis
- 将 redis-4.0.8.tar.gz 放在 /home/redis下，并解压缩，解压缩完成后可删除安装包：
#解压缩
tar -zxvf redis-4.0.8.tar.gz
#完成后可删除
rm -f redis-4.0.8.tar.gz
- 编译安装：
cd /home/redis/redis-4.0.8/
#编译安装
make && make install
#检查一下版本
redis-server -v
4)启动redis
cd /home/redis/redis-4.0.8/src/
#启动
./redis-server ../redis.conf
5)测试单机redis是否启动成功
新开终端，打开redis客户端
cd /home/redis/redis-4.0.8/src/
#连接redis
./redis-cli
#显示如下：
127.0.0.1：6379>
所有机器都需要安装redis，可以scp复制后再make & make install安装测试
6)单机redis，开机自启动
（1）编辑配置文件，将bind和daemonize改为如下：
bind 0.0.0.0
（2）添加开机启动服务：
vi /etc/systemd/system/redis-server.service
粘贴一下内容
[Unit]
Description=The redis-server Process Manager
After=syslog.target network.target
[Service]
Type=simple
PIDFile=/var/run/redis_6379.pid
ExecStart=/home/redis/redis-4.0.8/src/redis-server /home/redis/redis-4.0.8/redis.conf
ExecReload=/bin/kill -USR2 $MAINPID
ExecStop=/bin/kill -SIGINT $MAINPID
[Install]
WantedBy=multi-user.target
（3） 设置开机启动：
systemctl daemon-reload
systemctl start redis-server.service
systemctl enable redis-server.service
（4） 检查是否安装成功：
ps -ef|grep redis
三、配置Redis集群：
- 安装ruby依赖，由于yum命令安装的ruby版本太低，需自行升级，这里采用rvm来更新ruby。
（1）安装RVM:
#安装curl
yum install curl
#建立信任通信
gpg2 --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3
#下载安装rvm
curl -L get.rvm.io | bash -s stable
#查看安装路径
find / -name rvm -print
#使rvm生效
source /usr/local/rvm/scripts/rvm
（2）查看rvm库中已知的ruby版本
rvm list known
#显示结果如下：
MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.7]
[ruby-]2.3[.4]
[ruby-]2.4[.1]
ruby-head
（3）安装一个ruby版本
rvm install 2.4.1
（4）使用一个ruby版本
rvm use 2.4.1
（5）设置默认版本
rvm use 2.4.1 --default
（6）卸载一个已知版本
rvm remove 2.0.0
（7）查看ruby版本:
ruby --version
（8）安装gem redis:
gem install redis
所有机器都需要安装ruby
（4）检查redis-trib.rb的可用性：
cd /home/redis/redis-4.0.8/src/
./redis-trib.rb
#出现如下，则代表可用
Usage: redis-trib <command> <options> <arguments ...>
create host1:port1 ... hostN:portN
--replicas <arg>
check host:port
info host:port
fix host:port
--timeout <arg>
reshard host:port
--from <arg>
--to <arg>
--slots <arg>
--yes
--timeout <arg>
--pipeline <arg>
rebalance host:port
--weight <arg>
--auto-weights
--use-empty-masters
--timeout <arg>
--simulate
--pipeline <arg>
--threshold <arg>
add-node new_host:new_port existing_host:existing_port
--slave
--master-id <arg>
del-node host:port node_id
set-timeout host:port milliseconds
call host:port command arg arg .. arg
import host:port
--from <arg>
--copy
--replace
help (show this help)
For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.
- 配置每个节点
（1）在master上：
#在/home/redis/目录下新建一个redis-cluster文件夹
cd /home/redis/
mkdir -p redis-cluster
#新建1个文件夹，用来区分节点
cd /home/redis/redis-cluster
mkdir -p 7001
#复制配置文件到新文件夹下
cp /home/redis/redis-4.0.8/redis.conf /home/redis/redis-cluster/7001/redis.conf
#编辑配置文件
vi /home/redis/redis-cluster/7001/redis.conf
必要需要修改如下，其他细化优化的配置项可暂时保持默认
bind master #本机IP
port 7001 #改为设定的端口
pidfile /var/run/redis_7001.pid #pid存放地址
daemonize yes #后台启动
cluster-enabled yes #启动集群模式
cluster-config-file nodes-7001.conf #集群内部配置文件，改掉端口号
cluster-node-timeout 15000 #节点超时时间，单位：毫秒
（2）在slave1上：
#新建1个文件夹，用来区分节点
cd /home/redis/redis-cluster
mkdir -p 7002
mkdir -p 7003
#......其他操作，参考master......
（3）在slave2上：
#新建1个文件夹，用来区分节点
cd /home/redis/redis-cluster
mkdir -p 7004
#......其他操作，参考master......
（4）在slave3上：
#新建1个文件夹，用来区分节点
cd /home/redis/redis-cluster
mkdir -p 7005
mkdir -p 7006
#......其他操作，参考master......
（5）启动节点
#master
redis-server /home/redis/redis-cluster/7001/redis.conf
#slave1
redis-server /home/redis/redis-cluster/7002/redis.conf
redis-server /home/redis/redis-cluster/7003/redis.conf
#slave2
redis-server /home/redis/redis-cluster/7004/redis.conf
#slave3
redis-server /home/redis/redis-cluster/7005/redis.conf
redis-server /home/redis/redis-cluster/7006/redis.conf
#查看redis状态
ps -ef|grep redis
#停止服务
redis-cli -h master -p 7001 shutdown
redis-cli -h slave1 -p 7002 shutdown
redis-cli -h slave1 -p 7003 shutdown
redis-cli -h slave2 -p 7004 shutdown
redis-cli -h slave3 -p 7005 shutdown
redis-cli -h slave3 -p 7006 shutdown
（6）创建集群
#在master上运行（使用ip ：port）
cd /home/redis/redis-4.0.8/src/
./redis-trib.rb create --replicas 1 192.168.2.158:7001 192.168.2.159:7002 192.168.2.159:7003 192.168.2.177:7004 192.168.2.178:7005 192.168.2.178:7006
如果出现下述错误：
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.2.158:7001
192.168.2.159:7002
192.168.2.177:7004
Adding replica 192.168.2.159:7003 to 192.168.2.158:7001
Adding replica 192.168.2.178:7006 to 192.168.2.159:7002
Adding replica 192.168.2.178:7005 to 192.168.2.177:7004
M: d3ca605d95094a7699418de2520312e509cc4c8a 192.168.2.158:7001
slots:0-5460 (5461 slots) master
M: bbc9da22c5a9fcaad9b99ce60b8503c0d91091e9 192.168.2.159:7002
slots:5461-10922 (5462 slots) master
S: 7ea311b36f527d0a5b95cf5e2629e0ad9e56047c 192.168.2.159:7003
replicates d3ca605d95094a7699418de2520312e509cc4c8a
M: 43ceef9949a28548c6f1fa66a75ddce3c33a2374 192.168.2.177:7004
slots:10923-16383 (5461 slots) master
S: 0214320aeddb789abc452c48871bcc9ee02fd7a7 192.168.2.178:7005
replicates 43ceef9949a28548c6f1fa66a75ddce3c33a2374
S: b39f1ac1c78a77ccf656a5bf5fc8c0cebd01a787 192.168.2.178:7006
replicates bbc9da22c5a9fcaad9b99ce60b8503c0d91091e9
Can I set the above configuration? (type 'yes' to accept): yes
/usr/local/rvm/gems/ruby-2.4.1/gems/redis-4.0.1/lib/redis/client.rb:119:in `call': ERR Slot 0 is already busy (Redis::CommandError)
from /usr/local/rvm/gems/ruby-2.4.1/gems/redis-4.0.1/lib/redis.rb:2764:in `block in method_missing'
from /usr/local/rvm/gems/ruby-2.4.1/gems/redis-4.0.1/lib/redis.rb:45:in `block in synchronize'
from /usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/monitor.rb:214:in `mon_synchronize'
from /usr/local/rvm/gems/ruby-2.4.1/gems/redis-4.0.1/lib/redis.rb:45:in `synchronize'
from /usr/local/rvm/gems/ruby-2.4.1/gems/redis-4.0.1/lib/redis.rb:2763:in `method_missing'
from ./redis-trib.rb:212:in `flush_node_config'
from ./redis-trib.rb:906:in `block in flush_nodes_config'
from ./redis-trib.rb:905:in `each'
from ./redis-trib.rb:905:in `flush_nodes_config'
from ./redis-trib.rb:1426:in `create_cluster_cmd'
from ./redis-trib.rb:1830:in `<main>'
解决方法如下：
（a）删除所有节点得
#1.删除dump.rdb
cd /home/redis/redis-4.0.8
rm -f dump.rdb
#2.删除所有节点得node-700x.conf文件
（b）运行以下代码：
redis-cli -p 7001 -h master FLUSHALL
redis-cli -p 7001 -h master CLUSTER RESET SOFT
redis-cli -p 7002 -h slave1 FLUSHALL
redis-cli -p 7002 -h slave1 CLUSTER RESET SOFT
redis-cli -p 7003 -h slave1 FLUSHALL
redis-cli -p 7003 -h slave1 CLUSTER RESET SOFT
redis-cli -p 7004 -h slave2 FLUSHALL
redis-cli -p 7004 -h slave2 CLUSTER RESET SOFT
redis-cli -p 7005 -h slave3 FLUSHALL
redis-cli -p 7005 -h slave3 CLUSTER RESET SOFT
redis-cli -p 7006 -h slave3 FLUSHALL
redis-cli -p 7006 -h slave3 CLUSTER RESET SOFT
（c）重启redis服务，最后启动集群，正确结果如下：
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.2.158:7001
192.168.2.159:7002
192.168.2.177:7004
Adding replica 192.168.2.159:7003 to 192.168.2.158:7001
Adding replica 192.168.2.178:7006 to 192.168.2.159:7002
Adding replica 192.168.2.178:7005 to 192.168.2.177:7004
M: 3198f98b2a6df119ae66dc98cf2e13ce9f70e1e6 192.168.2.158:7001
slots:0-5460 (5461 slots) master
M: b24938d9fd4f79e7a27ba6c532d1333230089859 192.168.2.159:7002
slots:5461-10922 (5462 slots) master
S: 0b97a68fc49b9e4c5ee21ef4428bba98bac13e0f 192.168.2.159:7003
replicates 3198f98b2a6df119ae66dc98cf2e13ce9f70e1e6
M: 9ce4c626e9552ea3d1ceeec998994a85e6379ddf 192.168.2.177:7004
slots:10923-16383 (5461 slots) master
S: 62a75986d63859a6af3a307548b76cd43f1ecf56 192.168.2.178:7005
replicates 9ce4c626e9552ea3d1ceeec998994a85e6379ddf
S: b39f1ac1c78a77ccf656a5bf5fc8c0cebd01a787 192.168.2.178:7006
replicates b24938d9fd4f79e7a27ba6c532d1333230089859
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 192.168.2.158:7001)
M: 3198f98b2a6df119ae66dc98cf2e13ce9f70e1e6 192.168.2.158:7001
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 62a75986d63859a6af3a307548b76cd43f1ecf56 192.168.2.178:7005
slots: (0 slots) slave
replicates 9ce4c626e9552ea3d1ceeec998994a85e6379ddf
S: b39f1ac1c78a77ccf656a5bf5fc8c0cebd01a787 192.168.2.178:7006
slots: (0 slots) slave
replicates b24938d9fd4f79e7a27ba6c532d1333230089859
M: 9ce4c626e9552ea3d1ceeec998994a85e6379ddf 192.168.2.177:7004
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: b24938d9fd4f79e7a27ba6c532d1333230089859 192.168.2.159:7002
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 0b97a68fc49b9e4c5ee21ef4428bba98bac13e0f 192.168.2.159:7003
slots: (0 slots) slave
replicates 3198f98b2a6df119ae66dc98cf2e13ce9f70e1e6
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
- 测试集群
（1）在master上，创建数据，运行以下代码：
cd /home/redis/redis-4.0.8/src/
#连接redis
./redis-cli -h 192.168.2.158 -c -p 7001
192.168.2.158:7001> set title test
OK
192.168.2.158:7001> get title
"test"
192.168.2.158:7001>
（2）退出后，连接其他终端，进行测试：
./redis-cli -h 192.168.2.178 -c -p 7006
192.168.2.178:7006> get title
-> Redirected to slot [2217] located at 192.168.2.158:7001
"test"
192.168.2.158:7001>
至此，redis集群搭建完毕
