这篇文章主要介绍CentOS6.6如何安装Redis3.0.3集群，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
一个Redis集群，至少需要6个节点，3个为主，3个为从。
IP | 端口 | 节点 |
127.0.0.1 | 7000 | Master |
127.0.0.1 | 7001 | Master |
127.0.0.1 | 7002 | Master |
127.0.0.1 | 7003 | Slave |
127.0.0.1 | 7004 | Slave |
127.0.0.1 | 7005 | Slave |
安装步骤：
一、下载redis3.0.3
# cd /usr/local
# wget http://download.redis.io/releases/redis-3.0.3.tar.gz
二、解压并编译
# tar -zxvf redis-3.0.3.tar.gz
# cd redis-3.0.3
# make
# make test
# make install
执行make install后，在/usr/local/bin目录下可看到生成了一些文件：
# ls /usr/local/bin/
redis-benchmark redis-check-dump redis-sentinel
redis-check-aof redis-cli redis-server
三、创建集群需要的目录并拷贝redis
# mkdir -p /usr/local/cluster
# mkdir -p /usr/local/cluster/7000
# mkdir -p /usr/local/cluster/7001
# mkdir -p /usr/local/cluster/7002
# mkdir -p /usr/local/cluster/7003
# mkdir -p /usr/local/cluster/7004
# mkdir -p /usr/local/cluster/7005
# cp -rf /usr/local/redis-3.0.3/* /usr/local/cluster/7000/
# cp -rf /usr/local/redis-3.0.3/* /usr/local/cluster/7001/
# cp -rf /usr/local/redis-3.0.3/* /usr/local/cluster/7002/
# cp -rf /usr/local/redis-3.0.3/* /usr/local/cluster/7003/
# cp -rf /usr/local/redis-3.0.3/* /usr/local/cluster/7004/
# cp -rf /usr/local/redis-3.0.3/* /usr/local/cluster/7005/
四、修改配置文件redis.conf
# vi /usr/local/cluster/7000/redis.conf
修改配置文件中的下面选项
daemonize yes
port 7000
appendonly yes
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
用7000/redis.conf覆盖7001,7002,7003,7004,7005目录下的redis.conf
# cp /usr/local/cluster/7001/redis.conf /usr/local/cluster/7001
# cp /usr/local/cluster/7001/redis.conf /usr/local/cluster/7002
# cp /usr/local/cluster/7001/redis.conf /usr/local/cluster/7003
# cp /usr/local/cluster/7001/redis.conf /usr/local/cluster/7004
# cp /usr/local/cluster/7001/redis.conf /usr/local/cluster/7005
再修改7001,7002,7003,7004,7005目录下的redis.conf中的port，使得redis.conf中的port与其父目录名称一致，比如7001/redis.conf中的port为7001，7002/redis.conf中的port为7002
五、启动6个redis
# cd /usr/local/cluster/7000/src
# redis-server ../redis.conf
# cd /usr/local/cluster/7001/src
# redis-server ../redis.conf
# cd /usr/local/cluster/7002/src
# redis-server ../redis.conf
# cd /usr/local/cluster/7003/src
# redis-server ../redis.conf
# cd /usr/local/cluster/7004/src
# redis-server ../redis.conf
# cd /usr/local/cluster/7005/src
# redis-server ../redis.conf
启动之后使用命令查看redis的启动情况
# ps -ef | grep redis
root 9656 1 0 20:35 ? 00:00:00 redis-server *:7000 [cluster]
root 9684 1 0 20:37 ? 00:00:00 redis-server *:7001 [cluster]
root 9725 1 0 20:43 ? 00:00:00 redis-server *:7002 [cluster]
root 9730 1 0 20:43 ? 00:00:00 redis-server *:7003 [cluster]
root 9734 1 0 20:43 ? 00:00:00 redis-server *:7004 [cluster]
root 9739 1 0 20:43 ? 00:00:00 redis-server *:7005 [cluster]
root 9743 3288 0 20:43 pts/0 00:00:00 grep redis
六、创建redis集群
1 执行创建redis集群的命令会报错，提示找不到ruby
# cd /usr/local/redis-3.0.3/src
# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 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
/usr/bin/env: ruby: 没有那个文件或目录
解决此错误需要安装ruby，这里推荐使用yum install ruby
# yum install ruby
2 再执行创建集群的命令，还会报错，提示缺少rubygems组件
# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 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
./redis-trib.rb:24:in `require': no such file to load -- rubygems (LoadError)
from ./redis-trib.rb:24
解决此错误需要安装rubygems
# yum install rubygems
3 再次执行创建集群的命令，还会报错，提示不能加载redis，是因为缺少redis的接口
# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 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
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- redis (LoadError)
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from ./redis-trib.rb:25
解决此错误需要安装redis
# gem install redis
Successfully installed redis-3.3.3
1 gem installed
Installing ri documentation for redis-3.3.3...
Installing RDoc documentation for redis-3.3.3...
注意，有时候碰到无法安装的情况，需要手工下载并安装：
# wget https://rubygems.global.ssl.fastly.net/gems/redis-3.3.3.gem
# gem install -l ./redis-3.3.3.gem
4 再次执行安装集群的命令，正常执行
# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 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
>>> Creating cluster
Connecting to node 127.0.0.1:7000: OK
Connecting to node 127.0.0.1:7001: OK
Connecting to node 127.0.0.1:7002: OK
Connecting to node 127.0.0.1:7003: OK
Connecting to node 127.0.0.1:7004: OK
Connecting to node 127.0.0.1:7005: OK
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7003 to 127.0.0.1:7000
Adding replica 127.0.0.1:7004 to 127.0.0.1:7001
Adding replica 127.0.0.1:7005 to 127.0.0.1:7002
M: 747467b5f2e2a472afad96de6c88dc2f3bf5b426 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: 4e4d8ba07d743c4e69fcd5df8867b996084ca4d9 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: a6fe3c0a16bcb465a23147de8a3e242deb87e800 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
S: 827ca514f4289dc4ac4d51308721f90851ae6180 127.0.0.1:7003
replicates 747467b5f2e2a472afad96de6c88dc2f3bf5b426
S: be77a6f99e905109150ceaaa50d357ed86803a4c 127.0.0.1:7004
replicates 4e4d8ba07d743c4e69fcd5df8867b996084ca4d9
S: 1285a04f3628c3e76f14d1036c59aef1cb36258d 127.0.0.1:7005
replicates a6fe3c0a16bcb465a23147de8a3e242deb87e800
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 127.0.0.1:7000)
M: 747467b5f2e2a472afad96de6c88dc2f3bf5b426 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: 4e4d8ba07d743c4e69fcd5df8867b996084ca4d9 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: a6fe3c0a16bcb465a23147de8a3e242deb87e800 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
M: 827ca514f4289dc4ac4d51308721f90851ae6180 127.0.0.1:7003
slots: (0 slots) master
replicates 747467b5f2e2a472afad96de6c88dc2f3bf5b426
M: be77a6f99e905109150ceaaa50d357ed86803a4c 127.0.0.1:7004
slots: (0 slots) master
replicates 4e4d8ba07d743c4e69fcd5df8867b996084ca4d9
M: 1285a04f3628c3e76f14d1036c59aef1cb36258d 127.0.0.1:7005
slots: (0 slots) master
replicates a6fe3c0a16bcb465a23147de8a3e242deb87e800
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
至此redis集群即搭建成功！
七、执行redis-cli命令进入集群环境
# redis-cli -c -p 7000
127.0.0.1:7000> quit;
#
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