这里创建6个redis节点，其中三个为主节点，三个为从节点。
redis和端口对应关系：
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
从：
127.0.0.1:7003
127.0.0.1:7004
127.0.0.1:7005

步骤：
1,下载redis。官网下载3.0.0版本，之前几的版本不支持集群模式
下载地址：http://download.redis.io/releases/redis-3.0.0.tar.gz

2：上传服务器，解压，编译

tar -zxvf redis-3.0.0.tar.gz
mv redis-3.0.0 redis3.0
cd /usr/local/redis3.0
make & make install

3：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/redis3.0/* /usr/local/cluster/7000/
cp -rf /usr/local/redis3.0/* /usr/local/cluster/7001/
cp -rf /usr/local/redis3.0/* /usr/local/cluster/7002/
cp -rf /usr/local/redis3.0/* /usr/local/cluster/7003/
cp -rf /usr/local/redis3.0/* /usr/local/cluster/7004/
cp -rf /usr/local/redis3.0/* /usr/local/cluster/7005/

4：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

port 7000
daemonize yes
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes

同样再对其它配置文件进行修改

vi /usr/local/cluster/7001/redis.conf
vi /usr/local/cluster/7002/redis.conf
vi /usr/local/cluster/7003/redis.conf
vi /usr/local/cluster/7004/redis.conf
vi /usr/local/cluster/7005/redis.conf

注意：不同的目录配置不同的redis.conf中的port

5：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

6,创建redis集群

cd /usr/local/redis3.0/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

6.1执行上面的命令的时候会报错，因为是执行的的脚本，需要
错误内容：/usr/bin/env: ruby: No such file or directory
所以需要安装ruby的环境，这里推荐使用yum install ruby

yum install ruby

6.2然后再执行第步的创建集群命令，还会报错，提示缺少rubygems组件
错误内容：
./redis-trib.rb:24:in `require': no such file to load -- rubygems (LoadError)
from ./redis-trib.rb:24

yum install rubygems

6.3再次执行第步的命令，还会报错，提示不能加载redis，是因为缺少redis的接口
错误内容：
/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

gem install redis
这里可能无法安装,因为无法连接gem服务器：
[@zw_22_90 src]# gem install redis --version 3.0.0
ERROR: Could not find a valid gem 'redis' (= 3.0.0) in any repository
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)

需要手工下载并安装：

wget https://rubygems.global.ssl.fastly.net/gems/redis-3.2.1.gem
gem install -l ./redis-3.2.1.gem

6.4 再次执行第步的命令，正常执行
输入yes，然后配置完成。

[@zw_22_90 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

>>> 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: 2022f24d581b4a7c3342e3245c32927cbd5ec16d 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
M: 37b7008f80f8c21a698da8cb1f1b32db8c0c415c 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
M: ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd 127.0.0.1:7002
   slots:10923-16383 (5461 slots) master
S: b5b76d70bbb0dbf3e7df8a38f1259e95e2054721 127.0.0.1:7003
   replicates 2022f24d581b4a7c3342e3245c32927cbd5ec16d
S: 6881f8fef9c25da486f320ebf2ead39c1502db4c 127.0.0.1:7004
   replicates 37b7008f80f8c21a698da8cb1f1b32db8c0c415c
S: f090526d32cced97731eef2a2e1722a7bac7d9ea 127.0.0.1:7005
   replicates ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd
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: 2022f24d581b4a7c3342e3245c32927cbd5ec16d 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
M: 37b7008f80f8c21a698da8cb1f1b32db8c0c415c 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
M: ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd 127.0.0.1:7002
   slots:10923-16383 (5461 slots) master
M: b5b76d70bbb0dbf3e7df8a38f1259e95e2054721 127.0.0.1:7003
   slots: (0 slots) master
   replicates 2022f24d581b4a7c3342e3245c32927cbd5ec16d
M: 6881f8fef9c25da486f320ebf2ead39c1502db4c 127.0.0.1:7004
   slots: (0 slots) master
   replicates 37b7008f80f8c21a698da8cb1f1b32db8c0c415c
M: f090526d32cced97731eef2a2e1722a7bac7d9ea 127.0.0.1:7005
   slots: (0 slots) master
   replicates ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd
[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！

验证集群

（1）连接任意一个客户端即可：./redis-cli -c -h -p （-c表示集群模式，指定ip地址和端口号）如：/usr/local/redis-cluster/bin/redis-cli -c -h 192.168.1.117 -p 700
（2）进行验证：cluster info（查看集群信息）、cluster nodes（查看节点列表）
（3）进行数据操作验证
（4）关闭集群则需要逐个进行关闭，使用命令：
/usr/local/redis-cluster/bin/redis-cli -c -h 192.168.1.117 -p 7001 shutdown

注意：当出现集群无法启动时，删除临时的数据文件，再次重新启动每一个redis服务，然后重新构造集群环境。

集群操作，动态添加减少节点等问题

redis集群操作主要命令：
create：构建集群
fix：单点修复
check：集群验证
add-node：添加节点
del-node：删除节点
reshard：重新分片