Redis 官网集群步骤

1. 创建目录

要让集群正常运作至少需要三个主节点， 不过在刚开始试用集群功能时， 强烈建议使用六个节点： 其中三个为主节点， 而其余三个则是各个主节点的从节点
创建一个新目录 redis，并在其中创建六个以端口号为名字的子目录，每个子目录都是一个 redis

mkdir redis
cd redis
mkdir 7000 7001 7002 7003 7004 7005

2. 修改配置文件

分别进入每个子目录，修改 redis.conf 中如下的配置项

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

其中端口号 port 分别为 7000-7005

3. 运行实例

接着，从 https://github.com/antirez/redis 页面的 unstable 分支中下载最新代码，然后编译出可执行文件放在 redis 文件夹中。（其实从我们的任一子目录里面编译后在 src 文件夹里拿出来也可以）通过如下命令分别创建出 6 个实例

cd 7000
../redis-server ./redis.conf

4. 创建集群

可以使用 src 目录中的 redis-trib 程序来创建集群，首先需要安装 redis gem 才能运行 redis-trib

gem install redis

然后创建集群

./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

然后终端会列出集群的情况，并礼貌性的问你这样创建可以吗，当然是输入 yes

>>> Creating cluster
>>> 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: 968f13cefb4f895cec739794835fcd160bde22af 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
M: 3c088766a36ed8ccd7bef5e6e2fbe75c48bc10c0 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
M: 433145fbee24fa60a3e7194b9b8056b02f375023 127.0.0.1:7002
   slots:10923-16383 (5461 slots) master
S: d29b5ce6e4ea9a33a9044d4211ba37aafa5198f8 127.0.0.1:7003
   replicates 968f13cefb4f895cec739794835fcd160bde22af
S: ba9052a112e11e757a563ce6ed89adde463c7ec5 127.0.0.1:7004
   replicates 3c088766a36ed8ccd7bef5e6e2fbe75c48bc10c0
S: 130bfe6c6e1b8d31ed1e030ae7c41902be268a1f 127.0.0.1:7005
   replicates 433145fbee24fa60a3e7194b9b8056b02f375023
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: 968f13cefb4f895cec739794835fcd160bde22af 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
M: 433145fbee24fa60a3e7194b9b8056b02f375023 127.0.0.1:7002
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
M: 3c088766a36ed8ccd7bef5e6e2fbe75c48bc10c0 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: ba9052a112e11e757a563ce6ed89adde463c7ec5 127.0.0.1:7004
   slots: (0 slots) slave
   replicates 3c088766a36ed8ccd7bef5e6e2fbe75c48bc10c0
S: d29b5ce6e4ea9a33a9044d4211ba37aafa5198f8 127.0.0.1:7003
   slots: (0 slots) slave
   replicates 968f13cefb4f895cec739794835fcd160bde22af
S: 130bfe6c6e1b8d31ed1e030ae7c41902be268a1f 127.0.0.1:7005
   slots: (0 slots) slave
   replicates 433145fbee24fa60a3e7194b9b8056b02f375023
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

到此集群就创建成功了。

但很明显这是个伪集群，如果条件允许的话建议使用 6 台机器来创建集群，只需修改相应的地址和端口，并在防火墙开放该端口就行。

5. 简单测试

使用 redis-cli 进行简单的命令测试

$ redis-cli -c -p 7000
redis 127.0.0.1:7000> set foo bar
-> Redirected to slot [12182] located at 127.0.0.1:7002
OK
redis 127.0.0.1:7002> set hello world
-> Redirected to slot [866] located at 127.0.0.1:7000
OK
redis 127.0.0.1:7000> get foo
-> Redirected to slot [12182] located at 127.0.0.1:7002
"bar"
redis 127.0.0.1:7000> get hello
-> Redirected to slot [866] located at 127.0.0.1:7000
"world"