就让我
她不在这里,她无处追寻,可她在我心里 -- 挥之不去
redis cluster 搭建

redis cluster 是 redis 官方一个高可用解决方案,cluster 中 redis 共有 2^14 (16384)个slot 槽。创建 cluster 后会平均分配到每个 redis 上。cluster 可以对标 分片机制。

这里介绍为本机启动6个redis集群服务,并使用 redis-trib.rb 创建 3主3从的 cluster 。

主要步骤:

1. 创建 redis 各实例目录
2. 配置 redis 各实例配置文件
3. 启动 redis 各实例
4. 执行 redis cluster 脚本搭建集群

与普通 redis 实例不同之处在于 2和4步骤 配置文件和执行 redis cluster 脚本搭建集群,详细如下:

1、redis 服务数据目录

mkdir cluster
cd cluster
mkdir 6400 6401 6402 6403 6404 6405

2、配置文件

vim 6400/redis.conf
port 6400
dir "/usr/local/redis-3.2.9/cluster/6400"
pidfile "/usr/local/redis-3.2.9/cluster/6400/redis.pid"
logfile "/usr/local/redis-3.2.9/cluster/6400/redis.log"
cluster-enabled yes
cluster-config-file nodes-6400.conf
appendonly yes
dbfilename "dump.rdb"
bind 192.168.33.11
daemonize yes

对应其他 5个配置文件,

cp 6400/redis.conf 6401/redis.conf && sed -i "s/6400/6401/g" 6401/redis.conf
...
cp 6400/redis.conf 6405/redis.conf && sed -i "s/6400/6405/g" 6405/redis.conf

3、启动 redis 服务

./src/redis-server cluster/6400/redis.conf
...
./src/redis-server cluster/6405/redis.conf

4、创建 cluster 集群

 redis 很贴心的自带提供 ruby 脚本< ./src/redis-trib.rb > 创建集群,但是需要安装 ruby 相关信息

安装rubyyum install ruby
安装rubygemsyum install rubygems
安装rubyredis驱动:gem install redis
可能还需要安装:
安装gccyum install gcc
安装zlibyum install zib

搭建集群了,很简单,执行命令:

./src/redis-trib.rb create --replicas 1 192.168.33.11:6400 192.168.33.11:6401 192.168.33.11:6402 192.168.33.11:6403 192.168.33.11:6404 192.168.33.11:6405 

以上命令得到如下结果

>>> Creating cluster
>>> Performing hash slots allocation on 7 nodes...
Using 3 masters:
192.168.33.11:6400
192.168.33.11:6401
192.168.33.11:6402
Adding replica 192.168.33.11:6403 to 192.168.33.11:6400
Adding replica 192.168.33.11:6404 to 192.168.33.11:6401
Adding replica 192.168.33.11:6405 to 192.168.33.11:6402
M: d53cbf49fea9403bd4bb4835c45679d8014c8a11 192.168.33.11:6400
   slots:0-5460 (5461 slots) master
M: da9ffc92d337467975063ac7b82b9b6895b1c93b 192.168.33.11:6401
   slots:5461-10922 (5462 slots) master
M: df494c2c1152d2125ab92148fe772cf92e0e8abd 192.168.33.11:6402
   slots:10923-16383 (5461 slots) master
S: d0296ce856cfe94b7aad0600a7d16c9dc3995608 192.168.33.11:6403
   replicates d53cbf49fea9403bd4bb4835c45679d8014c8a11
S: db28b4113c7faeba02d8f9c5e821d7de00df2f5f 192.168.33.11:6404
   replicates da9ffc92d337467975063ac7b82b9b6895b1c93b
S: 03abf7aaa2b4d3399b26c64d476f1a561215366f 192.168.33.11:6405
   replicates df494c2c1152d2125ab92148fe772cf92e0e8abd
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 192.168.33.11:6400)
M: d53cbf49fea9403bd4bb4835c45679d8014c8a11 192.168.33.11:6400
   slots:0-5460 (5461 slots) master
   2 additional replica(s)
S: 03abf7aaa2b4d3399b26c64d476f1a561215366f 192.168.33.11:6405
   slots: (0 slots) slave
   replicates df494c2c1152d2125ab92148fe772cf92e0e8abd
M: da9ffc92d337467975063ac7b82b9b6895b1c93b 192.168.33.11:6401
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: db28b4113c7faeba02d8f9c5e821d7de00df2f5f 192.168.33.11:6404
   slots: (0 slots) slave
   replicates da9ffc92d337467975063ac7b82b9b6895b1c93b
M: df494c2c1152d2125ab92148fe772cf92e0e8abd 192.168.33.11:6402
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: d0296ce856cfe94b7aad0600a7d16c9dc3995608 192.168.33.11:6403
   slots: (0 slots) slave
   replicates d53cbf49fea9403bd4bb4835c45679d8014c8a11
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

最后查看集群信息

./src/redis-cli -h 192.168.33.11 -p 6400

参考:

http://www.cnblogs.com/rwxwsblog/p/6030606.html
http://www.cnblogs.com/junl0513/p/833f4d3eefc69485958fe83b5c9057d7.html
http://blog.51yip.com/nosql/1726.html 【cluster 命令行管理】

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