redis（二十二)：Redis 集群（proxy 型）一

redis伪集群搭建

搭建环境是vmware虚拟机+ubuntu-14.04，以redis伪集群的方式搭建搭建，一共实现了6台机器集群的搭建，三个master节点和三个slave节点。

<pre name="code" class="cpp">#首先安装redis的集群管理需要ruby和zlib
sudo apt-get install zlib ruby
#以及安装和redis有关的ruby package
sudo gem install redis
#下载安装包，编译安装redis-3.0.
mkdir redis
wget http://download.redis.io/releases/redis-3.0.0.tar.gz
tar -zxvf redis-3.0..tar.gz
cd redis-3.0.
make & make test &make install

编译安装以后，运行redis-server如果打印出以下的结果就表示安装成功了。

<pre name="code" class="cpp">:C  Oct ::12.324 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
:M  Oct ::12.325 # You requested maxclients of  requiring at least  max file descriptors.
:M  Oct ::12.325 # Redis can't set maximum open files to 10032 because of OS error: Operation not permitted.
:M  Oct ::12.326 # Current maximum open files is . maxclients has been reduced to  to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 3.0. (/)  bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port:
 |    `-._   `._    /     _.-'    |     PID: 61702
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           http://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'                                               

:M  Oct ::12.332 # Server started, Redis version 3.0.
:M  Oct ::12.332 # WARNING overcommit_memory is set to ! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
:M  Oct ::12.332 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
:M  Oct ::12.333 # WARNING: The TCP backlog setting of  cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of .
:M  Oct ::12.333 * The server is now ready to accept connections on port 

然后我们关闭掉已经打开的redis-server程序，开始伪集群的搭建。

首先在redis-3.0.0目录下创建cluster目录

<pre name="code" class="cpp">ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ mkdir cluster
ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ cd cluster
#创建node-.conf node-.conf node-.conf node-.conf  node-.conf  node-.conf
#这些分别是7000，，，，，7005六个节点的redis-server配置文件
#配置文件内容如下
ubuntu@ubuntu-virtual-machine:~/redis-3.0./cluster$ cat node-.conf
pidfile /home/ubuntu/redis-3.0./cluster/pid/node7000.pid
logfile "/home/ubuntu/redis-3.0.0/cluster/logs/node-7000.log"
dir /home/ubuntu/redis-3.0./cluster/data/node-
port
daemonize yes
cluster-enabled yes
cluster-config-file node-.conf
cluster-node-timeout
appendonly yes

ubuntu@ubuntu-virtual-machine:~/redis-3.0./cluster$ cat node-.conf
pidfile /home/ubuntu/redis-3.0./cluster/pid/node7001.pid
logfile "/home/ubuntu/redis-3.0.0/cluster/logs/node-7001.log"
dir /home/ubuntu/redis-3.0./cluster/data/node-
port
daemonize yes
cluster-enabled yes
cluster-config-file node-.conf
cluster-node-timeout
appendonly yes

ubuntu@ubuntu-virtual-machine:~/redis-3.0./cluster$ cat node-.conf
pidfile /home/ubuntu/redis-3.0./cluster/pid/node7002.pid
logfile "/home/ubuntu/redis-3.0.0/cluster/logs/node-7002.log"
dir /home/ubuntu/redis-3.0./cluster/data/node-
port
daemonize yes
cluster-enabled yes
cluster-config-file node-.conf
cluster-node-timeout
appendonly yes

ubuntu@ubuntu-virtual-machine:~/redis-3.0./cluster$ cat node-.conf
pidfile /home/ubuntu/redis-3.0./cluster/pid/node7003.pid
logfile "/home/ubuntu/redis-3.0.0/cluster/logs/node-7003.log"
dir /home/ubuntu/redis-3.0./cluster/data/node-
port
daemonize yes
cluster-enabled yes
cluster-config-file node-.conf
cluster-node-timeout
appendonly yes

ubuntu@ubuntu-virtual-machine:~/redis-3.0./cluster$ cat node-.conf
pidfile /home/ubuntu/redis-3.0./cluster/pid/node7004.pid
logfile "/home/ubuntu/redis-3.0.0/cluster/logs/node-7004.log"
dir /home/ubuntu/redis-3.0./cluster/data/node-
port
daemonize yes
cluster-enabled yes
cluster-config-file node-.conf
cluster-node-timeout
appendonly yes

ubuntu@ubuntu-virtual-machine:~/redis-3.0./cluster$ cat node-.conf
pidfile /home/ubuntu/redis-3.0./cluster/pid/node7005.pid
logfile "/home/ubuntu/redis-3.0.0/cluster/logs/node-7005.log"
dir /home/ubuntu/redis-3.0./cluster/data/node-
port
daemonize yes
cluster-enabled yes
cluster-config-file node-.conf
cluster-node-timeout
appendonly yes

最后在cluster目录下创建log data文件夹，以及node-7000.log   node-7001.log   node-7002.log   node-7003.log   #node-7004.log   node-7005.log等6哥log文件，最后cluster目录下的文件如下：

<pre name="code" class="cpp">ubuntu@ubuntu-virtual-machine:~/redis-3.0./cluster$ ls
data  node-.conf  node-.conf  node-.conf  node-.conf  node-.conf  node-.conf
logs  node-.log   node-.log   node-.log   node-.log   node-.log   node-.log

最后，配置文件都ok了，开始启动6个”单机”redis-server服务，启动命令如下：

<pre name="code" class="cpp">ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ redis-server cluster/node-.conf
ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ redis-server cluster/node-.conf
ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ redis-server cluster/node-.conf
ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ redis-server cluster/node-.conf
ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ redis-server cluster/node-.conf
ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ redis-server cluster/node-.conf

把每一台机器加入集群中

<pre name="code" class="cpp">ubuntu@ubuntu-virtual-machine:~/redis-3.0.$ ./src/redis-trib.rb create --replicas  192.168.39.153: 192.168.39.153: 192.168.39.153: 192.168.39.153: 192.168.39.153: 192.168.39.153:

打印出以下的结果，就代表集群启动成功了。

<pre name="code" class="cpp">: 192.168.39.153: 192.168.39.153:
>>> Creating cluster
Connecting to node 192.168.39.153:: OK
Connecting to node 192.168.39.153:: OK
Connecting to node 192.168.39.153:: OK
Connecting to node 192.168.39.153:: OK
Connecting to node 192.168.39.153:: OK
Connecting to node 192.168.39.153:: OK
>>> Performing hash slots allocation on  nodes...
Using  masters:
192.168.39.153:
192.168.39.153:
192.168.39.153:
Adding replica 192.168.39.153: to 192.168.39.153:
Adding replica 192.168.39.153: to 192.168.39.153:
Adding replica 192.168.39.153: to 192.168.39.153:
M: 57d0ccdc7dc98ab786c961e0979b8a8f135f60cd 192.168.39.153:
   slots:- ( slots) master
M: adfbf48901b1e7e7e7e2fe0a1b87c86f57530ebd 192.168.39.153:
   slots:- ( slots) master
M: 314cbd10bbc4c1339fb737575af41f04408c2087 192.168.39.153:
   slots:- ( slots) master
S: fb2d1830a4b429fcb80da7edbbdacc50ed439d63 192.168.39.153:
   replicates 57d0ccdc7dc98ab786c961e0979b8a8f135f60cd
S: 1384a16ccb208828d9634f49695556ae11ec57a7 192.168.39.153:
   replicates adfbf48901b1e7e7e7e2fe0a1b87c86f57530ebd
S: 9d9350c96c50fe88621575047a6a07250a287b51 192.168.39.153:
   replicates 314cbd10bbc4c1339fb737575af41f04408c2087
Can I set the above configuration? (type 'yes' to accept): yes#这里输入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 192.168.39.153:)
M: 57d0ccdc7dc98ab786c961e0979b8a8f135f60cd 192.168.39.153:
   slots:- ( slots) master
M: adfbf48901b1e7e7e7e2fe0a1b87c86f57530ebd 192.168.39.153:
   slots:- ( slots) master
M: 314cbd10bbc4c1339fb737575af41f04408c2087 192.168.39.153:
   slots:- ( slots) master
M: fb2d1830a4b429fcb80da7edbbdacc50ed439d63 192.168.39.153:
   slots: ( slots) master
   replicates 57d0ccdc7dc98ab786c961e0979b8a8f135f60cd
M: 1384a16ccb208828d9634f49695556ae11ec57a7 192.168.39.153:
   slots: ( slots) master
   replicates adfbf48901b1e7e7e7e2fe0a1b87c86f57530ebd
M: 9d9350c96c50fe88621575047a6a07250a287b51 192.168.39.153:
   slots: ( slots) master
   replicates 314cbd10bbc4c1339fb737575af41f04408c2087
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All  slots covered.

至此，一个集群就搭建起来了，从上边的信息我们也可以看出来，192.168.39.153:7000，192.168.39.153:7001，192.168.39.153:7002是master节点，另外三个是slave节点。

本文参考了http://lib.csdn.net/article/redis/35915
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原文链接：https://blog.csdn.net/sanwenyublog/article/details/52946669