現在項目上用redis的話，很少說不用集群的情況，畢竟如果生產上只有一臺redis會有極大的風險，比如機器掛掉，或者內存爆掉，就比如我們生產環境曾今也遭遇到這種情況，導致redis內存不夠掛掉的情況，當然這些都是我們及其不能容忍的，第一個必須要做到高可靠，其次才是高性能，好了，下面我來逐一搭建一下。
一：Redis集群搭建
1. 下載
首先去官網下載較新的3.2.0版本，下載方式還是非常簡單的，比如官網介紹的這樣。
$ wget http://download.redis.io/releases/redis-3.2.0.tar.gz
$ tar xzf redis-3.2.0.tar.gz
$ cd redis-3.2.0
$ make
2. redis配置
由于我們要做集群，而且還要redis自帶的redis-trib.rb 能正常運行，我們需要在集群中開啟三臺master，三臺slave，所以這里我需要建立6個文件夾，而且文件夾的名稱就使用端口地址的名字，比如：6389. 6380....6384。
3. config配置。
現在directory的分布情況大致如上圖，接下來要做的事情就是配置redis.conf了，在這里需要配置四個選項。。。
1> port 端口地址，比如6380文件夾下面的port就是6380，
# Accept connections on the specified port, default is 6379 (IANA #815344).
# If port 0 is specified Redis will not listen on a TCP socket.
port 6379
2> cluster-enabled 和 cluster-config-file
這個顧名思義，首先需要開啟redis的cluster模式，然后配置一個cluster-config-file文件，這個文件用于存放redis的實時信息，redis會動態追加和修改這個conf下面的內容信息，不過要記住，這個nodes-6379.conf 可以根據 端口文件夾依次配置，比如6380文件夾可以改成nodes-6380.conf這樣。。。
# Normal Redis instances can't be part of a Redis Cluster; only nodes that are
# started as cluster nodes can. In order to start a Redis instance as a
# cluster node enable the cluster support uncommenting the following:
#
cluster-enabled yes
# Every cluster node has a cluster configuration file. This file is not
# intended to be edited by hand. It is created and updated by Redis nodes.
# Every Redis Cluster node requires a different cluster configuration file.
# Make sure that instances running in the same system do not have
# overlapping cluster configuration file names.
#
cluster-config-file nodes-6379.conf
3> directory
為了方便管理，我這里配置的root目錄取決于在哪個文件夾，比如6380下面我的dir就是: dir ./6380/
# Note that you must specify a directory here, not a file name.
dir ./6379/
4> protected-mode
這個是redis 3.2 才追加的一個功能，從功能注釋中，我們就可以發現，這個默認就是不讓外界可以訪問redis，所以這里我們就改為no，可以遠程訪問。
# By default protected mode is enabled. You should disable it only if
# you are sure you want clients from other hosts to connect to Redis
# even if no authentication is configured, nor a specific set of interfaces
# are explicitly listed using the "bind" directive.
protected-mode no
ok，到現在為止，我們的config就修改完畢了，其他端口的文件夾也可以依次配置之~
二：開啟redis
到現在為止，各個端口文件夾都配置成功了，接下來準備開啟了。
接下來我們可以看一下，在6379下面是不是有生成node-6379.conf文件，比如下面：
三：配置redis-trib.rb
因為redis-trib.rb是ruby寫的，而我們的電腦肯定是沒有ruby和一些配置依賴項，不過沒關系，有強大的yum安裝，一切都不是問題。
1. 執行replicas命令
[jack@localhost ~]$ cluster/redis-trib.rb create --replicas 1 192.168.161.133:6379 192.168.161.133:6380 192.168.161.133:6381 192.168.161.133:6382 192.168.161.133:6383 192.168.161.133:6384
/usr/bin/env: ruby: No such file or directory
[jack@localhost ~]$
可以看到ruby是沒有安裝的，所以下一步我們要安裝ruby了。。。
2. 安裝ruby 【一定要是管理員權限哦】
[jack@localhost ~]$ sudo
usage: sudo [-D level] -h | -K | -k | -V
usage: sudo -v [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-u user
name|#uid]
usage: sudo -l[l] [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-U user
name] [-u user name|#uid] [-g groupname|#gid] [command]
usage: sudo [-AbEHknPS] [-r role] [-t type] [-C fd] [-D level] [-g
groupname|#gid] [-p prompt] [-u user name|#uid] [-g groupname|#gid]
[VAR=value] [-i|-s] [command>]
usage: sudo -e [-AknS] [-r role] [-t type] [-C fd] [-D level] [-g
groupname|#gid] [-p prompt] [-u user name|#uid] file ...
[jack@localhost ~]$ su
Password:
jacsu: incorrect password
[jack@localhost ~]$ yum install ruby
Loaded plugins: fastestmirror, refresh-packagekit, security
You need to be root to perform this command.
[jack@localhost ~]$ jack
bash: jack: command not found
[jack@localhost ~]$ su
Password:
[root@localhost jack]# yum install ruby
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirror.bit.edu.cn
* extras: mirror.bit.edu.cn
* updates: mirror.bit.edu.cn
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package ruby.x86_64 0:1.8.7.374-4.el6_6 will be installed
--> Processing Dependency: ruby-libs = 1.8.7.374-4.el6_6 for package: ruby-1.8.7.374-4.el6_6.x86_64
--> Processing Dependency: libruby.so.1.8()(64bit) for package: ruby-1.8.7.374-4.el6_6.x86_64
--> Running transaction check
---> Package ruby-libs.x86_64 0:1.8.7.374-4.el6_6 will be installed
--> Processing Dependency: libreadline.so.5()(64bit) for package: ruby-libs-1.8.7.374-4.el6_6.x86_64
--> Running transaction check
---> Package compat-readline5.x86_64 0:5.2-17.1.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
ruby x86_64 1.8.7.374-4.el6_6 base 538 k
Installing for dependencies:
compat-readline5 x86_64 5.2-17.1.el6 base 130 k
ruby-libs x86_64 1.8.7.374-4.el6_6 base 1.7 M
Transaction Summary
================================================================================
Install 3 Package(s)
Total download size: 2.3 M
Installed size: 7.8 M
Is this ok [y/N]: y
Downloading Packages:
(1/3): compat-readline5-5.2-17.1.el6.x86_64.rpm | 130 kB 00:00
(2/3): ruby-1.8.7.374-4.el6_6.x86_64.rpm | 538 kB 00:00
(3/3): ruby-libs-1.8.7.374-4.el6_6.x86_64.rpm | 1.7 MB 00:02
--------------------------------------------------------------------------------
Total 747 kB/s | 2.3 MB 00:03
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
Importing GPG key 0xC105B9DE:
Userid : CentOS-6 Key (CentOS 6 Official Signing Key) centos-6-key@centos.org>
Package: centos-release-6-5.el6.centos.11.1.x86_64 (@anaconda-CentOS-201311272149.x86_64/6.5)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : compat-readline5-5.2-17.1.el6.x86_64 1/3
Installing : ruby-libs-1.8.7.374-4.el6_6.x86_64 2/3
Installing : ruby-1.8.7.374-4.el6_6.x86_64 3/3
Verifying : compat-readline5-5.2-17.1.el6.x86_64 1/3
Verifying : ruby-libs-1.8.7.374-4.el6_6.x86_64 2/3
Verifying : ruby-1.8.7.374-4.el6_6.x86_64 3/3
Installed:
ruby.x86_64 0:1.8.7.374-4.el6_6
Dependency Installed:
compat-readline5.x86_64 0:5.2-17.1.el6 ruby-libs.x86_64 0:1.8.7.374-4.el6_6
Complete!
[root@localhost jack]#
3. 安裝rubygems
接著我們再次運行 replicas命令，看看會怎么樣。。。
[root@localhost jack]# cluster/redis-trib.rb create --replicas 1 192.168.161.133:6379 192.168.161.133:6380 192.168.161.133:6381 192.168.161.133:6382 192.168.161.133:6383 192.168.161.133:6384
cluster/redis-trib.rb:24:in `require': no such file to load -- rubygems (LoadError)
from cluster/redis-trib.rb:24
[root@localhost jack]#
結果苦逼了，還是報錯，看提示貌似是少了一個rubygems，這次我們還是通過yum安裝。
[root@localhost jack]# yum install -y rubygems
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirror.bit.edu.cn
* extras: mirror.bit.edu.cn
* updates: mirror.bit.edu.cn
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package rubygems.noarch 0:1.3.7-5.el6 will be installed
--> Processing Dependency: ruby-rdoc for package: rubygems-1.3.7-5.el6.noarch
--> Running transaction check
---> Package ruby-rdoc.x86_64 0:1.8.7.374-4.el6_6 will be installed
--> Processing Dependency: ruby-irb = 1.8.7.374-4.el6_6 for package: ruby-rdoc-1.8.7.374-4.el6_6.x86_64
--> Running transaction check
---> Package ruby-irb.x86_64 0:1.8.7.374-4.el6_6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
rubygems noarch 1.3.7-5.el6 base 207 k
Installing for dependencies:
ruby-irb x86_64 1.8.7.374-4.el6_6 base 317 k
ruby-rdoc x86_64 1.8.7.374-4.el6_6 base 381 k
Transaction Summary
================================================================================
Install 3 Package(s)
Total download size: 905 k
Installed size: 3.0 M
Downloading Packages:
(1/3): ruby-irb-1.8.7.374-4.el6_6.x86_64.rpm | 317 kB 00:00
(2/3): ruby-rdoc-1.8.7.374-4.el6_6.x86_64.rpm | 381 kB 00:00
(3/3): rubygems-1.3.7-5.el6.noarch.rpm | 207 kB 00:00
--------------------------------------------------------------------------------
Total 625 kB/s | 905 kB 00:01
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : ruby-irb-1.8.7.374-4.el6_6.x86_64 1/3
Installing : ruby-rdoc-1.8.7.374-4.el6_6.x86_64 2/3
Installing : rubygems-1.3.7-5.el6.noarch 3/3
Verifying : ruby-rdoc-1.8.7.374-4.el6_6.x86_64 1/3
Verifying : ruby-irb-1.8.7.374-4.el6_6.x86_64 2/3
Verifying : rubygems-1.3.7-5.el6.noarch 3/3
Installed:
rubygems.noarch 0:1.3.7-5.el6
Dependency Installed:
ruby-irb.x86_64 0:1.8.7.374-4.el6_6 ruby-rdoc.x86_64 0:1.8.7.374-4.el6_6
Complete!
[root@localhost jack]#
4. 安裝redis驅動
還是繼續不死心，我們繼續運行replicas命令命令。
[root@localhost jack]# cluster/redis-trib.rb create --replicas 1 192.168.161.133:6379 192.168.161.133:6380 192.168.161.133:6381 192.168.161.133:6382 192.168.161.133:6383 192.168.161.133:6384
/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 cluster/redis-trib.rb:25
[root@localhost jack]#
還是有問題，這次貌似是一個gem_original_require沒有安裝，當然這個一般是說ruby版本太老了，所以現在親要么升級ruby版本，要么直接安裝ruby的redis驅動。
[root@localhost jack]# gem install redis
Successfully installed redis-3.3.0
1 gem installed
Installing ri documentation for redis-3.3.0...
Installing RDoc documentation for redis-3.3.0...
6. 運行replicas命令
終于貌似所有的依賴我們都解決了，接下來就可以真的執行了。
[root@localhost jack]# cluster/redis-trib.rb create --replicas 1 192.168.161.133:6379 192.168.161.133:6380 192.168.161.133:6381 192.168.161.133:6382 192.168.161.133:6383 192.168.161.133:6384
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.161.133:6379
192.168.161.133:6380
192.168.161.133:6381
Adding replica 192.168.161.133:6382 to 192.168.161.133:6379
Adding replica 192.168.161.133:6383 to 192.168.161.133:6380
Adding replica 192.168.161.133:6384 to 192.168.161.133:6381
M: fdae457e803e2e04a7c549c69b44a2beefdae3bc 192.168.161.133:6379
slots:0-5460 (5461 slots) master
M: 74285cee0fa65e64b443ecc630e447a8a65ee9f8 192.168.161.133:6380
slots:5461-10922 (5462 slots) master
M: 14ed067a1b85044325d5800fa8479a6b4e41a10c 192.168.161.133:6381
slots:10923-16383 (5461 slots) master
S: c50b1ff1fe3a00b16703f3b5705d2dafe046240b 192.168.161.133:6382
replicates fdae457e803e2e04a7c549c69b44a2beefdae3bc
S: 8f7bd92f7ffb48e327820693a5820b5be7ea5556 192.168.161.133:6383
replicates 74285cee0fa65e64b443ecc630e447a8a65ee9f8
S: 4a85ed078b4c99afad7f3a9a8df09082c681a649 192.168.161.133:6384
replicates 14ed067a1b85044325d5800fa8479a6b4e41a10c
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 192.168.161.133:6379)
M: fdae457e803e2e04a7c549c69b44a2beefdae3bc 192.168.161.133:6379
slots:0-5460 (5461 slots) master
M: 74285cee0fa65e64b443ecc630e447a8a65ee9f8 192.168.161.133:6380
slots:5461-10922 (5462 slots) master
M: 14ed067a1b85044325d5800fa8479a6b4e41a10c 192.168.161.133:6381
slots:10923-16383 (5461 slots) master
M: c50b1ff1fe3a00b16703f3b5705d2dafe046240b 192.168.161.133:6382
slots: (0 slots) master
replicates fdae457e803e2e04a7c549c69b44a2beefdae3bc
M: 8f7bd92f7ffb48e327820693a5820b5be7ea5556 192.168.161.133:6383
slots: (0 slots) master
replicates 74285cee0fa65e64b443ecc630e447a8a65ee9f8
M: 4a85ed078b4c99afad7f3a9a8df09082c681a649 192.168.161.133:6384
slots: (0 slots) master
replicates 14ed067a1b85044325d5800fa8479a6b4e41a10c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@localhost jack]#
從上面可以看到，trib程序告知我們是否用 6379，6380，6381 作為主， 6382，6383，6384作為從。。然后我就恩準了。。就這樣我們的集群就創建好了
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