實驗主機3臺：
server11：redis快取伺服器
server12：mysql伺服器:client
serever13：ngnx+php-fpm,gearmand server,worker
server11：

首先安裝redis伺服器

server13：

rpm包安裝nginx+php-fpm

vim /etc/php.ini
946 date.timezone = Asia/Shanghai

vim  /etc/php-fpm.d/www.conf
#修改使用者和組為nginx，原因是檢視/etc/nginx/nginx.conf檔案中記錄了nginx預設以nginx使用者身份啟動
 

39 user = nginx
40 ; RPM: Keep a group allowed to write in log dir.
41 group = nginx

vim /etc/nginx/conf.d/default.conf 
8     location / {
9         root   /usr/share/nginx/html; 10         index  index.php index.html index.htm;        #新增php首頁
 11     }


30     location ~ \.php$ {
 31         root           html;
 32
 
         fastcgi_pass   127.0.0.1:9000;
 33         fastcgi_index  index.php;
 34         fastcgi_param  SCRIPT_FILENAME  /usr/share/nginx/html$fastcgi_script    _name;
 35         include        fastcgi_params;
 36     }

 yum install -y unzip  
 unzip phpredis-master.zip
 cd phpredis-master         
 yum install -y
 
 gcc
 phpize
./configure 
 make & make install 
 #此時可以生成redis.so，即redis動態連線庫
 cd /usr/lib64/php/modules/    #預設在此目錄下



cd /usr/share/nginx/html/
vim test.php
<?php
        $redis = new Redis();
        $redis->connect('172.25.92.11',6379) or die ("could net connect redis server");       #指定redis伺服器
  #      $query = "select * from test limit 9";
        $query = "select * from test";
        for ($key = 1; $key < 10; $key++)
        {
                if (!$redis->get($key))
                {
                        $connect = mysql_connect('172.25.92.12','redis','westos');  #設定登陸後端mysql伺服器的使用者和密碼
                        mysql_select_db(test);
                        $result = mysql_query($query);
                        //如果沒有找到$key,就將該查詢sql的結果快取到redis
                        while ($row = mysql_fetch_assoc($result))
                        {
                                $redis->set($row['id'],$row['name']);
                        }
                        $myserver = 'mysql';
                        break;
                }
                else
                {
                        $myserver = "redis";
                        $data[$key] = $redis->get($key);
                }
        }


cd /etc/php.d/
cp mysql.ini redis.ini
vim redis.ini
extension=redis.so                 #新增redis快取庫，php預設會讀取/etc/php.d/下的所有.ini結尾的檔案 

 /etc/init.d/nginx start
/etc/init.d/php-fpm start

server12:

yum install -y mysql-sesrver
/etc/init.d/mysqld start
mysql_secure_installation 
mysql -phello
mysql> create database test;
Query OK, 1 row affected (0.00 sec)
mysql> grant all on test.* to [email protected]'%' identified by 'westos';   #根據test.php檔案內容授權使用者
Query OK, 0 rows affected (0.00 sec)

mysql < test.sql -phello

#test.sql檔案內容  

[[email protected] ~]# cat test.sql 
use test;
CREATE TABLE `test` (`id` int(7) NOT NULL AUTO_INCREMENT, `name` char(8) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `test` VALUES (1,'test1'),(2,'test2'),(3,'test3'),(4,'test4'),(5,'test5'),(6,'test6'),(7,'test7'),(8,'test8'),(9,'test9');

#DELIMITER $$
#CREATE TRIGGER datatoredis AFTER UPDATE ON test FOR EACH ROW BEGIN
#    SET @RECV=gman_do_background('syncToRedis', json_object(NEW.id as `id`, NEW.name as `name`)); 
#  END$$
#DELIMITER ;


mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from test;
+----+-------+
| id | name  |
+----+-------+
|  1 | test1 |
|  2 | test2 |
|  3 | test3 |
|  4 | test4 |
|  5 | test5 |
|  6 | test6 |
|  7 | test7 |
|  8 | test8 |
|  9 | test9 |
+----+-------+

測試：手動更新redis

瀏覽器：
172.25.92.13/test.php
會顯示test庫中的內容。
在server12上手動做資料庫更新：

mysql> update test set name='westos' where id=1;
Query OK, 1 row affected (0.10 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from test;
+----+--------+
| id | name   |
+----+--------+
|  1 | westos |
|  2 | test2  |
|  3 | test3  |
|  4 | test4  |
|  5 | test5  |
|  6 | test6  |
|  7 | test7  |
|  8 | test8  |
|  9 | test9  |
+----+--------+

在瀏覽器再次訪問時發現沒有變化，原因是因為redis快取的存在。
server11上：刪除id1的快取：

[[email protected] ~]# redis-cli 
127.0.0.1:6379> get 1
"test1"
127.0.0.1:6379> get 2
"test2"
127.0.0.1:6379> del 1
(integer) 1
127.0.0.1:6379> get 1
(nil)

再次在瀏覽器上訪問：

利用gearmand實現redis自動更新：

原理：msyql作為gearemand的客戶端（client），geaemand自身為server，php端為worker。
當mysql（client）由資料更新時，會觸發trigger，trigger會呼叫UDF（三個函式），將mysql更新的資料json化，併發給gearmand（保證4370埠開啟）。gearmand會將資料傳送個php服務端，同時php端會發送給redis（worker.php檔案中記錄了此行為）。php端要安裝gearmand（gearman-1.1.2.tgz）來生成gearmand.so，然後擴充套件到php中，建立php和gearmand的關聯。然後將worker.php程式執行在後端，一旦資料庫端由資料更新，gearmand會發送給redis，同時會發送給php端。每次資料庫更新都會及時的更新到php端，不會因為redis快取導致客戶端訪問的資料不變的情況，既有快取的功能，也有實時更新的效果。
server13上：

yum install gearmand-1.1.8-2.el6.x86_64.rpm libgearman-1.1.8-2.el6.x86_64.rpm
/etc/init.d/gearmand start
netstat -antlp             #檢視gearmand開啟的埠4730
tcp        0      0 0.0.0.0:4730                0.0.0.0:*                   LISTEN      3601/gearmand   

server12:

yum install mysql-devel           #安裝mysql的開發包
yum install -y unzip
unzip lib_mysqludf_json-master.zip 
cd lib_mysqludf_json-master
gcc $(mysql_config --cflags) -shared -fPIC -o lib_mysqludf_json.so lib_mysqludf_json.c        #編譯生成lib_mysqludf_json.so，可以使用ls檢視

cp lib_mysqludf_json.so /usr/lib64/mysql/plugin/
cd /usr/lib64/mysql/plugin/

mysql -phello
mysql> CREATE FUNCTION json_object RETURNS STRING SONAME 'lib_mysqludf_json.so';           #由mysqludf_json.so生成json_object這個UDF函式，此函式用於將mysql資料對映為json格式

tar zxf gearman-mysql-udf-0.6.tar.gz 
cd gearman-mysql-udf-0.6
yum install -y libgearman-* libevent-*
./configure --libdir=/usr/lib64/mysql/plugin/
make
make install
cd /usr/lib64/mysql/plugin/
ls       #可以看到生成libgearman_mysql_udf.so.0.0.0這個動態庫，用於建立另外兩個函式。

mysql -phello
mysql> CREATE FUNCTION gman_do_background RETURNS STRING SONAME 'libgearman_mysql_udf.so';         #生成gman_do_background這個函式，此函式用於將json資料傳送給gearmand
mysql> CREATE FUNCTION gman_servers_set RETURNS STRING SONAME 'libgearman_mysql_udf.so';   #生成gman_servers函式，此函式用於指定gearmand的ip和埠
Query OK, 0 rows affected (0.00 sec)

mysql> select * from mysql.func;      #檢視關於沒有mysql的函式
+--------------------+-----+-------------------------+----------+
| name               | ret | dl                      | type     |
+--------------------+-----+-------------------------+----------+
| json_object        |   0 | lib_mysqludf_json.so    | function |
| gman_do_background |   0 | libgearman_mysql_udf.so | function |
| gman_servers_set   |   0 | libgearman_mysql_udf.so | function |
+--------------------+-----+-------------------------+----------+
3 rows in set (0.00 sec)

mysql> SELECT gman_servers_set('172.25.92.13:4730');  #檢視gearmand
+---------------------------------------+
| gman_servers_set('172.25.92.13:4730') |
+---------------------------------------+
| 172.25.92.13:4730                     |
+---------------------------------------+
 #重新匯入資料庫，啟動觸發條件，即mysql何時將資料傳送給gearmnd
 vim test.sql    #去掉觸發條件的註釋

use test;
#CREATE TABLE `test` (`id` int(7) NOT NULL AUTO_INCREMENT, `name` char(8) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;
#INSERT INTO `test` VALUES (1,'test1'),(2,'test2'),(3,'test3'),(4,'test4'),(5,'test5'),(6,'test6'),(7,'test7'),(8,'test8'),(9,'test9');

DELIMITER $$
CREATE TRIGGER datatoredis AFTER UPDATE ON test FOR EACH ROW BEGIN
    SET @RECV=gman_do_background('syncToRedis', json_object(NEW.id as `id`, NEW.name as `name`));
  END$$
DELIMITER ;
~                                                                       
~       

mysql < test.sql -phello
mysql -phello
mysql> SHOW TRIGGERS FROM test;           #檢視觸發條件

server13上：

vim worker.php      #此程式用於指出gearmand和redis的關聯,用php語言寫成

<?php
$worker = new GearmanWorker();
$worker->addServer();
$worker->addFunction('syncToRedis', 'syncToRedis');

$redis = new Redis();
$redis->connect('172.25.92.11', 6379);        #指出redis的位置

while($worker->work());
function syncToRedis($job)
{
        global $redis;
        $workString = $job->workload();
        $work = json_decode($workString);
        if(!isset($work->id)){
                return false;
        }
        $redis->set($work->id, $work->name);
}
?>


tar zxf gearman-1.1.2.tgz
cd gearman-1.1.2
phpize
yum install -y libgearman-devel-1.1.8-2.el6.x86_64.rpm libevent-1.4.13-4.el6.x86_64.rpm libevent-devel-1.4.13-4.el6.x86_64.rpm libevent-doc-1.4.13-4.el6.noarch.rpm libevent-headers-1.4.13-4.el6.noarch.rpm re2c-0.13.5-1.el6.x86_64.rpm 
cd gearman-1.1.2
./configure 
make
make install
cd /etc/php.d/
cp redis.ini gearman.ini    
vim gearman.ini                 #指定gearmand擴充套件的ini檔案
cd /usr/lib64/php/modules/      #次目錄下可以看見gearman.so
vim gearman.ini
extension=gearman.so
/etc/init.d/php-fpm reload
cp worker.php /usr/local/       #將第三方程式放在/usr/local下
cd /usr/local/
nohup php worker.php &          #後臺執行worker
ps ax                           #檢視程序

測試：此時在資料庫再次更新資料時，在redis以及瀏覽器上訪問都可以直接變更。