MySQL与Redis数据库结合(二)——基于lnmp配置gearman实现Redis和MySQL数据同步（lnmp+redis+mysql+gearman）

一、基于lnmp配置gearman实现Redis和MySQL数据同步

我们本篇博客解决的就是：如何将mysql端修改的数据及时更新到rdis端，实现数据同步。

1、在server3上，解压lib_mysqludf_json-master.zip

[root@server3 ~]# yum install unzip -y
[root@server3 ~]# ls
[root@server3 ~]# unzip lib_mysqludf_json-master.zip  

2、安装gcc 和mariadb-devel，mariadb-devel和gcc不能同时安装，同时安装只会安装其中一个。

[root@server3 ~]# cd lib_mysqludf_json-master
[root@server3 lib_mysqludf_json-master]# yum install gcc -y
[root@server3 lib_mysqludf_json-master]# yum install mariadb-devel -y

3、gcc进行编译

[root@server3 lib_mysqludf_json-master]# gcc $(mysql_config --cflags) -shared -fPIC -o lib_mysqludf_json.so lib_mysqludf_json.c

4、将lib_mysqludf_json-master/lib_mysqludf_json.so模块拷贝到/usr/lib64/mysql/plugin/插件目录下

cp lib_mysqludf_json-master/lib_mysqludf_json.so /usr/lib64/mysql/plugin/

5、登陆数据库，查看插件目录

[root@server3 lib_mysqludf_json-master]# mysql -uroot -predhat
MariaDB [(none)]> show global variables like 'plugin_dir';

6、注册udf函数，并查看。

MariaDB [(none)]> create FUNCTION json_object returns string soname 'lib_mysqludf_json.so';
MariaDB [(none)]> select * from mysql.func;

7、安装libgearman安装包，并安装管理gearman的分布式队列插件，进行编译和安装

[root@server3 ~]# yum install libgearman-* libevent-devel-2.0.21-4.el7.x86_64.rpm  -y
[root@server3 ~]# tar zxf gearman-mysql-udf-0.6.tar.gz 
[root@server3 ~]# cd gearman-mysql-udf-0.6
[root@server3 gearman-mysql-udf-0.6]# ls
[root@server3 gearman-mysql-udf-0.6]# ./configure -libdir=/usr/lib64/mysql/plugin/ --with-mysql
[root@server3 gearman-mysql-udf-0.6]# make && make install

8、再次注册两个udf函数

MariaDB [(none)]> CREATE FUNCTION gman_do_background RETURNS STRING SONAME 'libgearman_mysql_udf.so';
MariaDB [(none)]> CREATE FUNCTION gman_servers_set RETURNS STRING SONAME 'libgearman_mysql_udf.so';
MariaDB [(none)]> select * from mysql.func;

9、指定gearman的服务信息

MariaDB [(none)]> select gman_servers_set('172.25.2.1:4730');

10、编写mysql触发器脚本test.sql，并导入test数据库

[root@server3 ~]# vim test.sql 
use test;
##注释掉创建表的两行
#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 ;

[root@server3 ~]# mysql -predhat < test.sql 
[root@server3 ~]# mysql -uroot -predhat 

11、查看触发器

MariaDB [(none)]> SHOW TRIGGERS FROM test;

12、在server1上（gman的worker端），开启gearmand服务并查看其端口号4730是否开启

[root@server1 ~]# systemctl start gearmand
[root@server1 ~]# netstat -tnlp

13、编写worker.php脚本，并放到/usr/local目录下

[root@server1 ~]# vim worker.php

<?php
$worker = new GearmanWorker();
$worker->addServer();
$worker->addFunction('syncToRedis', 'syncToRedis');
 
$redis = new Redis();
$redis->connect('172.25.2.2', 6379);
 
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);
}
?>

[root@server1 ~]# cp worker.php /usr/lcoal/

14、在后台运行worker

[root@server1 ~]# nohup php /usr/local/worker.php &> /dev/null &

15、测试，在server3更新数据并查看（注意：其中id=1的因为是之前更改的，所以不生效）

MariaDB [(none)]> use test;
MariaDB [test]> update test set name='ranran' where id=2;
MariaDB [test]> select * from test;
MariaDB [test]> update test set name='qiuqiu' where id=3;

在server2尝试获取，发生改变

[root@server2 redis-5.0.3]# redis-cli
127.0.0.1:6379> get 2
127.0.0.1:6379> get 3

在浏览器中查看，看到发生改变

此时，就实现了Redis和MySQL数据同步了。