普通的Web开发,常用的模式就是用户登录之后,登录状态信息保存在Session中,用户一些常用的热数据保存在文件缓存中,用户上传的附件信息保存在Web服务器的某个目录上。这种方式对于一般的Web应用,使用很方便,完全能够胜任。但是对于高并发的企业级网站,就应付不了了。需要采用Web集群实现负载均衡。
使用Web集群方式部署之后,首要调整的就是用户状态信息与附件信息。用户状态不能再保存到Session中,缓存也不能用本地Web服务器的文件缓存,以及附件,也不能保存在Web服务器上了。因为要保证集群里面的各个Web服务器,状态完全一致。因此,需要将用户状态、缓存等保存到专用的缓存服务器,比如Memcache。附件需要保存到云存储中,比如七牛云存储、阿里云存储、腾讯云存储等。
本文以ThinkPHP开发框架为例,说明如何设置,能够将Session、缓存等保存到Memcache缓存服务器上。
下载缓存的Memcache处理类,放到Thinkphp\Extend\Driver\Cache目录中;下载Session的Memcache处理类,放到Thinkphp\Extend\Driver\Session目录中,如下图所示:
修改配置文件,调整Session与缓存,都记录到Memcache服务器上。打开ThinkPHP\Conf\convention.PHP
<http://lib.csdn.net/base/php>,增加配置项:
[php] view plain <http://blog.csdn.net/cuizm/article/details/51821829#> copy
<http://blog.csdn.net/cuizm/article/details/51821829#>
* /* Memcache缓存设置 */
* 'MEMCACHE_HOST' => '192.168.202.20',
* 'MEMCACHE_PORT' => 11211,
修改数据缓存为Memcache:
[php] view plain <http://blog.csdn.net/cuizm/article/details/51821829#> copy
<http://blog.csdn.net/cuizm/article/details/51821829#>
* 'DATA_CACHE_TYPE' => 'Memcache', 修改Session为Memcache:
[php] view plain <http://blog.csdn.net/cuizm/article/details/51821829#> copy
<http://blog.csdn.net/cuizm/article/details/51821829#>
* 'SESSION_TYPE' => 'Memcache',
如下图所示:
因为云存储各类比较多,附件存储到云存储上,就不再赘述,参数各云存储提供的sdk即可。经过以上修改,就可以将Web服务器进行分布式部署了。
附件1:CacheMemcache.class.php <http://lib.csdn.net/base/php>
[php] view plain <http://blog.csdn.net/cuizm/article/details/51821829#> copy
<http://blog.csdn.net/cuizm/article/details/51821829#>
* <?php
* // +----------------------------------------------------------------------
* // | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
* // +----------------------------------------------------------------------
* // | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
* // +----------------------------------------------------------------------
* // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
* // +----------------------------------------------------------------------
* // | Author: liu21st <[email protected]>
* // +----------------------------------------------------------------------
*
* defined('THINK_PATH') or exit();
* /**
* * Memcache缓存驱动
* * @category Extend
* * @package Extend
* * @subpackage Driver.Cache
* * @author liu21st <[email protected]>
* */
* class CacheMemcache extends Cache {
*
* /**
* * 架构函数
* * @param array $options 缓存参数
* * @access public
* */
* function __construct($options=array()) {
* if ( !extension_loaded('memcache') ) {
* throw_exception(L('_NOT_SUPPERT_').':memcache');
* }
*
* $options = array_merge(array (
* 'host' => C('MEMCACHE_HOST') ? C('MEMCACHE_HOST') :
'127.0.0.1',
* 'port' => C('MEMCACHE_PORT') ? C('MEMCACHE_PORT'
) : 11211,
* 'timeout' => C('DATA_CACHE_TIMEOUT') ? C(
'DATA_CACHE_TIMEOUT') : false,
* 'persistent' => false,
* ),$options);
*
* $this->options = $options;
* $this->options['expire'] = isset($options['expire'])? $options[
'expire'] : C('DATA_CACHE_TIME');
* $this->options['prefix'] = isset($options['prefix'])? $options[
'prefix'] : C('DATA_CACHE_PREFIX');
* $this->options['length'] = isset($options['length'])? $options[
'length'] : 0;
* $func = $options['persistent'] ? 'pconnect' :
'connect';
* $this->handler = new Memcache;
* $options['timeout'] === false ?
* $this->handler->$func($options['host'], $options['port']) :
* $this->handler->$func($options['host'], $options['port'],
$options['timeout']);
* }
*
* /**
* * 读取缓存
* * @access public
* * @param string $name 缓存变量名
* * @return mixed
* */
* public function get($name) {
* N('cache_read',1);
* return $this->handler->get($this->options['prefix'].$name);
* }
*
* /**
* * 写入缓存
* * @access public
* * @param string $name 缓存变量名
* * @param mixed $value 存储数据
* * @param integer $expire 有效时间(秒)
* * @return boolen
* */
* public function set($name, $value, $expire = null) {
* N('cache_write',1);
* if(is_null($expire)) {
* $expire = $this->options['expire'];
* }
* $name = $this->options['prefix'].$name;
* if($this->handler->set($name, $value, 0, $expire)) {
* if($this->options['length']>0) {
* // 记录缓存队列
* $this->queue($name);
* }
* return true;
* }
* return false;
* }
*
* /**
* * 删除缓存
* * @access public
* * @param string $name 缓存变量名
* * @return boolen
* */
* public function rm($name, $ttl = false) {
* $name = $this->options['prefix'].$name;
* return $ttl === false ?
* $this->handler->delete($name) :
* $this->handler->delete($name, $ttl);
* }
*
* /**
* * 清除缓存
* * @access public
* * @return boolen
* */
* public function clear() {
* return $this->handler->flush();
* }
* }
附件2:SessionMemcache.class.php
[php] view plain <http://blog.csdn.net/cuizm/article/details/51821829#> copy
<http://blog.csdn.net/cuizm/article/details/51821829#>
* <?php
* // +----------------------------------------------------------------------
* // |
* // +----------------------------------------------------------------------
* // | Copyright (c) 2013-
* // +----------------------------------------------------------------------
* // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
* // +----------------------------------------------------------------------
* // | Author: richievoe <[email protected]>
* // +----------------------------------------------------------------------
* /**
* * 自定义Memcache来保存session
* */
* Class SessionMemcache{
* //memcache对象
* private $mem;
* //SESSION有效时间
* private $expire;
* //外部调用的函数
* public function execute(){
* session_set_save_handler(
* array(&$this,'open'),
* array(&$this,'close'),
* array(&$this,'read'),
* array(&$this,'write'),
* array(&$this,'destroy'),
* array(&$this,'gc')
* );
* }
* //连接memcached和初始化一些数据
* public function open($path,$name){
* $this->expire = C('SESSION_EXPIRE') ? C('SESSION_EXPIRE') :ini_get(
'session.gc_maxlifetime');
* $this->mem = new Memcache;
* return $this->mem->connect(C('MEMCACHE_HOST'), C('MEMCACHE_PORT'
));
* }
* //关闭memcache服务器
* public function close(){
* return $this->mem->close();
* }
* //读取数据
* public function read($id){
* $id = C('SESSION_PREFIX').$id;
* $data = $this->mem->get($id);
* return $data ? $data :'';
* }
* //存入数据
* public function write($id,$data){
* $id = C('SESSION_PREFIX').$id;
* //$data = addslashes($data);
* return $this->mem->set($id,$data,0,$this->expire);
* }
* //销毁数据
* public function destroy($id){
* $id = C('SESSION_PREFIX').$id;
* return $this->mem->delete($id);
* }
* //垃圾销毁
* public function gc(){
* return true;
* }
* }
* ?>
热门工具 换一换