上一弹中我们规划并搭建了基本的架构组成,当然此架构存在诸多问题,我们在接下来的章节中将不断
完善其功能特性,使之成为实至名归的百万PV架构站点 
首先来对上一弹架构做基本的ab 并发100, 总量2000的测试,让我们对站点性能有所熟知,之后在之前的功能上我们添加多道
缓存对性能进行提升. (ps: 测试机器均为虚拟机环境 , 大约性能比主流服务器低 2.5 - 3.5 倍 , 测试参
数可做此对比评估)
按照规划,我们在salve3.king.com中添加两实例的varnish,在slave4.king.com中添加memcache实现
session信息共享. 本期架构图如下,可与第一弹做对比学习 日均百万PV架构第一弹(基本架构搭建)
操作:
i) 安装配置varnish实现静态内容缓存
1. 准备如下文件(slave3.king.com) varnish-3.0.4-1.el6.x86_64.rpm varnish-docs-3.0.4-1.el6.x86_64.rpm varnish-libs-3.0.4-1.el6.x86_64.rpm varnish-libs-devel-3.0.4-1.el6.x86_64.rpm rpm -ivh varnish*.rpm
2. 配置varnish(slave3.king.com)
vim /etc/sysconfig/varnish
VARNISH_STORAGE="malloc,100M"
#
vim /etc/varnish/default.vcl
backend imgs1 {
.host = "imgs1.king.com";
.port = "80";
}
#
backend imgs2 {
.host = "imgs2.king.com";
.port = "80";
}
#
sub vcl_recv {
# 由于前端的haproxy已经做了负载均衡,这里直接按请求原路径处理
if (req.http.host == "imgs1.king.com") {
set req.backend = imgs1;
} else {
set req.backend = imgs2;
}
return(lookup);
}
#
sub vcl_deliver {
set resp.http.X-Age = resp.http.Age;
unset resp.http.Age;
#
if (obj.hits > 0) {
set resp.http.X-Cache = "HIT via " + server.hostname;
} else {
set resp.http.X-Cache = "MISS";
}
}3. 配置haproxy将流量转向varnish(slave1.king.com , slave2.king.com)
vim /etc/haproxy/haproxy.cfg
backend img_servers
balance roundrobin
server imgsrv1 imgs1.king.com:6081 check maxconn 4000
server imgsrv2 imgs2.king.com:6081 check maxconn 40004. 更改文本内容的设置 如上过程,也可以使用同一个varnish(略)
加入缓存后,站点测试
加入缓存后的ab 并发100 总量2000 测试
ii) 安装配置memcache实现session共享
1. 安装memcache(slave4.king.com)
################## 1. 解决依赖 ####################
tar xf libevent-2.0.21-stable.tar.gz
cd libevent-2.0.21-stable
./configure --prefix=/usr/local/libevent
make && make install
echo "/usr/local/libevent/lib" > /etc/ld.so.conf.d/libevent.conf
ldconfig
################## 2. 安装memcached ####################
tar xf memcached-1.4.15.tar.gz
cd memcached-1.4.15
./configure --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent
make && make install
###### 3. 提供启动脚本(/etc/init.d/memcached) ###########
#!/bin/bash
#
# Init file for memcached
#
# chkconfig: - 86 14
# description: Distributed memory caching daemon
#
# processname: memcached
# config: /etc/sysconfig/memcached
#
. /etc/rc.d/init.d/functions
#
## Default variables
PORT="11211"
USER="nobody"
MAXCONN="1024"
CACHESIZE="64"
#
RETVAL=0
prog="/usr/local/memcached/bin/memcached"
desc="Distributed memory caching"
lockfile="/var/lock/subsys/memcached"
#
start() {
echo -n $"Starting $desc (memcached): "
daemon $prog -d -p $PORT -u $USER -c $MAXCONN -m $CACHESIZE
RETVAL=$?
[ $RETVAL -eq 0 ] && success && touch $lockfile || failure
echo
return $RETVAL
}
#
stop() {
echo -n $"Shutting down $desc (memcached): "
killproc $prog
RETVAL=$?
[ $RETVAL -eq 0 ] && success && rm -f $lockfile || failure
echo
return $RETVAL
}
#
restart() {
stop
start
}
#
reload() {
echo -n $"Reloading $desc ($prog): "
killproc $prog -HUP
RETVAL=$?
[ $RETVAL -eq 0 ] && success || failure
echo
return $RETVAL
}
#
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
restart
;;
condrestart)
[ -e $lockfile ] && restart
RETVAL=$?
;;
reload)
reload
;;
status)
status $prog
RETVAL=$?
;;
*)
echo $"Usage: $0 {start|stop|restart|condrestart|status}"
RETVAL=1
esac
#
exit $RETVAL
################# 4. 配置脚本 ####################
chmod +x /etc/init.d/memcached
chkconfig --add memcached
service memcached start2. 配置php支持memcache(slave3.king.com , slave4.king.com) tar xf memcache-2.2.7.tgz cd memcache-2.2.7 /usr/local/php/bin/phpize ./configure --enable-memcache --with-php-config=/usr/local/php/bin/php-config make && make install # 安装结束时，会出现类似如下行, 将后半句复制 Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20100525/memcache.so # 编辑/etc/php.ini，在“dynamically loaded extension”相关的位置添加如下一行来载入memcache扩展： extension=/usr/local/php/lib/php/extensions/no-debug-non-zts-20100525/memcache.so
3. 实现session共享(slave3.king.com , slave4.king.com) 编辑php.ini文件，确保如下两个参数的值分别如下所示： session.save_handler = memcache session.save_path = "tcp://172.16.43.4:11211?persistent=1&weight=1&timeout=1&retry_interval=15" 最后重启 slave3.king.com , slave4.king.com 的 php-fpm 服务
4. 测试
新建php页面 /nfsshared/html/setsess.php，为客户端设置启用session：
<?php
session_start();
if (!isset($_SESSION[‘www.king.com‘])) {
$_SESSION[‘www.king.com‘] = time();
}
print $_SESSION[‘www.king.com‘];
print "<br><br>";
print "Session ID: " . session_id();
?>
#
新建php页面 /nfsshared/html/showsess.php，获取当前用户的会话ID：
<?php
session_start();
$memcache_obj = new Memcache;
$memcache_obj->connect(‘172.16.43.4‘, 11211);
$mysess=session_id();
var_dump($memcache_obj->get($mysess));
$memcache_obj->close();
?>加入memcache后, 反复刷新www.king.com在dns轮询,haproxy的调度算法下, 存储在memcache
中的session没有改变,证明session共享成功
本文出自 “Apprentice” 博客，请务必保留此出处http://apprentice.blog.51cto.com/2214645/1408690
日均百万PV架构第二弹(缓存时代来临),布布扣,bubuko.com
原文：http://apprentice.blog.51cto.com/2214645/1408690