memcache 安装部署

1.环境配置：

192.168.239.140 ：memcache
192.168.239.141：web
192.168.239.142：mysql

2.进行时间同步：

yum install ntp ntpdate
ntpdate cn.pool.ntp.org

3.关闭防火墙：

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld
[root@localhost ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
[root@localhost ~]# setenforce 0

前提条件：
rpm -e mariadb-libs postfix

4.在web端服务器配置：

yum install mysql-community-libs-compat-8.0.16-2.el7.x86_64.rpm 

yum install http  php php-gb php-mysql php-memcache

systemctl restart httpd
systemctl enable httpd
systemctl restart httpd
systemctl enable mysql

5.在MySQL服务端创建用户

create user 'memcache'@'%' identified by 'WANGYUFENG@mysql123';
alter user 'memcache'@'%' identified with mysql_native_password by 'WANGYUFENG@mysql123';
flush privileges;

6.在web服务端测试http功能：

vim /var/www/html/index.html
this is a test 

去百度开启无痕浏览模式测试

7.在web服务端测试php连接功能：

<?php
phpinfo();
?>

~
8.在web服务端测试MySQL

<?php
$link=mysql_connect('192.168.239.142','superadmin','WANGYUFENG@mysql123');
if($link) echo "<h1>Success!!</h1>";
else echo "Fail!!";
mysql_close();
?>

9.在memcache端进行软件下载安装：

libevent安装：
wget http://monkey.org/~provos/libevent-1.4.14b-stable.tar.gz
tar zxvf libevent-1.4.14b-stable.tar.gz 
yum install make gcc gcc-c++
cd libevent-1.4.14b-stable
 ./configure --prefix=/usr/local/libevent/
make
make install

memcache安装：
wget https://memcached.org/files/memcached-1.5.16.tar.gz
tar -zxvf memcached-1.5.16.tar.gz 
cd memcached-1.5.16
./configure --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent/
make
make install

启动：

cd /etc/rc.d/init.d/
/usr/local/memcached/bin/memcached -d -l 127.0.0.1 -p 11211 -u root -m 64 -c 1024 -P /var/run/memcached.pid
-d：启动一个守护进程
-l：监听的服务器IP地址
-p：是设置memcache的TCP监听的端口，最好是1024以上的端口
-u：是运行memcache的用户，如果当前为root的话，需要使用此参数指定用户
-m：是分配给memcache使用的内存数量，单位是MB，默认是64MB
-c：选项是最大与模型的最大连接数，默认是1024
-P：是设置保存memcache的pid文件
-M：return error on memory exhausted(rather than removing items)
-f：chunk size growth factor (default : 1.25)
-I override the size of each sllab page. Adjusts max item size(1.4.2版本新增)
也可以启动多个守护进程，但是端口不能重复

<?php
$memcache = new Memcache;
$memcache->connect('192.168.239.140',11211) or die ("could not connect");
$version = $memcache->getVersion();
echo "Server's version: ".$version."<br/>";
$tmp_object = new stdClass;
$tmp_object->str_attr = 'test';
$tmp_object->int_attr = 123;
$memcache->set('key', $tmp_object,false,10) or die ("Failed to save data at the server");
echo "Store data in the cache(data will expire in 10 seconds)<br/>";
$get_result = $memcache->get('key');
echo "Data from the cache:<br/>";
var_dump($get_result);
?>

测试成功结果如下：

Server's version: 1.5.16
Store data in the cache(data will expire in 10 seconds)
Data from the cache:
object(stdClass)#3 (2) { ["str_attr"]=> string(4) "test" ["int_attr"]=> int(123) }

在web端配置session：

vim /etc/php.ini
session.save_handler = memcache
session.save_path = "tcp://192.168.239.141:11211?persistent=1&weight=1&timeout=1&retry_interval=15"

测试memcache的可用性：

<?php
session_start();
if (!isset($——SESSION['session_time']))
{
$_SESSION['session_time']=time();
}
echo "session_time:".$_SESSION['session_time']."<br/>";
echo "now_time:".time()."<br/>";
echo "session_id:".session_id()."<br/>";
?>

在MySQL端创建测试数据库：

create user ‘user’@‘%’ identified by ‘WANGYUFENG@mysql123’;

create database testab1;

use testab1;

create table test1(
id int not null auto_increment,
name int not null,
primary key(id))
innodb=engine

测试memcache存储数据库

<?php
$memcachehost='192.168.239.140';
$memcacheport=11211;
$memcachelife=60;
$memcache=new Memcache;
$memcache->connect($memcachehost,$memcacheport) or die ("Could not connect");
$query="select * from test1 limit 10";
$key=md5($query);
if(!$memcache->get($key))
{
$conn=mysql_connect("192.168.239.142","user","WANGYUFENG@mysql123");
mysql_select_db(testab1);
$result=mysql_query($query);
while($row=mysql_fetch_assoc($result))
{
$arr[]=$row;
}
$f='mysql';
$memcache->add($key,serialize($arr),0,30);
$data=$arr;
}
else{
$f='memcache';
$data_mem=$memcache->get($key);
$data=unserialize($data_mem);
}
echo $f;
echo "<br/>";
echo "$key";
echo "<br/>";
//print_r($data);
foreach($data as $a)
{
echo "number is <b><font color=#FF0000>$a[id]</font></b>";
echo "<br/>";
echo "name is <b><font color=#FF0000>$a[name]</font></b>";
echo "<br>";
}
?>

10.memcache管理与监控：

memcache的管理工具：MemAdmin

搭建LAMP环境

php-pear-1.9.4-4.e16.noarch.rpm

php-pecl-memcache-3.0.5-4.e16.x86_64.rpm

在web端配置

vim /etc/php.ini

在配置文件末尾追加extension = memcached.so

关闭防火墙，关闭selinux

下载MemAdmin

http://www.junopen.com/memadmin/memadmin-1.0.12.tar.gz

解压文件至根目录下

[root@web ~]# tar -xzvf memadmin-1.0.12.tar.gz 

打开config.php文件，设置你的管理账号和密码

在浏览器访问memadmin目录，这样就完成了memcache的配置

http://example.com/memadmin/index.php

memcached 监控方法

（1）memcache.php

下载地址 http://pecl.php.net/get/memcache-2.2.7.tgz

（2）memcache自身命令检查 telnet localhost 11211