docker pull imagine10255/centos6-lnmp-php56
docker run -itd --name lnmp1 -p 8081:80 imagine10255/centos6-lnmp-php56
docker run -itd --name lnmp2 -p 8082:80 imagine10255/centos6-lnmp-php56
docker run -itd --name lnmp3 -p 8083:80 imagine10255/centos6-lnmp-php56

 upstream up1{server 47.91.209.222:8081;server 47.91.209.222:8082;server 47.91.209.222:8083;}server {listen       80;server_name  www.zpfei.net;location / {proxy_pass http://up1;}.........}

<?php
header('content-type:text/html;charset=utf-8');//将session存储方式设置为存入数据库的方式
//session.save_handler = files
ini_set("session.save_handler", "user");session_set_save_handler("open", "close", "read", "write", "destroy", "gc");//打开并连接数据库
function open()
{//使用pdo$pdo = new PDO('mysql:host=47.91.209.222;dbname=session','user','000');$pdo->exec('set names utf8');
}//关闭连接
function close()
{//使用pdo$pdo = new PDO('mysql:host=47.91.209.222;dbname=session','user','000');$pdo->exec('set names utf8');$pdo = null;
}//从表中中读信息
function read($session_id)
{//使用pdo$pdo = new PDO('mysql:host=47.91.209.222;dbname=session','user','000');$pdo->exec('set names utf8');$read = $pdo->query("select * from session where session_id='$session_id'")->fetch(PDO::FETCH_ASSOC);return $read["session_info"];
}//将session存入数据库
function write ($session_id,$session_info)
{// echo $session_id. "        " . $session_info;//使用pdo$pdo = new PDO('mysql:host=47.91.209.222;dbname=session','user','000');$pdo->exec('set names utf8');$read = $pdo->query("select * from session where session_id='$session_id'")->fetch(PDO::FETCH_ASSOC);if(empty($read)){$time = time();$pdo->exec("insert into session (session_id, session_info, session_life) values ('$session_id', '$session_info', '$time')");}else{$sql = "update session set session_info='$session_info' where session_id='$session_id'";$pdo->exec($sql);}
}//销毁指定session
function destroy($session_id)
{//使用pdo$pdo = new PDO('mysql:host=47.91.209.222;dbname=session','user','000');$pdo->exec('set names utf8');$pdo->exec("delete from session where session_id='$session_id'");
}//删除所有过期的session
function gc()
{}session_start();
//判断是否有sessionvar_dump($_SESSION);
?>