研究了下nginx+tomcat+memcached 的配置，练习了下脚本的书写，参考了好几篇文章，在此记录一下，有不对的地方敬请指正。
系统环境：
RHEL6.5 x64
iptables -F & selinux is disabled
主机角色：
node1 :192.168.122.101 :nginx tomcat memcached
node2 :192.168.122.102 :tomcat memcached
https://code.google.com/memcached-session-manager
memcached的session管理
nginx做反向代理两台tomcat，用memcached同步session，防止数据丢失
Tomcat1将session存储在memcacted2上.tomcat和Memcached使用交叉存储,只有当M2不可用时T1才将数据存储在M1上(M1是T1的failoverNode),使用这种方式可以避免单点故障.从而实现应用的高可用性.
注意:两台node上的tomcat应完全一致
1.在两台node主机上配置tomcat环境
<code><span>#./jdk-6u32-linux-x64.bin</span><span># mv jdk1.6.0_32/ /usr/local/lnmp/jdk</span><span>#vim /etc/profile 编写环境变量</span>export JAVA_HOME=/usr/local/lnmp/jdk
export CLASSPATH=:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$PATH:$JAVA_HOME/bin
<span>#source /etc/profile</span>测试java能否正常工作
<span>#vim test.java</span><span>public</span><span><span>class</span><span>test</span>{</span><span>public</span><span>static</span><span>void</span> main(String[] args)
{System.out.println(<span>"Hello!"</span>); }
}
<span>#javac test.java 编译</span><span>#java test 执行后出现Hello!说明java环境配置好</span></code>安装tomcat服务器
<code><span>#tar zxf apache-tomcat-7.0.37.tar.gz 解压就能用,不需要编译</span><span>#mv apache-tomcat-7.0.37 tomcat</span><span>#/TOMCAT_ROOT_DIR/tomcat/webapps/ROOT tomcat的默认发布目录</span><span>#/TOMCAT_ROOT_DIR/tomcat/bin/startup.sh(shutdown.sh) tomcat默认的启动和关闭脚本</span></code>
tomcat默认开启8080端口,
测试http://192.168.122.101:8080 访问到tomcat默认的测试页
<code><span>#cd tomcat/webapps/ROOT</span><span>#cat test.jsp #测试页</span><span>this</span> time is: new java.util.Date()%></code>
测试访问;http://192.168.122.101:8080 显示当前时间
tomcat访问8080端口,使用nginx反向代理。
使用nginx发布jsp动态网页:
nginx配置文件:
cat /usr/local/nginx/conf/nginx.conf
<code><span>#user nginx nginx;</span>
worker_processes <span>4</span>;
<span>#error_log logs/error.log;</span><span>#error_log logs/error.log notice;</span><span>#error_log logs/error.log info;</span><span>#pid logs/nginx.pid;</span>events {
use epoll;
worker_connections <span>1024</span>;
}
http {
upstream tomcat { <span>#两台tomcat负载均衡</span>
sticky; <span>#session同步，为nginx的模块</span><span>server</span><span>192.168</span><span>.0</span><span>.1</span>:<span>8080</span>;
<span>server</span><span>192.168</span><span>.0</span><span>.2</span>:<span>8080</span>;
}
include mime.types;
default_type application/octet-stream;
<span>#log_format main '$remote_addr - $remote_user [$time_local] "$request" '</span><span># '$status $body_bytes_sent "$http_referer" '</span><span>#access_log logs/access.log main;</span> sendfile on;
<span>#tcp_nopush on;</span><span>#keepalive_timeout 0;</span>
keepalive_timeout <span>65</span>;
<span>#gzip on;</span><span>server</span> {
listen <span>80</span>;
server_name localhost;
<span>#charset koi8-r;</span><span>#access_log logs/host.access.log main;</span> location / {
root html;
proxy_pass http:<span>//tomcat;</span><span>index</span><span>index</span>.html <span>index</span>.htm;
}
<span>#error_page 404 /404.html;</span><span># redirect server error pages to the static page /50x.html</span>
error_page <span>500</span><span>502</span><span>503</span><span>504</span> /<span>50</span>x.html;
location = /<span>50</span>x.html {
root html;
}
location ~ \.jsp$ {
proxy_pass http:<span>//tomcat;</span>
}
}
nginx -t && nginx -s reload</code>访问:http://192.168.122.101/test.jsp 测试
同步两台tomcat的内容，并且修改java环境变量/etc/profile
测试：http://192.168.122.102:8080/test.jsp
两台node(tomcat)准备好了
2、在node1上的nginx环境中发布网页
使用nginx的负载均衡功能,
体现在nginx.conf中：
<code><span>upstream</span> tomcat-lb {
<span>server</span><span>192.168.122.101:8080</span>;
<span>server</span><span>192.168.122.102:8080</span>;
}
<span>location</span><span>~ \.jsp$</span> {
<span>proxy_pass</span><span>http://tomcat-lb</span>;
}
<span>nginx</span> -t && nginx -s reload</code>测试：http：//192.168.122.101/test.jsp
实现两台主机的负载均衡(访问nginx所在的node)
问题：在后台实现了nginx的负载均衡，但是当一个用户刷新数据时，数据总是变化的，试想，在动态页面，如果用户提交数据刷新后并没有提交到服务器上，并且必须要重新填写表格，这样会造成糟糕的用户体验。
解决:给nginx增加一个sticky模块.(需要重新编译nginx)
重新在nginx在进行模块化编译：
nginx-sticky-modules.tar.gz(解压就行)
<code><span>#tar zxf nginx-sticky-modules.tar.gz -C /root/nginx-1.4.2</span><span>#cd nginx-1.4.2/</span><span>#make clean</span><span>#./configure --prefix=/usr/local/nginx --add-module=$NGINX_PKG_DIR/$DIR/nginx-sticky-module-1.0 --with-http_ssl_module --with-http_stub_status_module</span><span>#make && make install</span><span>#vim nginx.conf</span>upstream linux {
sticky; #装了nginx-sticky后的功能
server <span>192.168</span><span>.122</span><span>.101</span>:<span>8080</span> ;
server <span>192.168</span><span>.122</span><span>.102</span>:<span>8080</span> ;
}</code>测试：http://192.168.122.101/test.jsp 后发现刷新不会来回负载(每个用户看到的其实不是一个tomcat上的数据,但是对用户是透明的)
3.nginx负载tomcat的jsp时,需要解决session共享:
使用memcache进行缓存(用户)后端数据,但是又要想到解决单点故障问题,因而可以采用两台memcache作为后端负载.
memcached默认端口11211，后端使用交叉存储(tomcat会将session同步，session自动寻找存储的memcached，但是默认是交叉存储，当一个memcached服务器坏掉，tomcat都会存到存活的memcached服务器上)
只要tomcat不宕掉,一切数据都还存在
但是当memcached宕掉,tomcat会向存活的memcached上存取
session 的序列化方案官方推荐的有 4 种:
java serialization
msm-kryo-serializer
msm-javolution-serializer
msm-xstream-serializer
其中性能最好的是Kryo,我们使用kryo来做
mecached服务器node1 and node2
<code><span>#yum install memcached -y</span><span>#/etc/init.d/memcached start</span></code>
memcached默认开启11211端口
测试访问:telnet localhost 11211
stats 查看状态
set user 0 0 3 存储新值(add replace)
get user 获取值
配置两台memcached服务器(tomcat),下载jar包(必须支持相关的java程序)
提供测试环境的包，解压即可用：
链接: http://pan.baidu.com/s/1mgIF9NU 密码: n5wu
asm-3.2.jar
couchbase-client-1.2.2.jar
kryo-1.03.jar
kryo-serializers-0.11.jar
memcached-session-manager-1.6.5.jar
memcached-session-manager-tc7-1.6.5.jar
minlog-1.2.jar
msm-kryo-serializer-1.6.5.jar
reflectasm-0.9.jar
spymemcached-2.10.3.jar
node1 and node2 同步内容
<code><span>#cd tomcat/lib/</span><span>#mget jar/* 下载tomcat的session共享管理包</span><span>#cd tomcat/conf/</span><span># vim context.xml</span><manager classname="<span">"de.javakaffee.web.msm.MemcachedBackupSessionManager" memcachedNodes=<span>"n1:192.168.122.101:11211,n2:192.168.122.102:11211"</span> failoverNodes=<span>"n1"</span> #tomcat2需要写成n2 requestUriIgnorePattern=<span>".*\.(ico|png|gif|jpg|css|js)$"</span> transcoderFactoryClass=<span>"de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"</span> /> <span>#tomcat/bin/shutdown.sh #重启tomcat,以识别memcached-session-manager</span><span># tail -f logs/catalina.out #默认日志</span>INFO: MemcachedSessionService finished initialization, sticky <span>true</span>, operation timeout <span>1000</span>, with node ids [n2] and failover node ids [n1]</manager></code>
正常启动
编辑测试文件:(提交用户信息的jsp测试页)
<code># vim tomcat/webapps/ROOT/test.jsp
<span>"text/html; charset=GBK"</span> %><span>"java.util.*"</span> %><span>html</span>><span>head</span>><span>title</span>>Cluster App Test<span><span>title</span>></span><span><span>head</span>></span><span>body</span>>Server Info:
<span>request</span>.getLocalAddr() + <span>" : "</span> + <span>request</span>.getLocalPort()+<span>"<br>"</span>);%><span>"<br> ID "</span> + session.getId()+<span>"<br>"</span>);
<span>String</span> dataName = <span>request</span>.getParameter(<span>"dataName"</span>);
<span>if</span> (dataName != <span>null</span> && dataName.length() > <span>0</span>) {
<span>String</span> dataValue = <span>request</span>.getParameter(<span>"dataValue"</span>);
session.setAttribute(dataName, dataValue);
}
out.print(<span>"<b>Session list</b>"</span>);
Enumeration e = session.getAttributeNames();
<span>while</span> (e.hasMoreElements()) {
<span>String</span> name = (<span>String</span>)e.nextElement();
<span>String</span> value = session.getAttribute(name).toString();
out.println( name + <span>" = "</span> + value+<span>"<br>"</span>);
System.out.println( name + <span>" = "</span> + value);
}
%><span>form</span><span>action</span>=<span>"test.jsp"</span><span>method</span>=<span>"POST"</span>>name:<span>input</span><span>type</span>=<span>text</span><span>size</span>=<span>20</span><span>name</span>=<span>"dataName"</span>><span>br</span>>key:<span>input</span><span>type</span>=<span>text</span><span>size</span>=<span>20</span><span>name</span>=<span>"dataValue"</span>><span>br</span>><span>input</span><span>type</span>=<span>submit</span>><span><span>form</span>></span><span><span>body</span>></span><span><span>html</span>></span></code>session共享完成:两台tomcat和memcached做相同的配置(jdk,memcache,tomcat)
测试:
http://192.168.122.101/test.jsp
使用一台tomcat和另外一台的memcached进行session共享
任何一台tomcat或者memcached挂了都无所谓
session会记录并且保持用户的数据信息
我同时写了一键安装的脚本，还有一些问题，也分享出来，希望有大神能指点～～
第一个，在有nginx的机器上运行：
<code><span>#!/bin/bash
</span>
setenforce <span>0</span> > /dev/null
iptables -F > /dev/null
sed -i <span>'s/^SELINUX=enforcing/SELINUX=disabled/g'</span> /etc/selinux/config
<span>############### nginx + tomcat + memcached</span>DIR_NOW=`<span>pwd</span>`
IPADDR_NTM=<span>'192.168.122.101'</span>
IPADDR_TM=<span>'192.168.122.102'</span>NGINX_PKG_DIR=<span>'/root/one_key_install'</span>
NGINX_PKG_NAME=<span>'nginx-1.6.1.tar.gz'</span>
NGINX_DIR=<span>'/usr/local/nginx'</span>TOMCAT_PKG_DIR=<span>'/root/one_key_install'</span>
TOMCAT_PKG_NAME=<span>'apache-tomcat-7.0.37.tar.gz'</span>
TOMCAT_DIR=<span>'/usr/local/tomcat'</span>STICKY_PKG_DIR=<span>'/root/one_key_install'</span>
STICKY_PKG_NAME=<span>'nginx-sticky-module-1.0.tar.gz'</span>JDK_BIN_DIR=<span>'/root/one_key_install'</span>
JDK_BIN_NAME=<span>'jdk-6u32-linux-x64.bin'</span><span>################### nginx + sticky install</span><span>cd</span><span>$NGINX_PKG_DIR</span>
tar zxf <span>$NGINX_PKG_NAME</span>
DIR=`ls -F | grep /$ | grep nginx | awk -F <span>'/'</span><span>'{print $1}'</span>`
tar zxf <span>$STICKY_PKG_DIR</span>/<span>$STICKY_PKG_NAME</span> -C <span>$NGINX_PKG_DIR</span>/<span>$DIR</span>sed -i <span>'s/^CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g'</span> /<span>$NGINX_PKG_DIR</span>/<span>$DIR</span>/auto/cc/gcc
sed -i <span>'s/^#define NGINX_VER \"nginx\/\" NGINX_VERSION/#define NGINX_VER \"nginx\/\"/g'</span> /<span>$NGINX_PKG_DIR</span>/<span>$DIR</span>/src/core/nginx.h
yum install gcc pcre-devel openssl-devel -y
<span>cd</span><span>$NGINX_PKG_DIR</span>/<span>$DIR</span>
./configure --prefix=/usr/local/nginx --add-module=<span>$NGINX_PKG_DIR</span>/<span>$DIR</span>/nginx-sticky-module-<span>1.0</span> --with-http_ssl_module --with-http_stub_status_module
make && make install
ln <span>-s</span> /usr/local/nginx/sbin/nginx /usr/local/sbin/
useradd -M <span>-d</span> /usr/local/nginx/ <span>-s</span> /sbin/nologin nginx
<span>cd</span><span>$DIR_NOW</span>
rm <span>-f</span> /usr/local/nginx/conf/nginx.conf
cp nginx.conf.exp /usr/local/nginx/conf/nginx.conf
sed -i <span>"s/server 192.168.0.1:8080;/server <span>${IPADDR_NTM}</span>:8080;/g"</span> /usr/local/nginx/conf/nginx.conf
sed -i <span>"s/server 192.168.0.2:8080;/server <span>${IPADDR_TM}</span>:8080;/g"</span> /usr/local/nginx/conf/nginx.conf
<span>##################### tomcat install</span><span>cd</span><span>$JDK_BIN_DIR</span>
sh <span>$JDK_BIN_NAME</span>
DIR=`ls -F | grep /$ | grep jdk | awk -F <span>'/'</span><span>'{print $1}'</span>`
mv <span>$DIR</span> /usr/local/
mv /usr/local/<span>$DIR</span> /usr/local/jdk
<span>echo</span><span>"export JAVA_HOME=/usr/local/jdk
export CLASSPATH=:\$JAVA_HOME/lib
export PATH=\$PATH:\$JAVA_HOME/bin
"</span>>>/etc/profile
<span>cd</span><span>$TOMCAT_PKG_DIR</span>
tar zxf <span>$TOMCAT_PKG_NAME</span> -C /usr/local
<span>cd</span> /usr/local
mv /usr/local/`ls | grep tomcat` /usr/local/tomcat
ln <span>-s</span> /usr/local/tomcat/bin/startup.sh /usr/local/sbin/tomcat-start
ln <span>-s</span> /usr/local/tomcat/bin/shutdown.sh /usr/local/sbin/tomcat-stop
<span>cd</span><span>$DIR_NOW</span>
tar zxf kryo_pkgs.tar.gz
<span>cd</span> kryo_pkgs
cp * /usr/local/tomcat/lib
<span>cd</span><span>$DIR_NOW</span>
rm <span>-f</span> /usr/local/tomcat/conf/context.xml
cp context.xml.exp /usr/local/tomcat/conf/context.xml
<span>cd</span><span>$DIR_NOW</span>
rm <span>-f</span> /usr/local/tomcat/conf/context.xml
cp context.xml.exp /usr/local/tomcat/conf/context.xml
sed -i <span>"s#memcachedNodes=\"n1:192.168.0.1:11211,n2:192.168.0.2:11211\"#memcachedNodes=\"n1:<span>${IPADDR_NTM}</span>:11211,n2:<span>${IPADDR_TM}</span>:11211\"#"</span> /usr/local/tomcat/conf/context.xml
<span>#################### memcached install</span>yum install memcached -y
<span>#################### start services</span>
/etc/init.d/memcached start
<span>source</span> /etc/profile
tomcat-start
nginx</code>第二个，在只有tomcat和memcached的机器上运行
<code><span>#!/bin/bash
</span>
setenforce <span>0</span> > /dev/null
iptables -F > /dev/null
sed -i <span>'s/^SELINUX=enforcing/SELINUX=disabled/g'</span> /etc/selinux/config
DIR_NOW=`<span>pwd</span>`
IPADDR_NTM=<span>'192.168.122.101'</span>
IPADDR_TM=<span>'192.168.122.102'</span>TOMCAT_PKG_DIR=<span>'/root/no_ngx'</span>
TOMCAT_PKG_NAME=<span>'apache-tomcat-7.0.37.tar.gz'</span>
TOMCAT_DIR=<span>'/usr/local/tomcat'</span>STICKY_PKG_DIR=<span>'/root/no_ngx'</span>
STICKY_PKG_NAME=<span>'nginx-sticky-module-1.0.tar.gz'</span>JDK_BIN_DIR=<span>'/root/no_ngx'</span>
JDK_BIN_NAME=<span>'jdk-6u32-linux-x64.bin'</span><span>cd</span><span>$JDK_BIN_DIR</span>
sh <span>$JDK_BIN_NAME</span>DIR=`ls -F | grep /$ | grep jdk | awk -F <span>'/'</span><span>'{print $1}'</span>`
mv <span>$DIR</span> /usr/local/
mv /usr/local/<span>$DIR</span> /usr/local/jdk
<span>echo</span><span>"export JAVA_HOME=/usr/local/jdk
export CLASSPATH=:\$JAVA_HOME/lib
export PATH=\$PATH:\$JAVA_HOME/bin
"</span>>>/etc/profile
<span>cd</span><span>$TOMCAT_PKG_DIR</span>
tar zxf <span>$TOMCAT_PKG_NAME</span> -C /usr/local/
<span>cd</span> /usr/local
mv /usr/local/`ls | grep tomcat` /usr/local/tomcat
<span>cd</span><span>$DIR_NOW</span>
tar zxf kryo_pkgs.tar.gz
<span>cd</span> kryo_pkgs
cp * /usr/local/tomcat/lib
<span>cd</span><span>$DIR_NOW</span>
rm <span>-f</span> /usr/local/tomcat/conf/context.xml
cp context.xml.exp /usr/local/tomcat/conf/
mv /usr/local/tomcat/conf/context.xml.exp /usr/local/tomcat/conf/context.xml
sed -i <span>"s#memcachedNodes=\"n1:192.168.0.1:11211,n2:192.168.0.2:11211\"#memcachedNodes=\"n1:<span>${IPADDR_NTM}</span>:11211,n2:<span>${IPADDR_TM}</span>:11211\"#"</span> /usr/local/tomcat/conf/context.xml
sed -i <span>'s/failoverNodes="n1"/failoverNodes="n2"/'</span> /usr/local/tomcat/conf/context.xml
yum install memcached -y
/etc/init.d/memcached start
<span>source</span> /etc/profile
ln <span>-s</span> /usr/local/tomcat/bin/startup.sh /usr/local/sbin/tomcat-start
ln <span>-s</span> /usr/local/tomcat/bin/shutdown.sh /usr/local/sbin/tomcat-stop
tomcat-start</code>这两个脚本存在同样的问题，执行完毕之后发现
<code><span>source</span> /etc/profile</code>
这一句没有执行，必须手动执行，一直百思不得其解，希望有谁能解答，多谢啦～～
以上就介绍了nginx+tomcat+memcached配置+脚本，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
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