Tomcat + HTTP reverse proxy + memcached session persistence

The Tomcat server is a free open-source Web application server, which is a lightweight application server. It is widely used in small and medium systems and concurrent users, is the first choice for developing and debugging JSP programs. For a beginner, it can be thought that when an Apache server is configured on a machine, it can be used to respond to HTML (an application under the standard General Markup Language .) Page access request. In fact, Tomcat is an extension of the Apache server, but it runs independently. Therefore, when you run tomcat, it actually runs independently as a process independent of Apache.

The trick is that when the configuration is correct, Apache serves the HTML page, while Tomcat actually runs the JSP page and servlet. In addition, like Web servers such as Tomcat and IIS, Tomcat can process HTML pages. In addition, it is a Servlet and JSP Container, and an independent servlet container is the default mode of Tomcat. However, Tomcat cannot process static html as well as Apache servers. The latest version of Tomcat is 8.0.0-RC1 (alpha) released.

Tomcat is very popular with programmers, because it occupies a small amount of system resources during running and has good scalability. It supports common functions of development application systems such as load balancing and mail service; in addition, it is constantly being improved and improved. Any interested programmer can change it or add new functions to it.

Ii. Deployment of JDK in the Java environment

2.1 Java Introduction

Java components mainly include four independent but related technologies:

Java programming language design, Java API, Java class, JVM. Among them, JVM is a Java Virtual Machine. Different systems use JVM to parse and run Java programs. In this way, Java's philosophical principle is realized: one compilation and running everywhere!

JVM implementation method:

The interpreter interprets the byte and executes it. The interpreter parses the byte in one sentence;

The instant compiler caches the interpreted data and requires more memory to cache the interpreted results;

Adaptive Compiler: caches 20% of the code and increases the speed by about 80%. This follows the "rule "!

JVM types:

Sun's hotspot JVM, including JRE and JDK, implements only the Java Runtime Environment, while JDK contains the Java development environment and runtime environment;

Open-source openjdk: similar to JDK, it is also a combination of development and runtime environments.

Java can be divided into two types based on different application fields.
Java SE: Standard Edition, formerly j2se
Java EE: Enterprise Edition, J2EE
Jave me: mobile edition

2.2 install and configure JDK in the Java environment

The installation of the Java environment allows you to install rpm, common binary, and Source Code compiling methods. Here, yum is used to install

# Yum-y install java-1.6.0-openjdk *

Iii. Experiment Process

1. Experiment Topology

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2. experiment environment

Apache 192.168.1.135

Tomcata 192.168.1.133

Tomcatb 192.168.1.134

Memcached 192.168.1.135)

Memcached related packages

Javolution-5.4.3.1.jar

Memcached-2.4.2.jar

Memcached-session-manager-1.3.0.jar

Msm-javolution-serializer-cglib-1.3.0.jar

Msm-javolution-serializer-jodatime-1.3.0.jar

In the attachment

Install Tomcat

Yum-y install Tomcat 6 tomcat6-webapps tomcat6-admin-webapps

Tomcat6-docs-webapp tomcat6-javadoc

Tomcat6 configuration file:/etc/tomcat6

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The main configuration file is server. xml.

All content under/usr/share/tomcat6/

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Install javacenter2.0.

First modify server. xml

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Create the jcenter directory under webapps, decompress all content under the javacenter installation package, and modify

Config. properties file with 777 permission

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Authorize jcenter in local database and create relevant database

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Start Installation

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Result

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Create the test directory under webapps and write down the test homepage.

Index. jsp

Verify

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Write the same test file in tomcatb.

2. on the Apache server

Reverse Proxy experiment of httpd

View the current version of the httpd Module

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Add the following virtual host to the HTTP configuration file:

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Note that the local hosts file can be parsed and IP addresses are used if the local hosts file fails to be parsed.

Verify

 

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3. Apache Server Load balancer cluster + memcached maintain session

Apache cluster configuration file

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Then, enable the memcached server and modify the configuration file of Tomcat's context. xml. For details, see

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Verify

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Tomcat + HTTP reverse proxy + memcached session persistence