Tomcat instll

yanchuen

　　Install Tomcat 7 on CentOS, RHEL, or Fedora
　　This post will cover installing and basic configuration of Tomcat 7 on CentOS 5.x. or CentOS 6.x
　　Tomcat 7 implements the JavaServer Pages 2.2 and Servlet 3.0 specifications and a number of new features. The Manager application also has a new look and finer-grain roles and access than 6.x
　　In this post, we'll install Tomcat 7, the new JDK 7, configure Tomcat as a service, create a start/stop script, and (optionally) configure Tomcat to run under a non-root user.
　　We will also configure basic access to Tomcat Manager and take a quick look at memory management using JAVA_OPTS
　　Finally, we will look at running Tomcat on port 80 as well as some strategies for running Tomcat behind Apache.

　　I have just updated this post with Tomcat 7.0.29, the current stable>
　　If you are using a different>　　To begin, we'll need to install the Java Development Kit (JDK) 7
　　JDK 1.6 is the minimum JDK version for Tomcat 7.
Step 1: Install JDK 1.7　　You can download the latest JDK here: http://www.oracle.com/technetwork/java/javase/downloads/index.html
　　We'll install the latest JDK, which is JDK 7, Update 5. The JDK is specific to 32 and 64 bit versions.
　　My CentOS box is 64 bit, so I'll need: jdk-7u5-linux-x64.tar.gz.
　　If you are on 32 bit, you'll need: jdk-7u5-linux-i586.tar.gz
　　Start by creating a new directory /usr/java:
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• 　　[root@srv6 ~]# mkdir /usr/java
  

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• 　　[root@srv6 ~]# mkdir /usr/java
  

　　Change to the /usr/java directory we created
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• 　　[root@srv6 ~]# cd /usr/java
  
• 　　[root@srv6 java ]#
  

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• 　　[root@srv6 ~]# cd /usr/java
  
• 　　[root@srv6 java ]#
  

　　Download the appropriate JDK and save it to /usr/java directory we created above.
　　Unpack jdk-7u5-linux-x64.tar.gz in the /usr/java directory using tar -xzf:
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• 　　[root@srv6 java]# tar -xzf jdk-7u5-linux-x64.tar.gz
  

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• 　　[root@srv6 java]# tar -xzf jdk-7u5-linux-x64.tar.gz
  

　　This will create the directory /usr/java/jdk1.7.0_05. This will be our JAVA_HOME.
　　We can now set JAVA_HOME and put Java into the path of our users.
　　To set it for your current session, you can issue the following from the CLI:
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• 　　[root@srv6 java]# JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　[root@srv6 java]# export JAVA_HOME
  
• 　　[root@srv6 java]# PATH=$JAVA_HOME/bin:$PATH
  
• 　　[root@srv6 java]# export PATH
  

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• 　　[root@srv6 java]# JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　[root@srv6 java]# export JAVA_HOME
  
• 　　[root@srv6 java]# PATH=$JAVA_HOME/bin:$PATH
  
• 　　[root@srv6 java]# export PATH
  

　　To set the JAVA_HOME permanently, however, we need to add below to the ~/.bash_profile of the user (in this case, root).
　　We can also add it /etc/profile and then source it to give to all users.
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• 　　JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　export JAVA_HOME
  
• 　　PATH=$JAVA_HOME/bin:$PATH
  
• 　　export PATH
  

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• 　　JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　export JAVA_HOME
  
• 　　PATH=$JAVA_HOME/bin:$PATH
  
• 　　export PATH
  

Once you have added the above to ~/.bash_profile, you should log out, then log back in and check that the JAVA_HOME is set correctly.view plaincopy to clipboardprint?

• 　　[root@srv6 ~]#  echo $JAVA_HOME
  
• 　　/usr/java/jdk1.7.0_05
  

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• 　　[root@srv6 ~]#  echo $JAVA_HOME
  
• 　　/usr/java/jdk1.7.0_05
  

　　Note: If you decided to use JDK 6 rather than 7 as we did above, simply save the JDK 6 bin file to /opt (or another location), then navigate to /usr/java and issue: 'sh /opt/jdk-6u33-linux-x64.bin'. This will create a JAVA Home of /usr/java/jdk1.6.0.33
Step 2: Download and Unpack Tomcat 7.0.29 (or latest)　　We will install Tomcat 7 under /usr/share.
　　Switch to the /usr/share directory:
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• 　　[root@srv6 ~]# cd /usr/share
  
• 　　[root@srv6 share ]#
  

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• 　　[root@srv6 ~]# cd /usr/share
  
• 　　[root@srv6 share ]#
  

Download apache-tomcat-7.0.29.tar.gz (or the latest version) here　　and save it to /usr/share
　　Once downloaded, you should verify the MD5 Checksum for your Tomcat download using the md5sum command.
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• 　　[root@srv6 share ]# md5sum apache-tomcat-7.0.29.tar.gz
  
• 　　307076fa3827e19fa9b03f3ef7cf1f3f *apache-tomcat-7.0.29.tar.gz
  

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• 　　[root@srv6 share ]# md5sum apache-tomcat-7.0.29.tar.gz
  
• 　　307076fa3827e19fa9b03f3ef7cf1f3f *apache-tomcat-7.0.29.tar.gz
  

Compare the output above to the MD5 Checksum provided next to  the download link and you used above and check that it matches.　　unpack the file using tar -xzf:
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• 　　[root@srv6 share ]# tar -xzf apache-tomcat-7.0.29.tar.gz
  

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• 　　[root@srv6 share ]# tar -xzf apache-tomcat-7.0.29.tar.gz
  

This will create the directory /usr/share/apache-tomcat-7.0.29Step 3: Configure Tomcat to Run as a Service.　　We will now see how to run Tomcat as a service and create a simple Start/Stop/Restart script, as well as to start Tomcat at boot.
　　Change to the /etc/init.d directory and create a script called 'tomcat' as shown below.
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• 　　[root@srv6 share]# cd /etc/init.d
  
• 　　[root@srv6 init.d]# vi tomcat
  

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• 　　[root@srv6 share]# cd /etc/init.d
  
• 　　[root@srv6 init.d]# vi tomcat
  

And here is the script we will use.view plaincopy to clipboardprint?

• 　　#!/bin/bash
  
• 　　# description: Tomcat Start Stop Restart
  
• 　　# processname: tomcat
  
• 　　# chkconfig: 234 20 80
  
• 　　JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　export JAVA_HOME
  
• 　　PATH=$JAVA_HOME/bin:$PATH
  
• 　　export PATH
  
• 　　CATALINA_HOME=/usr/share/apache-tomcat-7.0.29
  
• 　　case $1 in
  
• 　　start)
  
• 　　sh $CATALINA_HOME/bin/startup.sh
  
• 　　;;
  
• 　　stop)
  
• 　　sh $CATALINA_HOME/bin/shutdown.sh
  
• 　　;;
  
• 　　restart)
  
• 　　sh $CATALINA_HOME/bin/shutdown.sh
  
• 　　sh $CATALINA_HOME/bin/startup.sh
  
• 　　;;
  
• 　　esac
  
• 　　exit 0
  

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• 　　#!/bin/bash
  
• 　　# description: Tomcat Start Stop Restart
  
• 　　# processname: tomcat
  
• 　　# chkconfig: 234 20 80
  
• 　　JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　export JAVA_HOME
  
• 　　PATH=$JAVA_HOME/bin:$PATH
  
• 　　export PATH
  
• 　　CATALINA_HOME=/usr/share/apache-tomcat-7.0.29
  
• 　　case $1 in
  
• 　　start)
  
• 　　sh $CATALINA_HOME/bin/startup.sh
  
• 　　;;
  
• 　　stop)
  
• 　　sh $CATALINA_HOME/bin/shutdown.sh
  
• 　　;;
  
• 　　restart)
  
• 　　sh $CATALINA_HOME/bin/shutdown.sh
  
• 　　sh $CATALINA_HOME/bin/startup.sh
  
• 　　;;
  
• 　　esac
  
• 　　exit 0
  

The above script is simple and contains all of the basic elements you will need to get going.　　As you can see, we are simply calling the startup.sh and shutdown.sh scripts located in the Tomcat bin directory (/usr/share/apache-tomcat-7.0.29/bin).
　　You can adjust your script according to your needs and, in subsequent posts, we'll look at additional examples.
　　CATALINA_HOME is the Tomcat home directory (/usr/share/apache-tomcat-7.0.29)
　　Now, set the permissions for your script to make it executable:
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• 　　[root@srv6 init.d]# chmod 755 tomcat
  

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• 　　[root@srv6 init.d]# chmod 755 tomcat
  

We now use the chkconfig utility to have Tomcat start at boot time. In my script above, I am using chkconfig: 234 20 80. 2345 are the run levels and 20 and 80 are the stop and start priorities respectively. You can adjust as needed.view plaincopy to clipboardprint?

• 　　[root@srv6 init.d]# chkconfig --add tomcat
  
• 　　[root@srv6 init.d]# chkconfig --level 234 tomcat on
  

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• 　　[root@srv6 init.d]# chkconfig --add tomcat
  
• 　　[root@srv6 init.d]# chkconfig --level 234 tomcat on
  

Verify it:view plaincopy to clipboardprint?

• 　　[root@srv6 init.d]# chkconfig --list tomcat
  
• 　　tomcat          0:off   1:off   2:on    3:on    4:on    5:off   6:off
  

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• 　　[root@srv6 init.d]# chkconfig --list tomcat
  
• 　　tomcat          0:off   1:off   2:on    3:on    4:on    5:off   6:off
  

Now, let's test our script.　　Start Tomcat:
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• 　　[root@srv6 ~]# service tomcat start
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  

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• 　　[root@srv6 ~]# service tomcat start
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  

Stop Tomcat:view plaincopy to clipboardprint?

• 　　[root@srv6 ~]# service tomcat stop
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  

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• 　　[root@srv6 ~]# service tomcat stop
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  

Restarting Tomcat (Must be started first):view plaincopy to clipboardprint?

• 　　[root@srv6 ~]# service tomcat restart
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  

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• 　　[root@srv6 ~]# service tomcat restart
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  
• 　　Using CATALINA_BASE:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_HOME:   /usr/share/apache-tomcat-7.0.29
  
• 　　Using CATALINA_TMPDIR: /usr/share/apache-tomcat-7.0.29/temp
  
• 　　Using JRE_HOME:        /usr/java/jdk1.7.0_05
  
• 
  　　Using>
  

We should review the Catalina.out log located at /usr/share/apache-tomcat-7.0.29/logs/catalina.out and check for any errors.view plaincopy to clipboardprint?

• 　　[root@srv6 init.d]# more /usr/share/apache-tomcat-7.0.29/logs/catalina.out
  

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• 　　[root@srv6 init.d]# more /usr/share/apache-tomcat-7.0.29/logs/catalina.out
  

We can now access the Tomcat Manager page at:　　http://yourdomain.com:8080 or http://yourIPaddress:8080 and we should see the Tomcat home page.

http://blog.运维网.com/e/u/themes/default/images/spacer.gif

Step 4: Configuring Tomcat Manager Access.　　Tomcat 7 contains a number of changes that offer finer-grain roles.
　　For security reasons, no users or passwords are created for the Tomcat manager roles by default. In a production deployment, it is always best to remove the Manager application.
　　To set roles, user name(s) and password(s), we need to configure the tomcat-users.xml file located at $CATALINA_HOME/conf/tomcat-users.xml.
　　In the case of our installation, $CATALINA_HOME is located at /usr/share/apache-tomcat-7.0.29.
　　By default the Tomcat 7 tomcat-users.xml file will have the elements between the  and  tags commented-out. .
　　New roles for Tomcat 7 offer finer-grained access and The following roles are now available:
　　manager-gui
　　manager-status
　　manager-jmx
　　manager-script
　　admin-gu
　　admin-script.
　　We can set the manager-gui role, for example as below
　　:
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• 　　
  
• 　　
  
• 　　
  
• 　　
  

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• 　　
  
• 　　
  
• 　　
  
• 　　
  

　　Caution should be exercised in granting multiple roles so as not to under-mind security.
Step 5 (Oprtional): Manage Memory Usage Using JAVA_OPTS.　　Getting the right heap memory settings for your installation will depend on a number of factors.

　　For simplicity, we will set our inital heap>　　Simliarly, there are several approaches you can take as to where and how you set your JAVA_OPTS
　　Again, for simplicity, we will add our JAVA_OPTS memory parameters in our Catalina.sh file.
　　So, open the Catalina.sh file located under /usr/share/apache-tomcat-7.0.29/bin with a text editor or vi.

　　Since we are using 128 Mb for both initial and maximum heap>view plaincopy to clipboardprint?

• 　　JAVA_OPTS="-Xms128m -Xmx128m"
  

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• 　　JAVA_OPTS="-Xms128m -Xmx128m"
  

　　I usually just add this in the second line of the file so it looks as so:
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• 　　#!/bin/sh
  
• 　　JAVA_OPTS="-Xms128m -Xmx128m"
  
• 　　# Licensed to the Apache Software Foundation (ASF) under one or more
  
• 　　# contributor license agreements.  See the NOTICE file distributed with
  
• 　　# this work for additional information regarding copyright ownership.
  
• 　　# The ASF licenses this file to You under the Apache License, Version 2.0
  
• 　　# (the "License"); you may not use this file except in compliance with
  
• 　　# the License.  You may obtain a copy of the License at
  

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• 　　#!/bin/sh
  
• 　　JAVA_OPTS="-Xms128m -Xmx128m"
  
• 　　# Licensed to the Apache Software Foundation (ASF) under one or more
  
• 　　# contributor license agreements.  See the NOTICE file distributed with
  
• 　　# this work for additional information regarding copyright ownership.
  
• 　　# The ASF licenses this file to You under the Apache License, Version 2.0
  
• 　　# (the "License"); you may not use this file except in compliance with
  
• 　　# the License.  You may obtain a copy of the License at
  

Step 6 (Optional): How to Run Tomcat using Minimally Privileged (non-root) User.　　In our Tomcat configuration above, we are running Tomcat as Root.
　　For security reasons, it is always best to run services with the only those privileges that are necessary.
　　There are some who make a strong case that this is not required, but it's always best to err on the side of caution.
　　To run Tomcat as non-root user, we need to do the following:
　　1. Create the group 'tomcat':
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• 　　[root@srv6 ~]# groupadd tomcat
  

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• 　　[root@srv6 ~]# groupadd tomcat
  

2. Create the user 'tomcat' and add this user to the tomcat group we created above.view plaincopy to clipboardprint?

• 　　[root@srv6 ~]# useradd -s /bin/bash -g tomcat tomcat
  

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• 　　[root@srv6 ~]# useradd -s /bin/bash -g tomcat tomcat
  

The above will create a home directory for the user tomcat in the default user home as /home/tomcat　　If we want the home directory to be elsewhere, we simply specify so using the -d switch.
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• 　　[root@srv6 ~]# useradd -g tomcat -d /usr/share/apache-tomcat-7.0.29/tomcat tomcat
  

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• 　　[root@srv6 ~]# useradd -g tomcat -d /usr/share/apache-tomcat-7.0.29/tomcat tomcat
  

The above will create the user tomcat's home directory as /usr/share/apache-tomcat-7.0.29/tomcat　　3. Change ownership of the tomcat files to the user tomcat we created above:
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• 　　[root@srv6 ~]# chown -Rf tomcat.tomcat /usr/share/apache-tomcat-7.0.29/
  

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• 　　[root@srv6 ~]# chown -Rf tomcat.tomcat /usr/share/apache-tomcat-7.0.29/
  

Note: it is possible to enhance our security still further by making certain files and directories read-only. This will not be covered in this post and care should be used when setting such permissions.　　4. Adjust the start/stop service script we created above. In our new script, we need to su to the user tomcat:
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• 　　#!/bin/bash
  
• 　　# description: Tomcat Start Stop Restart
  
• 　　# processname: tomcat
  
• 　　# chkconfig: 234 20 80
  
• 　　JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　export JAVA_HOME
  
• 　　PATH=$JAVA_HOME/bin:$PATH
  
• 　　export PATH
  
• 　　CATALINA_HOME=/usr/share/apache-tomcat-7.0.29/bin
  
• 　　case $1 in
  
• 　　start)
  
• 　　/bin/su tomcat $CATALINA_HOME/startup.sh
  
• 　　;;
  
• 　　stop)
  
• 　　/bin/su tomcat $CATALINA_HOME/shutdown.sh
  
• 　　;;
  
• 　　restart)
  
• 　　/bin/su tomcat $CATALINA_HOME/shutdown.sh
  
• 　　/bin/su tomcat $CATALINA_HOME/startup.sh
  
• 　　;;
  
• 　　esac
  
• 　　exit 0
  

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• 　　#!/bin/bash
  
• 　　# description: Tomcat Start Stop Restart
  
• 　　# processname: tomcat
  
• 　　# chkconfig: 234 20 80
  
• 　　JAVA_HOME=/usr/java/jdk1.7.0_05
  
• 　　export JAVA_HOME
  
• 　　PATH=$JAVA_HOME/bin:$PATH
  
• 　　export PATH
  
• 　　CATALINA_HOME=/usr/share/apache-tomcat-7.0.29/bin
  
• 　　case $1 in
  
• 　　start)
  
• 　　/bin/su tomcat $CATALINA_HOME/startup.sh
  
• 　　;;
  
• 　　stop)
  
• 　　/bin/su tomcat $CATALINA_HOME/shutdown.sh
  
• 　　;;
  
• 　　restart)
  
• 　　/bin/su tomcat $CATALINA_HOME/shutdown.sh
  
• 　　/bin/su tomcat $CATALINA_HOME/startup.sh
  
• 　　;;
  
• 　　esac
  
• 　　exit 0
  

Step 7 (Optional): How to Run Tomcat on Port 80 as Non-Root User.　　Note: the following applies when you are running Tomcat in "stand alone" mode with Tomcat running under the minimally privileged user Tomcat we created in the previous step.
　　To run services below port 1024 as a user other than root, you can add the following to your IP tables:
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• 　　[root@srv6 ~]# iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
  
• 　　[root@srv6 ~]# iptables -t nat -A PREROUTING -p udp -m udp --dport 80 -j REDIRECT --to-ports 8080
  

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• 　　[root@srv6 ~]# iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
  
• 　　[root@srv6 ~]# iptables -t nat -A PREROUTING -p udp -m udp --dport 80 -j REDIRECT --to-ports 8080
  

　　Be sure to save and restart your IP Tables.
Step 8 (Optional): Running Tomcat behind Apache
　　As an>　　While Tomcat has improved it's 'standalone performance', I still prefer to have Apace in front of it for a number of reasons.
　　In your Apache config, be sure to set KeepAlive to 'on'. Apache tuning, of course, is a whole subject in itself...
　　Example 1: VHOST with mod_proxy:
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• 　　
  
• 　　ServerAdmin admin@yourdomain.com
  
• 　　ServerName yourdomain.com
  
• 　　ServerAlias www.yourdomain.com
  
• 　　ProxyRequests Off
  
• 　　ProxyPreserveHost On
  
• 　　
  
• 　　Order allow,deny
  
• 　　Allow from all
  
• 　　
  
• 　　ProxyPass / http://localhost:8080/
  
• 　　ProxyPa***everse / http://localhost:8080/
  
• 　　ErrorLog logs/yourdomain.com-error_log
  
• 　　CustomLog logs/yourdomain.com-access_log common
  
• 　　
  

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• 　　
  
• 　　ServerAdmin admin@yourdomain.com
  
• 　　ServerName yourdomain.com
  
• 　　ServerAlias www.yourdomain.com
  
• 　　ProxyRequests Off
  
• 　　ProxyPreserveHost On
  
• 　　
  
• 　　Order allow,deny
  
• 　　Allow from all
  
• 　　
  
• 　　ProxyPass / http://localhost:8080/
  
• 　　ProxyPa***everse / http://localhost:8080/
  
• 　　ErrorLog logs/yourdomain.com-error_log
  
• 　　CustomLog logs/yourdomain.com-access_log common
  
• 　　
  

　　Example 2: VHOST with ajp connector and mod_proxy:
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• 　　
  
• 　　ServerAdmin admin@yourdomain.com
  
• 　　ServerName yourdomain.com
  
• 　　ServerAlias www.yourdomain.com
  
• 　　ProxyRequests Off
  
• 　　ProxyPreserveHost On
  
• 　　
  
• 　　Order allow,deny
  
• 　　Allow from all
  
• 　　
  
• 　　ProxyPass / ajp://localhost:8009/
  
• 　　ProxyPa***everse / ajp://localhost:8009/
  
• 　　ErrorLog logs/yourdomain.com-error_log
  
• 　　CustomLog logs/yourdomain.com-access_log common
  
• 　　
  

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• 　　
  
• 　　ServerAdmin admin@yourdomain.com
  
• 　　ServerName yourdomain.com
  
• 　　ServerAlias www.yourdomain.com
  
• 　　ProxyRequests Off
  
• 　　ProxyPreserveHost On
  
• 　　
  
• 　　Order allow,deny
  
• 　　Allow from all
  
• 　　
  
• 　　ProxyPass / ajp://localhost:8009/
  
• 　　ProxyPa***everse / ajp://localhost:8009/
  
• 　　ErrorLog logs/yourdomain.com-error_log
  
• 　　CustomLog logs/yourdomain.com-access_log common
  
• 　　
  

　　In both vhost examples above, we are "mapping" the domain to Tomcat's ROOT directory.
　　If we wish to map to an application such as yourdomain.com/myapp, we can add some rewrite as shown below.
　　This will rewrite all requests for yourdomain.com to yourdomain.com/myapp.
　　Example 3: VHOST with rewrite:
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• 　　
  
• 　　ServerAdmin admin@yourdomain.com
  
• 　　ServerName yourdomain.com
  
• 　　ServerAlias www.yourdomain.com
  
• 　　RewriteEngine On
  
• 　　RewriteRule ^/$ myapp/ [R=301]
  
• 　　ProxyRequests Off
  
• 　　ProxyPreserveHost On
  
• 　　
  
• 　　Order allow,deny
  
• 　　Allow from all
  
• 　　
  
• 　　ProxyPass / ajp://localhost:8009/
  
• 　　ProxyPa***everse / ajp://localhost:8009/
  
• 　　ErrorLog logs/yourdomain.com-error_log
  
• 　　CustomLog logs/yourdomain.com-access_log common
  
• 　　
  

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• 　　
  
• 　　ServerAdmin admin@yourdomain.com
  
• 　　ServerName yourdomain.com
  
• 　　ServerAlias www.yourdomain.com
  
• 　　RewriteEngine On
  
• 　　RewriteRule ^/$ myapp/ [R=301]
  
• 　　ProxyRequests Off
  
• 　　ProxyPreserveHost On
  
• 　　
  
• 　　Order allow,deny
  
• 　　Allow from all
  
• 　　
  
• 　　ProxyPass / ajp://localhost:8009/
  
• 　　ProxyPa***everse / ajp://localhost:8009/
  
• 　　ErrorLog logs/yourdomain.com-error_log
  
• 　　CustomLog logs/yourdomain.com-access_log common
  
•