在centos6系列vps装Tomcat8.0

In the following tutorial you will learn how to install and set-up Apache Tomcat 8 on your CentOS 6 VPS.

What is Tomcat?

Apache Tomcat (before known as Jakarta Tomcat) is an application server developed by the Apache Software Foundation that executes Java servlets and renders Web pages that include Java Server Page coding.

UPDATE THE SYSTEM
Make sure you are in a screen session and your CentOS 6 based Linux Virtual Server is up-to-date by running:
`

screen -U -S tomcat8-screen

yum update

`
INSTALL JAVA 8
Download the latest JAVA 8 from here or use the following command to download JAVA JDK 8u5:

for 32bit systems use:
`

wget --no-cookies

--no-check-certificate
--header "Cookie: oraclelicense=accept-securebackup-cookie"
"http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-linux-i586.rpm"
-O /opt/jdk-8-linux-i586.rpm
for 64bit systems use:

wget --no-cookies

--no-check-certificate
--header "Cookie: oraclelicense=accept-securebackup-cookie"
"http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-linux-x64.rpm"
-O /opt/jdk-8-linux-x64.rpm
`
once the JAVA package has been downloaded, install it using rpm as follows:

for 32bit systems use:

## rpm -Uvh /opt/jdk-8-linux-i586.rpm
for 64bit systems use:

## rpm -Uvh /opt/jdk-8-linux-x64.rpm
CONFIGURE JAVA
configure the newly installed JAVA package using alternatives as in:
`

alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_05/jre/bin/java 20000

alternatives --install /usr/bin/jar jar /usr/java/jdk1.8.0_05/bin/jar 20000

alternatives --install /usr/bin/javac javac /usr/java/jdk1.8.0_05/bin/javac 20000

alternatives --install /usr/bin/javaws javaws /usr/java/jdk1.8.0_05/jre/bin/javaws 20000

alternatives --set java /usr/java/jdk1.8.0_05/jre/bin/java

alternatives --set javaws /usr/java/jdk1.8.0_05/jre/bin/javaws

alternatives --set javac /usr/java/jdk1.8.0_05/bin/javac

alternatives --set jar /usr/java/jdk1.8.0_05/bin/jar

`
check the JAVA version running on your system:

## java -version
INSTALL TOMCAT 8
Create a separate user which will run the Tomcat server:

## useradd -r tomcat8 --shell /bin/false
Download the latest Tomcat 8 version from here or use the following command to download Tomcat 8.0.5

## wget http://mirrors.koehn.com/apache/tomcat/tomcat-8/v8.0.5/bin/apache-tomcat-8.0.5.tar.gz -P /tmp
Extract the contents of the Tomcat archive to /opt using the following command:
`

tar -zxf /tmp/apache-tomcat-8.0.5.tar.gz -C /opt

ln -s /opt/apache-tomcat-8.0.5 /opt/tomcat-latest

chown -hR tomcat8: /opt/tomcat-latest /opt/apache-tomcat-8.0.5

`
START THE TOMCAT 8 SERVICE
Create the following init script in /etc/init.d/tomcat8

# 
# tomcat8  
#  
# chkconfig: - 80 20 
#  
### BEGIN INIT INFO 
# Provides: tomcat8   
# Required-Start: $network $syslog  
# Required-Stop: $network $syslog  
# Default-Start: 
# Default-Stop:
# Description: Tomcat 8  
# Short-Description: start and stop tomcat
### END INIT INFO

## Source function library.
#. /etc/rc.d/init.d/functions
export JAVA_HOME=/usr/java/default
export JAVA_OPTS="-Dfile.encoding=UTF-8 
  -Dnet.sf.ehcache.skipUpdateCheck=true 
  -XX:+UseConcMarkSweepGC 
  -XX:+CMSClassUnloadingEnabled 
  -XX:+UseParNewGC 
  -XX:MaxPermSize=128m 
  -Xms512m -Xmx512m"
export PATH=$JAVA_HOME/bin:$PATH
TOMCAT_HOME=/opt/tomcat-latest
TOMCAT_USER=tomcat8
SHUTDOWN_WAIT=20

tomcat_pid() {
  echo `ps aux | grep org.apache.catalina.startup.Bootstrap | grep -v grep | awk '{ print $2 }'`
}

start() {
  pid=$(tomcat_pid)
  if [ -n "$pid" ] 
  then
    echo "Tomcat is already running (pid: $pid)"
  else
    # Start tomcat
    echo "Starting tomcat"
    ulimit -n 100000
    umask 007
    /bin/su -p -s /bin/sh $TOMCAT_USER $TOMCAT_HOME/bin/startup.sh
  fi


  return 0
}

stop() {
  pid=$(tomcat_pid)
  if [ -n "$pid" ]
  then
    echo "Stoping Tomcat"
    /bin/su -p -s /bin/sh $TOMCAT_USER $TOMCAT_HOME/bin/shutdown.sh

    let kwait=$SHUTDOWN_WAIT
    count=0;
    until [ `ps -p $pid | grep -c $pid` = '0' ] || [ $count -gt $kwait ]
    do
      echo -n -e "
waiting for processes to exit";
      sleep 1
      let count=$count+1;
    done

    if [ $count -gt $kwait ]; then
      echo -n -e "
killing processes which didn't stop after $SHUTDOWN_WAIT seconds"
      kill -9 $pid
    fi
  else
    echo "Tomcat is not running"
  fi
 
  return 0
}

case $1 in
start)
  start
;; 
stop)   
  stop
;; 
restart)
  stop
  start
;;
status)
  pid=$(tomcat_pid)
  if [ -n "$pid" ]
  then
    echo "Tomcat is running with pid: $pid"
  else
    echo "Tomcat is not running"
  fi
;; 
esac    
exit 0

make the script executable using chmod

chmod +x /etc/init.d/tomcat8

Start the Tomcat 8 server using:

service tomcat8 start

Add the Tomcat 8 service to system startup:

chkconfig tomcat8 on

Access your newly installed Tomcat at http://YOUR_IP:8080

Of course you don’t have to do any of this if you use one of our Linux VPS Hosting services, in which case you can simply ask our expert Linux admins to install Tomcat 8 for you. They are available 24×7 and will take care of your request immediately.

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