Installing Jboss On Linux

This blog decribes how to install and setup jboss to start automatically on RedHat Linux

Step1: Install Java and set environment variables

Please follow this link for instructions

http://easylinuxstuffs.blogspot.com/2009/08/installing-java-on-linux.html

Step2: Create a user called jboss

It always advisable to create a user "jboss" that can be used to start/stop jboss and can be assign permissions

#useradd jboss

Step3: Download appropriate package from Jboss and Install it

#tar -xvxf jboss-5.1.0.GA-jdk6.zip

#mv jboss-5.1.0.GA /usr/local/

#chown -R jboss:jboss /usr/local/jboss-5.1.0.GA

Step4: Set Environment variables for JBOSS

Create a file /etc/profile.d/jboss

# touch /etc/profile.d/jboss

# chmod +x /etc/profile.d/jboss

#vi /etc/profile.d/jboss ( Add the following entries)

#***** Set Env Variables for Jboss

JBOSS_HOME=/usr/local/jboss-5.1.0.GA

export JBOSS_HOME

export PATH=$JBOSS_HOME/bin:$PATH

export LAUNCH_JBOSS_IN_BACKGROUND=1

Step5: Logout from shell to get the above path settings updated

Note: [Instead of creating /etc/profile.d/jboss we can always update the variables in /etc/profile]

Step6: Configure Jboss to script start automatically on restart

Starting from JBoss 4.0.1 and above a sample start-up script ( eq: jboss_init_redhat.sh for redhat) is supplied with the package , we just need to modify it

Copy the script to /etc/init.d and name it as jboss

#cp /usr/local/jboss-5.1.0.GA/bin/jboss_init_redhat.sh /etc/init.d/jboss

#chmod +x /etc/init.d/jboss

Step7: create links

The links will be used to identify at which run levels JBoss should be started and stopped.

#ln -s /etc/rc.d/init.d/jboss /etc/rc3.d/S84jboss

#ln -s /etc/rc.d/init.d/jboss /etc/rc5.d/S84jboss

#ln -s /etc/rc.d/init.d/jboss /etc/rc4.d/S84jboss

#ln -s /etc/rc.d/init.d/jboss /etc/rc6.d/K15jboss

#ln -s /etc/rc.d/init.d/jboss /etc/rc0.d/K15jboss

#ln -s /etc/rc.d/init.d/jboss /etc/rc1.d/K15jboss

#ln -s /etc/rc.d/init.d/jboss /etc/rc2.d/K15jboss

Linux will execute the equivalent of "service jboss start" for the "S" links and "service jboss stop" for the K links.

Red Hat has a chkconfig command to manage these links, which may or may not work (it uses comments in the top of the script to determine which run-levels it should be started/stopped in)

Step8: Modify the script to work with chkconfig command in Redhat

Add the following entries just after #!/bin/sh in the script

#

# JBoss Control Script

#

# chkconfig: 345 80 20

# description: JBoss Startup File

#

#

# To use this script run it as root - it will switch to the specified user

#

Step9: Modify the script with JJboss,JavaPath, User and Host details

Find out the following entries and change according to you installation directories and path

#define where jboss is - this is the directory containing directories log, bin, conf etc

JBOSS_HOME=${JBOSS_HOME:-"/usr/local/jboss-5.1.0.GA"}

#define the user under which jboss will run, or use 'RUNASIS' to run as the current user

JBOSS_USER=${JBOSS_USER:-"jboss"}

#make sure java is in your path

JAVAPTH=${JAVAPTH:-"/usr/java/jdk1.6.0_14/bin"}

#bind jboss services to a specific IP address - added by rasith

JBOSS_HOST=${JBOSS_HOST:-"yourserver.yourdomain.com"} Note:[Either give FQDN of your server or IP Address]

Step10: set chkconfig to start jboss in different runlevel

#chkconfig --level 345 jboss on

Step11: Start Jboss and Verify whether it is running properly

#/sbin/service jboss start

You should be able to see jboss up and running at http:://yourserver.yourdomain.com:8080

Use /sbin/service jboss start|stop|restart to start , stop and to restart jboss

Stept12: Restart your server and verify jboss is running automatically after the restart

Installing Java on Linux

This Post describes how to install and set pathvariable for java in linux

Step1: Get rpm packages for Java

Download appropriate package from http://java.sun.com/javase/downloads/index.jsp

Step2: Install Java

Make the downloaded bin file executable

#chmod +x jdk-6u14-linux-x64-rpm.bin

#./jdk-6u14-linux-x64-rpm.bin

By default java will get installed on /usr/java/ , in this case /usr/java/jdk1.6.0_14

Step3: Set Java_Home and add it to Path Variable

Create a file /etc/profile.d/java

# touch /etc/profile.d/java

# chmod +x /etc/profile.d/java

#vi /etc/profile.d/java

#***** Set Env Variables for Java

JAVA_HOME=/usr/java/jdk1.6.0_14

export JAVA_HOME

export PATH=$JAVA_HOME/bin:$PATH

Logout from shell to get this updated

Note: [ Instead of creating /etc/profile.d/java we can always update the variables in /etc/profile ]

Step4: Test the installation

# java -version

java version "1.6.0_14"

Java(TM) SE Runtime Environment (build 1.6.0_14-b08)

Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode)

Installing Apache2 on Linux

Step1: Get tar.gz packages for apache

Download appropriate package

#wget http://apache.mirror.facebook.net/httpd/httpd-2.2.11.tar.gz

Step2: Configure and Install Apache

#tar -xvxf httpd-2.2.11.tar.gz

# mv httpd-2.2.11 /usr/local/

#cd /usr/local/httpd-2.2.11

#./configure

#make

#make install

By default apache will install on /usr/local/apache2

Step3: Configure Apche to start automatically on reboot

# cp /usr/local/apache2/bin/apachectl /etc/init.d/httpd

Add the fllowing lines to /etc/init.d/httpd

#

# Startup script for the Apache Web Server

#

# chkconfig: - 85 15

# description: Apache is a World Wide Web server. It is used to serve

# HTML files and CGI.

# processname: httpd

# pidfile: /usr/local/apache/logs/httpd.pid

# config: /usr/local/apache/conf/httpd.conf

#

Then execute the below commands

# chmod 755 /etc/init.d/httpd

# chkconfig --add httpd

# chkconfig --level 35 httpd on

Note [ If you need a more detailed feedback we can use the below scrip as startup script]

#!/bin/bash

# httpd Startup script for the Apache HTTP Server

# chkconfig: 345 85 15

# description: Apache is a World Wide Web server. It is used to serve

# HTML files and CGI.

# processname: httpd

# config: /usr/local/apache2/conf/httpd.conf

# pidfile: /var/run/apache2.pid

# Source function library.

. /etc/rc.d/init.d/functions

# Start httpd in the C locale by default.

HTTPD_LANG=${HTTPD_LANG-"C"}

# This will prevent initlog from swallowing up a pass-phrase prompt if

# mod_ssl needs a pass-phrase from the user.

INITLOG_ARGS=""

# Path to the apachectl script, server binary, and short-form for messages.

apachectl=/usr/local/apache2/bin/apachectl

httpd=${HTTPD-/usr/local/apache2/bin/httpd}

prog=httpd

pidfile=${PIDFILE-/var/run/apache2.pid}

lockfile=${LOCKFILE-/var/lock/subsys/apache2}

RETVAL=0

start() {

echo -n $"Starting $prog: "

LANG=$HTTPD_LANG daemon $httpd $OPTIONS

RETVAL=$?

echo

[ $RETVAL = 0 ] && touch ${lockfile}

return $RETVAL

}

stop() {

echo -n $"Stopping $prog: "

killproc $httpd

RETVAL=$?

echo

[ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}

}

reload() {

echo -n $"Reloading $prog: "

if ! LANG=$HTTPD_LANG $httpd $OPTIONS -t >&/dev/null; then

RETVAL=$?

echo $"not reloading due to configuration syntax error"

failure $"not reloading $httpd due to configuration syntax error"

else

killproc $httpd -HUP

RETVAL=$?

fi

echo

}

# See how we were called.

case "$1" in

start)

start

;;

stop)

stop

;;

status)

status $httpd

RETVAL=$?

;;

restart)

stop

start

;;

condrestart)

if [ -f ${pidfile} ] ; then

stop

start

fi

;;

reload)

reload

;;

graceful|help|configtest|fullstatus)

$apachectl $@

RETVAL=$?

;;

*)

echo $"Usage: $prog {start|stop|restart|condrestart|reload|status|fullstatus|graceful|help|configtest}"

exit 1

esac

exit $RETVAL

Step4: Add path variabled if required

Create a file /etc/profile.d/apache2

# touch /etc/profile.d/apache2

# chmod +x /etc/profile.d/apache2

#vi /etc/profile.d/apache2

#***** Set Env Variables for Apche

APACHE_HOME=/usr/local/apache2

export APACHE_HOME

export PATH=$APACHE_HOME/bin:$PATH

Logout from shell to get this updated

End Of the Document

*******************************************

Courtesy: http://olex.openlogic.com

Configure VNC Server for Remote Desktop

Step1: Get packages for VNC

The server package is called 'vnc-server'. If the server is not installed, install it
#yum install vnc-server
The client program is 'vnc'. If is not installed, install it.
#yum install vnc

Step2: Create a user who can use VNC

#useradd zooz
Step3: Set password for VNC user
Logon as each user and create password for each user. This will create .vnc directory
# vncpasswd

Step4: Create xstartup scripts

We will create the xstartup scripts by running vncserver as root
# vncserver
This will start first vnc server instance ( We can run multiple vnc instances #vncserver :2 #vncserver :3 etc)
# vi .vnc/xstartup
# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc

Step5:Modify etc/sysconfig/vncservers

#vi /etc/sysconfig/vncservers
Add the vnc server entries
VNCSERVERS="1:root 2:zooz"
VNCSERVERARGS[1]="-geometry 1280x1024"
VNCSERVERARGS[2]="-geometry 1280x1024"

Step6: Configure VNC Server to start automatically on restart

#chkconfig vncserver on 345
# service vncserver restart


Cool , Its ready!!! We can now connect to the server; just install vnc client and access with any of the vnc server instances
Servername:1
Servername:2