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Cluster SSH opens terminal windows with connections to specified hosts and an administration console. Any text typed into the administration console is replicated to all other connected and active windows. This tool is intended for, but not limited to, cluster administration where the same configuration or commands must be run on each node within the cluster. Performing these commands all at once via this tool ensures all nodes are kept in sync.

Introduction

What is ClusterSSH and what is it used for?

Ever had to make the same change on more than one Linux/unix server? Find it annoyingly painful to keep repeating the exact same commands again and again and again?

This tool addresses exactly this problem. You run a utility (cssh) providing a number of server names as parameters, and then xterms opens up to each server with an extra “console” window. Anything typed into the console is replicated into each server window (so, for examples, you can edit the same file on N machines at the same time, or run the same commands with the same parameters across those servers).

It is also possible to type into the server windows directly, or temporarily disable replication to one or more of the servers through the “Hosts” menu.

Difference between ClusterSSH and “cssh”

The utility itself is called “cssh”. The project name is ClusterSSH. The project is not called “cssh” because when the project was first registered on SourceForge a project already existed using that name (”C sharp” unix shell).

Install cluster ssh on debian

#apt-get install clusterssh

Configuration Files

This /etc/clusters file is cluster tag database. Contains a list of tags and hostnames, in the form

<tag> [<username>@]hostname [...]

Newlines and comments (delimited with a #) are ignored.

Cluster definitions can also be added to the $HOME/.csshrc file

This /etc/csshrc file is Global configuration file, sourced by all users. Can be generated by:

cssh -u > /etc/csshrc

$HOME/.csshrc

Per user configuration file. Can be generated by:

cssh -u > /etc/csshrc</tt>

To add a cluster definition to this file, use the following format

cluster_tag1 = server1 server2 user@server3
cluster_tag2 = server4 server5
clusters = cluster_tag1 cluster_tag2

Be aware of using “reserved names” and no check is currently performed for them.

Using Cluster SSH

If you want to perform the same command on the three servers one, two, & three use the following command

# cssh one two three

This will open three consoles, one for each server, over an ssh connection, and one little console to type your command.

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Eclipse is an open source community whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle. A large and vibrant ecosystem of major technology vendors, innovative start-ups, universities, research institutions and individuals extend, complement and support the Eclipse platform.

Installing Eclipse,Sun Java in Ubuntu

sudo apt-get install eclipse sun-java6-jdk

This will install the required packages, however, Eclipse will run very slowly since it will be using GNU’s java, not Sun’s. We now need to make Sun’s java the default.

sudo update-java-alternatives -s java-6-sun

Next, edit the JVM configuration file

sudo -b gedit /etc/jvm

and add the following to the top of the file

/usr/lib/jvm/java-6-sun

There is a bug right now were Eclipse ignores Ubuntu’s java-common settings and uses its own (bug 45347). To work around the bug, you need to edit Eclipse’s java_home file

sudo -b gedit /etc/eclipse/java_home

and add

/usr/lib/jvm/java-6-sun

to the top of the file.

Lastly, if you have lots of memory you may want to increase the heap size (warning: If you make the heap size too large then parts of eclipse will continuously swap in and out.).The settings can be altered by editing the eclipse.ini file.

For feisty users:

sudo -b gedit /usr/lib/eclipse/eclipse.ini

The argument Xms refers to the minimum heap size and Xmx refers to the maximum heap size.

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Apache Tomcat is a web container, or application server developed at the Apache Software Foundation (ASF). Tomcat implements the servlet and the JavaServer Pages (JSP) specifications from Sun Microsystems, providing an environment for Java code to run in cooperation with a web server. It adds tools for configuration and management but can also be configured by editing configuration files that are normally XML-formatted. Tomcat includes its own internal HTTP server.

First Sun JDK 5 need to be installed. It can be installed from Debian repository with unstable software

First you need to edit /etc/apt/sources.list file

#vi /etc/apt/sources.list

Add the following lines

# for sun-java packages in unstable
deb http://ftp.debian.org/debian/ unstable non-free
deb-src http://ftp.debian.org/debian/ unstable non-free

Save and exit the file.

Now you need to Update apt using the following command

#apt-get update

Install jdk using the following command

#apt-get install sun-java5-jdk

Check the java version using the following command

#java -version

Output looks similar to the following

java version “1.5.0_10″
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
Java HotSpot(TM) Client VM (build 1.5.0_10-b03, mixed mode, sharing)

Installing Apache Tomcat

Install Tomcat using the following commands

#apt-get install tomcat5.5
#apt-get install tomcat5.5-admin
#apt-get install tomcat5.5-webapps

To verify that Tomcat is running just navigate to http://localhost:8180/ in your browser (make sure you have replaced ‘localhost’ with your server ip or name)

You can start/stop or restart Tomcat using following command:

#/etc/init.d/tomcat5.5 [start | stop | restart]

Configuring ‘admin’ and ‘manager’ applications

You need to configure some user to have admin and manager roles. For example you can do it with ‘tomcat’ user. Stop server using the following command.

#/etc/init.d/tomcat5.5 stop

Now you need to edit /var/lib/tomcat5.5/conf/tomcat-users.xml file to look like below

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
<role rolename="admin"/>
<role rolename="manager"/>
<role rolename="tomcat"/>
<user username="tomcat"
password=”tomcatpassword”
roles="tomcat,admin,manager"/>
</tomcat-users>

Save and exit the file.

Start tomcat using the following command

#/etc/init.d/tomcat5.5 start

Now you can use manager application at http://localhost:8180/manager/html.
Your user will be ‘tomcat’ and password will be ‘tomcatpassword’

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Apache Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process.

Apache Tomcat is developed in an open and participatory environment and released under the Apache Software License. Apache Tomcat is intended to be a collaboration of the best-of-breed developers from around the world. We invite you to participate in this open development project. To learn more about getting involved, click here.

Apache Tomcat powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations.

Download the latest Tomcat to your desktop: http://tomcat.apache.org/, then run

sudo tar zxvf apache-tomcat-6.0.10.tar.gz

sudo cp -R apache-tomcat-6.0.10 /usr/share/tomcat6

Setting JAVA environment

Download the latest J2SE SDK, and run

sudo chmod +x *.bin

sudo sh ./jdk*.bin

Executing the .bin file creates a folder on your desktop named jdk1.6.0_01. Rename that folder to Java6u1. Now move that folder to /usr/lib

sudo mv Java6u1 /usr/lib

sudo update-alternatives --install /usr/bin/java java /usr/lib/Java6u1/bin/java 300

sudo update-alternatives --config java

1 /usr/lib/Java6u1/bin/java
2 /usr/bin/gij-wrapper-4.1
3 /usr/lib/jvm/java-gcj/jre/bin/java

Select 1

Setting the following environment

Edit /etc/environment

gedit /etc/environment, then insert and save two lines

CLASSPATH=.:/usr/lib/Java6u1/bin
JAVA_HOME=/usr/lib/Java6u1

Tomcat needs to set JAVA_HOME or JRE_HOME to execute. Open the follow document and edit the lines

sudo gedit ~/.bashrc

then place the following lines in

export JAVA_HOME=/usr/lib/Java6u1
export PATH=$PATH:$JAVA_HOME/bin

Start and stop tomcat

Now start your tomcat: sudo /usr/share/tomcat6/bin/./startup.sh

Type http://localhost:8080 in your browser. If you see the tomcat welcome page, your tomcat is running smoothly. If you are installing below 5.5 version, please try 8180.

Stopping tomcat: sudo /usr/share/tomcat6/bin/./shutdown.sh

Tomcat administrator setting

Edit this document:

sudo gedit /usr/share/tomcat6/conf/tomcat-users.xml

before </tomcat-users> insert this line

<user username="your username" password="your password" roles="admin,manager"/>

Save and restart your tomcat. You can login to your tomcat admin by using your new set id and password now.

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