Eucalyptus EE2, Centos 5.5×64, VmWare ESXi 4.0, OpenEucalyptus

Posted October 28, 2010 by hackdaddy
Categories: CentOS 5.3, Eucalyptus, Eucalyptus, Virtualization, VmWare

This is my implementation of Eucalyptus Enterprise Edition 2 with Centos, ESXi4 and OpenEucalyptus.  Okay so the NAO robot isn’t a part of the project but it was a nice addition don’ t ya think.

 

Comments: 4 Comments

Cloud Computing Again : Ubuntu x86_64 (Jaunty) and Eucalyptus v1.5.1x86_64

Posted July 13, 2009 by hackdaddy
Categories: Eucalyptus, Eucalyptus, Ubuntu 9.04 (Jaunty)

So, weak on linux skills and you want to build a cloud.  Well do I have the thing for you.  Ubuntu x64 9.04 Jaunty/Eucalyptus v1.5.1x86_64 Cloud. see:  http://www.ubuntu.com/products/whatisubuntu/serveredition/cloud/UEC

Here is another example of  my development and deployment of a Cloud Computing Cluster with Jaunty.  This is a Intel Core 2 Quad-Core HeadNode and Compute Nodes.  Please read this entire tutorial first because you may just need to run a script that would handle some configurtions.

Requirements (for 1 headnode and 2 compute node environment)

Intel or AMD Hyper-V Compatible multicore Processors x86_64

4gb + RAM

100 gb harddrive (/export mount point and / (root) must be atleast 40 gb)

HeadNode: Must have 2 network interface card (preferably gigabit ethernet)

ComputeNode: At Least 1 gigabit ethernet card

Gigabit Ethernet Switch

Resources:

  • Ubuntu9.04 (Jaunty)  x86_64 CD Set all discs (replace the Rocks OS set all Centos Discs)
  • Eucalyptus v1.5.1 x86_64 (Get the generic package)

Components (some of these will be added as a part of the Rocks implementation)

  • Package manager (Yum, Apt , RPM (synaptic or up2date optional))
  • DHCP Server (dhcp3)
  • Xen 3+ ( I recommend Xen 3.4)
  • libvirt 6+
  • Python 5 (not 6)
  • Perl 1.8.5+
  • Java 6+ (OpenJDK)
  • Apache 1.6+ ( I used 1.7.1)
  • rsync
  • Firewall (iptables, ufw – uncomplicated firewall)
  • sshd
  • Text Editor (nano, kedit, gedit)
  • KVM
  • Qemu
  • vlan
  • sendmail
  • iproute
  • ntp
  • bridge-utils
  • vblade
  • aoetools
  • lvm2
  • nmap (to see what’s running on open ports)
  • wget
  • unzip
  • Eucalyptus 1.5.1 (eucalyptus-1.5.1-ubuntu-amd64.tar.gz)
  • Sample Image (euca-ttylinux.tgz, )
  • ec2-api-tools-1.3-30349
  • ec2-ami-tools-1.3-26357

Configurations

check if hyper-v or paravirtualization compatible if no output not compatible:

Check on Physical Address Extensions – grep pae /proc/cpuinfo

Check Intel-VT or AMD-V for hardware virtualization.

Intel

grep vmx /proc/cpuinfo

AMD

grep svm /proc/cpuinfo

open ports: Headnode =  22, 25, 80, 443, 5900, 5901,8443, 8773, 8774
ComputeNode = 8775

also 5900, 5901 if you want to use vncviewer/vncserver there is also a

remote desktop utility for Centos, I believe vino.

Be sure selinux is disabled.

Use SYSTEM managed or default Networking configuration.

Instructions assume that you understand how to use linux and text editors.  Also assumes that you understand networking, virtual machines and system configuration. Please do the configurations logged in with a root account. Please connect eth0 on internal lan to switch plus the nodes and eth1 on public wan.  Be sure that the compute nodes can boot from network cards (PXE boot).

Ubuntu 9.04 Setup with Eucalyptus

Thursday, June 04, 2009

Sun Ultra24 

Intel Quad Core Q9300 @ 2.5GHz

4gb ram

250 gb sata HDD

1 embedded intel Gigabit NIC (eth0)

1 intel pro 100 100 Megabit NIC (eth1)

Materials:

Ubuntu 9.04 Server from http://www.ubuntu.com/getubuntu/download-server

Requirements:

Email server

DHCP Server

GUI (on frontend or headnode) – gnome no recommendations

Network Configuration

Private IP 10.1.1.1

Subnet       255.0.0.0

DNS          10.1.1.1

Gateway   10.1.1.1

SYSTEN (HOSTNAME): SPSUITCLOUD

DOMAIN                        : SPSU.EDU

username: spsucloud

password: temp

DHCP Server on Ubuntu http://www.unix-tutorials.com/go.php?id=3938

MAC Address

This method entails using DHCP to identify the unique hardware address of each network card connected to the network and then continually supplying a  constant configuration each time the DHCP client makes a request to the DHCP server using that network device.

Install DHCP server in ubuntu

sudo apt-get install dhcp3-server

This will complete the installation.

Configuring DHCP server

If you have two network cards in your ubuntu server you need to select which interface you want to use for  DHCP server listening.By default it listens to eth0.

You can change this by editing  /etc/default/dhcp3-server file

sudo vi /etc/default/dhcp3-server

Find this line

INTERFACES=”eth0″

Replace with the following line

INTERFACES=”eth1″

Save and exit.This is optional.

Next you need to make a backup copy of /etc/dhcp3/dhcpd.conf file

cp /etc/dhcp3/dhcpd.conf /etc/dhcp3/dhcpd.conf.back

Edit /etc/dhcp3/dhcpd.conf file using the following command

sudo vi /etc/dhcp3/dhcpd.conf

Using address pool method

You need to change the following sections in /etc/dhcp3/dhcpd.conf file

default-lease-time 600;
max-lease-time 7200;

option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.254;
option domain-name-servers 192.168.1.1, 192.168.1.2;
option domain-name “yourdomainname.com”;

subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.10 192.168.1.200;
}

save and exit the file

This will result in the DHCP server giving a client an IP address from the range 192.168.1.10-192.168.1.200 . It will lease an IP address for 600 seconds if the client doesn’t ask for a specific time frame. Otherwise the maximum (allowed) lease will be 7200 seconds. The server will also “advise” the client that it should use 255.255.255.0 as its subnet mask, 192.168.1.255 as its broadcast address, 192.168.1.254 as the router/gateway and 192.168.1.1 and 192.168.1.2 as its DNS servers.

Using MAC address method

This method is you can reserver some of the machines or all the machines with fixed ip address.In the following example i am using fixed ip address for server1,server2,printer1 and printer2

default-lease-time 600;
max-lease-time 7200;

option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.254;
option domain-name-servers 192.168.1.1, 192.168.1.2;
option domain-name “yourdomainname.com”;

subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.10 192.168.1.200;
}

host server1 {
hardware ethernet 00:1b:63:ef:db:54;
fixed-address 192.168.1.20;
}

host server2 {
hardware ethernet 00:0a:95:b4:d4:b0;
fixed-address 192.168.1.21;
}

host printer1 {
hardware ethernet 00:16:cb:aa:2a:cd;
fixed-address 192.168.1.22;
}

host printer2 {
hardware ethernet 00:0a:95:f5:8f:b3;
fixed-address 192.168.1.23;
}

Now you need to restart dhcp server using the following command

sudo /etc/init.d/dhcp3-server restart

Configure Ubuntu DHCP Client

If you want to configure your ubuntu desktop as DHCP client following this procedure

You need to open /etc/network/interfaces file

sudo vi /etc/network/interfaces

make sure you have the following lines (eth0 is an example)

auto lo eth0
iface eth0 inet dhcp
iface lo inet loopback

Save and exit the file

You need to restart networking services using the following command

sudo /etc/init.d/networking restart

How to find DHCP server IP address

You need to use the following commands

sudo dhclient

or

tail -n 15 /var/lib/dhcp3/dhclient.*.leases

Share internet connection on ubuntu. http://ubuntuforums.org/showthread.php?t=91370

Share internet connection through ubuntu.  So that node machines can get access to internet through head node.

1. Start by configuring the network card that interfaces to the other computers on you network:

# ifconfig ethX ip

where ethX is the network card and ip is your desired server ip address (Usually 192.168.0.1 is used)

2. Then configure the NAT as follows:

# iptables -t nat -A POSTROUTING -o ethX -j MASQUERADE

where ethX is the network card that the Internet is coming from

# echo 1 > /proc/sys/net/ipv4/ip_forward

3. Install dnsmasq and ipmasq using apt-get:

# apt-get install dnsmasq ipmasq

4. Restart dnsmasq:

# /etc/init.d/dnsmasq restart

5. Reconfigure ipmasq to start after networking has been started:

# dpkg-reconfigure ipmasq

6. Repeat steps 1 and 2.

7. Add the line “net.ipv4.ip_forward = 1″ to /etc/sysctl.conf

# gedit /etc/sysctl.conf

8. Reboot. (Optional)

I hope this helps.

Good luck!

Eucalyptus Installation on Ubuntu 9.04

https://help.ubuntu.com/community/Eucalyptus

Tips*

Configure dhcp on a nic.

In:

/etc/network/interfaces

auto eth1

iface eth1 inet dhcp

Restart network

sudo /etc/init.d/networking restart

GUI installation

Install Gui Interface http://www.ubuntugeek.com/install-gui-in-ubuntu-server.html

Enable universe and multiverse

/etc/apt/sources.list

Gnome

Weak of heart: sudo apt-get install ubuntu-desktop

Lion heart: sudo aptitude  install --no-install-recommends ubuntu-desktop

Xfce

sudo apt-get install xubuntu-desktop

KDE

sudo apt-get install kubuntu-desktop

see also sudo apt-get install xserver-xorg-video-nv

sudo apt-get install gnome

How to get command line in Ubuntu

tty1 (ctrl+alt+F1)

FTP Sever Setup

http://www.cyberciti.biz/faq/ubuntu-vsftpd-ftp-service-server/

http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch15_:_Linux_FTP_Server_Setup

Useful Command options

- CTRL+ALT+F1 (session)
- CTRL+ALT+F2 (free tty)
- CTRL+ALT+F7 (GUI)
- CTRL+ALT+F8 (control)

POSTFIX mail

https://help.ubuntu.com/community/PostfixBasicSetupHowto

Quadro FX 370 drivers

http://www.nvidia.com/object/linux_display_amd64_180.60.html

http://us.download.nvidia.com/XFree86/Linux-x86_64/180.60/NVIDIA-Linux-x86_64-180.60-pkg2.run

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Cloud Computing : Centos 5.3x86_64+Rocks V.Ix86_64 and Eucalyptus v1.5.1x86_64

Posted July 7, 2009 by hackdaddy
Categories: CentOS 5.3

So, you want to build a Rocks/Centos(RedHat Enterprise)/Eucalyptus Cloud

Here is an example of my development and deployment of a Cloud Computing Cluster using Centos5.3x86_64, Rock V.Ix86_64 and Eucalyptus v1.5.1x86_64 on a AMD Opteron Dual x64 / HeadNode and Intel Core 2 Quad-Core / Compute Nodes. Please read this entire tutorial first because you may just need to run a script that would handle some configuration.

Requirements: (for 1 headnode and 2 compute node environment)

Intel or AMD Hyper-V Compatible multicore Processors x86_64

4gb + RAM

100 gb harddrive (/export mount point and / (root) must be atleast 40 gb)

HeadNode: Must have 2 network interface card (preferably gigabit ethernet)

ComputeNode: At Least 1 gigabit ethernet card

Gigabit Ethernet Switch

Resources:

  • Rocks V.I x86_64 CD Set (Kernel/Boot Roll, Base Roll, WebServer Roll, Ganglia Roll)
  • CentOS 5.3 x86_64 CD Set all discs (replace the Rocks OS set all Centos Discs)
  • Eucalyptus v1.5.1 x86_64 (Get the generic package)

Components (some of these will be added as a part of the Rocks implementation)

  • Package manager (Yum, Apt , RPM (synaptic or up2date optional))
  • DHCP Server (dhcp3)
  • Xen 3+ ( I recommend Xen 3.4)
  • libvirt 6+ (the install comes with libvirt 3, plus there are issue with the one in the package on centos)
  • Python 5 (not 6)
  • Perl 1.8.5+
  • Java 6+
  • Apache 1.6+ ( I used 1.7.1)
  • rsync
  • Firewall (iptables)
  • sshd
  • Text Editor (nano, kedit, gedit)
  • KVM
  • Qemu
  • vlan
  • sendmail
  • iproute
  • ntp
  • bridge-utils
  • vblade
  • aoetools
  • lvm2
  • nmap (to see what’s running on open ports)
  • wget
  • unzip
  • Eucalyptus 1.5.1 (eucalyptus-1.5.1-centos-x86_64.tar.gz)
  • Sample Image (euca-ttylinux.tgz)
  • ec2-api-tools-1.3-30349
  • ec2-ami-tools-1.3-26357

Configurations

check if hyper-v or paravirtualization compatible if no output not compatible:

Check on Physical Address Extensions – grep pae /proc/cpuinfo

Check Intel-VT or AMD-V for hardware virtualization.

Intel

grep vmx /proc/cpuinfo

AMD

grep svm /proc/cpuinfo

open ports: Headnode =  22, 25, 80, 443, 5900, 5901,8443, 8773, 8774
ComputeNode = 8775

also 5900, 5901 if you want to use vncviewer/vncserver there is also a

remote desktop utility for Centos, I believe vino.

Be sure selinux is disabled.

Use SYSTEM managed or default Networking configuration.

Instructions assume that you understand how to use linux and text editors.  Also assumes that you understand networking, virtual machines and system configuration. Please do the configurations logged in with a root account. Please connect eth0 on internal lan to switch plus the nodes and eth1 on public wan.  Be sure that the compute nodes can boot from network cards (PXE boot). * Don’t forget to turn off PXE Boot after you have installed a vm-container-X-X.

First: Install the headnode by using the rocks documentation (Please Read entirely). You will need to begin by inserting your boot/kernel roll. Then type <build> (omit any < > seen in this tutorial, unless stated otherwise)  Follow Rocks Documentation however replace the OS Rolls with the entire CD set for CentOS 5.3 x86_64. Record your information but keep it secure, normally the defaults are sufficient.

Plan your network configuration: I put a 192.168.42.95 for my static ip on eth1 (public wan) because this is in my network configuration talk to your network admin and get your info you will need the dns and gateway.  I put 10.1.1.1 on eth0 (cloud lan) because this is what I want. If it recommends a default use it.

Use manual partition for the system with atleast:

Use ext3 file system.

40 gb / (force primary)

Ram * 3 swap (force primary)

40 gb /export

the rest if necessary as you see fit.  By followng rocks documentation install should go by smoothly. Reboot into Rocks/Centos.

Share internet on compute nodes through your head node.  You can put the following in a shell script and run it change your configurations to match your own.

linux-network-share.sh

#!/bin/bash
# Created by nixCraft – www.cyberciti.biz
# Edited by Micah Rowland
IPT=”/sbin/iptables”
MOD=”/sbin/modprobe”

# set wan interface such as eth1 or ppp0
SHARE_IF=”eth1″

# clean old fw
echo “Clearing old firewall rules…”
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT

# Get some kernel modules
echo “Loading kernel modules…”
$MOD ip_tables
$MOD iptable_filter
$MOD iptable_nat
$MOD ip_conntrack
$MOD ipt_MASQUERADE
$MOD ip_nat_ftp
$MOD ip_nat_irc
$MOD ip_conntrack_ftp
$MOD ip_conntrack_irc

# Clean old rules if any, rhel specific but above will take care of everything
# service iptables stop

# unlimited traffic via loopback device
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A OUTPUT -o lo -j ACCEPT

echo “Setting ${SHARE_IF} as router interface…”
$IPT –table nat –append POSTROUTING –out-interface ${SHARE_IF} -j MASQUERADE

# Start other custom rules
#$IPT
# End other custom rules

echo “*** Instructions on TCP/IP On The Windows / Mac / Linux Masqueraded Client ***”
echo “1. Login to your other LAN node computers”
echo “2. Use a text editor to modify your network setting with the info below modified
for your network.”
echo “3. Set DNS (NS1 and NS2) to 192.168.43.80 and 192.168.43.81″
echo “4. Create a route-eth0 file in /etc/sysconfig/network-scripts with appropriate permissions”
echo “5. Enter $(ifconfig ${SHARE_IF} | grep ‘inet addr:’| grep -v ’127.0.0.1′ | cut -d: -f2 | awk ‘{ print $1}’) as the default gateway.”

This adds a router for each subnet.
It goes <subnet> via <gateway> dev <device>. Here is my route-eth0 file. change yours accordingly.
# Added by Micah 7/7/09
default 10.1.1.1 dev eth0
10.1.0.0/24 via 10.1.1.1 dev eth0
192.168.42.0/24 via 192.168.42.95 dev eth0
192.168.0.0/24 via 192.168.122.1 dev eth0

Second: Let’s begin by configuring our package managers. We will be adding apt support considering most of the documentation is written in hopes of using Ubuntu 9.04 Server

In your yum.conf file enter this:
[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag
#baseurl=http://ftp.riken.jp/Linux/dag/redhat/el$releasever/en/$basearch/dag
gpgcheck=1

then run:

rpm –import http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
rpm –import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt

Then get the following repo file and add them here: /etc/yum.repos.d

CentOS-GITCO.repo

CentOS-GITCO_TESTING.repo

Now, yum install apt

After installation update the os.list file for apt for your CentOS Distro found here: /etc/apt/sources.list.d

edit os.list and add:

### CENTOS
repomd http://mirror.centos.org/ centos/$(VERSION)/os/$(ARCH)
repomd http://mirror.centos.org/ centos/$(VERSION)/updates/$(ARCH)
repomd http://mirror.centos.org/ centos/$(VERSION)/extras/$(ARCH)

also, uncomment any centos or redhat enterprise lines within reason. Modification may be needed. Please google.

I don’t update, but if you don’t have the version I mentioned above please update til you do. Please review the update components also.

Third: Eucalyptus pre-requisites. Now I used java.sun binary install for java 6 and apache foundation for ant 1.7.1 but Euclyptus team feels you should do this if using rocks then remove the <-y> cause you may have conflicts:

yum install -y java-1.6.0-openjdk-devel ant ant-nodeps libvirt-devel
curl-devel httpd httpd-devel apr-devel openssl-devel dhcp

This may not be necessary because you used rocks, but remember not to get rocks confused with what you are doing here which is a eucalyptus cloud, not rocks cluster, because you want the amazon tools.  Try it couldn’t hurt.

Fourth: Installation of Eucalyptus

Verify all node clocks are synchronized with ntp.  Verify all required ports previously mentioned are open, Headnode = 22, 25, 80, 443, 5900, 5901, 8443, 8773, 8774 ComputeNode = 8775.  This can be done through iptables or use the utility in Centos unders: System > Administration > Security Level and Firewall.  Since the Compute nodes have no gui then do the iptables commands. see iptables or google or try. Later we will do dns masquerading so that your compute nodes get internet access.  So, you may want to revisit this later to add a new rule.

/etc/sysconfig/iptables (verify you iptables file it may be different than this one)

iptables -I INPUT -p tcp –dport 8775 –syn -j ACCEPT

/etc/rc.d/init.d/iptables restart

Verify Xen get’s network connectivity on the compute nodes by manual loading a xen image.  Please see xen documentation or google.

All downloads should be in your /opt directory. Now run:

tar zxvf eucalyptus-1.5.1-*.tar.gz
cd eucalyptus-1.5.1-*

then

go into the created directory eucalyptus-1.5.1-* and go into deps
directory and run the rpms. Before running the deps or eucalyptus,
If you are upgrading or had a different version installed please see
the documentation at open.eucalyptus.com. Or is you installed a Eucalyptus roll.

Run your rpm’s in order such as dependencies then libraries.  see eucalyptus documentation.

In your /opt directory run:

unzip ec2-api-tools-1.3-30349.zip

unzip ec2-ami-tools-1.3-26357.zip

Fifth: Add your System Paths for Eucalyptus to access resources.  You add this to the end of the /etc/profile or /etc/bashrc file. Like so:

export JAVA_HOME=/usr/java/jdk1.6.0_14
export EC2_HOME=/opt/ec2-api-tools-1.3-30349
export EC2_AMITOOL_HOME=/opt/ec2-ami-tools-1.3-26357
export EUCALYPTUS=/opt/eucalyptus
export PATH=$PATH:$HOME/.euca:$EUCALYPTUS:$JAVA_HOME/bin:/opt/apache-ant-1.7.1/bin:$EC2_HOME/bin:$EC2_AMITOOL_HOME/bin

Reference Links:

Rocks Documentation – http://www.rocksclusters.org/wordpress/?page_id=4

LinuxStreet – http://www.linuxstreet.net/news/E/19987/Install-Xen-3-3-on-CentOS-5-2-via-http-www-gitco-de-repo-xen3-3-0.html

Eucalyptus Doc – http://open.eucalyptus.com/wiki/EucalyptusPrerequisites_v1.5

Field Commander Wieers – http://dag.wieers.com/blog/using-apt-in-an-rpm-world

Gitco – http://www.gitco.de/linux/x86_64/centos/5/

CentOS / Redhat Linux Internet Connection Sharing – http://www.cyberciti.biz/faq/rhel-fedora-linux-internet-connection-sharing-howto/

Trouble Shoot and Support – http://forum.eucalyptus.com/forum/ (must sign up)

Downloads for this tutorial only.

wget http://s3.amazonaws.com/ec2-downloads/ec2-api-tools-1.3-30349.zip

wget http://s3.amazonaws.com/ec2-downloads/ec2-ami-tools-1.3-26357.zip

Eucalyptus v1.5.1x86_64 Centos 5.3 – http://open.eucalyptus.com/downloads/90

euca-ttylinux – http://open.eucalyptus.com/downloads/3

Comments: 4 Comments

How to enable compiling Java from windows shell …

Posted April 1, 2006 by hackdaddy
Categories: Java

Go to Start >> Run >> Type cmd or command.com

Type from the windows shell.

java -version.

Should see something like…

C:\>java -version
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

This would tell us that java is on your machine.

Know let's see why the program can't compile.

type javac… you should see something like this.

C:\>javac
Usage: javac <options> <source files>
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are us
ed
-classpath <path> Specify where to find user class files
-sourcepath <path> Specify where to find input source files
-bootclasspath <path> Override location of bootstrap class files
-extdirs <dirs> Override location of installed extensions
-d <directory> Specify where to place generated class files
-encoding <encoding> Specify character encoding used by source files
-source <release> Provide source compatibility with specified release
-target <release> Generate class files for specific VM version
-help Print a synopsis of standard options

If not then check the path of your environmental variables. And confirm that the path to your java resources are available. Like this …

C:\>path

PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBEM;C:\J2SDK1~1.2_0\bin
;C:\PROGRA~1\MI6841~1\80\Tools\Binn\;C:\MySQL\bi

Note the path C:\J2SDK1~1.2_0\bin which is the location of my java resources.

You can do this for your current windows shell by doing the following command. **Note: this will remove other resources from the path but we are just trying to compile java. You can set this permanently by doing it through system properties. I will tell you how when I figure how to put images up on wordpress. **

C:\>set Path=C:\J2SDK1~1.2_0\bin

C:\>

Then type java -version …

C:\>java -version
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

Then type javac …

C:\>javac
Usage: javac <options> <source files>
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are us
ed
-classpath <path> Specify where to find user class files
-sourcepath <path> Specify where to find input source files
-bootclasspath <path> Override location of bootstrap class files
-extdirs <dirs> Override location of installed extensions
-d <directory> Specify where to place generated class files
-encoding <encoding> Specify character encoding used by source files
-source <release> Provide source compatibility with specified release
-target <release> Generate class files for specific VM version
-help Print a synopsis of standard options

Your ready to compile and run java code.

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