Install Hamachi on Ubuntu 9.04

1. To being we must install the ‘tun’ module to enable IP Tunneling support for the Linux kernel. Most do not have this setup by default.

$ sudo modprobe tun

2. Open the modules file and add ‘tun’ to the list

$ sudo nano /etc/modules

3. Your file should look similar to the example below.

# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.

lp
rtc
tun

4. Save the file and exit out of nano (Ctrl-O to save & Ctrl-X to exit), lets move on and verify that a tunneling node has been created. (*If you have compiled your own kernel you likely need to recompile it with IP Tunneling support if you receive an error with modprobe. This is not covered in this guide. And if you are unsure, you most likely did not compile yourself and you would definitely remember doing so.)

$ ls /dev/net/tun

5. You should recieve a response like the example below

/dev/net/tun

6. If you received something along the lines of “No Such File or Directory” you may need to manually create the node in step 6. If you received the same response as I did, jump to step 7.

   $ sudo mkdir /dev/net
   $ sudo mknod /dev/net/tun c 10 200

   Jump back to Step 4 and you should now receive the correct response.

7. With our IP Tunnel node created, it is time to install Hamachi itself. First download the latest version. As of writing this guide, the latest version is 0.9.9.9-20

$ wget http://files.hamachi.cc/linux/hamachi-0.9.9.9-20-lnx.tar.gz

Expected output below

--2009-07-31 20:28:25--  http://files.hamachi.cc/linux/hamachi-0.9.9.9-20-lnx.tar.gz
Resolving files.hamachi.cc... 69.25.20.50
Connecting to files.hamachi.cc|69.25.20.50|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 344866 (337K) [text/plain]
Saving to: `hamachi-0.9.9.9-20-lnx.tar.gz'

100%[====================================================================>] 344,866      448K/s   in 0.8s

2009-07-31 20:28:26 (448 KB/s) - `hamachi-0.9.9.9-20-lnx.tar.gz' saved [344866/344866]

8. Extract our newly downloaded archive

$ tar zxvf hamachi-0.9.9.9-20-lnx.tar.gz

Expected output below

hamachi-0.9.9.9-20-lnx/
hamachi-0.9.9.9-20-lnx/Makefile
hamachi-0.9.9.9-20-lnx/LICENSE
hamachi-0.9.9.9-20-lnx/README
hamachi-0.9.9.9-20-lnx/LICENSE.tuncfg
hamachi-0.9.9.9-20-lnx/LICENSE.openssh
hamachi-0.9.9.9-20-lnx/LICENSE.openssl
hamachi-0.9.9.9-20-lnx/hamachi
hamachi-0.9.9.9-20-lnx/tuncfg/
hamachi-0.9.9.9-20-lnx/tuncfg/Makefile
hamachi-0.9.9.9-20-lnx/tuncfg/tuncfg.c
hamachi-0.9.9.9-20-lnx/tuncfg/tuncfg
hamachi-0.9.9.9-20-lnx/CHANGES

9. Navigate into the extracted directory

$ cd hamachi-0.9.9.9-20-lnx/

10. Start the installation

$ sudo make install

Expected output below

Copying hamachi into /usr/bin ..
Creating hamachi-init symlink ..
Compiling tuncfg ..
Copying tuncfg into /sbin ..

Hamachi is installed. See README for what to do next.

11. Run the tunnel

$ sudo tuncfg

12. This should complete the install, we will now configure the user permission in order for it to run correctly. Create a ‘hamachi’ user group

$ sudo groupadd hamachi

13. Add youself as a user to the ‘hamachi’ group. Be sure to replace your user name where appropriate.

$ sudo gpasswd -a YOURUSERNAME hamachi

14. Add the root user to the ‘hamachi’ group

$ sudo gpasswd -a root hamachi

15. Set the correct permissions for the tuncfg socket

$ sudo chmod 760 /var/run/tuncfg.sock

16. Change the ownership of the socket file

$ sudo chgrp hamachi /var/run/tuncfg.sock

17. That should do it for the permissions, Now onto setting Hamachi up & configuring it to start as a system service.

$ sudo hamachi-init -c /etc/hamachi

Expected output

Initializing Hamachi configuration (/etc/hamachi). Please wait ..

generating 2048-bit RSA keypair .. ok
making /etc/hamachi directory .. ok
saving /etc/hamachi/client.pub .. ok
saving /etc/hamachi/client.pri .. ok
saving /etc/hamachi/state .. ok

Authentication information has been created. Hamachi can now be started with
'hamachi start' command and then brought online with 'hamachi login'.

18. Start hamachi

$ sudo hamachi -c /etc/hamachi start

Expected output

Starting Hamachi hamachi-lnx-0.9.9.9-20 .. ok

19. Set your computer’s nickname

$ sudo hamachi -c /etc/hamachi set-nick "COMPUTERNICKNAME"

20. Login to the Hamachi network

$ sudo hamachi -c /etc/hamachi login

21. To join an existing network (optional) “NETWORKNAME” and “PASSKEY” should be replaced with your network name and network password

$ sudo hamachi -c /etc/hamachi join NETWORKNAME PASSKEY

22. To create a new network (optional) “NETWORKNAME” and “PASSKEY” should be replaced with your network name and network password

$ sudo hamachi -c /etc/hamachi create NETWORKNAME PASSKEY

23. If you joined an existing network you must tell hamachi to then “go-online”. Be sure to replace NETWORKNAME with your relevant network name.

$ sudo hamachi -c /etc/hamachi go-online NETWORKNAME

24. Check your hamachi status to verify everything is as it should be

$ sudo hamachi -c /etc/hamachi

Expected output

Hamachi, a zero-config virtual private networking utility, ver 0.9.9.9-20

version  : hamachi-lnx-0.9.9.9-20
pid      : 5472
status   : logged in
nickname : JauntyVM

Ubuntu Linux Install Sun Java Development Kit ( JDK ) and Java Runtime Environment ( JRE )

Q. How do I install Sun Java Development Kit (JDK) and Java Runtime Environment (JRE) under Ubuntu Linux? It appears that there are multiple JRE installed by default under Ubuntu. How do I select and use Sun JRE only? Can you explain steps required to set the environment to run java programs or apps?

A. Ubuntu Linux 7.10 has following packages from Sun:
=> sun-java6-bin : Sun Java Runtime Environment (JRE) 6

=> sun-java6-demo : Sun Java Development Kit (JDK) 6 demos

=> sun-java6-jdk : Sun Java Development Kit (JDK) 6

=> sun-java6-jre : Sun Java Runtime Environment (JRE) 6

Install Sun Java 6

To install proprietary Java, you must have the Multiverse repository enabled. Click on System > Administration > Software Source > Select Multisource > Close

Open a shell prompt (terminal) and type the following to install JDK and JRE:

$ sudo apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk

Setup the default Java version

Ubuntu Linux comes with update-java-alternatives utility to updates all alternatives belonging to one runtime or development kit for the Java language. To select, Sun's JVM as provided in Ubuntu 7.10, enter:

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

You also need to edit a file called /etc/jvm. This file defines the default system JVM search order. Each JVM should list their JAVA_HOME compatible directory in this file. The default system JVM is the first one available from top to bottom. Open /etc/jvm

$ sudo vi /etc/jvm

Make sure /usr/lib/jvm/java-6-sun is added to the top of JVM list

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

At the end your file should read as follows:
/usr/lib/jvm/java-6-sun
/usr/lib/jvm/java-gcj
/usr/lib/jvm/ia32-java-1.5.0-sun
/usr/lib/jvm/java-1.5.0-sun
/usr

Save and close the file.

Setup the environment variable

You also need to setup JAVA_HOME and PATH variable. Open your $HOME/.bash_profile or /etc/profile (system wide) configuration. Open your .bash_profile file:

$ vi $HOME/.bash_profile

Append following line:

export JAVA_HOME=/usr/lib/jvm/java-6-sun
export PATH=$PATH:$JAVA_HOME/bin

Save and close the file.

Test your new JDK

Type the following command to display version:

$ java -version

Output:

java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Server VM (build 1.6.0_03-b05, mixed mode)

Try HelloWorld.java - first java program

$ vi HelloWorld.java

Append code:

public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World!"); } }

Save and close the file. Compile HelloWorld.java and execute program by typing following two instructions:
$ javac HelloWorld.java
$ java HelloWorld

Output:

Hello, World!