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Ubuntu One Files client for Android phones

Ubuntu One Files for Android is an application written by Micha? Karnicki as part of Google Summer of Code Project (GSoC) 2010. The client is licensed under the GNU Affero GPL v3 and its source code is available from Launchpad.

Google Android Ubuntu One files

The application lets you synchronize your phone contacts, files and photo gallery on the cloud automatically. Ubuntu One files also offers convenient feature to change the visibility of your files, making it easier for you to share files with the rest of the world.

Ubuntu One Files is also available on the Android Market, free of charge.

Note: Ubuntu One is a service similar to Box.net that enables you to store your files on the cloud. You do not need to be an Ubuntu user to use Ubuntu One. Each registered user are given 2GB space for free.

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Debian Squeeze 6.0.2 update (Security – important)

Debian project has released update on Debian 6.0 (Squeeze) which addressed several security issues and bugfix. Debian Squeeze users are advised to update their installation using “apt-get update” and “apt-get upgrade” command to ensure all of the updates are installed properly.

p/s: Although I currently use Ubuntu, I was actually a Debian user and I continue to use Debian on my VPS to host this website till this very day. Without Debian, I would never has discovered thousands of wonderful open source software in it vast software repositories :)

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How to limit MySQL port access to specific network

MySQL service port are not meant to be accessible to the outside world as it would become a security concern to the administrator.

Although MySQL server (mysqld) by itself has a built-in mechanism to deny access from unauthorized ip-address, it still does not protect it from being overwhelmed by multiple malicious requests or buffer overflow attack directed to the server.

One of the solution is to limit the MySQL port access to trusted network using iptables

This assume your trusted network has the address within the range of 192.168.1.1-192.168.1.254


iptables -A INPUT -i eth0 -p tcp -s 192.168.1.0/24 --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp --sport 3306 -m state --state ESTABLISHED -j ACCEPT

MySQL server (mysqld) uses port 3306.

Note: Always assume the internet as the untrusted network!

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Ubuntu 11.10 drops Synaptic package manager

The upcoming Ubuntu 11.10 release (Oneiric Ocelot) will drop Synaptic Package Manager from default installation in favor of Ubuntu Software Center.

This has been foreseen since Canonical has spend their effort in developing and improving Ubuntu Software Center as a convenience one-stop center to install free and paid software alike.

Personal Thoughts
Personally, I still prefer to use Synaptic Package Manager over Ubuntu Software Center as it is still doesn’t offer the same number of options that I used to get from Synaptic (ability to search by name, description, ability to test the fastest mirror).

But I believe the changes that Canonical and Ubuntu community made might make it easier to streamline the looks and functionality of package manager into desktop environment (Unity) regardless of the computing platform.

Synaptic

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How to make sudo display funny error messages in Ubuntu Linux

sudo is probably the most used command in Ubuntu.

In this post, I will show you how to make ‘sudo’ display funny and humorous error messages in Ubuntu Linux.

To do that, you would only need to edit the /etc/sudoers :

sudo nano /etc/sudoers

Then find the line that starts with Defaults env_reset, add insults at the end of the line so it would look like this:

# See the man page for details on how to write a sudoers file
#
Defaults env_reset, insults

Save the file, and you are done! You can test the results by running the sudo command and entering the wrong password.

Screenshot Demo

sudo insults