Enforce password for Ubuntu user on EC2 instances

Using linux (Ubuntu) instances on Amazon EC2 is a quite safe thing to do, at least measured by the security provided by the platform (security groups, ACL, physical security,..). I recommend reading their security site here. At the end of the day the server is only as secure as you configure it, if you choose to open all ports running services with their default configurations and password settings, Amazon can’t help you.

When connecting to a Ubuntu server with ssh you need to provide the keyfile (somekeyfile.pem) that you can download when creating the key pair.

Key file

Key file

This 2048 bit key is required to login as regular ubuntu user. What I dislike is the fact that this user can sudo all, so once someone manage to get into you user account, he has root access too. I recommend to set a password for the ubuntu user and change the sudoers configuration.

Change the password for user ubuntu

Open the sudoers include file

sudo vi /etc/suderos.d/90-cloudimg-ubuntu or sudo vi /etc/sudoers

change last line from



ubuntu ALL=(ALL) ALL

Android Samsung Galaxy Tab Alternative

I believe it makes no sense to buy a ~ 900.- SGD (3g, GPS), respectively a 500.- SGD (wifi only) device running Android 2.2 without any chance even to update to 2.3, such as the Galaxy Tab, the same time Galaxy is releasing already the new 3.0 based models. So how to find a cheap device that can compete with the Galaxy Tab ?
After buying one Android 10″ Tablet from DHGate.com without problems I decided to look for a second one, a 7″ device. Certainly not easy to find a good device among the many offers on the trading platform, but I was lucky enough to choose this PC-7006 1Ghz device for 223.- U$ (incl. shipping) from the dealer avatar2012:

Android MID 7"

Continue reading

Palroid – Root it or Brick it ?

My 3 year old daughter makes the device unusable in less than 5min after switching it on, simply by poking around the screen and opening a couple of apps.

There is very little (or better no) detail info about the specs of the Palroid that would help to find out if it is root-able.

One thing for sure, it has root access by default. Just simply do adb shell and go do the data folder, creating a file there is only possible for root user.

Now lets try to find out whats ticking inside the device

adb -d shell getprop | grep build

Inside Palroid

Its a TCC 8900 ! See specs here: http://csselectronic.com/telechips/tcc8900

No clue if it the ROM can be changed. I am looking for devices based on the same hardware. (so far Apad 7800, Haipad m1001)

Further digging only reveals this links:

to be continued..