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Adding storage to root volume of Ubuntu Amazon EBS Instance

Recently I had to increase the size of root volume of my EBS based Amazon instance. After performing search on Google I got the reply from a Amazon executive.

You can expand the existing root EBS volume for an EBS-backed Ubuntu instance.
Here are the following steps you need to perform.

• Stop the instance.
• Create a snapshot of the root EBS volume.
• Create an EBS volume from that snapshot with the new desired size. (Please ensure it is in the same Availability Zone as the instance)
• Detach the root EBS volume of the instance.
• Now attach the newly created EBS volume to /dev/sda1 on the instance.
• Now start the instance and then login again.
• Enter 'df -h' to see the current size of the root volume. You should see the new size coming into picture for the /dev/sda1 or /dev/xdva1. If you are still not getting the new size then execute the following command. 
• Enter 'sudo resize2fs /dev/sda1' or 'sudo resize2fs /dev/xvda1' to get the rest of the expanded disk depending on your instance.
• Enter 'df -h' again to see the new size of the root volume. Now you should see the new size coming into picture for the /dev/sda1 or /dev/xdva1 as per your instance configuration.

Please note that some of the recent ubuntu instances don't need to execute the resize2fs command. 

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DND Manager blocks spam calls/sms permanently

About

DND Manager is an app to block unwanted Calls/SMS. It sends an SMS to 1909 in TRAI specified format to block these numbers. Download it from herehttps://play.google.com/store/apps/details?id=com.webshrub.moonwalker.androidapp

Description

DND Manager is an app to block unwanted Calls/SMS. It sends an SMS to 1909 in TRAI specified format to block these numbers.

User can initially block/unblock the categories as well. This app marks the pesky number as a spam in NCPR database which is maintained by TRAI.

After reporting the number to TRAI user gets a confirmation SMS which can be used to track the status of his complain from TRAI. Sending the SMS to 1909 is toll free.

General Information

1. What is this app for?

This app reports a spam call/SMS to the concerned authority TRAI in a specified format. These spam calls/SMS are also known as Unsolicited Commercial Communication(UCC)

2. How does this app do that?

It extracts time, date and number from your call log or SMS log. It then formats them into a SMS and sends it to 1909 using TRAI specified format.

3. Can i send this message without this app?

Yes of course, you can. However you need to send the SMS in a very specific format which is hard to be generated by users. If sent in a wrong format, you will receive an error from your operator.

4. There are other spam blocker apps as well, how this is different from other apps?

Numbers reported using this app will never be able to send a UCC again because other apps hide such spams from your phone. This app, however, offers something more permanent by sending a SMS to TRAI to block such numbers

5. I don't see all my calls and SMS. Why?

As per TRAI regulations any UCC should be reported within 3 days of receiving. That's why this app hides SMS/calls older than three days.

6. Are calls and SMS from my contacts filtered?

Yes. This app only shows calls and SMS from numbers those are not in your contact list.

7. What happens when I report a UCC to TRAI?

You get a confirmation from your operator about your report. You also get a complaint number. Your operator issues a warning to the sender to never send a UCC to your number. If they send you UCC again there are fines for a second incidence.

8. Is sending SMS to TRAI free?

Yes. Sending SMS to 1909 is toll-free.

9. I sent a message, Now I am getting errors about wrong format?

Even though TRAI has specified one universal format, different operators have implemented their own format for reporting UCC. You let us know the operator name and we will incorporate changes in app to support those operators. However, you might also get "Default not configured", "Generic failure error" or "Service not available" errors. These are errors on operator's side. Please contact your customer care.

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Creating a custom AMI on Amazon EC2

http://ttlnews.blogspot.in/2009/01/setting-up-amazon-ami-with-java-and.html

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Setting up FTP server on Ubuntu

https://help.ubuntu.com/10.04/serverguide/C/ftp-server.html

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How to install OpenVPN on Ubuntu Linux

Make sure you run all mentioned command as root not sudo
$sudo su

http://www.howtoforge.com/internet-and-lan-over-vpn-using-openvpn-linux-server-windows-linux-clients-works-for-gaming-and-through-firewalls

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How to scan a port using nmap

nmap -PN ec2-75-101-194-164.compute-1.amazonaws.com -p 80

Starting Nmap 5.21 ( http://nmap.org ) at 2012-02-17 14:56 IST
Nmap scan report for ec2-75-101-194-164.compute-1.amazonaws.com (75.101.194.164)
Host is up.
PORT   STATE    SERVICE
80/tcp filtered http

Nmap done: 1 IP address (1 host up) scanned in 2.43 seconds

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How to setup Amazon EC2 on ubuntu

https://help.ubuntu.com/community/EC2StartersGuide

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How to know the character set and collation of mysql database, table and column

Here are the SQL commands to know the character set and collation of mysql database and tables/columns

mysql> use database_name;
mysql> show variables like "character_set_database";
mysql> select data_type,collation_name from information_schema.columns where table_schema='database_name' and table_name='table_name' and column_name='column_name';

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