Sunday, April 23, 2017

[SOLVED] - Connecting to Amazon EC2 Instance from Terminal in Ubuntu using SSH

This tutorial shows you how to connect to your Amazon EC2 Instance from your Ubunut's terminal/CLI by making use of SSH.

NOTE: if you have not installed a tool like OpenSSH in your Ubuntu system you may do so by checking out the following tutorial: http://linux-sys-adm.com/how-to-install-and-configure-ssh-on-ubuntu-server-14.04-lts-step-by-step/ or use a tool like PuTTY.

1. First down the EC2 Key Pair Private Key for your EC2 instance. To generate Key Pair, you may check the following tutorial: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html

2. Copy the Key pair (.pem) key to the location of your choice and make note of the location path. In my case, I created a folder called 'aws-keys' under my 'home' directory and placed the '.pem' file there.

3. Open your terminal & change the file/folder permission to 600 where you have stored your '.pem' key, else you will get an error as shown in the image below:

Click image to enlarge
NOTE: since you have changed 'file permission' to 600, you will have to use sudo.

 $ sudo chmod -R 600 aws-keys  

 4. Now enter the following commands to connect to your AWS EC2 Instance:

 sudo ssh -i file_name.pem ec2-user@<publicDNS>  

You can find your publicDNS in your EC2 Dashboard. Please refer image below:

Click image to enlarge
If login is successful you will see a message similar to the one show in the image below, depending upon your Amazon Machine Image (AMI).

Click image to enlarge

Uninstalling LibreOffice from Ubuntu using Terminal/Command Line

Please follow the instruction below to Uninstall LibreOffice from your Ubuntu system:

 sudo apt-get remove --purge libreoffice*  
 sudo apt-get clean  
 sudo apt-get autoremove  

Installing LibreOffice in Ubuntu from .deb Packages using Terminal

This tutorial will show you how to install the latest version of LibreOffice in your Ubuntu system. If you haven't downloaded the latest build for LibreOffice, go ahead do it at: https://www.libreoffice.org/download/download/.

1. When you unpack the downloaded archive, you will see that the contents have been decompressed into a sub-directory.

2. Now,change directory to the one starting with "LibreOffice_", followed by the version number and some platform information. Example:

 $ cd LibreOffice_5.3.2.2_Linux_x86-64_deb  

4. This directory contains a subdirectory called "DEBS". Change directory to the "DEBS" directory.

 $ cd DEBS  

5. Now open your terminal (CTRL+ALT+T) and enter as below.The following commands will install LibreOffice and the desktop integration packages (you may just copy and paste them into the terminal screen rather than trying to type them):

 $ sudo dpkg -i *.deb  

The installation process is now completed, and you should have icons for all the LibreOffice applications in your desktop's Applications/Office menu. You may also open your Unity Dash & start LibreOffice from there.

To uninstall LibreOffice,

Please check my other tutorial at: http://www.evagabond.me/2017/04/uninstalling-libreoffice-from-ubuntu.html

Friday, April 7, 2017

Lesson 1- Introduction to Amazon Elastic Compute Cloud (EC2)

This video gives you a clear understanding of the basics of Amazon EC2 web services.

Sunday, March 26, 2017

[SOLVED] - Add Currently Logged in User to Apache User & Group [www-data:www-data]

If you are experiencing permission issues with your web directories and files, use the following commands to resolve it, This solution is very helpful if you are trying to run Wordpress/Other CMS in localhost environment:

1. Adds the currently logged in user to the www-data group.

 sudo usermod -aG www-data $USER  

2. Changes the ownership of the /var/www directory to www-data group.
 sudo chown -R www-data:www-data /var/www directory_name

3. Sets the proper permissions so you can upload files via sftp, manage files via command-line, and upload plugins and media directly in WordPress.
 sudo chmod -R 774 /var/www directory_name

Saturday, March 11, 2017

How to Zip/Compress files using Terminal in Ubuntu/Linux

Use the following commands to compress your files using terminal. First, make sure you have Zip already installed in your system.

>> To install Zip: Open you terminal (CTRL+ALT+T) and enter the command below:
 sudo apt-get install zip gzip tar  

>> To Zip:
 zip -r compressed_filename.zip foldername  

where:
  • r: recursive
  • compressed_filename.zip: filename of the compressed-file that you are creating
  • folder_name: filename of folder that you want to compress
Seems to be much faster and consume almost 80%-90% less CPU processes than the one using GUI/Archive Manager.; but file size seems to be large by 10-20 MB than the one created using the menu option available in GUI/Archive Manager.

>> To Unzip:
 unzip my_arch.zip  

Zip stores relative path names by default. There are several parameter-options available for zip. For that read: the manual (man zip). For a starting this will do.

Most often you will see .tar.gz endings in linux-world. That's the product of two tools: TAR (the tape archiver) and GZIP (the GNU-Zip). Tar has got the call option to automatically gzip/gunzip files after "taring".
 tar -cvzf may_arch.tar.gz my_folder  

where:
  • -c means "create"
  • -v means "verbose" (sometimes bothersome and slowing down...)
  • -z means "use (GNU)zip"
  • -f XYZ declares the name of the output file. (You should chose a helping name like XYZ.tar.gz)
There may also be .tar.bz2 endings. This is the product of the -j parameter instead of the -z parameter: you will choose compression with BZIP2 (-> man bzip2).

To extract you simply use -x (eXtract) instead of -c (Create):
 tar -xvzf may_arch.tar.gz  

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