DISCLAIMER : Please note that blog owner takes no responsibility of any kind for any type of data loss or damage by trying any of the command/method mentioned in this blog. You may use the commands/method/scripts on your own responsibility.If you find something useful, a comment would be appreciated to let other viewers also know that the solution/method work(ed) for you.

Install AzCopy on Linux - Fastest way to copy in Azure

AzCopy is a command-line utility designed for copying data to/from Microsoft Azure Blob, File, and Table storage, using simple commands designed for optimal performance. You can copy data between a file system and a storage account, or between storage accounts.

There are two versions of AzCopy that you can download. AzCopy on Linux is built with .NET Core Framework, which targets Linux platforms offering POSIX style command-line options. AzCopy on Windows is built with .NET Framework, and offers Windows style command-line options.

This article covers AzCopy on Linux.

Installation on Linux


AzCopy on Linux requires .NET Core framework (version 2.0) on the platform. See the installation instructions below 

Install and enable the .NET SDK


After registering with the Subscription Manager and enabling the .NET Core channel, you are ready to install and enable the .NET SDK.

In your command prompt, run the following commands: 

yum install rh-dotnet20 -y scl enable rh-dotnet20 bash

Once you have installed .NET Core, download and install AzCopy.

wget -O azcopy.tar.gz https://aka.ms/downloadazcopyprlinux tar -xf azcopy.tar.gz sudo ./install.sh

You can remove the extracted files once AzCopy on Linux is installed. Alternatively if you do not have superuser privileges, you can also run AzCopy using the shell script 'azcopy' in the extracted folder.

The basic syntax for AzCopy commands is: 

azcopy --source <source> --destination <destination> [Options]

The following examples demonstrate various scenarios for copying data to and from Microsoft Azure Blobs and Files. Refer to the azcopy --help menu for a detailed explanation of the parameters used in each sample.

If any user face issue while running azcopy command which asks for dotnet files, enter the below line in the users .bashrc file.

source scl_source enable rh-dotnet20

If  a user oracle needs to run this command, then add the below line to the oracle .bash_profile under PATH section

/opt/rh/rh-dotnet20/root/usr/bin/

Add the below line in the script if you would use azcopy in a shell script.

source scl_source enable rh-dotnet20

 Now type azcopy in the server and it shows the available options to use, you can explore the options and use this command as required.
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How to keep X11 display after su or sudo - MobaXterm

I have received a lot of emails asking how to keep X11-forwarding working after changing user to root inside a SSH session in MobaXterm. This is by default not allowed on Unix/Linux systems, because the X11 display connection belongs to the user you used to log with when connecting to your remote SSH server. X11-forwarding mechanism does not allow anyone to use the open display.



However, in some cases you may need to start a graphical application like nedit or firefox in a sudo or su context. In order to achieve this, you could manually retrieve X credentials in the su/sudo context by looking up the “xauth list” for the original username and then adding them using “xauth add” to the current context.

You can also use a single (magic) command in order to achieve this!

For instance, here is a simple scenario:
  1. I start a SSH session to remote server “Server1” with user “john”
  2. In this session, I perform a “su -” command in order to become “root”
  3. If I run “xclock”, the following error occurs:
MobaXterm X11 proxy: Authorisation not recognised
Error: Can’t open display: localhost:10.0
I just have to execute the following command in order to retrieve my display and make “xclock” work:
xauth add $(xauth -f ~john/.Xauthority list|tail -1)
We hope this will help you if you need to have a working X11 display through SSH after becoming root.


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Install and configure Squid proxy server on Linux

A proxy server is a computer that acts as an intermediary between a desktop computer and the internet and allows a client machine to make an indirect connection to network servers and services. There are many reasons why you might want to include a proxy server on your network:

  1. To share internet connection on a LAN
  2. To speed up internet surfing
  3. To hide the IP address of the client computer for anonymous surfing
  4. To implement internet access control
  5. To scan outbound content
  6. To circumvent regional restrictions
Clearly some of the above reasons are perfectly fitting for a business and some, well, may not fall in line with your best practices. Regardless, knowing how to install and configure a proxy server is a must-have skill for a network administrator. So, let's take care of that. 

1. Install Squid


Squid can be easily install using yum command line tool.
# yum install squid

2. Setup Port and Start Service


Squid by default run on port 3128. If you want to start squid on different port, Edit squid configuration file and change http_port value. For example we are changing squid to run on port 8080.
# vim /etc/squid/squid.conf

http_port 8080
Start/Restart Squid service.
# service squid restart

3. Configure SQUID to Block Specific Website


Add below rules to block specific website before any allow all rules. Below example will block yahoo.com and www.rediff.com.
acl blocksite1 dstdomain yahoo.com
acl blocksite2 dstdomain www.rediff.com
http_access deny blocksite1
http_access deny blocksite2
If you have a long list of domain names, Create a file /etc/squid/blockwebsites.lst and put domain names one per line and add below rule in squid configuration file.
acl blocksitelist dstdomain "/etc/squid/blockwebsites.lst"
http_access deny blocksitelist
blockwebsites.lst file content example:
# cat /etc/squid/blockwebsites.lst
yahoo.com
www.rediff.com

4. Configure Squid to Block Specific Keyword


Add below rules to block specific website before any allow all rules. Below example will block all pages having keyword yahoo or gmail.
acl blockkeyword1 url_regex yahoo
acl blockkeyword2 url_regex gmail
http_access deny blockkeyword1
http_access deny blockkeyword2
If you have a long list of keywords, Create a file /etc/squid/blockkeywords.lst and put keywords one per line and add below rule in squid configuration file.
acl blockkeywordlist url_regex "/etc/squid/blockkeywords.lst"
http_access deny blockkeywordlist
blockkeywords.lst file content example:
# cat /etc/squid/blockkeywords.lst
yahoo
gmail
facebook
Congratulation’s you have successfully installed and configured Squid proxy server

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