Packer

Hi Folks! Introduction: In this post, I will introduce you about packer. Packer is actually open source tool for creating machine and container images for multiple platforms from single source of configuration. As a configuration It uses a json syntax for creating machines for different platforms such as  Amazon EC2, Docker, VirtualBox, VMware etc. Actually […]

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SSH Two-Factor Authentication

Hi Folks! Proliferation of the Internet changes our life that almost anything demands for the Internet. Our personal information, bank accounts, Company’ secrets etc.. So, how we protect our computer systems from intruders ? As you know most common method is password authentication. But People are so inclined to use short passwords. Brute-Force methods prevails […]

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Kick Start Questions and Answers

Q1: I configured my kickstart(ks.cfg) network configuration as static IP. But  it reverts to dhcp after installiation. Why? network –bootproto static –device=eth0 –gateway 192.168.17.2 –ip 192.168.17.38 –nameserver 192.168.17.2,8.8.8.8 –netmask=255.255.255.0 –activate network –hostname vagrant.tbag.local And I said : do not forget to add device parameter in your kick start file and it has to be proper […]

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Java Time Zone Update

Hi Folks! We may face consequences that we need to change time zone due to government regulations such as daylight saving time and other purposes. And it is inevitable. For OS side it is very easy to update system time zone. For Linux tzdata package comes for this purpose. But If we have Java applications, […]

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Sending an Email Using Shell

In this post I will introduce you about sending an email by using terminal, as sending an email via graphical MTA can be cumbersome.:) To  send an email on shell terminal, I will use ssmtp which sends mails local computer to configured mail hub. It is not  mail server such as postfix. Ssmtp package exists […]

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Dynamic DNS

Hi Folks! It has been long time, I have not posted anything since December.  Actually I had to do many things. I was battling upkeep of Company Servers and upgrading them. But during that time  I learned many things and I would like to share  with you all. In this post I will introduce you […]

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