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19 January 2021

How to View or List Cron Jobs in Linux

Written by Rahul
Cron name originates from a Greek word Chronos, which is used for time. It is a daemon for the Linux systems to automate the execution of commands or scripts at a specified time intervals. This tutorial will show you the several options to list all scheduled cron jobs for users on Linux systems. How...
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08 January 2021

Sendmail User Unknown Error (Resolved)

Written by Rahul
Recently, I have faced below issue with the fresh sendmail installation on an Linux system. While sending email to an specific domain like [email protected] are showing error “stat=User unknown“. The issue was happening for specific domain only. Sending emails to other domain were working properly. The log file entries are looks like below: Jan...
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28 December 2020

How to Install and Configure GitLab in Debian 10

Written by Rahul
Gitlab is a web-based DevOps lifecycle management tool developed by GitLab Inc. Similar to the Github, Gitlab is also another popular Git version control system used by large number of users. Gitlab also provides great features like issue tracking, To-Do list, continuous integration and deployment (CI/CD) pipelines for the applications. Gitlab also supports integration...
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26 December 2020

How to Secure GitLab Server with Let’s Encrypt SSL

Written by Rahul
We always say, Security first. It should be the first priority to keep your hard work safe from the hackers. This tutorial will take few minutes to secure Gitlab server using Let’s Encrypt SSL certificates. Let’s Encrypt provides free SSL certificates to secure your domains and an easy way to auto updates. This tutorial...
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25 December 2020

How To Install and Configure GitLab on Ubuntu 20.04

Written by Rahul
Gitlab is a web-based DevOps lifecycle management tool developed by GitLab Inc. It provides git version control repository management, issue tracking, To-Do list, continuous integration and deployment (CI/CD) pipelines for the applications. Gitlab also supports integration with various services. The Community edition of Gitlab is available free for use on development and production environment....
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25 December 2020

How to Install Netdata Monitoring Tool on Ubuntu 20.04

Written by Rahul
Netdata is an open source tool designed for the real-time system performance monitoring solution. It collects real-time metrics for system activities like CPU uses, memory uses, bandwidth uses and disk activities etc. And displays the information on web interface with graphical charts. Netdata official team recommend to install netdata monitoring tool using the kickstart...
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24 December 2020

dig Command in Linux with Useful Examples

Written by Rahul
dig stands for Domain Information Groper, is a command line network tool for gathering domain name server information. The dig command is another powerful tool similar to nslookup for diagnosing dns related problems. We can use dig command to query various dns servers to fetch records like address record, CNAME, TXT, Mail exchange records...
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23 December 2020

How to Install Opera Browser on Ubuntu 20.04

Written by Rahul
Opera is a Chromium-based multi-platform web browser developed by Opera Software. It have multiple features similar to the Google chrome as both are developed on Chromium. You will get a new looks and multiple different features that other browsers, which makes it more powerful. The Opera browser is available under the Snapcraft packages. Also...
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22 December 2020

How To Install and Configure VNC on Ubuntu 18.04

Written by Rahul
VNC stands for “Virtual Network Computing” is the set of protocols for sharing desktop systems remotely. There are many software available to access Linux based desktop remotely including, TigerVNC, TightVNC, Vino, vnc4server and many more. TigerVNC is a free, open-source and high-performance VNC server used to control or access Linux based desktop systems remotely....
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21 December 2020

su Command in Linux with Useful Examples

Written by Rahul
The su command is also known as switch user. This command is used to become another user during a login session. When invoked without a username, su defaults switch to the super user. Basically, the su command is used to change current logged in user to another user without logged out from system. It...
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