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...
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...
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...
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....
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...
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...
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...
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....
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...
Linux is the best and most-used open source operating system. The Linux users have a large number of options to choose operating system. You have options to choose desktop for your Linux systems. But still Linux professionals love the command line to work. Mainly the Linux server editions comes with command line option only,...