Error – mount unknown filesystem type ‘lvm2_member’ [Fix]

David Peter — Wed, 15 May 2024 06:22:06 +0000

“Sometimes all bad things will happen at the same time” – I remembered this quote on a night when my client identified a bug on her e-commerce website and wanted me to fix it immediately. It was only at that moment, I realized that I had been locked out of...

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Change PDF Metadata from Linux Command Line

David Peter — Fri, 29 Sep 2023 09:28:59 +0000

PDF Metadata generally contains information about the PDF document – such as Title, Author, MIME type, creator, keyword, pdf version, etc. This information is embedded into the PDF document itself and read by the applications including WordPress and search engines. For instance, I uploaded a PDF document to WordPress media...

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Find which package the command belongs to in CentOS

David Peter — Mon, 07 Mar 2022 08:43:51 +0000

Question: I generally use rpm -qa | grep command to find which package the command belongs to. However, the grepped out would list multiple package names and sometimes even the wrong package names matching the search pattern. I was thinking if there is a better way to do this in...

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How to fix Unable to find a match: policycoreutils-python on RHEL/CentOS 8

Ramya Santhosh — Mon, 07 Mar 2022 07:00:57 +0000

While I was trying to install GitLab on CentOS 8, encountered the below error: Unable to find a match: policycoreutils-python. Below is the snapshot of the error. This article will help you to fix the error: Unable to find a match: policycoreutils-python. [root@centos8 ~]# yum install -y curl policycoreutils-python openssh-server...

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System-wide Crypto Policies in CentOS 8 [Explained]

David Peter — Mon, 07 Mar 2022 06:14:24 +0000

Can we assume that people who set up systems or software are experts in their field and they do understand the details of the cryptographic algorithms and everything they set up is safe from attackers? Whether our assumption is right or wrong, it is important that the systems and software...

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Virtual Machines menu missing in Cockpit Interface? [Fix]

Ramya Santhosh — Fri, 04 Mar 2022 11:22:42 +0000

Virtual Machines menu missing in the Cockpit interface? This article will help you to fix the issue. Recently, I started to use Cockpit to manage CentOS servers as it provides a web-based graphical interface that is easy to use. It is intended for everyone, especially those who are new to...

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Find number of Lines of Code from GitHub Repository

David Peter — Tue, 04 Jan 2022 11:42:52 +0000

How many lines of code did you write? Well, that was the question asked by one of the interviewers in my interview. At that time, I didn’t really know what to answer and I just blindly said it would be around ‘2 Lac lines of code’. Since the question was...

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Using multiple patterns at once with Sed command

David Peter — Fri, 29 Oct 2021 12:25:34 +0000

Here’s a question from one of our regular readers Mr. Manish. His question is, how to use multiple patterns at once with the Sed command in Linux for delete or replace operations. Consider an example file containing the following text. (I’m using the same example the reader asked for). SLURM_CLUSTER_NAME...

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Mistyped ‘ls’ command as ‘sl’ – Cure your bad habit of mistyping!

David Peter — Wed, 06 Oct 2021 13:57:58 +0000

Mistyping a command is common; for example, typing ‘sl‘ instead of ‘ls‘ is very common. But this mistyping resulted in a funny output on my colleague’s terminal and what I heard from him was a train running on the terminal. Seriously, he asked me to try out the command on...

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No module named Cython and Running cythonize failed [Fix]

Ramya Santhosh — Thu, 14 May 2020 12:10:29 +0000

I have been using Websockify to allow the browser to connect to any application or service on a Linux machine. This involves setting up Websockify server that translates the WebSockets to the normal socket and enables the traffic to follow between the client and the server. Installation of Websockify is...

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