How to check and troubleshoot SELinux logs?
The key to SELinux log troubleshooting is to find the correct log and interpret the rejection information. 1. The log is usually located in /var/log/audit/audit.log (If auditd is not enabled, it will be in /var/log/messages or /var/log/syslog); 2. Use ausearch-mavc-tsrecent or grep "avc:denied" to find the rejection event, and pay attention to fields such as scontext, tcontext, tclass, etc.; 3. Judging the reason for access failure based on the log, if the process does not match the target resource context, the solution includes modifying the file context and creating a policy.
Jun 27, 2025 am 12:13 AM
How to Check Linux OS Name, Kernel Version, and Information
There are several methods to determine the version of Linux running on your machine, along with details such as your distribution name, kernel version, and other useful information you may want to know or keep handy.In this straightforward yet essent
Jun 26, 2025 am 11:02 AM
How to Use fgrep Command to Find Text Strings in Files
Brief: In this beginner-friendly guide, we will discuss some practical examples of the fgrep command. By the end of this guide, users will be able to perform text search operations efficiently using the command line interface. Text searching is one o
Jun 26, 2025 am 10:56 AM
Shell In A Box - Access Linux SSH Terminal via Web Browser
Shell In A Box (pronounced as shellinabox) is a web-based terminal emulator developed by Markus Gutschke. It features an integrated web server that operates as a web-based SSH client on a designated port, prompting users to a web-based terminal emula
Jun 26, 2025 am 10:10 AM
How to Install PostgreSQL and pgAdmin4 on Linux Mint 22/21
pgAdmin is an open-source feature-rich, frontend management tool that allows you to easily administer and manage your PostgreSQL relational database from a web browser. It provides an easy-to-use user interface that simplifies the creation and monito
Jun 26, 2025 am 10:07 AM
How to Install Chrony NTP to Synchronize Time in Linux
The Network Time Protocol (NTP) is a protocol used to synchronize computer system clocks automatically over a network. The machine can have the system clock use Coordinated Universal Time (UTC) rather than local time. Maintaining accurate time on Lin
Jun 26, 2025 am 10:06 AM
Install Viber - A Free Calling and Messaging App on Linux
Brief: This article explains various methods to install and use Viber, a free voice and video calling and messaging app, on Linux.Viber is a widely used, secure, and free application for making voice and video calls and sending messages across deskto
Jun 26, 2025 am 09:37 AM
A Career in Linux is What You Should Be Pursuing In 2024
Brief: In this guide, we explore reasons why you should consider a career in Linux in 2024 and beyond.Linux turned 31 last year, as you can imagine it’s been an eventful journey. It grew from a pet project under the stewardship of Linus Torvalds, who
Jun 26, 2025 am 09:31 AM
How to Save and Exit a File in Vi / Vim Editor in Linux
It is true that learning Vi/Vim editor – a well-known text editor in the Linux ecosystem, is not as easy as learning Nano or Emacs, as it requires a little effort which is worthwhile.[ You might also like: My Favorite Command Line Editors for Linux –
Jun 26, 2025 am 09:18 AM
How To Remove Passphrase from SSL Certificate and SSH Key
Brief: Have you generated a certificate key or private key with a passphrase and want to remove it? In this guide, we will show how to remove a passphrase using the openssl command line tool and from an ssh private key.A passphrase is a sequence of w
Jun 26, 2025 am 09:14 AM
How to Hide Files and Directories in Linux
Do you sometimes share your Linux desktop with family, friends, or coworkers? If so, you may want to hide some personal files and folders. The challenge is figuring out how to conceal these files on a Linux system.In this guide, we will walk through
Jun 26, 2025 am 09:13 AM
How to see which files are opened by a process using lsof?
Toseewhichfilesareopenedbyaprocessusinglsof,firstobtainthePIDviapsorpgrep,thenuselsof-pPIDtolistopenfiles.1.Usepsaux|grepprocess_nameorpgrepprocess_nametofindthePID.2.Runlsof-pPIDtodisplayallopenfiles,includingcolumnslikeCOMMAND,PID,USER,FD,TYPE,andN
Jun 26, 2025 am 12:33 AM
What is Terraform and how does it differ from Ansible?
Terraform is an infrastructure-as-code tool for declaratively creating and managing infrastructure across cloud platforms; Ansible is a configuration management tool for automated configuration after the server runs. 1.Terraform defines the expected infrastructure state in a declarative manner, which is suitable for building an environment from scratch or large-scale changes; 2.Ansible performs tasks through YAML scripts, which is suitable for deploying applications, installing software and maintaining system state; 3.Terraform maintains state file tracking resources, while Ansible checks and implements configurations every time it runs; 4. The two are often used in combination: Terraform builds the infrastructure first, and Ansible then configures it.
Jun 26, 2025 am 12:32 AM
How to debug a shell script?
The key methods for debugging shell scripts include: 1. Use set-x or bash-x to view execution details. You can add set-x or runtime parameters at the beginning of the script to display each execution command and its parameters to help locate problems; 2. Check whether the variable is empty or assigned errors, print the variables through echo, use ${VAR_NAME:?} to force check whether the variable exists, and pay attention to the correct use of quotes to avoid parsing errors; 3. Add error handling logic to improve robustness, if you encounter errors with set-e, exit immediately, combine the trap command to clean or record, and add judgments to handle exceptions on important commands; 4. Use the shellcheck tool to discover potential problems in advance, and run shellch after installation.
Jun 26, 2025 am 12:30 AM
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