Linux, Ubuntu, Debian, Mint, CentOS Tutorials
The docker tag command is used to manage tags for the docker images. An image consists of multiple layers which can be derived by new other docker images. Tags are used to identify and track different images easily. Tags names should only use ASCII characters. The tags are registered the registry-1.docker.io in order to be … Read more
SELinux or Security Enhanced Linux provides extra security for Linux distributions. SELinux is generally installed on enterprise Linux distributions like Ubuntu Server, RHEL, CentOS, etc., and generally enabled by default. But this case may change according to different situations. SELinux provides 3 modes called Enforcing , Permissive and Disabled . In this tutorial, we explain … Read more
RHEL and CentOS operating systems provide the SELinux security feature by default. The SELinux is enabled by default but in some cases, we may need to disable SELinux. This tutorial explains how to disable CentOS7, CentOS8, and RHEL SELinux. SELinux Modes Before disabling SELinux for CentOS we should know the SELinux modes. SELinux provides the … Read more
SELinux or Security Enhanced Linux is a Linux security module provided via the Linux kernel. The SELinux can be used to deny, and restrict the different types of access to processes, ports, networks, etc. The SELinux provides mainly access controls. SELinux is generally installed by enterprise-level Linux distributions like Ubuntu, RedHat, and CentOS and is … Read more
Linux and Unix operating systems use plain text for configuration etc. The Unix and MS-DOS text file formatting may have some differences which may require converting files. The MS-DOS which is Windows format used carriage return (CR) followed by Line feed (LF) are interpreted as a newline. But Linux and Unix only Line Feed (LF) … Read more
Linux processes access the whole root directory by default. But in some cases, some processes may be required to restrict access to only specified directories or paths. The chroot command is used to change the specified process root directory into a different and fake one. For example, if we want to restrict the bash the … Read more
The grep command is used to filter or search or match some text or regex in a text file. The grep command provides a lot of different options and features that can be used for different cases. The grep command can be used to match one of the multiple search terms which can be accomplished … Read more
Linux provides the fdisk command in order to manage disks, partitions, and file systems. The fdisk command is created for Unix and Linux systems but also ported into different operating systems like DOS, IBM OS/2, Windows *BSD, etc. In this tutorial, we examine the fdisk usage in Linux distribution to create partitions, set sector sizes, … Read more
The sed command is a stream editor used in Linux and Unix operating systems popularly. The sed command is used to search, replace, edit, insert, delete, and similar text operations for single or multiple files via command-line interface in a programmatic way. sed Command Syntax The sed command syntax is like below where OPTIONS, SCRIPT, … Read more
Linux is a process bound operating system where every taks and action is taken via processes. There are a lot of process for system and user related tasks. Daemons or service processes expected to be run in background continuously and user processes generally started and completed after complating tasks. But in some cases we may … Read more