Linux

In the realm of Unix-like operating systems, where command-line prowess reigns supreme, sed stands tall as a versatile and indispensable tool.

Loops in Ansible allow you to repeat a task multiple times with different input values.

In Unix-like operating systems, file permissions play a critical role in ensuring system security and proper access control.

One of its Ansible’s features is the ability to execute tasks with elevated privileges, often necessary for managing system configurations. This process is known as privilege escalation.

Linux, as an open-source operating system, has undergone significant transformations over the years.

The /etc/profile.d directory, though seemingly simple, plays a vital role in the smooth operation of your Linux system.

Previously I gave a high level flow for how a process of simple file write looks like in a Linux environment here. In this blog, I will add more tech-details.

Writing to a file on a device in Linux involves a fascinating journey through different layers of the system.

SNMP (Simple Network Management Protocol) is a widely used protocol for managing and monitoring network devices, such as routers, switches, servers, and printers.

The Linux Kernel stands as the backbone of the Linux operating system, serving as a critical component that enables the system to interact with hardware and manage system resources efficiently.

SSH tunneling is a powerful technique that allows you to securely tunnel network traffic between two endpoints.

Ansible is a powerful automation tool that can be used to manage the configuration and deployment of a large number of systems. It has a rich library of modules that can be used to perform a variety of tasks, from managing files and packages to deploying applications and configuring network devices.

Recently during our discussion with a client a problem was raised how to show progress for a long running Ansible playbook task & this blog is just an outcome of the things I tried and delivered.

A scenario in Molecule is a configuration that defines how a role should be tested. It consists of a set of instructions and parameters that determine how a role is provisioned, converged, and verified. The purpose of scenarios is to allow for flexibility in testing a role by allowing multiple testing configurations to be defined and executed. You can have as many scenarios as you like and Molecule will run one after the other.

Variables are a crucial part of Ansible and are used to store values that can be used across playbooks, roles, and tasks.

Ansible’s lookup plugin allows you to access data from a variety of sources, including files, templates, and external programs.

The file can be placed in various locations, such as the current directory, user’s home directory, /etc/ansible/, and /etc/ansible/conf.d/.

Ansible Variables are used to store values that can be reused throughout an Ansible playbook.

Templates in Ansible are a type of file that contain configuration information or scripts written in a Jinja2 templating language.

To set up SSH access for inventory hosts in Ansible, follow these steps:

An Ansible inventory is a file that defines the hosts and groups of hosts that Ansible will manage. Inventory files are used to define the nodes (hosts) that will be managed by Ansible.

Ansible is an open-source software platform for automating and managing IT infrastructure.

The structure of an Ansible playbook includes the following elements:

Ansible is an open-source software platform for automating and configuring computer systems.

awk is an interpreted language. The basic function of awk is to search files for lines that contains certain patterns. When the input line matches the pattern(s), awk performs specified actions on that line.

Continuing from where I left in the blog before. If you are using looking to configure a static IP for your machines (may be your use case is similar to mine) this blog might be useful for you.

In this blog let’s try and look at some of the commands I used to build an RockyLinux machine on a MacPro M1.

Life is bringing it own challenges as I have moved to the United States of America. One of the immediate tech challenge has been using the loaner windows box and still be productive.

Control node Managed nodes Inventory Modules Tasks Playbooks

Bash is different world. Powerful, simple, elegant and complex all at the same time.

– The SSH protocol uses public key cryptography for authenticating hosts and users.

💬 What is SSH protocol? 💬 It is also referred to as Secure Shell, is a method for secure remote login from one computer to another. It is an alternative to telnet and rlogin

Personal notes on Bash: arithmetic, = versus ==, single versus double brackets, and the bc calculator.

In this blog I will walk you through basic steps needed to deploy a Zabbix 5 Agent on a Centos Machine. The Zabbix Release is available here. Machine # root@node4>cat /etc/redhat-release CentOS Linux release 7.9.2009 (Core) Download and install the RPM

I am using Virtual Box 6.1 and will use it to expand the disk space for one my VBox Ubuntu image which was almost full. Click on File > Virtual Media Manager

MAN Pages are one source of truth for all curious queries. man ps Name ps - report a snapshot of the current processes. It is used to display instant information about the active processes in the system.

The CPU operates in two modes in Linux User mode (non privileged mode) Kernel mode (System mode) When operating in Kernel mode it has un-restricted access to resources like memory and input output devices.

Ping # I have used ping often but never to an extend that I could understand the complete range of options and power available at hand.

systemd is the replacement system for System V and with the primary goal of starting services in parallel. Remember init levels? GRUB: Grand Unified Boot Loader — /boot/grub/grub.conf Some key points

Did you ever see a warning printed on your console the moment you log into your Linux machine and did that warning ever complaned to you about the benign locale?