TechnoLinuxx

 Patching a Linux system is a critical task to ensure that the system remains secure, stable, and up-to-date with the latest features and fixes. Here’s a comprehensive guide to the tasks involved in Linux patching: 1. Pre-Patching Preparation Backup System : Ensure you have a full system backup, including critical data, configuration files, and applications. Test the backup to verify its integrity. Check Disk Space : Verify that you have enough disk space, particularly on /var , /tmp , and /boot partitions. Review Current Patch Level : Determine the current patch level and installed packages using package management tools like yum , apt , dpkg , or rpm . Check System Logs : Review system logs to identify any issues that might affect the patching process. Test in a Staging Environment : If possible, apply patches in a staging environment that mirrors production to identify potential issues. Notify Stakeholders : Inform stakeholders about the scheduled maintenance window and expected do

 Pre-patching tasks in a Linux environment are critical to ensuring a smooth and successful patching process. These tasks help in minimizing downtime, preventing issues during the patching, and ensuring the system's stability. Here’s a checklist of common pre-patching tasks you should perform: 1. Backup Critical Data Full System Backup : Perform a full system backup, including configuration files, databases, and critical application data. Verify Backup Integrity : Ensure that the backup is complete and can be restored if necessary. 2. Review Patch Notes Understand the Patch : Review the release notes and documentation for the patches you plan to apply. Understand what is being updated and any potential impact on your system. Check Dependencies : Verify that all dependencies for the patches are met, including hardware, software, and configuration requirements. 3. Check System Health Disk Space : Ensure there is sufficient disk space available, especially on /var , /tmp , and /boot

  1. Backup Scripts Automated Backup : Backs up files or directories to a specified location (local or remote) and often runs on a schedule via cron . Database Backup : Dumps a database (e.g., MySQL, PostgreSQL) and stores the backup in a secure location. 2. System Monitoring Scripts Disk Usage Monitoring : Checks disk space usage and sends an alert if usage exceeds a threshold. Process Monitoring : Monitors the status of critical processes and restarts them if they are not running. Service Health Check : Regularly checks if services (e.g., web server, database) are running and restarts them if necessary. 3. System Update Scripts Automated Patching : Updates system packages and applies patches on a regular basis. Kernel Upgrade : Automates the process of upgrading the Linux kernel on a server. 4. User and Permission Management User Account Creation : Automates the creation of user accounts with predefined settings (e.g., home directory, shell). Permission Setup : Sets permissions and o

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 This is the pdf that you will ever need to master Linux.

This is the set of Linux questions asked in interviews for a 3 year old experienced candidate.