Lesson 6: Package Management

What is Package Management?

Package management automates the installation, upgrading, configuration, and removal of software packages in Linux systems.

Popular Linux Package Managers

• APT – Debian, Ubuntu
• YUM – RHEL, CentOS (older)
• DNF – RHEL, Rocky, AlmaLinux

Basic Package Commands

• apt install package
• apt update && apt upgrade
• yum install package
• dnf install package

Repositories Explained

• Repositories store software packages
• Defined in /etc/apt/sources.list or /etc/yum.repos.d
• Custom repositories for enterprise software

Package Management in DevOps

• Automated server provisioning
• Consistent environments across stages
• Security patching
• CI/CD agent setup

Troubleshooting Package Issues

• Dependency conflicts
• Broken repositories
• Cache cleanup
• Version pinning