Configuration Files

Cybersecurity Linux Lesson 1.7.1

Updating Configuration Files

Updating configuration files involves making changes to the settings and parameters that define how a particular software or system operates

  • Configuration files are typically in plain text and contain instructions or configurations for different aspects of the software

Procedures

  • Before changes are made, create a backup of the current configuration file
  • Use a text editor, like nano, to review the current settings
  • Make the requested modifications
  • The corresponding service may need to be restarted for changes to text effect
  • Test the new configurations, monitor for issues, and document for future reference

RPM-based Systems

  • When updating packages in RPM-based systems, when a configuration file has been modified and includes an update, the new version may be saved with a .rpmnew extension to avoid overwriting user changes
  • The original file may be saved with a .rpmsave extension

Repository Configuration Files

  • Files that contain settings and configurations specific to a version control system repository
  • Configuration files include:
    • /etc/apt.conf in Debian-based systems
    • /etc/yum.conf in RPM-based systems
    • /etc/dnf/dnf.conf in Fedora and CentOS systems
  • The /etc/yum.repos.d directory contains individual repository configuration files with each file corresponding to a specific repository and including settings for package sources
  • The /etc/apt/sources.list.d directory contains additional configuration files for software repositories