26. Updating Linux

Updating Linux

Recap

• CentOS updates using Yum. Consider installing a single server as the central Yum repository and update locally.
• By verifying what updates are currently installed you can more effectively troubleshoot issues.
• Consider having a set of test machines that closely match production in configuration, apply updates there first.

Key Terms

• Yum: Yellowdog Updater, Modified is a free and open-source command-line package-management utility for Linux. It allows for automatic updates and package and dependency management.
• Repository: is a central location in which data is stored and managed.

Key Commands

• sudo yum list installed shows a list of installed packages and updates
• sudo yum list updates shows a list of available updates
• sudo yum update --securityruns security updates

Additional Resources

• Yum Cheatsheet
• Local Repository
• Updating CentOS