...
This page outlines the general practices for maintaining an up‑to‑date VM, regardless of the operating system or workload running on it.
Table of Contents
Why Updates Matter
Security: Patches fix vulnerabilities that could be exploited by attackers.
Stability: Updates improve system reliability and fix known bugs.
Performance: New kernels, drivers, and libraries often bring optimizations.
Supportability: Outdated systems may fall outside support.
General Good Practices
1. Apply OS Updates Regularly
Ensure your VM receives the latest security and maintenance updates from the operating system vendor.
...
Ubuntu: Use apt to install updates.
2. Enable Automatic Security Updates
Enable automatic installation of security patches to reduce exposure windows.
...
Ubuntu: Use unattended-upgrades.
3. Reboot When Required
Some updates (kernel, drivers, security patches) require a reboot to take effect. Plan maintenance windows to reboot safely without impacting workloads.
4. Keep System Packages and Libraries Updated
Applications depend on system libraries. Updating them ensures compatibility and reduces vulnerabilities.
5. Remove Unsupported or End‑of‑Life OS Versions
End‑of‑life operating systems no longer receive security updates. Plan migrations before the vendor support window ends.
6. Monitor Available Updates
Use built‑in tools or configuration management systems to track pending updates.
7. Snapshot Before Major Upgrades
Before kernel upgrades or distribution upgrades, take a VM snapshot to allow quick rollback if needed.
...