We are thrilled to announce that our VPN infrastructure is now completely diskless! In early 2022, we started the process of migrating to a diskless infrastructure using our unique bootloader called “stboot”. We have successfully completed this transition and have audited our VPN servers twice to ensure the integrity of our configuration. Moving forward, all audits will only focus on RAM-only deployments. Our VPN servers utilize a custom-built Linux kernel that is lightweight and up-to-date with the latest features and performance enhancements. This slimmed-down kernel allows us to eliminate unnecessary bloat, resulting in an operating system that weighs just over 200MB. With every reboot or provisioning, we can guarantee a freshly built kernel, no log files, and a fully patched OS. This groundbreaking achievement sets us apart from others in the industry.
https://mullvad.net/en/blog/2023/9/20/we-have-successfully-completed-our-migration-to-ram-only-vpn-infrastructure/