Today, various services (native, LXC, Docker) are running on my server. I'm mostly happy with the setup, but I decided to revisit my server's defenses under the assumption that a remote attacker or malicious code could compromise my services. A service might break out of its container or even gain root privilege. VMs are a better security boundary than containers; they can limit the damage if an attacker gains root privilege. I cannot afford to run a dedicated VM for each service, so I will need to carefully group the services and run a dedicated VM for each group. Each group should be carefully designed based on the data accessed and the features/capabilities required. For example, some VMs may have access to my photos, while others may not have network access. The Goal There are two particular issues I want to address: First, I want VM images to be easily reproducible, which makes backup and restore trivial. NixOS and GNU Guix System are great examples, where you only need to...
久病成医 | Prolonged Illness Makes the Patient a Good Doctor