| 20 Aug 2025 |
 Arian | Have you looked at the repart appliance image tests? | 11:31:36 |
| Arian | What I'd do is make the AMI EBS Volume an EROFS volume. Then overlay mount the rootfs over it | 11:33:05 |
| Arian | and that can be on the instance store or whatever | 11:33:30 |
| Arian | or just... only mount /var to the instance store | 11:33:37 |
| Arian | Do you want to be able to have interactive nix usage afterwards? | 11:33:44 |
| 21 Aug 2025 |
 commiterate | These tests?
https://github.com/NixOS/nixpkgs/blob/02489e616d84df58c35f0bef559377f454abf410/nixos/tests/appliance-repart-image.nix#L28 | 02:43:36 |
| commiterate | I considered overlayfs but it doesn't seem to cache reads from the lower filesystem (whatever's on the EBS volume) to the upper filesystem (whatever's on the instance store). | 02:45:40 |
| commiterate | I'm not too sure what counts as interactive Nix usage, but these will be CI/CD runners so users should be able to do a nixos-rebuild switch afterwards to modify the environment (e.g. set up Docker Engine). | 02:47:12 |
| commiterate | That makes mounting something at / attractive since users don't need to remember to write under a special directory to hit the instance store instead of the root EBS volume. | 02:58:36 |
| commiterate | * That makes mounting something transparent at / attractive since users don't need to remember to write under a special directory to hit the instance store instead of the root EBS volume. | 03:02:34 |
| Arian | Ah so you're worried that all the nix store paths in the lower store will have slow access? | 12:26:42 |
| commiterate | Yup. | 16:25:30 |
| 28 Aug 2025 |
| Arian | @commiterate:matrix.org: we're getting to something very similar to what you want internally at Mercury for our runner fleet | 11:50:52 |
| Arian | Ill share when I'm at the office | 11:50:57 |
| Arian | Redacted or Malformed Event | 11:51:40 |
| Arian | Redacted or Malformed Event | 11:52:02 |
| Arian | Redacted or Malformed Event | 11:52:29 |
| Arian | Redacted or Malformed Event | 11:52:41 |
