m/node: use pstore for panic storage

The old solution never worked as the ESP was not mounted at that stage.
In general storing crash data there is suboptimal as it makes lots of
assumptions about the system state.

For kernel crashes we already use pstore and there is an interface for
storing userspace messages in pstore as well. Set up the panic handler
to put its logs in there and extend the pstore cleanup runnable to also
dump that part of pstore into the logtree after reboot.

In most cases this also requires a kernel patch as most pstore backends
to not allow userspace messages, probably to preserve limited space.
Since we always clean pstore after reboot, this should be fine.

Change-Id: I011109112e7bfd24d1772d5853a1d491c0cfd026
Reviewed-on: https://review.monogon.dev/c/monogon/+/2753
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
6 files changed
tree: 5c5e47642c62a059307b7cb72f46edc302b86750
  1. .github/
  2. build/
  3. cloud/
  4. go/
  5. intellij/
  6. metropolis/
  7. net/
  8. third_party/
  9. tools/
  10. version/
  11. .bazelignore
  12. .bazelproject
  13. .bazelrc
  14. .bazelrc.sandboxroot
  15. .bazelversion
  16. .git-ignore-revs
  17. .gitignore
  18. BUILD.bazel
  19. CODING_STANDARDS.md
  20. go.mod
  21. go.sum
  22. LICENSE
  23. MODULE.bazel
  24. MODULE.bazel.lock
  25. README.md
  26. SETUP.md
  27. shell.nix
  28. WORKSPACE
README.md

Monogon Monorepo

This is the main repository containing the source code for the Monogon Platform.

This is pre-release software - take a look, and check back later!

Environment

Our build environment is self-contained and requires only minimal host dependencies:

  • A Linux machine or VM.
  • Bazelisk >= v1.15.0 (or a working Nix environment).
  • A reasonably recent kernel with user namespaces enabled.
  • Working KVM with access to /dev/kvm (if you want to run tests).

Our docs assume that Bazelisk is available as bazel on your PATH.

Refer to SETUP.md for detailed instructions.

Monogon OS

Run a single node demo cluster

Build CLI and node image:

bazel build //metropolis/cli/dbg //:launch --config dbg

Launch an ephemeral test node:

bazel test //:launch --config dbg --test_output=streamed

Run a kubectl command while the test is running:

bazel-bin/metropolis/cli/dbg/dbg_/dbg kubectl describe node

Test suite

Run full test suite:

bazel test --config dbg //...