When a Docker node is created on a remote compute whose Docker daemon
does not have the image, the compute now raises ImageMissingError
instead of blindly pulling from the Docker repository. The controller
exports the image from the Docker daemon on its host (docker save
stream) and streams it to the compute which loads it, so locally built
or docker-loaded images work across computes. When the image is not
available on the controller host either, the compute is asked to pull
it from the Docker repository as a fallback.
- add a POST /docker/images/load compute endpoint that streams a
docker save tar into the Docker daemon
- let Docker.http_query pass raw (non-dict) request bodies through so
the tar can be streamed to the daemon
- drop the inline pull from DockerVM.create() and the now unused
DockerVM.pull_image wrapper
Nine fixes from a review of the docker-shm-devices diff:
* GNS3_STOP_TIMEOUT >300 s aborted at the manager's default HTTP timeout
before Docker finished the stop — the stop query now gets a timeout
with a margin over the grace period.
* Overlapping bind targets (GNS3_MASK_UDEV + GNS3_MASK_SYSTEMD on the
same unit, a unit named twice, an extra_configs target equal to a
masked unit) made Docker reject the create with 'Duplicate mount
point' — Mounts are deduplicated by target.
* ExtraConfig.target now carries a pydantic validator (absolute file
path, no '..'), so bad targets 422 at template-save time instead of
failing at node-create time after a multi-GB image pull; directory
forms ('/', '/etc/') are also rejected by the runtime guard instead
of raising IsADirectoryError (raw 500).
* _check_host_readiness skipped every remaining check when one
/proc/sys key was unreadable (mid-loop return) — now continues.
* The base-class GNS3_* env parser strips trailing commas like the
vendor parser, so 'GNS3_MASK_UDEV=1,' composed from a list still
activates.
* Vendor env knobs are re-parsed on every create(), so a PUT to the
node's environment takes effect on the next (re)create.
* The graceful SIGTERM stop is now limited to the explicit user stop
route; delete/update/close/crash-cleanup keep the immediate kill
(those paths force-delete or recreate the container right after).
* An extra_configs target beneath a persisted volume is shadowed by the
volume bind — warn at create time.
Add a read-only _check_host_readiness() that runs once after the Docker
daemon connection is established. It reads /proc/sys inotify/file-max
limits and /proc/filesystems (for FUSE), and logs a warning with the exact
commands to fix when they are too low for heavy containers -- XRd wants
~4000 inotify instances per node against a stock default of 128.
The server runs unprivileged (only the setuid ubridge helper has root), so
it can only check, not set; the warning tells the admin exactly what to
raise once. Stays silent when the limits are already sufficient.
