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node-registration-store: record each Kubernetes node's EC2 instance - #1676
Records the EC2 instance each Kubernetes node runs on, and the instances that one replaced, in the node_k8s.instance_id column and the node_k8s_superseded_instances table that #1686 adds. Nothing reads them yet.
The dead-node check finds a node's instance in EC2 by its private DNS name. EC2 forgets a terminated instance about an hour after it terminates, so an old dead node returns no match, as a wrong region, account or name does, and a same-IP replacement reuses the node id and answers for the new instance.
record_k8s_node_instance (private to pplx-space-node-registration-store) writes both in the caller's transaction: it locks the row only when the row doesn't already name that instance, keeps the instance the row named, if any, with the Kubernetes Node UID the row held, then overwrites it. A writer that waited supersedes what the first one committed. A superseded row is dated by clock_timestamp() as it is written. A first instance, the same instance again and a UID change alone write no superseded row; no instance leaves a recorded one alone.
register_k8s_node runs it before the node_k8s upsert overwrites the UID, and inserts a new row with its instance.
Every registration reads it from the Node's AWS providerID: Kubernetes node sync, the admin inventory listing and pod placement each pass the instance of the Node they register, so each registration writes the Node's UID and its instance together.
The providerID parser moves from the cluster controller's ASG terminator into pplx-space-k8s-node-id as Ec2InstanceId, accepting the same forms.
Validation
At this head (CI's test profile, Postgres fixtures required):
ci/scripts/run-rust-checks.sh fmt and clippy; cargo arch: no required findings.
pplx-space-k8s-node-id, pplx-space-node-registration-store, pplx-space-db-migrate, pplx-space-api, pplx-space-cluster-controller-server, --all-features: 3879 passed, 0 failed. The 16 privileged ones, as root: 16 passed.
Full inventory (run-rust-checks.sh tests-unprivileged, then tests-privileged as root): 12534 run, 12487 passed, 47 failed. The 47 are process, namespace, cgroup and filesystem tests the local container blocks, all in crates this stack doesn't touch. Doctests, the M1 SDK check and feature isolation pass; 0 test-dependency skips; the duration budget passes.
registration: first instance, the same one, another one, none, a tombstoned node, the drain clear apart from supersession;
concurrent writers, two registrations or direct calls of the store function in each pairing; this test passed 30 of 30 runs with --retries 0, slowest 0.14 s;
a replacement dated when it is written;
node sync: an AWS providerID records the Node's instance on a new row, and none or Kind's leaves a recorded instance alone; the admin listing and pod placement: an AWS providerID supersedes the row's instance, and none or Kind's leaves it;
the providerID parser.
Each new test was run against a mutation of the code it covers and failed: NOW() for clock_timestamp(), None for the listing's or placement's instance, and the old wait probe inside the holder's transaction, which times out once the waiter connects late.
Local Kind (Kubernetes substrate, providerIDs kind://…, log_statement = 'all'), at this head: local.forced_drain_evacuates_sandbox, local.gentle_drain_leaves_sandbox_resident, local.node_ctl_fence_refuses_and_reconciles and local.terminate_gate_refuses_a_held_node passed in each of two runs. In the second, with the statement log streamed, the registration upsert ran 44 times, each with $4 = NULL: 24 from pod placement, 16 from node sync, 4 from an admin nodes:refresh-status listing. No record_k8s_node_instance statement ran. Afterwards no node_k8s row names an instance and the superseded table is empty.
Not validated: no AWS providerID ran outside unit and Postgres tests.
Severity and risk
Severity: does not apply; new evidence recording, not a fix.
Risk: on AWS, node sync, the admin listing and pod placement start writing the new column and table. When a Node names an instance its row doesn't, they take the node_k8s row lock before the upsert and may write a superseded row. A failed recording fails that registration, listing or placement like any other statement in its transaction. The inventory listing also serves fork worker selection, so a failed recording there fails that selection too. Placement's lock order (nodes, node_k8s, then sandboxes) does not change. Without an AWS providerID nothing new is written. Roll back the binaries first, then the down migration, which drops the table and column.
Rollout
Deploy #1686's migration before these binaries. While older api binaries still run, they register a Node's UID without its instance.
node_k8s_superseded_instances rows go with their node_k8s row, which goes with its nodes row (ON DELETE CASCADE). The drain's terminate, the drained-node reap and the orphaned-node delete already delete Kubernetes node rows, so a node's history goes with its row, and a node registered again under the same id starts with none.
A superseded instance is kept with the UID its row held when the replacement was recorded. That is not the UID the instance ran under when the replacement Node had no providerID yet, or when an api from before this change registered the new UID first, as it can during the rollout.
Nothing asks EC2 about a recorded instance yet; that comes with its first caller.
AI assistance: Claude Code made the change, ran the validation and drafted this description. A human reviews before merge.
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Walkthrough
The change adds shared parsing for EC2 instance IDs in AWS Kubernetes provider IDs. Kubernetes node registration records the current instance and preserves the previous instance and node UID when they change. Inventory and pod-placement flows pass optional instance IDs to persistence. Node-drain termination uses the shared parser.
Merge Risk: Moderate · previous review fd814
The change records each Kubernetes node's EC2 instance and keeps the history of replaced instances. Nothing reads these fields yet, so user impact is limited. Because it adds new database writes in the storage layer, confirm that the new Postgres tests pass in CI and that the migration from #1686 is deployed first.
Security architecture risk: Low · up to fd814
The change records node-to-instance observations without changing the inspected authorization or termination decisions. Replacement history is transactionally contained, but missing provider IDs and mixed-version writers can leave identity associations stale. Production rollout ordering remains unverified.
Retained concerns
No architecture-level concerns identified.
Security review details
Security Blast Radius
inferred — The new durable write surface is node registration and its replacement history in control-plane PostgreSQL, including transactions that also persist sandbox placement. The inspected AWS termination authority remains unchanged; effective production account, region, IAM, and database-role exposure were not established.
Trust Boundaries and Controls
observed — Kubernetes providerID remains asserted identity rather than independent EC2 attestation. The existing termination path checks the terminating phase, fetches the live Node, and rejects differing stored and current UIDs when both are present before invoking AWS. The parser replacement preserves this pre-existing trust model.
Resilience and Maintainability Implications
observed — Registration retains substrate-ownership and tombstone gates. Differing instance reports lock the current row and archive its predecessor before replacement; identical reports write no history. API callers commit only after the complete operation succeeds, containing partial writes within the caller transaction. The store explicitly requires rollback after any registration error.
Hardening Proposals
proposed — Before using these stored associations for authorization or destructive cloud operations, define freshness and provenance requirements covering missing provider IDs, mixed-version writers, stale observations, and account/region ownership. Treat the stored values as observations until those requirements are enforced.
Caution
Pre-merge checks failed
Please resolve all errors before merging. Addressing warnings is optional.
Ignore (reviewers only)
Failed checks: 1 error
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Status
Explanation
Resolution
Weakened Safeguards Are Justified
Three new Clippy suppressions lack a specific reason: - crates/l40_api/api/src/controllers/substrate/kubernetes/store/node_inventory.rs:13 suppresses too_many_arguments. - `crates/l40_api/api/src/…
Remove each suppression or document a specific reason for it in the PR description, an adjacent comment, or the attribute.
Passed checks: 5 passed
Check name
Status
Explanation
Title check
The title starts with the lowercase area it touches (node-registration-store) followed by a colon, then a lowercase verb-led summary of what merging does: "record each Kubernetes node's EC2 instance".…
Description Follows The Pr Template
The description contains all four required items: Summary, Validation with results, Severity and risk, and an AI assistance line naming the tool and its contributions.
Bug Fixes Name A Regression Test
This PR adds instance recording; it does not fix an existing application defect. The moved provider-ID parser retains its previous behavior. The check does not apply.
Agent Tooling Runs No New Commands
The diff changes Rust source, tests, and Cargo dependencies. It does not change agent manifests, skills, guideline files, or files referenced by the plugin manifests.
Public-Safe Content
The title, description, and diff contain no identified public-safety violations. The instance IDs and addresses in the diff are test fixtures. The validation measurements describe local tests.
Full details: Title check
Explanation
The title starts with the lowercase area it touches (node-registration-store) followed by a colon, then a lowercase verb-led summary of what merging does: "record each Kubernetes node's EC2 instance". It matches the required format, and the summary matches the main change in the changeset, which records a node's EC2 instance in node_k8s.instance_id via the registration store. It has no trailing period, ticket ID, or internal link.
Full details: Weakened Safeguards Are Justified
Explanation
Three new Clippy suppressions lack a specific reason: - crates/l40_api/api/src/controllers/substrate/kubernetes/store/node_inventory.rs:13 suppresses too_many_arguments. - crates/l40_api/api/src/controllers/substrate/kubernetes/store/pod_placement.rs:182 suppresses too_many_arguments. - crates/l30_storage/node/registration/store/src/tests.rs:460 suppresses type_complexity. The deleted provider ID parsing test has an equivalent replacement.
Resolution
Remove each suppression or document a specific reason for it in the PR description, an adjacent comment, or the attribute.
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only still-valid issues, skip the rest with a brief reason, keep changes
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The dead-node check finds a node's instance in EC2 by its private DNS
name. EC2 forgets a terminated instance about an hour after it
terminates, so an old dead node returns no match, as a wrong region,
account or name does, and a same-IP replacement reuses the node id and
answers for the new instance. Nothing recorded which instance a node ran
on, or which one it ran on before. The previous change added
node_k8s.instance_id and node_k8s_superseded_instances for that; this
one writes them.
record_k8s_node_instance, private to the store, writes both in the
caller's transaction: it locks the row only when the row doesn't already
name that instance, keeps the instance the row named, if any, with the
Kubernetes Node UID the row held, then overwrites it, so a writer that
waited supersedes what the first one committed. The superseded row is
dated by clock_timestamp() as it is written, so it dates after a
replacement that committed while its transaction was open. A first
instance, the same instance again and a UID change alone write no
superseded row, and no instance leaves a recorded one alone.
register_k8s_node runs it before the node_k8s upsert overwrites the UID,
and inserts a new row with its instance.
Registration is the only writer. Kubernetes node sync, the admin
inventory listing and pod placement each read the instance from the Node
they register, through its AWS providerID, and pass it with that Node's
UID. The providerID parser moves from the cluster controller's ASG
terminator into pplx-space-k8s-node-id as Ec2InstanceId, accepting the
same forms.
When a Node names an instance its row doesn't, the listing and placement
now take the node_k8s row lock before the upsert and may write a
superseded row, and a failed recording fails that listing or placement
like any other statement in its transaction. The inventory listing also
serves fork worker selection, so a failed recording there fails that
selection too. Placement's lock order (nodes, node_k8s, then sandboxes)
does not change.
Nothing reads the new column or table. Without an AWS providerID, on
Kind and anywhere else, no instance is recorded, and registration writes
what it wrote before. The existing registration, node sync, listing and
placement tests pass with only the new argument added.
Closing for now: this piece is being rebuilt as part of one combined drain v2 build that drops several of the structures it adds. It will come back as part of a smaller set of PRs once that build passes end to end.
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Summary
Records the EC2 instance each Kubernetes node runs on, and the instances that one replaced, in the
node_k8s.instance_idcolumn and thenode_k8s_superseded_instancestable that #1686 adds. Nothing reads them yet.The dead-node check finds a node's instance in EC2 by its private DNS name. EC2 forgets a terminated instance about an hour after it terminates, so an old dead node returns no match, as a wrong region, account or name does, and a same-IP replacement reuses the node id and answers for the new instance.
record_k8s_node_instance(private topplx-space-node-registration-store) writes both in the caller's transaction: it locks the row only when the row doesn't already name that instance, keeps the instance the row named, if any, with the Kubernetes Node UID the row held, then overwrites it. A writer that waited supersedes what the first one committed. A superseded row is dated byclock_timestamp()as it is written. A first instance, the same instance again and a UID change alone write no superseded row; no instance leaves a recorded one alone.register_k8s_noderuns it before thenode_k8supsert overwrites the UID, and inserts a new row with its instance.pplx-space-k8s-node-idasEc2InstanceId, accepting the same forms.Validation
At this head (CI's test profile, Postgres fixtures required):
ci/scripts/run-rust-checks.sh fmtandclippy;cargo arch: no required findings.pplx-space-k8s-node-id,pplx-space-node-registration-store,pplx-space-db-migrate,pplx-space-api,pplx-space-cluster-controller-server,--all-features: 3879 passed, 0 failed. The 16 privileged ones, as root: 16 passed.run-rust-checks.sh tests-unprivileged, thentests-privilegedas root): 12534 run, 12487 passed, 47 failed. The 47 are process, namespace, cgroup and filesystem tests the local container blocks, all in crates this stack doesn't touch. Doctests, the M1 SDK check and feature isolation pass; 0 test-dependency skips; the duration budget passes.--retries 0, slowest 0.14 s;NOW()forclock_timestamp(),Nonefor the listing's or placement's instance, and the old wait probe inside the holder's transaction, which times out once the waiter connects late.kind://…,log_statement = 'all'), at this head:local.forced_drain_evacuates_sandbox,local.gentle_drain_leaves_sandbox_resident,local.node_ctl_fence_refuses_and_reconcilesandlocal.terminate_gate_refuses_a_held_nodepassed in each of two runs. In the second, with the statement log streamed, the registration upsert ran 44 times, each with$4 = NULL: 24 from pod placement, 16 from node sync, 4 from an adminnodes:refresh-statuslisting. Norecord_k8s_node_instancestatement ran. Afterwards nonode_k8srow names an instance and the superseded table is empty.Not validated: no AWS providerID ran outside unit and Postgres tests.
Severity and risk
Severity: does not apply; new evidence recording, not a fix.
Risk: on AWS, node sync, the admin listing and pod placement start writing the new column and table. When a Node names an instance its row doesn't, they take the
node_k8srow lock before the upsert and may write a superseded row. A failed recording fails that registration, listing or placement like any other statement in its transaction. The inventory listing also serves fork worker selection, so a failed recording there fails that selection too. Placement's lock order (nodes,node_k8s, thensandboxes) does not change. Without an AWS providerID nothing new is written. Roll back the binaries first, then the down migration, which drops the table and column.Rollout
Deploy #1686's migration before these binaries. While older api binaries still run, they register a Node's UID without its instance.
Stack
ac/admission-registration-admin-marker-reads).Merge in that order.
Not covered
node_k8s_superseded_instancesrows go with theirnode_k8srow, which goes with itsnodesrow (ON DELETE CASCADE). The drain's terminate, the drained-node reap and the orphaned-node delete already delete Kubernetes node rows, so a node's history goes with its row, and a node registered again under the same id starts with none.providerIDyet, or when an api from before this change registered the new UID first, as it can during the rollout.AI assistance: Claude Code made the change, ran the validation and drafted this description. A human reviews before merge.
🤖 Generated with Claude Code