Aleksei Sviridkin
527d4ea00f
Two instruments for the node-join failure the kubernetes-* suites keep hitting. Neither changes what the suites assert. The worker CPU capture now reads container_cpu_usage_seconds_total beside the CFS counters, and reads them twice a fixed interval apart instead of once. The throttled counters say a container met its ceiling and cannot say how much CPU it got, which are the two candidate explanations for a stalled worker: a guest held at a one-core ceiling, and a guest whose vCPU thread is rarely scheduled at all. Both leave throttled periods behind. Every counter involved accumulates from container start, so a single reading is an average over the whole uptime and no rate at all, and the profile under investigation is a guest that freezes for tens of seconds and then runs flat out: the average comes out low, the instantaneous figure comes out at the cap, and only the second separates it from a guest that is simply capped. The sandbox nodes are a new subject. The worker captures describe a cgroup, so a guest that is runnable and never scheduled looks from there like a guest that asked for nothing. Whether the sandbox node itself was given its turn is recorded only in the steal column of its own /proc/stat: no kubelet endpoint carries it, and crust-gather cannot reach it because PodSecurity refuses its node-shell Pod here, so the read goes over the Talos API, which is already how the report reaches those nodes for dmesg. The rows are captured verbatim with their column legend beside them rather than reduced to a percentage, because /proc/stat has no header, steal and guest sit next to each other, and guest is large on a node running VMs and already counted inside user. Both subjects are read on either side of one shared wait, so the pair pays it once. The wait is not the interval either subject's counters span, though: each pass walks its own nodes and the other subject's pass falls between a subject's two readings, and on the run this exists for those passes are the slow part. Each capture therefore stamps both ends of its read, so a rate comes from subtracting stamps rather than from assuming the knob, and the width of those brackets is the uncertainty. That wait is a measurement interval rather than a stand-in for a condition nobody wrote a wait for, so the e2e conventions carve it out by name instead of marking it as a fixed timeout to be replaced. The pair is gated below the serial console rather than above it. Its ceiling is sixteen bounded reads plus the interval, which is most of the phase budget, and admission gates only when a collector may start, so above the console a run that hit those bounds would leave the console never started rather than merely cut short. The console is the only capture that survives a worker which never reached apid, which is the shape this failure usually takes. That overrun is inside the term the budget derivation already allows for one late admission, and a guard holds the pair's ceiling against it. No collector here may leave an empty directory, since an empty directory reads as a healthy node: a missing binary, a missing talosconfig, a listing that never answered, a node with no address and a read that was cut off each land as a named note or a COLLECTION-FAILED.txt. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Aleksei Sviridkin <3811295@gmail.com>
Chainsaw E2E tests
The Cozystack E2E app suite, written for Kyverno Chainsaw — a declarative, Kubernetes-native E2E test framework (CNCF, part of the Kyverno project; successor to KUTTL).
This directory replaces the per-app BATS suite that used to live in hack/e2e-apps/*.bats. The CI e2e job runs chainsaw test hack/e2e-chainsaw/ after make install-cozystack; cluster bootstrap (hack/e2e-prepare-cluster.bats, hack/e2e-install-cozystack.bats) and the OpenAPI checks (hack/e2e-test-openapi.bats) remain BATS.
Layout
hack/e2e-chainsaw/
├── .chainsaw.yaml # global Configuration (namespace, timeouts, JUnit report)
├── _lib/ # shell reused by the script-heavy suites
│ ├── run-kubernetes.sh # tenant Kubernetes bringup + LB/NFS/ouroboros checks
│ └── remediation-guard.sh
├── <app>/
│ ├── chainsaw-test.yaml # one or more Test definitions
│ └── <app>.yaml # the manifests the test applies
└── ...
Suites: postgres, bucket, mariadb, mongodb, redis, qdrant, clickhouse, kafka, etcd, openbao, harbor, foundationdb, external-dns, kuberture, vminstance, gateway, kubernetes-latest, kubernetes-previous, kubernetes-oidc-system, kubernetes-oidc-customconfig, securitygroup.
What Chainsaw buys over the BATS suite
- Readable tests — a list of resources and expected states, not shell control flow. The
timeout N sh -ec "until kubectl get ..."+kubectl waitpair that appeared ~100 times collapses into a singleassertthat polls existence and state together. - Distinguishable failure modes — "object never created", "created but never ready", and "wrong status" all surface as a structured diff instead of an opaque shell timeout.
- Automatic diagnostics —
catchblocks dump events,describe, and pod logs on any failure (the BATS suite only did this inharbor.bats, by hand). - Automatic cleanup — resources Chainsaw applied are deleted (and waited on) in reverse order;
finallycovers operator-created leftovers. - CI-ready output — a JUnit
chainsaw-report.xmlis emitted for the test summary.
Test anatomy
Each suite is a directory with a chainsaw-test.yaml (one or more Test docs) plus the manifests it applies. A step has try (operations: apply, assert, error, script, delete, …), optional catch (diagnostics on failure), and optional finally (teardown regardless of outcome).
Declarative suites assert on status.conditions and concrete fields. Inherently imperative suites keep their logic in script steps:
- openbao —
bao operator init/unsealviakubectl exec. - kuberture —
jqon Service annotations + external-dns split-horizon log assertions. - gateway — admission-rejection cases that need
kubectl --asimpersonation or error-message greps; the tenant apex is read from the namespacenamespace.cozystack.io/hostlabel at runtime so they pass on any host. - kubernetes-latest/previous — wrap
_lib/run-kubernetes.sh(Kamaji bringup, port-forward, LB/NFS/ouroboros). The scriptcds to the repo root (the test dir ishack/e2e-chainsaw/<suite>, so repo root is../../..).
Conventions / gotchas (Chainsaw v0.2.15)
- Condition asserts use the filter-as-list form, not the documented
[0]index:Thestatus: (conditions[?type == 'Ready']): - status: "True"(conditions[?type == 'Ready'])[0]: {status: "True"}idiom fails with "field not found in the input object". - A reading of a failure diff: the "actual" side is a projection onto the expected fields —
status: {}means the JMESPath expression failed, not that status is empty. Read the error line above the diff first. errorwith a bare resource ref (name only) asserts the resource does not exist (used for "PVC reclaimed", "no backup schedule", "child has no Gateway HR").scriptruns in the test directory with$NAMESPACEset to the config namespace (tenant-test).
Running locally
Requires a cluster with Cozystack installed and a tenant-test namespace (the environment hack/e2e-install-cozystack.bats produces). bucket additionally needs mc and nc on the host; kuberture/openbao/harbor need jq.
# install chainsaw
go install github.com/kyverno/chainsaw@latest # or: brew install kyverno/chainsaw/chainsaw
# run all suites (config picked up from .chainsaw.yaml)
cd hack/e2e-chainsaw
chainsaw test
# run a single suite
chainsaw test postgres/
kubernetes-latest/kubernetes-previous each bring up a full tenant Kubernetes cluster (~25 min, real worker nodes) and vminstance boots a nested VM — expect a long run for the full set.
CI integration
The e2e job in .github/workflows/pull-requests.yaml runs make -C packages/core/testing test-chainsaw (which execs chainsaw test hack/e2e-chainsaw/ inside the e2e sandbox) and uploads chainsaw-report.xml. The sandbox image (packages/core/testing/images/e2e-sandbox/Dockerfile) ships the chainsaw binary alongside kubectl/helm/mc/jq/nc.