install-test: one cluster per matrix leg, and a pinned kubectl
Two assumptions about the runner environment, both found by the Gitea probe of #225 and both wrong on GitHub as well - they simply could not show there. CLUSTER NAME. Every leg created a cluster called "install-test". On GitHub each matrix leg gets its own VM with its own Docker daemon, so two legs never saw each other and the fixed name looked fine for two years. Gitea runs all legs of a matrix CONCURRENTLY in ONE job on ONE daemon, and there it collides immediately: one leg logs "Re-using existing network 'k3d-install-test'", the other dies on "The container name /k3d-install-test-server-0 is already in use", and then the first leg's rollback deletes the shared network under the second. Two red legs, and neither message names the cause. The cluster is now named after the chart, in the create step and in the delete step - a blanket cleanup would tear down the neighbour's cluster, which was the half of the collision that turned one failure into two. ci/run-install-test.sh never touches k3d, so nothing else had to move. The bare chart name rather than a prefixed one, measured not assumed: k3d v5.9.0 accepts a cluster name of 32 characters and rejects 33 ("Cluster name must be <= 32 characters"), and the longest chart here is calibre-web-automated at 21. "install-test-<chart>" would be 34 - it would break that one chart and no other, which is worse than the fixed name because it only sometimes breaks. A guard states the limit instead of leaving it to be rediscovered. KUBECTL. It was inherited from the runner image. The Gitea image has none ("kubectl: command not found", 0 seconds into the chart install), but that is how it was noticed, not why it is being changed: a client version that arrives with the image drifts with every image rebuild, and an install-test should run against a known one. GitHub's image carrying one only makes the drift invisible there. Pinned to v1.35.5 to match the K3S_IMAGE it talks to, tracked by Renovate the same way TRIVY_VERSION is, and guarded against skew: kubectl supports one minor away from the server, Renovate moves KUBECTL_VERSION on its own, and K3S_IMAGE is tracked by nothing. Dry run proves both directions - the rule extracts (kubernetes/kubernetes, github-releases) and it fires (from v1.34.0 the lookup offers v1.37.0, minor). That same measurement shows the guard is not theoretical: Renovate jumps several minors in one PR, so it will go red on purpose, naming which pin to move.
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@@ -285,11 +285,51 @@ jobs:
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env:
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K3D_VERSION: v5.9.0
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K3S_IMAGE: docker.io/rancher/k3s:v1.35.5-k3s1
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# Pinned rather than taken from the runner image. The argument is not
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# "Gitea's image has no kubectl" - that is only how it was noticed. A
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# kubectl inherited from whatever the image happens to ship drifts
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# unannounced with every image rebuild, and an install-test is supposed
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# to run against a KNOWN client. That GitHub's hosted image already
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# carries one does not make the pin unnecessary; it only makes the drift
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# invisible there. The value mirrors K3S_IMAGE above (v1.35.5), which is
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# the cluster this client talks to.
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# renovate: datasource=github-releases depName=kubernetes/kubernetes
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KUBECTL_VERSION: v1.35.5
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steps:
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- name: "Checkout Repository"
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uses: actions/checkout@v7
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- name: "Install Helm"
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uses: azure/setup-helm@v5
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- name: "Install kubectl"
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run: |
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# kubectl and the cluster are a pair: the client talks to the server
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# K3S_IMAGE starts, and Kubernetes supports at most one minor of
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# skew between them. Renovate updates KUBECTL_VERSION on its own
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# while K3S_IMAGE is tracked by nothing, so without this check the
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# two drift apart until the client is talking to a server it no
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# longer supports - silently, because kubectl only warns. And it is
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# not theoretical: measured by dry run, a lookup from v1.34.0
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# offers v1.37.0 in ONE step, because Renovate fills the non-major
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# bucket with the newest candidate rather than walking the minors.
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# So this check WILL fire one day, on purpose, with a message that
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# says which of the two pins to move.
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#
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# Deliberately not solved with an allowedVersions constraint pinning
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# kubectl to the k3s minor: that is the nginx trap the README
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# describes - a filter that silently stops offering updates the day
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# the other side moves. A loud failure beats a quiet freeze.
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read -r KMAJ KMIN <<<"$(printf '%s' "$KUBECTL_VERSION" | sed -E 's/^v([0-9]+)\.([0-9]+).*/\1 \2/')"
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read -r SMAJ SMIN <<<"$(printf '%s' "$K3S_IMAGE" | sed -E 's/.*:v([0-9]+)\.([0-9]+).*/\1 \2/')"
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SKEW=$(( (KMAJ * 100 + KMIN) - (SMAJ * 100 + SMIN) ))
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if [ "${SKEW#-}" -gt 1 ]; then
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echo "::error::kubectl $KUBECTL_VERSION and k3s $K3S_IMAGE are more than one minor apart. Bump K3S_IMAGE to match, or pin KUBECTL_VERSION back."
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exit 1
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fi
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curl -sSfL -o /tmp/kubectl "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl"
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mkdir -p "$HOME/.local/bin"
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install -m 0755 /tmp/kubectl "$HOME/.local/bin/kubectl"
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echo "$HOME/.local/bin" >> "$GITHUB_PATH"
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"$HOME/.local/bin/kubectl" version --client
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# freesailarr is the one chart whose install-test needs credentials:
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# without a real Wireguard key gluetun never completes a handshake, and
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# behind its kill switch not a single app container becomes Ready. The key
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@@ -334,8 +374,37 @@ jobs:
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echo "Both VPN values arrived non-empty."
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- name: "Install k3d"
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run: curl -sSfL https://raw.githubusercontent.com/k3d-io/k3d/main/install.sh | TAG="$K3D_VERSION" bash
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# One cluster per matrix leg, named after the chart. It used to be the
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# fixed name "install-test", and that was wrong on GitHub too - it just
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# could not show there, because GitHub gives every matrix leg its own VM
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# with its own Docker daemon, so two legs never saw each other's
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# cluster. The environment hid the bug for two years rather than
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# preventing it. Gitea runs all legs of a matrix CONCURRENTLY in ONE job
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# on ONE daemon, and there the fixed name collides at once: measured on
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# the probe PR of #225, one leg logs "Re-using existing network
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# 'k3d-install-test'", the other dies on "The container name
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# /k3d-install-test-server-0 is already in use" - and then the first
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# leg's rollback deletes the shared network out from under the second,
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# which fails with "network k3d-install-test not found". Both legs red,
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# neither cause in either message. DO NOT put the fixed name back.
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#
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# Why the bare chart name and not a prefixed one: k3d rejects a cluster
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# name over 32 characters ("Cluster name must be <= 32 characters",
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# measured against k3d v5.9.0 - 32 passes, 33 fails), and every
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# container is named k3d-<cluster>-server-0 from it. The longest chart
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# here is calibre-web-automated at 21, so "install-test-<chart>" would
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# be 34 and break exactly that one chart and no other - the kind of
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# prefix that is worse than the fixed name because it only sometimes
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# breaks. The guard below states the limit instead of leaving it to be
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# rediscovered.
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- name: "Create k3d cluster"
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run: k3d cluster create install-test --image "$K3S_IMAGE" --wait --timeout 180s
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run: |
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CLUSTER="${{ matrix.chart }}"
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if [ "${#CLUSTER}" -gt 32 ]; then
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echo "::error::chart name '$CLUSTER' is ${#CLUSTER} characters and k3d allows at most 32 for a cluster name."
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exit 1
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fi
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k3d cluster create "$CLUSTER" --image "$K3S_IMAGE" --wait --timeout 180s
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# Every chart reaching this step is one the exclusion filter let through,
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# so the script's SKIP branch is never taken here - it exists for local
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# runs. The variables below are empty for every chart but the one that
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@@ -346,6 +415,10 @@ jobs:
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FREESAILARR_WG_KEY: ${{ steps.load-freesailarr-vpn.outputs.FREESAILARR_WG_KEY }}
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FREESAILARR_WG_ADDRESSES: ${{ steps.load-freesailarr-vpn.outputs.FREESAILARR_WG_ADDRESSES }}
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run: ci/run-install-test.sh "${{ matrix.chart }}"
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# Must carry the same per-leg name as the create step above: a blanket
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# cleanup, or the old fixed name, would tear down the neighbouring leg's
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# cluster on a runner that shares one Docker daemon - which is precisely
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# the half of the collision that turned one red leg into two.
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- name: "Delete k3d cluster"
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if: always()
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run: k3d cluster delete install-test || true
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run: k3d cluster delete "${{ matrix.chart }}" || true
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