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fix(ci,kubenuc): derive CoreDNS test-hosts and DNS checks from live Ingress objects #1846

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Merged
dark-vex merged 4 commits into from
Aug 10, 2026
Merged

fix(ci,kubenuc): derive CoreDNS test-hosts and DNS checks from live Ingress objects #1846

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7e954e3
fix(ci,kubenuc): derive CoreDNS test-hosts and DNS checks from live I…
dark-vex Aug 10, 2026
9c4b99e
ci: trigger cluster-test on this PR (no-op comment)
dark-vex Aug 10, 2026
6d810dc
revert: drop CI-trigger comment now that cluster-test verified green
dark-vex Aug 10, 2026
51da2af
Merge branch 'main' into fix/kubenuc-coredns-dynamic-host-discovery
dark-vex Aug 10, 2026
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64 changes: 43 additions & 21 deletions .github/workflows/validate-kubenuc.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -638,25 +638,36 @@ jobs:
exit 1
fi

set -o pipefail
echo "=== Discovering ingress hosts from live Ingress objects ==="
kubectl get ingress -A -o json \
| jq -r '[.items[].spec.rules[]?.host] | map(select(. != null and . != "")) | unique[]' \
> /tmp/discovered-ingress-hosts.txt

echo "=== Discovered $(wc -l < /tmp/discovered-ingress-hosts.txt) ingress host(s) for CoreDNS override ==="
cat /tmp/discovered-ingress-hosts.txt

if [ ! -s /tmp/discovered-ingress-hosts.txt ]; then
echo "WARNING: No ingress hosts discovered — CoreDNS config skipped"
echo "Ingress app may not have been included in this test run"
exit 0
fi

HOSTS_OVERRIDE=$(awk -v ip="$INGRESS_IP" '{print ip, $0}' /tmp/discovered-ingress-hosts.txt)

echo "=== Applying CoreDNS configuration with IP: $INGRESS_IP ==="
cat <<EOF | kubectl apply -f -
{
cat <<CMEOF
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns-custom
namespace: kube-system
data:
tst.example.invalid.override: |
${INGRESS_IP} harbor.tst.example.invalid
${INGRESS_IP} jenkins.tst.example.invalid
${INGRESS_IP} cloud.tst.example.invalid
${INGRESS_IP} portainer.tst.example.invalid
${INGRESS_IP} tv.tst.example.invalid
${INGRESS_IP} sso.tst.example.invalid
${INGRESS_IP} s3-api.tst.example.invalid
${INGRESS_IP} nx.s3.tst.example.invalid
${INGRESS_IP} repo.tst.example.invalid
EOF
discovered-hosts.override: |
CMEOF
echo "$HOSTS_OVERRIDE" | sed 's/^/ /'
} | kubectl apply -f -

cat <<EOF | kubectl apply -f -
apiVersion: v1
Expand All @@ -677,7 +688,7 @@ jobs:
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
hosts /etc/coredns/custom/tst.example.invalid.override {
hosts /etc/coredns/custom/discovered-hosts.override {
fallthrough
}
prometheus :9153
Expand Down Expand Up @@ -722,19 +733,30 @@ jobs:
- name: Verify DNS resolution in cluster
if: contains(env.DEPLOY_APPS, 'haproxy-ingress')
run: |
set -o pipefail
echo "=== Discovering ingress hosts to verify ==="
kubectl get ingress -A -o json \
| jq -r '[.items[].spec.rules[]?.host] | map(select(. != null and . != "")) | unique[]' \
> /tmp/discovered-ingress-hosts.txt

if [ ! -s /tmp/discovered-ingress-hosts.txt ]; then
echo "WARNING: No ingress hosts discovered — DNS verification skipped"
exit 0
fi

echo "=== Testing DNS resolution from a test pod ==="
kubectl run dns-test --image=busybox:1.28 --rm -it --restart=Never -- sh -c "
echo 'Testing DNS resolution:'
nslookup harbor.tst.example.invalid
echo ''
nslookup jenkins.tst.example.invalid
echo ''
nslookup cloud.tst.example.invalid
" || echo "DNS test completed"
NSLOOKUP_SCRIPT=$(awk '{ print "echo Testing " $0 ":"; print "nslookup " $0 " || exit 1"; print "echo" }' /tmp/discovered-ingress-hosts.txt)
DNS_TEST_STATUS=0
kubectl run dns-test --image=busybox:1.28 --rm -i --restart=Never -- sh -c "$NSLOOKUP_SCRIPT" || DNS_TEST_STATUS=$?

echo "=== Checking CoreDNS logs ==="
kubectl -n kube-system logs -l k8s-app=kube-dns --tail=50

if [ "$DNS_TEST_STATUS" -ne 0 ]; then
echo "ERROR: DNS resolution failed for one or more discovered ingress hosts"
exit 1
fi

- name: Run Robot Framework ingress tests
if: contains(env.DEPLOY_APPS, 'haproxy-ingress')
run: |
Expand Down