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fix: permanent DNS fix via daemon.json + CoreDNS, restart=always for kind container

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Szymon Wałachowski 2026-04-01 22:19:11 +02:00
parent 601a0328b8
commit 89f26e1dd1
3 changed files with 7 additions and 4 deletions
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6
RUNBOOK.md
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@ -136,11 +136,13 @@ kubectl exec -it -n forgejo deployment/forgejo-runner -- \
### After server restart (if pods have ImagePullBackOff) ### After server restart (if pods have ImagePullBackOff)
Kind container loses its DNS config on restart: This should no longer happen — `/etc/docker/daemon.json` is configured with `"dns": ["8.8.8.8"]` to prevent the router's broken IPv6 DNS from being injected into containers. The kind container also has `restart=always` so it auto-starts with Docker.
If it does happen anyway (e.g. daemon.json was reset), quick fix:
```bash ```bash
docker exec szymicluster-control-plane bash -c 'echo "nameserver 8.8.8.8" > /etc/resolv.conf' docker exec szymicluster-control-plane bash -c 'echo "nameserver 8.8.8.8" > /etc/resolv.conf'
kubectl delete pods -n argocd --all kubectl delete pods -A --field-selector=status.phase!=Running 2>/dev/null
``` ```
### Checking overall health ### Checking overall health

3
k8s/deploy-infrastructure.sh
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@ -6,7 +6,8 @@ cd "$SCRIPT_DIR/.."
echo "=== Deploying Infrastructure ===" echo "=== Deploying Infrastructure ==="
echo "0. Fixing kind container DNS (prevents ImagePullBackOff on IPv6-only DNS)..." echo "0. Configuring kind container restart policy and DNS..."
docker update --restart=always szymicluster-control-plane
docker exec szymicluster-control-plane bash -c 'echo "nameserver 8.8.8.8" > /etc/resolv.conf' docker exec szymicluster-control-plane bash -c 'echo "nameserver 8.8.8.8" > /etc/resolv.conf'
echo "1. Creating required host data directories..." echo "1. Creating required host data directories..."

2
k8s/infrastructure/coredns/coredns-custom.yaml
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@ -25,7 +25,7 @@ data:
ttl 30 ttl 30
} }
prometheus :9153 prometheus :9153
forward . /etc/resolv.conf { forward . 8.8.8.8 8.8.4.4 {
max_concurrent 1000 max_concurrent 1000
} }
cache 30 { cache 30 {