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How to fix invalid host in Kubernetes | DevErrors

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How to fix invalid host in Ingress

How to fix invalid host in Kubernetes

KubernetesBEGINNERMEDIUM

Error when Ingress host has invalid format

What this error means

Host violates DNS naming rules

Typical symptoms

validation error
validation failed
not created
422 error
describe error

Common causes

uppercase
spaces
special chars
leading hyphen
double dots
too long

How to fix "invalid host"

1Check host

kubectl get ingress -o yaml | grep host

2Verify format

Lowercase alphanumeric hyphens

3Fix host

Convert to lowercase

4Use wildcard

spec.rules.host: *.example.com

Validate

Advanced notes

RFC 1123 compliant. Max 253 total, 63 per label. Lowercase letters, digits, hyphens.

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Official resources & further reading

📚Kubernetes Official Documentation
📖
Kubernetes Docs: Ingress(Official Docs)
📖
NGINX Ingress: TLS Configuration(Official Docs)
🐙
GitHub: Ingress controller not honouring host level tls certificate(GitHub)
💬
Stack Overflow: NGINX Ingress Controller not picking up TLS Certificates(Stack Overflow)

5

kubectl apply should work

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