expose-service

name	expose-service
description	Expose a Kube-DC service externally via Gateway Route (HTTP/HTTPS/gRPC with auto TLS) or Direct EIP + LoadBalancer (any TCP/UDP). Includes decision guide for choosing the right exposure method.

Prerequisites

• Target service or deployment must exist in a project namespace
• For HTTPS: cert-manager Issuer must exist in the namespace

Decision Guide

Need	→ Method	Annotation
HTTP/HTTPS web app	Gateway Route	expose-route: "https"
Auto TLS certificate	Gateway Route	expose-route: "https"
gRPC service	Gateway Route	expose-route: "https" + route-port
TLS passthrough (app handles TLS)	Gateway Route	expose-route: "tls-passthrough"
SSH to VM	Direct EIP	bind-on-eip: "{eip-name}"
Game server (UDP)	Direct EIP	bind-on-eip: "{eip-name}"
Database external access	Direct EIP or Gateway	See create-database skill
Custom TCP protocol	Direct EIP	bind-on-eip: "{eip-name}"

Path A: Gateway Route (HTTP/HTTPS/gRPC)

Traffic flows through shared Envoy Gateway with auto DNS + TLS.

HTTPS (most common)

apiVersion: v1
kind: Service
metadata:
  name: {service-name}
  namespace: {project-namespace}
  annotations:
    service.nlb.kube-dc.com/expose-route: "https"
spec:
  type: LoadBalancer
  ports:
    - port: {port}
      targetPort: {port}
  selector:
    app: {app-name}

→ Auto hostname: {service-name}-{project-namespace}.kube-dc.cloud → Auto TLS: Let's Encrypt certificate provisioned automatically

Custom Hostname

annotations:
  service.nlb.kube-dc.com/expose-route: "https"
  service.nlb.kube-dc.com/route-hostname: "myapp.example.com"

You must configure DNS (CNAME or A record) to point to the gateway IP.

Custom TLS Certificate

annotations:
  service.nlb.kube-dc.com/expose-route: "https"
  service.nlb.kube-dc.com/tls-secret: "my-tls-secret"

gRPC Service

annotations:
  service.nlb.kube-dc.com/expose-route: "https"
  service.nlb.kube-dc.com/route-port: "50051"

TLS Passthrough

Application terminates TLS itself:

annotations:
  service.nlb.kube-dc.com/expose-route: "tls-passthrough"

Issuer Setup (Required for HTTPS)

apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: letsencrypt
  namespace: {project-namespace}
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: {email}
    privateKeySecretRef:
      name: letsencrypt-key
    solvers:
      - http01:
          ingress:
            ingressClassName: envoy

See @envoy-gateway-examples.yaml for complete examples.

Path B: Direct EIP + LoadBalancer (Any TCP/UDP)

Dedicated public IP, no Envoy. Application handles its own TLS/DNS.

Step 1: Create EIP

apiVersion: kube-dc.com/v1
kind: EIp
metadata:
  name: {eip-name}
  namespace: {project-namespace}
spec:
  externalNetworkType: public    # or: cloud

Step 2: Bind Service

apiVersion: v1
kind: Service
metadata:
  name: {service-name}
  namespace: {project-namespace}
  annotations:
    service.nlb.kube-dc.com/bind-on-eip: "{eip-name}"
spec:
  type: LoadBalancer
  ports:
    - port: {port}
      targetPort: {port}
      protocol: TCP    # or: UDP
  selector:
    app: {app-name}

See @eip-loadbalancer-examples.yaml for SSH, game server, and multi-port examples.

Annotations Quick Reference

Annotation	Values	Effect
service.nlb.kube-dc.com/expose-route	http, https, tls-passthrough	Create Gateway Route
service.nlb.kube-dc.com/route-hostname	FQDN	Override auto hostname
service.nlb.kube-dc.com/route-port	port number	Target port for gateway
service.nlb.kube-dc.com/tls-issuer	issuer name	cert-manager Issuer (default: letsencrypt)
service.nlb.kube-dc.com/tls-secret	secret name	User-provided TLS cert
service.nlb.kube-dc.com/bind-on-eip	EIP name	Bind LB to specific EIP
service.nlb.kube-dc.com/autodelete	"true"	Auto-delete EIP when service deleted

Verification

After exposing the service, run these checks:

Gateway Route

# 1. Check hostname was assigned
kubectl get svc {service-name} -n {project-namespace} -o jsonpath='{.metadata.annotations.service\.nlb\.kube-dc\.com/route-hostname-status}'
# Expected: {service-name}-{project-namespace}.kube-dc.cloud

# 2. Check TLS certificate is issued (for HTTPS)
kubectl get certificate -n {project-namespace}
# Expected: READY=True

# 3. Test endpoint
curl -s -o /dev/null -w "%{http_code}" https://\{service-name\}-\{project-namespace\}.kube-dc.cloud
# Expected: HTTP status from your app (200, 301, etc.)

Direct EIP

# 1. Check EIP has allocated IP
kubectl get eip {eip-name} -n {project-namespace} -o jsonpath='{.status.ipAddress}'
# Expected: public IP address

# 2. Check service has external IP
kubectl get svc {service-name} -n {project-namespace} -o jsonpath='{.status.loadBalancer.ingress[0].ip}'
# Expected: same IP as EIP

# 3. Test connectivity
nc -zv {external-ip} {port}
# Expected: Connection succeeded

Success: Hostname assigned (Gateway) or external IP allocated (EIP), endpoint reachable. Failure:

• No hostname: check Issuer exists, service type is LoadBalancer
• No EIP IP: kubectl describe eip {eip-name} -n {project-namespace}
• Connection refused: verify selector matches pods, targetPort is correct

Safety

• Never mix Gateway Route and Direct EIP on the same service
• FIP and LoadBalancer on the same target are mutually exclusive
• Verify Issuer exists before using expose-route: https
• Prefer Gateway Route for HTTP workloads (cost-effective, auto TLS)
• Use Direct EIP only when you need raw TCP/UDP access