The application is now exposed to a public endpoint thanks to the gateway.
We will now add TLS to our endpoint.
Create a self-signed certificate:
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=${PROXY_IP}"
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Create Kubernetes secret with generated certificate:
echo "apiVersion: v1
kind: Secret
metadata:
name: my-gateway-certificate
namespace: kuma-demo
type: kubernetes.io/tls
data:
tls.crt: "$(cat tls.crt | base64)"
tls.key: "$(cat tls.key | base64)"" | kubectl apply -f -
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Now update the gateway to use this certificate:
echo "apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
name: kuma
namespace: kuma-demo
spec:
gatewayClassName: kuma
listeners:
- name: proxy
port: 8080
protocol: HTTPS
tls:
certificateRefs:
- name: my-gateway-certificate" | kubectl apply -f -
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Check the call to the gateway:
curl -X POST -v --insecure "https://${PROXY_IP}:8080/increment"
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Which should output a successful call and indicate TLS is being used:
* Trying 127.0.0.1:8080...
* Connected to 127.0.0.1 (127.0.0.1) port 8080
* ALPN: curl offers h2,http/1.1
* (304) (OUT), TLS handshake, Client hello (1):
* (304) (IN), TLS handshake, Server hello (2):
* (304) (IN), TLS handshake, Unknown (8):
* (304) (IN), TLS handshake, Certificate (11):
* (304) (IN), TLS handshake, CERT verify (15):
* (304) (IN), TLS handshake, Finished (20):
* (304) (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / AEAD-CHACHA20-POLY1305-SHA256
* ALPN: server accepted h2
* Server certificate:
* subject: CN=127.0.0.1
* start date: Feb 9 10:49:13 2024 GMT
* expire date: Feb 8 10:49:13 2025 GMT
* issuer: CN=127.0.0.1
* SSL certificate verify result: self signed certificate (18), continuing anyway.
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://127.0.0.1:8080/increment
* [HTTP/2] [1] [:method: POST]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: 127.0.0.1:8080]
* [HTTP/2] [1] [:path: /increment]
* [HTTP/2] [1] [user-agent: curl/8.4.0]
* [HTTP/2] [1] [accept: */*]
> POST /increment HTTP/2
> Host: 127.0.0.1:8080
> User-Agent: curl/8.4.0
> Accept: */*
>
< HTTP/2 200
< x-powered-by: Express
< content-type: application/json; charset=utf-8
< content-length: 42
< etag: W/"2a-BZZq4nXMINsG8HLM31MxUPDwPXk"
< date: Fri, 09 Feb 2024 13:41:11 GMT
< x-envoy-upstream-service-time: 19
< server: Kuma Gateway
< strict-transport-security: max-age=31536000; includeSubDomains
<
* Connection #0 to host 127.0.0.1 left intact
{"counter":5,"zone":"local","err":null}%
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Note that we’re using --insecure as we have used a self-signed certificate.