The following Kubernetes manifests would issue LetsEncrypt TLS certificates for use with an sample node.js https web app. In this example, the Cert Manager operator issues certificates from LetsEncrypt with the help of ACME DNS validation instead of HTTP validation. Web traffic to the sample node.js website is encrypted through TLS and we do not use Kubernetes Ingress in this example.
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December 1, 2022 11:43
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Issuing LetsEncrypt Certificates using (OpenShift) Cert Manager Operator
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apiVersion: cert-manager.io/v1 | |
kind: Issuer | |
metadata: | |
name: letsencrypt | |
spec: | |
acme: | |
server: https://acme-v02.api.letsencrypt.org/directory | |
email: "swghosh@redhat.com" | |
privateKeySecretRef: | |
name: letsencrypt | |
solvers: | |
- dns01: | |
route53: | |
accessKeyID: <AWS_ACCESS_KEY_ID> | |
hostedZoneID: <ROUTE53_HOSTED_ZONE_ID> | |
region: us-east-1 | |
secretAccessKeySecretRef: | |
name: "aws-secret" | |
key: "awsSecretAccessKey" | |
selector: | |
dnsNames: | |
- 'cert-hello.devcluster.openshift.com' | |
--- | |
apiVersion: v1 | |
kind: Secret | |
metadata: | |
name: "aws-secret" | |
type: Opaque | |
data: | |
awsSecretAccessKey: <AWS_SECRET_ACCESS_KEY> | |
--- | |
apiVersion: cert-manager.io/v1 | |
kind: Certificate | |
metadata: | |
name: cert-hello-tls | |
spec: | |
isCA: false | |
commonName: "cert-hello.devcluster.openshift.com" | |
secretName: cert-hello-tls-cert | |
dnsNames: | |
- "cert-hello.devcluster.openshift.com" | |
issuerRef: | |
name: letsencrypt | |
kind: Issuer |
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apiVersion: v1 | |
kind: ConfigMap | |
metadata: | |
name: cert-hello-server-js-script | |
namespace: default | |
data: | |
server.js: |- | |
const https = require('https'); | |
const fs = require('fs'); | |
const options = { | |
key: fs.readFileSync('/etc/cert/tls.key'), | |
cert: fs.readFileSync('/etc/cert/tls.crt') | |
}; | |
https.createServer(options, function (req, res) { | |
res.writeHead(200); | |
res.end("hello world\n"); | |
}).listen(8443); | |
--- | |
apiVersion: apps/v1 | |
kind: Deployment | |
metadata: | |
name: cert-hello | |
namespace: default | |
spec: | |
selector: | |
matchLabels: | |
app: cert-hello | |
template: | |
metadata: | |
labels: | |
app: cert-hello | |
spec: | |
volumes: | |
- name: server-js-cm | |
configMap: | |
name: cert-hello-server-js-script | |
items: | |
- key: server.js | |
path: server.js | |
- name: tls-secret | |
secret: | |
secretName: cert-hello-tls-cert | |
securityContext: | |
runAsUser: 999 | |
containers: | |
- name: cert-hello | |
image: node:alpine | |
command: | |
- "node" | |
- "/src/server.js" | |
resources: | |
limits: | |
memory: "128Mi" | |
cpu: "500m" | |
securityContext: | |
allowPrivilegeEscalation: false | |
seccompProfile: | |
type: RuntimeDefault | |
runAsNonRoot: true | |
capabilities: | |
drop: | |
- "ALL" | |
ports: | |
- containerPort: 8443 | |
volumeMounts: | |
- name: server-js-cm | |
mountPath: /src/server.js # This should be your final destination | |
subPath: server.js | |
- name: tls-secret | |
mountPath: /etc/cert | |
--- | |
apiVersion: v1 | |
kind: Service | |
metadata: | |
name: cert-hello | |
namespace: default | |
spec: | |
selector: | |
app: cert-hello | |
ports: | |
- port: 443 | |
targetPort: 8443 |
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apiVersion: operator.openshift.io/v1 | |
kind: IngressController | |
metadata: | |
name: tls-apps | |
namespace: openshift-ingress-operator | |
spec: | |
defaultCertificate: | |
name: cert-hello-tls-cert | |
domain: "tls-apps.devcluster.openshift.com" | |
replicas: 2 |
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