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Certificate Loading

First, load your certificate file with .p12 extension to Kubernetes as a secret. 
kubectl create secret generic manager-tls --from-file=manager.p12 -n apinizer

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Finding Certificate Alias

To find the Alias of a certificate: 
keytool -list -v -keystore manager.p12 -storetype PKCS12

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Creating PKCS12 from JKS

To convert certificate in JKS format to PKCS12 format: 
keytool -genkeypair -alias <ALIAS> -keyalg RSA -keysize 4096 -storetype PKCS12 -keystore manager.p12 -validity 3650 -storepass <PASSWORD>
Add your file with .p12 extension to /etc/ssl/certs directory.

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Deployment Configuration

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Required Environment Variables

Variables that should be in deployment yaml definition:
VariableDescription
SSL_KEY_STOREPath of the key store containing SSL certificate. In our example, we want Spring Boot to search for this in classpath.
SSL_KEY_STORE_PASSWORDPassword used to access the key store.
SSL_KEY_STORE_TYPEType of the key store (Usage: PKCS12).
SSL_KEY_ALIASAlias identifying the key in the key store.
SSL_ENABLEDEnables Spring Boot application to use HTTPS protocol.
SERVER_PORTPort the server listens on. 8443 should be used.

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Example Deployment File

An example Api Manager deployment file: 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: manager
  namespace: apinizer
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: manager
      version: v1
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 75%
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: manager
        version: v1
    spec:
      automountServiceAccountToken: true
      volumes:
      - name: manager-tls
        secret:
          secretName: manager-tls
      containers:
      - env:
        - name: JAVA_OPTS
          value: ' -XX:MaxRAMPercentage=75.0 -Dlog4j.formatMsgNoLookups=true'
        - name: LOGGING_LEVEL_ROOT
          value: INFO
        - name: LOGGING_LEVEL_com_apinizer_manager
          value: INFO
        - name: SPRING_SERVLET_MULTIPART_MAX_FILE_SIZE
          value: 20MB
        - name: SPRING_SERVLET_MULTIPART_MAX_REQUEST_SIZE
          value: 50MB
        - name: SPRING_PROFILES_ACTIVE
          value: prod
        - name: SSL_KEY_STORE
          value: /etc/ssl/manager.p12
        - name: SSL_KEY_STORE_PASSWORD
          value: <PASSWORD>
        - name: SSL_KEY_STORE_TYPE
          value: PKCS12
        - name: SSL_KEY_ALIAS
          value: <ALIAS>
        - name: SSL_ENABLED
          value: "true"
        - name: SERVER_PORT
          value: "8443"
        - name: SPRING_DATA_MONGODB_URI
          valueFrom:
            secretKeyRef:
              key: dbUrl
              name: mongo-db-credentials
        - name: SPRING_DATA_MONGODB_DATABASE
          valueFrom:
            secretKeyRef:
              key: dbName
              name: mongo-db-credentials
        volumeMounts:
        - name: manager-tls
          mountPath: /etc/ssl
        image: apinizercloud/manager:<APINIZER_VERSION>
        imagePullPolicy: IfNotPresent
        lifecycle:
          preStop:
            exec:
              command:
              - /bin/sh
              - -c
              - sleep 10
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /apinizer/management/health
            port: 8443
            scheme: HTTPS
          initialDelaySeconds: 120
          periodSeconds: 30
          successThreshold: 1
          timeoutSeconds: 30
        name: manager
        ports:
        - containerPort: 8443
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /apinizer/management/health
            port: 8443
            scheme: HTTPS
          initialDelaySeconds: 120
          periodSeconds: 30
          successThreshold: 1
          timeoutSeconds: 30
        resources:
          limits:
            cpu: 1
            memory: 3Gi
        securityContext:
          allowPrivilegeEscalation: true
          readOnlyRootFilesystem: false
          runAsGroup: 0
          runAsNonRoot: false
          runAsUser: 0
        startupProbe:
          failureThreshold: 3
          httpGet:
            path: /apinizer/management/health
            port: 8443
            scheme: HTTPS
          initialDelaySeconds: 90
          periodSeconds: 30
          successThreshold: 1
          timeoutSeconds: 30
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
---
apiVersion: v1
kind: Service
metadata:
  name: manager
  namespace: apinizer
  labels:
    app: manager
spec:
  selector:
    app: manager
  type: NodePort
  ports:
  - name: http
    port: 8443
    nodePort: 32843

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Certificate Creation

Steps to be applied to create your own certificate:
1
Creating Private Key
openssl genrsa -out server.key 2048
2
Creating CSR (Certificate Signing Request)
openssl req -new -key server.key -out server.csr
3
Creating Signed Certificate
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt
4
Converting to PKCS#12 Format
openssl pkcs12 -export -out manager.p12 -inkey server.key -in server.crt