kerberos-refresh

Using this in kubernetes as a sidecar container in a deployment:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: kinit-test
spec:
  selector:
    matchLabels:
      app: kinit-test
  template:
    metadata:
      labels:
        app: kinit-test
    spec:
      containers:
      - name: kerberos-refresh
        image: anoop/kinit
        env:
        - name: APPEND_OPTIONS
          value: svc_account@domain.com
        volumeMounts:
        - name: keytab-volume
          mountPath: /krb5/krb5.keytab
          subPath: svc_account.keytab 
        - name: kerberos-cache
          mountPath: /tmp
      - name: app
        image: app:v1.1
        ports:
        - containerPort: 443
        volumeMounts:
        - name: kerberos-volume
          mountPath: /etc/krb5.conf
          subPath: krb5.conf
        - name: keytab-volume
          mountPath: svc_account.keytab 
          readOnly: true
          subPath: svc_account.keytab
        - name: kerberos-cache
          mountPath: /tmp
      volumes:
      - name: kerberos-cache
        emptyDir: {}
      - name: kerberos-volume
        configMap:
          name: kerberos
      - name: keytab-volume
        secret:
          secretName: keytab

If using this inside a short lived pod like a job / cronjob, then I suggest you make this an initContainer and call kinit directly, like this:

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  labels:
    app: cronjob-test
    type: job
  name: job-test
spec:
  schedule: "0 7 * * *"
  successfulJobsHistoryLimit: 0
  failedJobsHistoryLimit: 1
  jobTemplate:
    spec:
      template:
        metadata:
          labels:
            app: job-test
            type: job
        spec:
          restartPolicy: OnFailure
          concurrencyPolicy: Forbid
          failedJobsHistoryLimit: 1
          initContainers:
          - name: kerberos-refresh
            image: anoop/kinit
            env:
            - name: APPEND_OPTIONS
              value: svc_account@domain.com
            command: ["kinit", "-V", "-k", "$(APPEND_OPTIONS)"]
            volumeMounts:
            - name: keytab-volume
              mountPath: /krb5/krb5.keytab
              subPath: svc_account.keytab 
            - name: kerberos-cache
              mountPath: /tmp
          containers:
          - name: app
            image: app:v1.1
            ports:
            - containerPort: 443
            volumeMounts:
            - name: kerberos-volume
              mountPath: /etc/krb5.conf
              subPath: krb5.conf
            - name: keytab-volume
              mountPath: svc_account.keytab 
              readOnly: true
              subPath: svc_account.keytab
            - name: kerberos-cache
              mountPath: /tmp
          volumes:
          - name: kerberos-cache
            emptyDir: {}
          - name: kerberos-volume
            configMap:
              name: kerberos
          - name: keytab-volume
            secret:
              secretName: keytab