kubectl patch localtime

To add these settings to deployment

        volumeMounts:
        - mountPath: /etc/localtime
          name: zoneinfo
          readOnly: true
          subPath: Asia/Bangkok

      volumes:
      - hostPath:
          path: /usr/share/zoneinfo
          type: ""
        name: zoneinfo

Use below kubectl to patch — add the first container volumeMounts and volumes

kubectl patch --type='json' -p='[
  {"op": "add", "path": "/spec/template/spec/containers/0/volumeMounts", "value": [{"name": "zoneinfo", "mountPath": "/etc/localtime", "subPath": "Asia/Bangkok", "readOnly": true}] },
  {"op": "add", "path": "/spec/template/spec/volumes", "value": [{"name": "zoneinfo", "hostPath": {"path": "/usr/share/zoneinfo"}}] }
]' deployment/nginx

Example:

$ k exec -it deployments/nginx -- date
Mon Jun  5 03:50:09 UTC 2023
$ kubectl patch --type='json' -p='[
  {"op": "add", "path": "/spec/template/spec/containers/0/volumeMounts", "value": [{"name": "zoneinfo", "mountPath": "/etc/localtime", "subPath": "Asia/Bangkok", "readOnly": true}] },
  {"op": "add", "path": "/spec/template/spec/volumes", "value": [{"name": "zoneinfo", "hostPath": {"path": "/usr/share/zoneinfo"}}] }
]' deployment nginx
deployment.apps/nginx patched
$ k exec -it deployments/nginx -- date
Mon Jun  5 10:50:25 +07 2023

that’s all