Find Docker container info from PID

Some of my cluster still running on Docker and this is how.

I wanted to know what is PID 25893 belongs to.

$ ./pidInfo.sh  25893
[
    {
  ...
  ...
  ... 
            "Labels": {
                "annotation.kubernetes.io/config.seen": "2021-03-23T11:40:30.983086928+08:00",
                "annotation.kubernetes.io/config.source": "api",
                "app": "elasticsearch-master",
                "chart": "elasticsearch",
                "controller-revision-hash": "elasticsearch-master-75b6469f4b",
                "io.kubernetes.container.name": "POD",
                "io.kubernetes.docker.type": "podsandbox",
                "io.kubernetes.pod.name": "elasticsearch-master-1",
                "io.kubernetes.pod.namespace": "client-stat-ts",
                "io.kubernetes.pod.uid": "fcadf0c6-b5c9-411a-bd8b-7718a74e187e",
                "release": "elasticsearch",
                "statefulset.kubernetes.io/pod-name": "elasticsearch-master-1"
            },
        },
  ...
  ...
  ...

Yes it’s elasticsearch-master node.

cat podInfo.sh

#!/bin/bash
CID=$(grep hostname /proc/$1/mountinfo |awk {'print $4'}|awk -F / {'print $3'})
docker inspect $CID

That is all.