How to retrieve the pod/container in which run a given process

Question

Using crictl in containerd, is there an easy way to find to which pod/container belongs a given process, using its PID on the host machine?

For example, how can I retrieve the name of the pod which runs the process below (1747):

root@k8s-worker-node:/# ps -ef | grep mysql
1000        1747    1723  0 08:58 ?        00:00:01 mysqld

Answer 1

Assuming that you're looking at the primary process in a pod, you could do something like this:

crictl ps -q | while read cid; do
    if crictl inspect -o go-template --template '{{ .info.pid }}' $cid | grep -q $target_pid; then
        echo $cid
    fi
done

This walks through all the crictl managed pods and checks the pod pid against the value of the $target_pid value (which you have set beforehand to the host pid in which you are interested).