You’re debugging in production again. You find a process in the output of
ps aux, but you need to know which pod created that process.
First, find the process id (PID). The PID is in the second column in the output of
ps aux. We’ll call this
Note: this is the same as
nsenter --target $PID --uts hostname.
Note: Make sure to run
nsenteron the same node as
nsenter is a utility for interacting
with Linux namespaces. We’re specifying
$PID as the process we want to target. For the
provided target process id, we want to enter the process’ UTS (UNIX Time-Sharing) namespace. The UTS
namespace is responsible for the
hostname and domain name. Fortunately, Kubernetes sets a hostname when creating a pod, where the
hostname is the pod’s name.
Finally, we execute the
hostname command in the process’ UTS namespace.
And we see the Kubernetes pod name printed.