Using snapshot process
The snapshot process gadget gathers information about running processes.
On Kubernetes
Let’s start this demo by creating a namespace:
$ kubectl create ns demo
namespace/demo created
There is not any running process in the demo namespace now:
$ kubectl gadget snapshot process -n demo
NODE NAMESPACE POD CONTAINER COMM PID UID GID
Create a pod on the demo namespace using the nginx image:
$ kubectl -n demo run mypod --image=nginx
pod/mypod created
$ kubectl wait -n demo --for=condition=ready pod/mypod
pod/mypod condition met
After the pod is running, we can try to get the list of running processes again:
$ kubectl gadget snapshot process -n demo
NODE NAMESPACE POD CONTAINER COMM PID UID GID
ubuntu-hirsute demo mypod mypod nginx 411928 0 0
ubuntu-hirsute demo mypod mypod nginx 411964 101 101
ubuntu-hirsute demo mypod mypod nginx 411965 101 101
ubuntu-hirsute demo mypod mypod nginx 411966 101 101
ubuntu-hirsute demo mypod mypod nginx 411967 101 101
ubuntu-hirsute demo mypod mypod nginx 411968 101 101
ubuntu-hirsute demo mypod mypod nginx 411969 101 101
ubuntu-hirsute demo mypod mypod nginx 411970 101 101
ubuntu-hirsute demo mypod mypod nginx 411971 101 101
We can see the different nginx process started within the container.
Execute an instance of sleep on the pod:
$ kubectl -n demo exec mypod -- /bin/sh -c "sleep 1000 &"
Now there is an additional sleep processes running in mypod:
$ kubectl gadget snapshot process -n demo
NODE NAMESPACE POD CONTAINER COMM PID UID GID
ubuntu-hirsute demo mypod mypod nginx 411928 0 0
ubuntu-hirsute demo mypod mypod nginx 411964 101 101
ubuntu-hirsute demo mypod mypod nginx 411965 101 101
ubuntu-hirsute demo mypod mypod nginx 411966 101 101
ubuntu-hirsute demo mypod mypod nginx 411967 101 101
ubuntu-hirsute demo mypod mypod nginx 411968 101 101
ubuntu-hirsute demo mypod mypod nginx 411969 101 101
ubuntu-hirsute demo mypod mypod nginx 411970 101 101
ubuntu-hirsute demo mypod mypod nginx 411971 101 101
ubuntu-hirsute demo mypod mypod sleep 412550 0 0
Delete the demo test namespace:
$ kubectl delete ns demo
namespace "demo" deleted
With ig
Create a container that runs sleep inside:
$ docker run --name test-snapshot-process -it --rm busybox /bin/sh -c 'sleep 100'
Run the snapshot process gadget, it’ll print all process in the container:
$ sudo ig snapshot process -c test-snapshot-process
CONTAINER COMM PID UID GID
test-snapshot-process sh 329491 0 0