I am trying to use/understand xargs for printing various details for some pods I have running in kubernetes across different namespaces. E.g. this command gives:
$ kubectl get pods -A | grep Error | awk '{print $2 " -n=" $1}'
my-pod-kf8xch6y-qc6ms-k6ww2 -n=my-ns
my-pod-kf8xlg64-g0ss7-mdv1x -n=my-ns
my-pod-kldslg64-polf7-msdw3 -n=another-ns
which is correct/expected.
When I add xargs to the above command I get:
$ kubectl get pods -A | grep Error | awk '{print $2 " -n=" $1}' | xargs kubectl $1 get pod $0 -oyaml | grep phase
Error from server (NotFound): pods "bash" not found
phase: Failed
phase: Failed
Which is actually the expected output but I don't understand
Error from server (NotFound): pods "bash" not found
why is bash passed to xargs?
We suggest to avoid xargs complications and combine maximum into single awk script.
kubectl get pods -A | awk '/Error/{system("kubectl get pod "$2" -n="$1" -oyaml")}'|grep phase
Or get even more detailed results:
kubectl get pods -A | awk '/Error/{system("kubectl get pod "$2" -n="$1" -oyaml")}'|grep -E "(^ name|^ phase)