if my target pods is kubernetes coredns, i can not find shared pid and mnt namespace, Because there is no shell, command line operations cannot be executed

[sun363587351]

[root@master ~]# cdebug exec --namespace=kube-system -it pod/coredns-5cd85ddb9f-ls5dl
Debugger container name: cdebug-47f86597
Starting debugger container...
Waiting for debugger container...
Attaching to debugger container...
If you don't see a command prompt, try pressing enter.
/ # ps aux
PID USER TIME COMMAND
1 root 0:00 sh /.cdebug-entrypoint.sh
11 root 0:00 sh
12 root 0:00 ps aux

[sun363587351]

if i use kubectl debug ,i can find shared pid and mnt namesapce.
kubectl debug coredns-5cd85ddb9f-ls5dl -it --image=netshoot --image-pull-policy=IfNotPresent --target=coredns -n kube-system
coredns-5cd85ddb9f-ls5dl  ~  ps aux
PID USER TIME COMMAND
1 root 3:01 /coredns -conf /etc/coredns/Corefile
55 root 0:01 zsh
119 root 0:00 ps aux

[iximiuz]

Thanks for the report! The reason for you not seeing the expected processes is because you're targeting the Pod and not the concrete container inside of it. Could you try cdebug exec --namespace=kube-system -it pod/coredns-5cd85ddb9f-ls5dl/coredns instead? (notice the /coredns addition).

[sun363587351]

Thanks for the report! The reason for you not seeing the expected processes is because you're targeting the Pod and not the concrete container inside of it. Could you try cdebug exec --namespace=kube-system -it pod/coredns-5cd85ddb9f-ls5dl/coredns instead? (notice the /coredns addition).

I do it,but doesn't works. and it say no coredns

[iximiuz]

Could you please provide the output of the kubectl -n kube-system get pod coredns-5cd85ddb9f-ls5dl -o yaml command?

[long904]

cdebug exec -it --image busybox:musl --namespace=kube-system pod/coredns-c97d8fd78-kg4s5/coredns

Debugger container name: cdebug-860ce1e2
Starting debugger container...
Waiting for debugger container...
sh: can't open no: no such file
cdebug: Debugger container "cdebug-860ce1e2" terminated: Error - (exit code: 1).

Ran into the same problem, getting into the coredns container reported an error. If you don't add coredns, there is no problem

Thanks for the report! The reason for you not seeing the expected processes is because you're targeting the Pod and not the concrete container inside of it. Could you try cdebug exec --namespace=kube-system -it pod/coredns-5cd85ddb9f-ls5dl/coredns instead? (notice the /coredns addition).