Debugging containers that have no shell

31 pointsposted 3 months ago
by pploug
(docs.docker.com)

8 Comments

pploug

3 months ago

Docker Debug was previously a paid-for feature, now available for free since v4.49

kunley

3 months ago

Please note the analogous mechanism on kubernetes ("ephemeral containers") works only with the pod's shareProcessNamespace: true setting, which is usually off. So you won't be able to do this out of the box with your deployment already running on a typical stack

dixie_land

3 months ago

this is not true, `kubectl debug` attaches to the namespace of a container of your choosing (`--target` argument). You don't have to enable process namespace sharing at the pod level

kunley

3 months ago

Last time I've checked, kubectl debug would not attach if namespace sharing wasn't enabled in the first place. Has it changed? What k8s version are you using?

PS. Even without checking again, it would be surprising if it changed. Even the official documentation is mentioning that this is needed

pella

3 months ago

Only for "Docker Desktop 4.49 and later"

wrxd

3 months ago

[dead]