Debugging containers that have no shell

Debugging containers that have no shell(docs.docker.com)

31 points by pploug 194 days ago | 7 comments

pploug 194 days ago |

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

kunley 186 days 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 185 days 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 185 days 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

benterix 186 days ago |

Does podman contain or plan to implement something similar? Seems very useful.

kitd 186 days ago | |

Not that I could find. There is always the option to use a sidecar container, eg:

https://matthewsanabria.dev/posts/no-shell-for-you-container...

https://iximiuz.com/en/series/mastering-container-debugging/

pella 186 days ago |

Only for "Docker Desktop 4.49 and later"