Bug: `K3SContainer` calls `get_container_host_ip` in constructor before container is started

[ndellosa95]

Describe the bug

K3SContainer calls get_container_host_ip in its __init__ method here and here before the container is started, causing it to fail with an AssertionError here.

To Reproduce

from testcontainers.k3s import K3SContainer

with K3SContainer() as k3s:
     print("gonna throw an error before I even get here :(")

Runtime environment

I'm on an ARM Mac and this is in Python 3.12, but that shouldn't make a difference.

[alexanderankin]

If there is a bug, it was probably introduced with the new waiting strategies, thanks for reporting, I'll take a look

…

On Wed, Aug 13, 2025, 5:19 PM ndellosa95 ***@***.***> wrote: *ndellosa95* created an issue (testcontainers/testcontainers-python#861) <#861> *Describe the bug* K3SContainer calls get_container_host_ip in its __init__ method here and here <https://github.com/testcontainers/testcontainers-python/blob/main/modules/k3s/testcontainers/k3s/__init__.py#L45-L46> before the container is started, causing it to fail with an AssertionError here <https://github.com/testcontainers/testcontainers-python/blame/main/core/testcontainers/core/container.py#L229-L231> . *To Reproduce* from testcontainers.k3s import K3SContainer with K3SContainer() as k3s: print("gonna throw an error before I even get here :(") *Runtime environment* I'm on an ARM Mac and this is in Python 3.12, but that shouldn't make a difference. — Reply to this email directly, view it on GitHub <#861>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACECGJGKK2FYZLF55ITU6ML3NOTVJAVCNFSM6AAAAACD23I4WKVHI2DSMVQWIX3LMV43ASLTON2WKOZTGMYTSOJTGA3TQNY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[alexanderankin]

oh, seems like we have to re-think container modes - or k3s - the new container modes that try to help address dind/dood are not compatible with the k3s container. ill move the assert inside the if branches that need it, and then it will work by default (not dind or dood or whatever0

…

On Wed, Aug 13, 2025 at 6:07 PM David Ankin ***@***.***> wrote: If there is a bug, it was probably introduced with the new waiting strategies, thanks for reporting, I'll take a look On Wed, Aug 13, 2025, 5:19 PM ndellosa95 ***@***.***> wrote: > *ndellosa95* created an issue (testcontainers/testcontainers-python#861) > <#861> > > *Describe the bug* > > K3SContainer calls get_container_host_ip in its __init__ method here and > here > <https://github.com/testcontainers/testcontainers-python/blob/main/modules/k3s/testcontainers/k3s/__init__.py#L45-L46> > before the container is started, causing it to fail with an > AssertionError here > <https://github.com/testcontainers/testcontainers-python/blame/main/core/testcontainers/core/container.py#L229-L231> > . > > *To Reproduce* > > from testcontainers.k3s import K3SContainer > with K3SContainer() as k3s: > print("gonna throw an error before I even get here :(") > > *Runtime environment* > > I'm on an ARM Mac and this is in Python 3.12, but that shouldn't make a > difference. > > — > Reply to this email directly, view it on GitHub > <#861>, or > unsubscribe > <https://github.com/notifications/unsubscribe-auth/ACECGJGKK2FYZLF55ITU6ML3NOTVJAVCNFSM6AAAAACD23I4WKVHI2DSMVQWIX3LMV43ASLTON2WKOZTGMYTSOJTGA3TQNY> > . > You are receiving this because you are subscribed to this thread.Message > ID: ***@***.***> >

[alexanderankin]

#862