refresh container.attrs

Following code runs into a problem:

container = docker.from_env().containers.create(image=...)
container.start()
ip = container.attrs["NetworkSettings"]["Networks"]["bridge"]["IPAddress"]
# ip == "" :(, but I get it.
time.sleep(...)
ip = container.attrs["NetworkSettings"]["Networks"]["bridge"]["IPAddress"]
# ip == "" :(, still ???:-(???

[ah19]

I think this is the same problem that I was about to open an issue for – the documentation for running a container does not mention that Container.attrs is cached (specifically in the detach=True example). The Container.reload method is not mentioned in the documentation (nor is wait by the way), is this an oversight or should it not be called?

my code for running a command in two docker images ended up looking like this:

def run_comparison_cmd(old_image, new_image, command, block=True):
    print("Running command '{}' in containers {}, {}".format(command, old_image, new_image))
    client = docker.from_env()
    old = client.containers.run(old_image, command, detach=True)
    new = client.containers.run(new_image, command, detach=True)

    if block:
        print("Containers started, waiting for them to finish")
        old.wait()
        new.wait()

        #attributes are cached, update them
        old.reload()
        new.reload()

    return old, new

should the wait method on Container be updated to perform a reload before returning?

[ah19]

I have run into a similar problem with myself – try running container.reload()