unable to stream container logs

Using the following code, I’ve been unable to stream logs without the generator blocking infinitely:

import docker

base_url = 'unix://var/run/docker.sock'
client = docker.Client(base_url=base_url,
                       version='1.14',
                       timeout=10)

command = 'echo hello world'
container = client.create_container('ubuntu:14.04', command=command)

client.start(container)
log_stream = client.logs(container, stream=True)

for line in log_stream:
    print(line)

but waiting for the container to complete and reading the logs without streaming works just fine. Am I consuming the output incorrectly, or is there another issue here?

I’m currently using Docker 1.2.0 on Arch, with Python 3.4.1.

[lnxpy]

Hey @kvchen, I found a way to fix this problem. In spite I’m creating a Django container, you just need to create a loop in the streaming process and print the log line like this:

print('Running the container..')
container = client.containers.run('something', detach=True)
process = container.logs(stream=True, follow=True)
print('Stream logging the container..')
for line in process:
    print(line)

It creates a streaming loop in order to print each request that comes to the container. The output goes to be:

$ python test.py
Running the container..
Stream logging the container..

Then, create some requests to the endpoint and it shows…

$ python test.py
Running the container..
Stream logging the container..
b'Watching for file changes with StatReloader\n'
b"Invalid HTTP_HOST header: '172.17.0.3:8000'. You may need to add '172.17.0.3' to ALLOWED_HOSTS.\n"
b'Bad Request: /\n'
b'[16/Sep/2020 10:27:26] "GET / HTTP/1.1" 400 58366\n'
b"Invalid HTTP_HOST header: '172.17.0.3:8000'. You may need to add '172.17.0.3' to ALLOWED_HOSTS.\n"
b'Bad Request: /favicon.ico\n'
b'[16/Sep/2020 10:27:26] "GET /favicon.ico HTTP/1.1" 400 58286\n'

Hope it works for you. It works properly on my project DBMQ.

[leej3]

I ran up against this. I wonder is it the stream kwarg of run that is confusing people (it confused me). I would expect the following to be a non-blocking call and return a generator:

client.containers.run(
        'alpine',
        "/bin/sh -c 'echo hello;sleep 10; echo bye bye'",
        detach=False,
        stream=True,
        )

What I wanted was actually:

 container = client.containers.run(
    'alpine',
    "/bin/sh -c 'echo hello;sleep 10; echo bye bye'",
    detach=True,
    )
for line in container.logs(stream=True):
    print(line.decode("utf-8"))