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Hello All, I am trying to run Prefect on Docker, a...
# ask-community
n
Hello All, I am trying to run Prefect on Docker, and I am getting the following error : docker: Error response from daemon: OCI runtime create failed: container_linux.go349 starting container process caused "exec: \"-p\": executable file not found in $PATH": unknown. , Can someone help please
👀 1
d
Hi @Nazeer Hussain! Can you tell me a little bit more about the steps you took that lead up to this error including: 1. Are you trying to spin up Prefect Server 2. Are you attempting to run a flow? 3. Is 
prefect
available in your path?
n
Hi Dylan
I have just pulled the Prefect image from Dockerhub : https://hub.docker.com/r/prefecthq/prefect
and trying to run it first, am i missing something, please help
Yes, You are right, first I need to run a Prefect server in Docker
I want to run a prefect flow using the Docker , unable to find the right documentation
d
First, let’s make sure you have Docker Compose installed
n
docker-compose version 1.25.5, build 8a1c60f6
d
Here’s the relevant doc
prefect backend server
prefect server start
n
ok Should I install prefect manually first , as described in https://docs.prefect.io/core/getting_started/installation.html
d
Can you run 
prefect version
for me?
n
let me check
d
And yes, you’ll need to install Prefect into your current python environment
n
-bash: prefect: command not found
d
Okay! Looks like 
prefect
isn’t available in your $PATH
How are you managing your python dependencies?
pip
conda
etc
n
ok one moment plz, installation in progress
prefect version 0.11.5
done
d
👍
Now try: 
prefect backend server
prefect server start
n
Sure, Thanks for helping, let me try that
prefect backend server Backend switched to server
d
Of course! That’s what we’re here for 😄
n
🙂
My end goal is to run Prefect on AWS ECS
so wanted to try the docker way first
You are awesome @Dylan
upvote 1
d
Anytime!
😄
n
how can i run a sample flow plz
d
Should be a great place to start!
n
let me check
OK i create the test.py using the code :
Copy code
import prefect
from prefect import task, Flow

@task
def hello_task():
    logger = prefect.context.get("logger")
    <http://logger.info|logger.info>("Hello, Cloud!")

flow = Flow("hello-flow", tasks=[hello_task])
how do i run it please
d
Make sure you follow all the steps in https://docs.prefect.io/orchestration/tutorial/first.html
Including registering the Flow with your Prefect Server backend
n
ok let me check again
d
But after that, you’ll be able to run the flow in a few ways outlined in the bottom of the doc
But the simplest should be by navigating to the Flow’s page in the Prefect Server UI and pressing the 
Run
button
n
Still not clear how to register a flow
😞
d
You’ll need to run the flow you registered in a python interpreter like 
ipython
and then call 
.register()
on the 
flow
object
What I typically do is: 1. write my flow 2. load the python file with 
ipython -i flow.py
n
ok let me try
ok..
d
3. run the flow with 
flow.run()
and if that works 4. Register my flow with 
flow.register()
all in the same ipython session
Prefect is designed so that you can run your flow on your laptop using only python
for testing / experimenting
n
ok.. installing ipython using brew
d
Then when you’re ready, you register the flow with Cloud/Server and schedule it to run using a schedule or by pressing the 
Run
button in the UI
n
ok.. i will try
but i was unable to deploy the Prefect on AWS ECS.. do you have any reference link please
My task is to deploy it on the cloud using ECS< the dev team needs to use it for setup
ipython -i test.py  Python 3.8.3 (default, May 27 2020, 205350)  Type 'copyright', 'credits' or 'license' for more information IPython 7.15.0 -- An enhanced Interactive Python. Type '?' for help. --------------------------------------------------------------------------- ModuleNotFoundError            Traceback (most recent call last) ~/prefect/test.py in <module> ----> 1 import prefect    2 from prefect import task, Flow    3     4 @task    5 def hello_task(): ModuleNotFoundError: No module named 'prefect'
d
Hi Nazeer, we don’t have a doc specifically for ECS
n
oh ok
d
Here’s a blog post you can use as a guideline even though it’s GCP: https://medium.com/the-prefect-blog/prefect-server-101-deploying-to-google-cloud-platform-47354b16afe2
👍 1
If you need to do some quick experimentation with Prefect before you dive in to creating new infrastructure, Prefect Cloud has a free tier
n
I will check it out
d
To sign up, head to https://cloud.prefect.io
n
Sure will check Prefect cloud as well
d
thanks to Cloud’s Hybrid Model, we never see any of your flow code or data
That all stays on your infrastructure
n
ok
Sounds Great
ipython -i test.py  Python 3.8.3 (default, May 27 2020, 205350)  Type 'copyright', 'credits' or 'license' for more information IPython 7.15.0 -- An enhanced Interactive Python. Type '?' for help. --------------------------------------------------------------------------- ModuleNotFoundError            Traceback (most recent call last) ~/prefect/test.py in <module> ----> 1 import prefect    2 from prefect import task, Flow    3     4 @task    5 def hello_task(): ModuleNotFoundError: No module named 'prefect'
what could be wrong
my prefect server is running
d
Python dependency management is tricky
Are you using pip or conda?
n
pip3
d
Since you installed 
ipython
with homebrew, it may not exist in the same python environment as 
pip3
try 
brew uninstall ipython
pip3 install ipython
n
ok let me do that
d
And I’d recommend checking out Anaconda or pipenv to create separate python environments
n
OK, thank you
d
(personally I use anaconda since it also works for non-python dependencies like C libraries and whatnot)
n
I am not a python Expert, but an Architect, will still give it a try 🙂
Thanks Dylan
it finally worked
d
🎉
👍 1
Awesome!
👍 1
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