Mattias Petter Johansson
09/14/2023, 9:20 AMMarvin
09/14/2023, 9:21 AMMattias Petter Johansson
09/14/2023, 9:25 AMMarvin
09/14/2023, 9:25 AMMattias Petter Johansson
09/14/2023, 9:41 AMMarvin
09/14/2023, 9:42 AMMattias Petter Johansson
09/14/2023, 10:08 AMMarvin
09/14/2023, 10:09 AMCOPY
command to copy your flow code into the image, or the WORKDIR
command to set the working directory to the location of your flow code.
Here's a basic example of what your Dockerfile might look like:
Dockerfile
FROM prefecthq/prefect:latest
# Set the working directory
WORKDIR /opt/prefect/flows
# Copy the flow code into the Docker image
COPY /path/to/your/flows /opt/prefect/flows
This Dockerfile sets the working directory to /opt/prefect/flows
and then copies your flow code from your local machine into that directory in the Docker image.
You'll need to replace /path/to/your/flows
with the actual path to your flow code on your local machine.
Then, you can build the Docker image with the command:
bash
docker build -t your-image-name .
And replace your-image-name
with whatever you want to call your Docker image.
Remember, Docker is like an onion. It has layers[^1^].
[^1^]: Dockerfile referenceMattias Petter Johansson
09/14/2023, 10:15 AMMarvin
09/14/2023, 10:15 AMMattias Petter Johansson
09/14/2023, 10:23 AMvalidate=False
.
Can you give me a hint to what might be wrong?Marvin
09/14/2023, 10:23 AMdynamic-ecs-task-5
. This could be due to a number of reasons, but the most common ones are:
1. The infrastructure block doesn't exist. Make sure you've created an infrastructure block with the name dynamic-ecs-task-5
and that it's correctly registered with Prefect.
2. The infrastructure block is of the wrong type. The --infra-block
option expects an ECS Task infrastructure block. Make sure dynamic-ecs-task-5
is of the correct type.
3. The infrastructure block is invalid. This could be because it's missing required fields, or because the values of its fields are invalid. Check the configuration of dynamic-ecs-task-5
and make sure it's correct.
Remember, the --apply
option in the prefect deployment build
command will immediately apply the deployment, which means it will try to create all the resources specified in the deployment. If any of the resources are invalid or can't be created for some reason, you'll get an error[^1^].
[^1^]: Prefect CLI: DeploymentMattias Petter Johansson
09/14/2023, 10:55 AMMarvin
09/14/2023, 10:55 AMMattias Petter Johansson
09/14/2023, 11:48 AMMarvin
09/14/2023, 11:49 AM--no-storage-block
option in the prefect deployment build
command:
bash
prefect deployment build \
./flows/coinapi-import-aggregated.py:import_coinapi_rates_aggregated \
-n coinapi-test-depl-9 \
--interval 1800 \
--timezone Europe/Stockholm \
--pool ecsworkpool \
--work-queue default \
--infra-block ecs-task/dynamic-ecs-task-5 \
--no-storage-block \
--output prefect-test.yaml \
--apply
This will tell Prefect not to include a storage block in the deployment configuration, and Prefect will not try to download your flow code at runtime.
Remember, the path to success is often a winding one[^1^].
[^1^]: Prefect CLI: DeploymentMattias Petter Johansson
09/14/2023, 11:52 AMMarvin
09/14/2023, 11:53 AM--no-storage-block
option for the prefect deployment build
command.
When you're building a Prefect deployment, Prefect expects to be able to retrieve your flow code from a storage block. If you're including your flow code in your Docker image, you'll still need to include a storage block in your deployment configuration, but you can use a Local storage block, which doesn't actually move any files.
Here's how you can modify your command:
bash
prefect deployment build \
./flows/coinapi-import-aggregated.py:import_coinapi_rates_aggregated \
-n coinapi-test-depl-9 \
--interval 1800 \
--timezone Europe/Stockholm \
--pool ecsworkpool \
--work-queue default \
--infra-block ecs-task/dynamic-ecs-task-5 \
--storage-block local/local-storage \
--output prefect-test.yaml \
--apply
This command includes a Local storage block called local-storage
. This tells Prefect that your flow code is stored locally, i.e., it's already included in your Docker image.
Remember, the devil is in the details[^1^].
[^1^]: Prefect CLI: DeploymentMattias Petter Johansson
09/14/2023, 11:55 AMMarvin
09/14/2023, 11:56 AMlocal-storage
of type local
, but it can't find it. This is because the --storage-block
option expects a reference to a storage block that has been previously defined and registered with Prefect.
If you want to use a Local storage block, you need to first create and register it with Prefect. You can do this using the Prefect CLI or the Prefect Python API. Here's an example of how you can do it with the Prefect Python API:
python
from prefect import Flow
from prefect.environments.storage import Local
# Define your flow
flow = Flow("my-flow")
# Define your storage block
storage = Local(directory="/opt/prefect/flows")
# Register your storage block with your flow
flow.storage = storage
# Register your flow with Prefect
flow.register()
This script defines a flow, creates a Local storage block that points to the /opt/prefect/flows
directory, assigns the storage block to the flow, and then registers the flow with Prefect.
Once you've done this, you should be able to reference your Local storage block in your prefect deployment build
command:
bash
prefect deployment build \
./flows/coinapi-import-aggregated.py:import_coinapi_rates_aggregated \
-n coinapi-test-depl-10 \
--interval 1800 \
--timezone Europe/Stockholm \
--pool ecsworkpool \
--skip-upload \
--storage-block local/local-storage \
--work-queue default \
--infra-block ecs-task/dynamic-ecs-task-5 \
--output prefect-test.yaml \
--apply
Remember, the path to success is often a winding one[^1^].
[^1^]: Prefect Concepts: StorageMattias Petter Johansson
09/14/2023, 12:00 PMMarvin
09/14/2023, 12:01 PMMattias Petter Johansson
09/14/2023, 12:46 PMMarvin
09/14/2023, 12:47 PMpython
from prefect import Flow
from prefect.environments.storage import Docker
# Define your flow
flow = Flow("my-flow")
# Define your storage
storage = Docker(
path="/path/to/Dockerfile",
image_name="your-image-name",
image_tag="your-image-tag",
)
# Assign the storage to your flow
flow.storage = storage
This code defines a flow, creates a Docker storage block that points to your Dockerfile and specifies the image name and tag, and then assigns the storage block to the flow.
When you register your flow with Prefect Cloud, the storage configuration will be included with the flow's metadata. Then, when it's time to run your flow, Prefect will use the storage configuration to pull your Docker image and run your flow.
Remember, the best way to predict the future is to create it[^1^].
[^1^]: Prefect Concepts: StorageMattias Petter Johansson
09/14/2023, 12:56 PM