@Marvin getting this error:

Flow run could not be submitted to infrastructure: Failed to run ECS task, cluster 'arn:aws:ecs:eu-central-1:*******:cluster/windows' does not appear to have any container instances associated with it. Confirm that you have EC2 container instances available.

while trying to run a flow deployed with push work pool, on a windows container, using ec2 backed ecs cluster. the cluster has already registered with an auto scaling group, but not sure why can’t launch the EC2 isntance?!

The error message essentially indicates that there are no EC2 container instances available in your specified ECS cluster. This is a common issue often related to misconfiguration or the EC2 instances not being properly set up or entered into the ECS cluster. Here are the key points and steps from the Prefect documentation and relevant GitHub issues that might help: ### Steps to Resolve 1. Check EC2 Instance Status: Make sure that the EC2 instances are running and have been successfully added to the cluster. You can verify this by checking the ECS instances attached to your cluster in the AWS Management Console. 2. Ensure Proper Auto Scaling Group Configuration: Confirm that the auto-scaling group is correctly configured and that it has launched instances that are registered with the ECS cluster. Sometimes there might be a delay or an issue preventing instances from registering. 3. IAM Roles and Policies: Ensure that the EC2 instances have the correct IAM role attached, which allows them to register themselves with the ECS cluster. Necessary permissions include

ecs:JoinCluster

. 4. Bootstrap Script: Make sure that the EC2 instances are using a bootstrap script that registers the instance with the ECS cluster. Typically, this script is specified through the EC2 user data when launching the instances. ### Example Bootstrapping EC2 Instance for ECS When you launch an EC2 instance, you might need to include a user data script that makes sure the instance registers itself with your ECS cluster. An example user data script might look like this:

bash
#!/bin/bash
echo ECS_CLUSTER=your_cluster_name >> /etc/ecs/ecs.config

### Documentation Links: 1. Prefect AWS ECS Integration 2. Prefect AWS ECS Guide ### Relevant GitHub Issues: - Add ability to provision resources with user provided names in ECS push pool provisioner Please verify the above steps in your AWS environment. If the problem persists, ensure that all necessary configurations for both ECS and EC2 instances are in place as specified in the documentation. I know, it’s just more dreary setup work, but it has to be done. If only these things were as efficient as a depressed robot...

@Marvin does prefect support push work pool on ecs based on EC2 ( not fargate?)

Yes, Prefect does support push work pools on ECS based on EC2, not just Fargate. Although the setup for EC2-based ECS clusters can be more complex compared to Fargate, it’s certainly feasible. ### Key Points 1. EC2-based ECS Clusters: - Prefect’s ECS work pools can be configured to utilize EC2 instances. - EC2 can reduce setup time compared to configuring each flow run with Fargate, particularly in large, steady-state environments. 2. Infrastructure Requirements: - When setting up an ECS cluster for Prefect, you need to ensure that you have the correct infrastructure, such as IAM roles, VPC, subnets, and security groups configured appropriately. - This snippet from the Prefect documentation highlights the need for creating resources like IAM users, policies, ECS clusters (which can use EC2), VPC, etc. ### Documentation Links: - Prefect Push Work Pools Guide - Prefect AWS ECS Guide ### Example Command: To create an ECS work pool using the Prefect CLI, you can use:

bash
prefect work-pool create --type ecs my-ecs-pool

and then configure the work pool to use your ECS cluster that runs on EC2 instances. ### Additional Steps: 1. Create an ECS Cluster: Ensure that your ECS cluster uses EC2 instances. Configure the necessary instance types, auto-scaling groups, and bootstrap scripts. 2. Configure the Work Pool: Use the Prefect UI or CLI to configure the work pool to use the created ECS cluster. Make sure the cluster, subnets, and security groups are correctly assigned. Wouldn’t it be nice if things just worked without all this fuss? Oh well, at least you know it’s possible. Good luck with your configuration!