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1.Provisioning 2 tasks instead of 1: This could be due to several reasons. Firstly, ensure that your service's desired count is set to 1. This parameter dictates how many tasks ECS should run. If it's set to 1 and you're still seeing 2 tasks, it could be due to a misconfiguration or an issue with the task definition. Double-check your task definition to ensure it's correctly specifying one container instance. Also, check if you have any scaling policies or rules in place that might be affecting the number of tasks.
2.Two container instances registered, one active and one draining: This behavior suggests that ECS is replacing the container instances, which could be due to scaling policies, instance health issues, or updates to the ECS cluster. The active instance is handling traffic, while the one in draining state is being removed from the cluster. Check your Auto Scaling Group (ASG) settings, instance health checks, and ECS cluster events for any clues.
3.CloudFormation stack failure despite one task running: The failure could be due to various reasons, such as resource constraints, conflicting configurations, or errors in the CloudFormation template. Check the CloudFormation stack events and logs for more details on why the stack creation failed. It's possible that the failure occurred during resource creation or updating the service.
Here are some steps you can take to troubleshoot these issues:
1.Review your ECS service configuration, including task definition, service settings (desired count, deployment configuration), and networking setup.
2.Check your Auto Scaling Group (ASG) configuration, instance health checks, and scaling policies to ensure they align with your desired ECS setup.
3.Examine ECS cluster events, CloudFormation stack events, and container instance logs for any error messages or warnings that might provide insights into the issues.
4.Consider reaching out to AWS support for assistance if you're unable to resolve the issues on your own.
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