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I'd probably run a separate container in the Task instead of using pulumi.

So I currently deploy the infra on Fargate with Pulumi. So If I create another task definition for db migration, how can I ensure that the container exits after the migration is applied? Do you have any guide that you can point me to?

you do not need another task definition, just container with

dependsOn

, read up on ECS docs https://docs.aws.amazon.com/AmazonECS/latest/developerguide/welcome-features.html https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html#other_container_definition_params

Thanks I'll go through the resources 👍

Fargate assumes that containers in a task definition are essential and therefore need to be restarted when they exit regardless of exit code. Set the

essential

property to

false

for your migration container to prevent it from being restarted. However, I think if your migration container exits on failure it won't stop the other container from starting up, assuming you want that sort of control. You might need to achieve that through some other means by detecting that the migration container exited with failure status code and handle that however that's appropriate to you.

Thanks @clever-sunset-76585 for the insight. I'll try it out. In general is it better to may be write a Lambda function to take care of this db migration or is running db migration within Fargate a good practice?

Running it using Lambda may complicate your architecture. It depends on your setup, though. You could spin up the Lambda inside your VPC such that it can access your DB, assuming your DB is only accessible within your VPC. But you can do that with a task definition too. Basically, run a task definition that only has your migrations container with

essential

set to false and detect if the container exited with a failure status code. You'd have do that detection no matter which service you choose -- Lambda or Fargate. As for which is better, it's hard to say. It depends on a few factors. Each has its benefits of being "better" than the other. Choose what makes sense to you and what you need right now.

yeah...that makes sense... thanks @clever-sunset-76585

I have a blog post on how to do this https://medium.com/pixel-and-ink/running-database-migrations-in-aws-fargate-with-pulumi-eba56a7bf5e4