Hey everyone,
I've built a Flask app that uses a Postgres database and I'm using Docker to containerize it. Everything works perfectly on my local environment, but after deploying to Elastic Beanstalk, I'm facing a 504 gateway timeout error on my domain. The logs show a message `GET / HTTP/1.1 499 ... ELB-HealthChecker/2.0` at the end. My `app.py` has a route set up to return 'Ok', yet I keep encountering this issue. I've ensured that my EC2 and service roles are set up correctly. What could be causing this, or is there something I'm overlooking?
3 Answers
It's been a while since I used Elastic Beanstalk, but one common issue could be with the health check settings. If the load balancer is hitting the health check endpoint and is returning 200 OK, you might want to look into adjusting the grace period for your deployment. The health check might need a little extra time to mark it as healthy, especially if it's looking for multiple successful checks within a specific timeframe. It typically requires three 200 responses within a minute to consider the target healthy.
Also, don't forget about the security group configuration for your load balancer. In the past, I had to open outbound traffic on ports 80 or 443 to fix similar issues. Make sure that outbound traffic is properly configured.
Another thing to check is whether your application is actually listening on port 5000. By default, Elastic Beanstalk forwards requests to your app on that port, so if it's not set up correctly, the health checks will fail. Make sure your Dockerfile and any other configuration files are set to use port 5000.
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