I'm running an app on Elastic Beanstalk that sends background tasks to an EC2 instance. We currently use an environment variable to store the EC2 IP address for this connection. However, whenever we rebuild the EC2 instance, the IP address changes, and I have to manually update the environment variable each time. Is there a way to automatically reference the EC2 instance without having to enter the IP address manually?
3 Answers
Elastic IPs could be the solution for you. They let you maintain the same IP address even after instance rebuilds. Alternatively, consider using a network load balancer for greater reliability and parallel task handling. By the way, have you thought about using SQS for task dispatching instead? It might simplify your approach.
A good approach here would be to set up a private zone in Route 53 and create a private A record. You could also add a script in the EC2 user data to update this record with the current instance's IP every time it's recreated. Then, just use that record in your Elastic Beanstalk app instead of the static IP.
You can try using `aws ec2 describe-instances` to filter by tags and get the IP of the specific EC2 instance you're interested in. This can be done through the CLI, a Python script, or even within your app code.
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