Host entry on Batch

Question

I have a process which have to do a SOAP request to an url, but this URL doesn't exists, so I have to mock it using the /etc/hosts file. I'm using an ubuntu docker image, but it seems that AWS Batch overwrites the /etc/hosts file. I'm using the same image on AWS Lambda, and there the /etc/hosts file is preserverd and works fine. Is there a way to change that file on AWS Batch to make those requests?

Thank you!

Answer

Hi!

Thank you for the response, but I forgot to mention we are using Fargate and it seems that Launch Template are not supported by Fargate.

Answer

Hello,

You can try using the Launch template support for AWS Batch for this requirement.
Using launch template you can add custom userdata which will add a particular entry to /etc/hosts file on instance launch.

```
#!/bin/bash
echo "1.1.1.1    myexampledomain.com" >> /etc/hosts
```

Reference documentation: https://docs.aws.amazon.com/batch/latest/userguide/launch-templates.html

Host entry on Batch

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