i've created a kubernetes cluster using kops and its config file in S3.
The problem is that i've modified some resources manually (such as ec2 properties).
I would like to know if there is some way to view the changes i've made manually.
Hope you can help me.
Considering that you have used AWS config service for auditing the configurations of your AWS resources, you can view the changes either by AWS Config console or by using AWS CLI.
Please refer Viewing Configuration Details to see the required changes.
Try kubediff from weaveworks.
The way I do this is kops terraform output https://github.com/kubernetes/kops/blob/master/docs/terraform.md (--target=terraform flag). Then
terraform plan. This will show the diff between current and config. Either hit apply to revert manual changes, or code manual changes and re-apply.