How to set Environment Variables on EC2 instance via User Data

Question

I am trying to set environment variables with EC2s user data, but nothing i do seems to work

here are the User data scripts i tried

#!/b         


        

Answer 1

From this Medium.com article, you can put a script in UserData that writes to a file in /etc/profile.d that will get run automatically when a new shell is run.

Here is an example cloudformation.yaml

Parameters:
  SomeOtherResourceData:
    default: Fn::ImportValue: !Sub "SomeExportName"
Resources:
  WebApi:
    Type: AWS::EC2::Instance
    Properties:
      # ...
      UserData:
        Fn::Base64: !Sub
          - |
            #!/bin/bash

            cat > /etc/profile.d/load_env.sh << 'EOF'

            export ACCOUNT_ID=${AWS::AccountId}
            export REGION=${AWS::Region}
            export SOME_OTHER_RESOURCE_DATA=${SomeOtherResourceData}

            EOF
            chmod a+x /etc/profile.d/load_env.sh

And a YAML that exports something

# ...
Outputs:
  SomeExportName:
    Value: !Sub "${WebDb.Endpoint.Address}"
    Export:
      Name: SomeExportName