Cfn-lint file with your stack.yml

cfn-lint file_with_your_stack.yml
E0000 mapping values are not allowed in this context
file_with_your_stack.yml:5:23

cfn-lint RDS_snippets.cf
E1001 Top level template section MyDB is not valid
RDS_snippets.cf:1:1

E1001 Missing top level template section Resources
RDS_snippets.cf:1:1

E1012 Ref MyDbSecurityByEC2SecurityGroup not found as a resource or parameter
RDS_snippets.cf:5:7

E1012 Ref MyDbSecurityByCIDRIPGroup not found as a resource or parameter
RDS_snippets.cf:6:7

See also

• cfn-lint, cfn-lint --help
• AWS CloudFormation, AWS::CloudFormation AWS CloudFormation Designer, Drift detection, AWS Cloud Development Kit (CDK), aws cloudformation, ServicesStack:, AWS CloudFormation Linter (cfn-lint), Former2, CloudCraft, Change sets, AWS CloudFormation Public Registry, CloudFormation snippets, CloudFormation templates, StackSets, Outputs:, Type:, Fn::Sub, !Ref, CloudFormation Parameters, AWS CloudFormation Templates, CloudFormation functions