The glue-validator command is a very useful command for system administrators and middleware developers who want to validate whether the information published by the service they are managing or developing is compliant with Glue 2.0. In particular, the glue-validator is able to validate against the EGI profile for GLUE 2.0 This training will present the glue-validator and how to validate the information published by a site or a resource against the EGI profile for GLUE 2.0. It will describe in detail the different command line options and possible output formats. The training will also explain how to deal with the different failure messages from a practical point of view. An overview of the deployment of GLUE 2 validation in production will be also introduced, explaining what type of errors will raise alarms for the sites and how support to sites will be given by ROD. Finally, some details on the current status of GLUE 2 will be presented, highlighting the most common errors and what to do to get rid of them.