@recyclop Can you perhaps upload some screenshots of your SAML configuration and your login pages, with any sensitive information blocked out? It’s a little hard for me to understand what problem you’re having.
I can have however the two buttons showing on the same site
which two buttons? Do you have two SAML identity providers?
Each site has its own edxapp database and its own domain name for each lms docker container.
If that’s the case, it’s hard to imagine how they could be interfering with each other. They should be completely separate.
Any advice on how to run several edX sites on the same server ? Or maybe can someone share his experience on how to run two edX sites on the same server ?
First, you’re talking about development and testing only right? devstack is not meant for production use.
If so, check out Developing on Open edX named release branches — Open edX Devstack Unversioned documentation and Multiple isolated devstacks on the same host - #6 by Zachary_Trabookis
By the way, you can also use the platform’s “Sites” framework to have just one single LMS container running (with one edxapp database) but which can be accessed at two different URLs, with each URL having different name/appearance, different courses, and different SAML providers (but user accounts are shared between them). Just mentioning that in case it’s a simpler option.