Hi @Takahito Iwasa Thank you for pointing it, we did worked on last year to help the users running .NET workloads on Linux containers which uses gMSAs for authentication. We did open-source Credentials-fetcher (https://github.com/aws/credentials-fetcher) last year and are open to contributions.
Here is the quick 2 line summary about credentials-fetcher:
Credentials-fetcher is a Linux daemon that retrieves gMSA credentials from Active Directory over LDAP. It creates and refreshes kerberos tickets from gMSA credentials. Kerberos tickets can be used by containers to run apps/services that authenticate using Active Directory.
For anyone who has the similar use-case to run gMSA on Linux containers can follow the instructions provided here - https://github.com/aws/credentials-fetcher/blob/mainline/README.md,