Problem: Validation failed during selection of education server

Problem:

During the join of a news educativ slave a validation error occurs during join.

Investigation:

In the logfile you can find something like this:

2021-01-13 12:11:09,585 ucsschool-join-hook: [INFO] Host is member of following groups: [‘cn=DC Slave Hosts,cn=groups,dc=schein,dc=me’]
2021-01-13 12:11:09,586 ucsschool-join-hook: [INFO] Determined role packages: [‘ucs-school-central-slave’]

So here it is clear, that the slave is not recognized as a edu slave. What was missing was the role.
During join, based on the groups and the role, it is examined what kind of slave is joined.

Solution:

Append groups and role to the slave

udm computers/domaincontroller_slave modify --dn cn=slave-sun,cn=dc,cn=server,cn=computers,ou=sun,dc=schein,dc=me --append groups=cn=DC-Edukativnetz,cn=ucsschool,cn=groups,dc=schein,dc=me --append groups=cn=OUSUN-DC-Edukativnetz,cn=ucsschool,cn=groups,dc=schein,dc=me
--append ucsschoolRole=dc_slave_edu:school:SUN