This is a Keycloak extension to automatically increment the POSIX account UID number (LDAP attribute uidNumber) when newly creating LDAP users. Also sets homeDirectory to /home/username.

Run the maven package command:

mvn compile
mvn package

Next, copy the jar file from the target directory to the /opt/keycloak/providers/ directory and restart Keycloak. You can then add a mapper in the LDAP user federation of the type keycloak-ldap-posixaccount and configure the first UID to use for new users.