Use a centralized id solution, such as ldap or kerberos, or a combination of the two. Both MIT and Heimdal kerberos implementations play nicely with OpenSSH.

Use a centralized id solution, such as ldap or kerberos, or a combination of the two. Both MIT and Heimdal kerberos implementations play nicely with OpenSSH. There is also a patch available (somewhere) for OpenSSH to allow one to put their SSH public keys into an LDAP directory.