The current selinux policy prevents krb5kdc_t access to disrv_var_run_t to write to sock_file.

Dan suggested adding the following to the policy:

optional_policy(`
 ldap_stream_connect(krb5kdc_t)
')
optional_policy(`
 dirsrv_stream_connect(krb5kdc_t)
')


I locally fixed it by creating a local policy with the following 2 allows:
allow krb5kdc_t dirsrv_var_run_t:sock_file write;
allow krb5kdc_t dirsrv_t:unix_stream_socket connectto;

HTH