Generate a Base64 Encoded Password

See Generating Base64 Encoded Strings

Update Service Principal Passwords

1. Create LDIF:

   dn: CN=PRINCIPAL_NAME,OU=OU0,DC=DC2,DC=DC1,DC=DC0
   changetype: modify
   replace: unicodePwd
   unicodePwd:: BASE64_ENCODED_PRINCIPAL_PASSWORD
   

2. Apply LDIF:

   ldapmodify -Z -D BIND_USER@REALM -h HOST -p PORT -W -f LDIF.ldif