There are many posts out there showing the process to modify the /etc/fstab file to include mounting a CIFS share to a Windows based system.  The base Ubuntu Wiki does a great job, however this post is a quick tip for the .smbcredentials file to pass along the domain name to my Openfiler shares.

The Ubuntu credentials section does reference a domain, however I ended up having issues when connecting to my Openfiler system using the username@domain syntax.  The Openfiler system itself contains shares that use Active Directory group based authentication from a Domain Controller.  Adding the “domain” line to the .smbcredentials file worked for the specific situation.  Below is the example file. Note that the @domain syntax is not required with the additional domain parameter.

username=notreal
password=notrealpw
domain=domain.local