If you will be upgrading from PMDF V5.0, then prior to upgrading PMDF you should change the PMDF user account name, as discussed below in Section 1.3.1 . Sites upgrading from PMDF V5.1 or later may proceed directly to upgrading.
1.3.1 Change PMDF user account name
If you are upgrading from PMDF V5.0, note that as of PMDF V5.1 the name
of the PMDF user account (an unprivileged account used for performing
some specialized tasks) is pmdfuser rather than
pmdf_user, as previously. (The old pmdf_user
name, being greater than eight characters in length, was problematic on
UNIX systems.) This PMDF user account name is relevant for sites using
PMDF sequence number files, for instance.
So if you have an old PMDF user account with the old name
pmdf_user, you should change it to use the new name,
pmdfuser.
Or if you do not wish to change the account name at this time, you may
set the PMDF_USER_USERNAME option in the PMDF tailor file,
/etc/pmdf_tailor, to point at the old PMDF user account
name, e.g.,
PMDF_USER_USERNAME=pmdf_userNote that you will need to reimplement this change (or actually change the account name) each time you upgrade PMDF since your PMDF tailor file will be overwritten at such time.