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Listing off registered services (nova-scheduler, nova-compute and so on) and their current state. The updated_at field is used to determine if a given service is considered healthy or not.

“services” is a database table. If you don’t known what a database table is, think of it as a listing.

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My guess was: listing somewhere other than the registered services. – GEdgar Apr 2 at 1:28
up vote 4 down vote accepted

list someone or something off:

to recite a list of people or things, one by one.

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It's still quite common that someone in the IT department will list off some selected details as a one-off paper report, so a front-office worker can trawl through the items sorting something out. – FumbleFingers Nov 24 '11 at 17:16
I can attest to this being correct, too. It's commonly used in the UK. – Polynomial Nov 24 '11 at 17:17

It means that the writer misspelled “of” as “off”.

It’s not relevant that the phrase “listing off” is also in circulation. The OP quotes from a technical manual, the O’Reilly nutshell handbook Deploying OpenStack. The extract is a field definition for the database field “services”. Between a field name and its definition is an implicit “is” or “contains“. Try reading the extract as

services contains a listing off registered services


services contains a listing of registered services

If the OP is still in doubt of what was intended I suggest contacting the author.

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No it doesn't. I can list off numerous examples where 'off' is exactly what was meant. – FumbleFingers Nov 24 '11 at 17:10
@FumbleFingers — I think it's clear from the context of the question that the phrase should be listing of. The description is not describing an action, it is describing a noun. – Matt E. Эллен Nov 25 '11 at 20:30
It is extracted from Deploying OpenStack exactlty. BTW, What 'OP' stands for? – Liu Nov 26 '11 at 11:53
OP means Original Poster -- the person who posted the question. – MετάEd Nov 26 '11 at 15:25
I don't have the rest of the handbook, which might make things clearer, but from what OP has quoted, it seems equally possible the "heading" services could simply be followed by a list of actions. But it makes no difference to the meaning either way, and that's what was asked for. – FumbleFingers Nov 26 '11 at 16:53

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