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Net::HTTPServerException: 412 "Precondition Failed"

Feb. 5, 2012, 2:15 p.m.

chef

So, I've been working with Chef quite a bit, lately. Every once in a while, I'll bootstrap a new node and it fails with this:

Net::HTTPServerException: 412 "Precondition Failed"

Every single time this has happened to me, I've had stop and scratch my head. Why can't I remember what causes this!? Well, in my case it's usually a misspelled cookbook or recipe name. For example, I might have a role that looks something like this:

name "sample-server"
description "sample apache server"
run_list "role[apache::default]"

Can you spot the problem? The opscode cookbook for apache is named apache2!

name "sample-server"
description "sample apache server"
run_list "role[apache2::default]"

So, one complaint that I have about chef is that Net::HTTPServerException: 412 "Precondition Failed" should probably say something like Net::HTTPServerException: 412 "Couldn't find cookbook 'apache'". Oh well... C'est la vie

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