Information Technology Reference
In-Depth Information
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Introducing the Cookbook_file Resource
We'll use Chef to help us more easily determine that we are running on a guest virtual ma-
chine node by writing some automation to change the Linux
message of the day
. On Linux,
the
message of the day
is displayed when a user logs in. The
message of the day
is used by
Linux administrators to communicate with users. You can change the
message of the day
by
editing the file
/etc/motd
. When a user successfully logs in, the contents of the
/etc/motd
file
will be displayed as the message of the day.
knife cookbook create
generates a
recipes/default.rb
file for you. By convention, this is
the default location for your Chef code. All recipe
.rb
files containing Chef code are expec-
ted to be in the
recipes/
subdirectory of a cookbook.
#
# Cookbook Name:: motd
# Recipe:: default
#
# Copyright 2014, YOUR_COMPANY_NAME
#
# All rights reserved - Do Not Redistribute
#
Add some Chef code to change the
/etc/motd
on your node by editing
recipes/default.rb
to
resemble
Example 7-6
(we'll leave it as an exercise to the reader to modify the copyright and
licensing text in the comments later).
Example 7-6. knife/motd/recipes/default.rb
#
# Cookbook Name:: motd
# Recipe:: default
#
# Copyright 2014, YOUR_COMPANY_NAME
