Information Technology Reference
In-Depth Information
Add an attribute specifying the download URL for the Chef Server package that you ob-
tained from
http://www.getchef.com/chef/install
.
We recommend using the 11.1.4 version
URL shown in
Example A-2
, as we wrote the examples for this chapter using this version.
Example A-2. /chefdk/chef-repo/cookbooks/chef-server/attributes/default.rb
default
[
'
chef
-
server
'
][
'
url
'
] =
\
'
https
:
//o
pscode
-
omnibus
-
packages
.
s3
.
amazonaws
.
com
/
el
/
6
/
x86_64
'
\
'
/
chef
-
server
-
11
.
1
.
4
-
1
.
el6
.
x86_64
.
rpm
'
Let's take an initial stab at coding a recipe to replicate the manual steps required to install
Chef Server outlined in
How to Install Open Source Chef Server Manually
.
Enter in the first
version of the code as shown in
Example A-3
. Let's go over some of the highlights of the
code in the following paragraphs.
Rather than typing in long variable names such as
node['chef-server']['url']
, feel free
to use temporary local variables in a recipe with shorter names, such as:
package_url
=
node
[
'chef-server'
][
'url'
]
Remember that you have the full power of Ruby classes and methods available to you in
your Chef recipes, so don't be afraid to use it. For example, you can use the
::File.basename()
method to extract the package name from the URL. The package name
is the last component of the URL after the forward slash (“/”):
chef-serv-
er-11.1.4-1.el6.x86_64.rpm
. Refer to the
Ruby core API documentation
for more in-
formation on the
::File
class:
package_name
= ::
File
.
basename
(
package_url
)
Unfortunately, the
package
resource does not work with URLs, so we're introducing a new
resource, the
remote_file
resource. The
remote_file
resource will download files from a
remote location. Rather than hardcoding a path like “/tmp” for the package download, Chef
provides a variable you should use instead:
Chef::Config[:file_cache_path]
. Let Chef
choose the best place to store temporary files for you. Pass the local path where you want to
store the file as a string parameter to
remote_file
or as a
name
attribute; in this case, we use
the
package_local_path
variable. The download URL should be passed to
remote_file
as
the
source
attribute.
