通过从属性文件动态传递值来创建厨师配方

Question

I created a chef recipe which has the installation of a specific rpm mentioned in it. This rpm has a version number which needs to be loaded dynamically from a properties file (which is itself created dynamically). This chef recipe then needs to be loaded into the chef server.

remote_file "Core_feature.rpm" do
path   "#{src_loc}core_feature_v91-2.noarch.rpm"

Here, v91-2 is the value which needs to go in dynamically into the recipe, by reading from a properties file.

Is this achievable? If yes, how do I go on to implement it.(Have no idea on ruby)!

Answer 1

You have a few options. The best, in my opinion, is to use a json file rather than a properties file. You can then use the -j flag on your chef-client call to read the json file in as normal attributes on your node. The major caveat there is that normal attributes persist from one chef run to the next, so you'd need to be sure they're being re-set with each chef run.

Alternately, you can have jenkins use knife to set the attributes directly on the node. You'll need a plugin knife node attribute set ... . OR you could set it on the environment or role, if those are viable options, but they'll involve pulling the environment or role from the server, modifying it, and then pushing it back up.

Another option is to use ruby to read your properties file as part of your attributes/xxxx.rb file. You could then set the node attributes from it at whatever precedent level you want.

attributes/default.rb

properties = IO.read('/path/to/properties/file')
# parse properties and set node attributes like this
node.default[:something] = <your value>