A tag is a custom description that is applied to a node. A tag, once
applied, can be helpful when managing nodes using knife or when building
recipes by providing alternate methods of grouping similar types of
information.
Tags can be added and removed. Machines can be checked to see if they already have a specific tag. To use tags in your recipe simply add the following:
tag('mytag')
To test if a machine is tagged, add the following:
tagged?('mytag')
to return true or false. tagged? can also use an array as an
argument.
To remove a tag:
untag('mytag')
For example:
tag('machine')
if tagged?('machine')
Chef::Log.info("Hey I'm #{node['tags']}")
end
untag('machine')
unless tagged?('machine')
Chef::Log.info('I am not tagged')
end
Will return something like this:
[Thu, 22 Jul 2010 18:01:45 +0000] INFO: Hey I'm machine
[Thu, 22 Jul 2010 18:01:45 +0000] INFO: I has no tagz