使用CHEF将配方应用于主机名与regexp匹配的所有服务器

Question

I'm creating a chef recipe to apply a configuration change on all servers whose hostname matches a specific pattern using regexp. However, I'm not sure how to do it.

Example: my hostname looks like this:

• dvabwichf01
• dvcdwichf01

my recipe in default.rb is :

case node['hostname']
when '*ab*'
  template "/tmp/regextest" do
    source "test_ab.erb"
    mode "0644"
  end
else
  template "/tmp/regextest" do
    source "test_cd.erb"
    mode "0644"
  end
end

But this is not working as expected, only the "else" template is updating on all servers. please assist.

Answer 1

You would need to use an actual regex, not a string like you have there (also you're using fnmatch glob matching, not a regex). That would only fix when the hostname is literally *ab* . A regexp literal in Ruby usually looks like /whatever/ . so when /ab/ in this case.

Answer 2

I used switch for choosing values by adding a method in my helper file (in my case I put it into / app / helpers / application_helper.rb Example below: def name_of_your_method(hostname) case hostname when "Host1" "template_1" when "Host2" "template_2" when "Host2" "template_3" when "Host3" "template_4" else "template_default" end end

Then in your code you would use the name in your method:

<%= user.hostname %>

And in your table(data) you would have a column for hostname(in this example)

Hope this helps