Ohai is the tool used by a Chef client to find out everything about the node's environment. During a Chef client run, Ohai plugin populates the node object with all the information it found about the node such as its operating system, hardware, and so on.
It is possible to write custom Ohai plugins to query additional properties about a node's environment.
Make sure you have
iptables installed on your node. See the Managing firewalls with iptables recipe in Chapter 7, Servers and Cloud Infrastructure.
Make sure you have the
chef-client cookbook available:
chef-clientcookbook to your
mma@laptop:~/chef-repo $ subl Berksfile
chef-clientcookbook to your node's run list: