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add knife node show and shef examples

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jtimberman committed Feb 7, 2012
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@@ -7,6 +7,7 @@ Section Objectives:
* Original location of node attributes
* Node's run list
* Methods available in recipes
* Use `knife` and `shef` to examine nodes
.notes These course materials are Copyright © 2010-2012 Opscode, Inc. All rights reserved.
This work is licensed under a Creative Commons Attribution Share Alike 3.0 United States License. To view a copy of this license, visit; or send a letter to Creative Commons, 171 2nd Street, Suite 300, San Francisco, California, 94105, USA.
@@ -342,13 +343,106 @@ Retrieve the value of the node's environment with the
We will discuss Chef Environments in more detail later.
# Examining Chef::Node
Use `knife node list` to list all the node objects on the Chef Server.
> knife node list
Use `knife node show` to display a node object on the Chef Server.
> knife node show i-2b58ad4a
Node Name: i-2b58ad4a
Environment: _default
FQDN: domU-12-31-39-07-D5-65.compute-1.internal
Run List: role[base], role[webserver]
Roles: base, webserver
Recipes: apt, chef-client, webserver
Platform: ubuntu 10.04
# Examining Chef::Node
`knife node show` has several options to modify the output of the node
object. We can show only the run list:
> knife node show i-2b58ad4a -r
The Chef environment:
> knife node show -E i-2b58ad4a
chef_environment: _default
Or a specific attribute:
> knife node show i-2b58ad4a -a ec2.public_hostname
# Examining Chef::Node
The `Chef::Node` is actually a JSON object but the format returned is
a bit nicer for humans to read. Show the data in another format with
`-F` and specify a format. Valid alternate formats are JSON ("j"),
YAML ("y") or Text (default, or "t")
> knife node show i-2b58ad4a -Fj
> knife node show i-2b58ad4a -r -Fj
> knife node show i-2b58ad4a -a ec2 -Fj
# Examining Chef::Node in Shef
We can use `shef` to examine properties of the `Chef::Node`
object. Similar to `chef-client`, `shef` loads a `node` object on
startup, including attributes from Ohai.
> shef
loading configuration: none (standalone shef session)
Session type: standalone
Ohai2u jtimberman@localhost.localdomain!
chef >
# Chef::Node in Shef
Show the `Chef::Node` object itself:
chef > node
=> <Chef::Node:0xb75b9c @name="localhost.localdomain">
Show the node's name:
chef >
=> "localhost.localdomain
Show the node's environment and run list:
chef > node.chef_environment
=> "_default"
chef > node.run_list
# Chef::Node in Shef
Show some attributes about the node:
chef > node['ipaddress']
=> ""
chef > node['platform']
=> "ubuntu"
chef > node['platform_version']
=> "11.10"
# Summary
* Properties of the Chef::Node object
* Common attributes from ohai
* Original location of node attributes
* Node's run list
* Methods available in recipes
* Use `knife` and `shef` to examine nodes
# Questions

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