Chef

Table Of Contents

knife node

A node is any physical, virtual, or cloud machine that is configured to be maintained by a chef-client.

The knife node subcommand is used to manage the nodes that exist on a Chef server.

Note

Review the list of common options available to this (and all) Knife subcommands and plugins.

bulk delete

The bulk delete argument is used to delete one or more nodes that match a pattern defined by a regular expression. The regular expression must be within quotes and not be surrounded by forward slashes (/).

Syntax

This argument has the following syntax:

$ knife node bulk delete REGEX

Options

This command does not have any specific options.

Examples

The following examples show how to use this Knife subcommand:

Bulk delete nodes

Use a regular expression to define the pattern used to bulk delete nodes:

$ knife node bulk delete "^[0-9]{3}$"

Type Y to confirm a deletion.

create

The create argument is used to add a node to the Chef server. Node data is stored as JSON on the Chef server.

Syntax

This argument has the following syntax:

$ knife node create NODE_NAME

Options

This command does not have any specific options.

Examples

The following examples show how to use this Knife subcommand:

Create a node

To add a node, enter:

$ knife node create node1

In the $EDITOR enter the node data in JSON:

## sample:
{
   "normal": {
   },
   "name": "foobar",
   "override": {
   },
   "default": {
   },
   "json_class": "Chef::Node",
   "automatic": {
   },
   "run_list": [
      "recipe[zsh]",
      "role[webserver]"
   ],
   "chef_type": "node"
}

When finished, save it.

delete

The delete argument is used to delete a node from the Chef server.

Note

Deleting a node will not delete any corresponding API clients.

Syntax

This argument has the following syntax:

$ knife node delete NODE_NAME

Options

This command does not have any specific options.

Examples

The following examples show how to use this Knife subcommand:

Delete a node

$ knife node delete node_name

edit

The edit argument is used to edit the details of a node on a Chef server. Node data is stored as JSON on the Chef server.

Syntax

This argument has the following syntax:

$ knife node edit NODE_NAME (options)

Options

This argument has the following options:

-a, --all
Displays a node in the $EDITOR. By default, attributes that are default, override, or automatic are not shown.

Examples

The following examples show how to use this Knife subcommand:

Edit a node

To edit the data for a node named “node1”, enter:

$ knife node edit node1 -a

Update the role data in JSON:

## sample:
{
   "normal": {
   },
   "name": "node1",
   "override": {
   },
   "default": {
   },
   "json_class": "Chef::Node",
   "automatic": {
   },
   "run_list": [
      "recipe[devops]",
      "role[webserver]"
   ],
   "chef_type": "node"
}

When finished, save it.

from file

The from file argument is used to create a node using existing node data as a template.

Syntax

This argument has the following syntax:

$ knife node from file FILE

Options

This command does not have any specific options.

knife.rb Settings

Note

See knife.rb for more information about how to add optional settings to the knife.rb file.

The following knife node from file settings can be added to the knife.rb file:

knife[:print_after]
Use to add the --print-after option.

Examples

The following examples show how to use this Knife subcommand:

Create a node using a JSON file

To add a node using data contained in a JSON file:

$ knife node from file "path to JSON file"

list

The list argument is used to view all of the nodes that exist on a Chef server.

Syntax

This argument has the following syntax:

$ knife node list (options)

Options

This argument has the following options:

-w, --with-uri
Indicates that the corresponding URIs will be shown.

knife.rb Settings

Note

See knife.rb for more information about how to add optional settings to the knife.rb file.

The following knife node list settings can be added to the knife.rb file:

knife[:environment]
Use to add the --environment option.

Examples

The following examples show how to use this Knife subcommand:

View a list of nodes

To verify the list of nodes that are registered with the Chef server, enter:

$ knife node list

to return something similar to:

i-12345678
rs-123456

run_list add

A run-list is an ordered list of roles and/or recipes that are run in an exact order. A run-list is always specific to the node on which it runs, though it is possible for many nodes to have run-lists that are similar or even identical. The items within a run-list are maintained using Knife and are uploaded to the Chef server and stored as part of the node object for each node. The chef-client always configures a node in the exact order specified by its run-list and will never run the same recipe twice.

The run_list add argument is used to add run-list items (roles or recipes) to a node.

A run-list must be in one of the following formats: fully qualified, cookbook, or default. Both roles and recipes must be in quotes, for example:

'role[ROLE_NAME]'

or

'recipe[COOKBOOK::RECIPE_NAME]'

Use a comma to separate roles and recipes when adding more than one item the run-list:

'recipe[COOKBOOK::RECIPE_NAME],COOKBOOK::RECIPE_NAME,role[ROLE_NAME]'

Syntax

This argument has the following syntax:

$ knife node run_list add NODE_NAME RUN_LIST_ITEM (options)

Options

This argument has the following options:

-a ITEM, --after ITEM
Use this to add the run list item after the specified run list item.
-b ITEM, --before ITEM
Use this to add the run list item before the specified run list item.

knife.rb Settings

Note

See knife.rb for more information about how to add optional settings to the knife.rb file.

The following knife node run list add settings can be added to the knife.rb file:

knife[:after]
Use to add the --after option.
knife[:run_list]
Use for the run-list that is passed as part of a the command itself.

Examples

The following examples show how to use this Knife subcommand:

Add a role

To add a role to a run list, enter:

$ knife node run_list add node 'role[ROLE_NAME]'

Add roles and recipes

To add roles and recipes to a run list, enter:

$ knife node run_list add node 'recipe[COOKBOOK::RECIPE_NAME],recipe[COOKBOOK::RECIPE_NAME],role[ROLE_NAME]'

Add a recipe with a FQDN

To add a recipe to a run list using the fully qualified format, enter:

$ knife node run_list add node 'recipe[COOKBOOK::RECIPE_NAME]'

Add a recipe with a cookbook

To add a recipe to a run list using the cookbook format, enter:

$ knife node run_list add node 'COOKBOOK::RECIPE_NAME'

Add the default recipe

To add the default recipe of a cookbook to a run list, enter:

$ knife node run_list add node 'COOKBOOK'

run_list remove

The run_list remove argument is used to remove run-list items (roles or recipes) from a node. A recipe must be in one of the following formats: fully qualified, cookbook, or default. Both roles and recipes must be in quotes, for example: 'role[ROLE_NAME]' or 'recipe[COOKBOOK::RECIPE_NAME]'. Use a comma to separate roles and recipes when removing more than one, like this: 'recipe[COOKBOOK::RECIPE_NAME],COOKBOOK::RECIPE_NAME,role[ROLE_NAME]'.

Syntax

This argument has the following syntax:

$ knife node run_list remove NODE_NAME RUN_LIST_ITEM

Options

This command does not have any specific options.

knife.rb Settings

Note

See knife.rb for more information about how to add optional settings to the knife.rb file.

The following knife node run list remove settings can be added to the knife.rb file:

knife[:run_list]
Use for the run-list that is passed as part of a the command itself.

Examples

The following examples show how to use this Knife subcommand:

Remove a role

To remove a role from a run list, enter:

$ knife node run_list remove node 'role[ROLE_NAME]'

Remove a run-list

To remove a recipe from a run list using the fully qualified format, enter:

$ knife node run_list remove node 'recipe[COOKBOOK::RECIPE_NAME]'

run_list set

The run_list set argument is used to set the run-list for a node. A recipe must be in one of the following formats: fully qualified, cookbook, or default. Both roles and recipes must be in quotes, for example: 'role[ROLE_NAME]' or 'recipe[COOKBOOK::RECIPE_NAME]'. Use a comma to separate roles and recipes when removing more than one, like this: 'recipe[COOKBOOK::RECIPE_NAME],COOKBOOK::RECIPE_NAME,role[ROLE_NAME]'.

Syntax

This argument has the following syntax:

$ knife node run_list set NODE_NAME RUN_LIST_ITEM

Options

This command does not have any specific options.

Examples

None.

show

The show argument is used to display information about a node.

Syntax

This argument has the following syntax:

$ knife node show NODE_NAME (options)

Options

This argument has the following options:

-a ATTR, --attribute ATTR
The attribute (or attributes) to show.
-l, --long
Display long output when searching nodes while using the default summary format.
-m, --medium
Display more, but not all, of a node’s data when searching using the default summary format.
-r, --run-list
Indicates that only the run-list will be shown.

Examples

The following examples show how to use this Knife subcommand:

Show all data about nodes

To view all data for a node named “build”, enter:

$ knife node show build

to return:

Node Name:   build
Environment: _default
FQDN:
IP:
Run List:
Roles:
Recipes:
Platform:

Show basic information about nodes

To show basic information about a node, truncated and nicely formatted:

knife node show <node_name>

Show all data about nodes, truncated

To show all information about a node, nicely formatted:

knife node show -l <node_name>

Show attributes

To list a single node attribute:

knife node show <node_name> -a <attribute_name>

where <attribute_name> is something like kernel or platform. (This doesn’t work for nested attributes like node[kernel][machine] because knife node show doesn’t understand nested attributes.)

Show the FQDN

To view the FQDN for a node named “i-12345678”, enter:

$ knife node show i-12345678 -a fqdn

to return:

fqdn: ip-10-251-75-20.ec2.internal

Show a run-list

To view the run list for a node named “dev”, enter:

$ knife node show dev -r

Show as JSON data

To view information in JSON format, use the -F common option as part of the command like this:

$ knife role show devops -F json

Other formats available include text, yaml, and pp.

Show as raw JSON data

To view node information in raw JSON, use the -l or --long option:

knife node show -l -F json <node_name>

and/or:

knife node show -l --format=json <node_name>