swap_file resource¶

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Use the swap_file resource to create or delete swap files on Linux systems, and optionally to manage the swappiness configuration for a host.

New in Chef Client 14.0.

Syntax¶

The swap_file resource has the following syntax:

swap_file 'name' do
  path            String # default value: 'name' unless specified
  persist         true, false # default value: false
  size            Integer
  swappiness      Integer
  timeout         Integer # default value: 600
  action          Symbol # defaults to :create if not specified
end

where:

swap_file is the resource.
name is the name given to the resource block.
action identifies which steps the chef-client will take to bring the node into the desired state.
path, persist, size, swappiness, and timeout are the properties available to this resource.

Actions¶

The swap_file resource has the following actions:

:create: Default. Create a swap file.
:remove: Remove a swap file and disable swap.
:nothing: Define this resource block to do nothing until notified by another resource to take action. When this resource is notified, this resource block is either run immediately or it is queued up to be run at the end of the Chef Client run.

Properties¶

The swap_file resource has the following properties:

notifies

Ruby Type: Symbol, ‘Chef::Resource[String]’

A resource may notify another resource to take action when its state changes. Specify a 'resource[name]', the :action that resource should take, and then the :timer for that action. A resource may notify more than one resource; use a notifies statement for each resource to be notified.

A timer specifies the point during the Chef Client run at which a notification is run. The following timers are available:

:before: Specifies that the action on a notified resource should be run before processing the resource block in which the notification is located.
:delayed: Default. Specifies that a notification should be queued up, and then executed at the end of the Chef Client run.
:immediate, :immediately: Specifies that a notification should be run immediately, per resource notified.

The syntax for notifies is:

notifies :action, 'resource[name]', :timer

path

Ruby Type: String | Default Value: 'name'

The path where the swap file will be created on the system, if it differs from the resource block name.

persist

Ruby Type: true, false | Default Value: false

Persist the swapon.

size

Ruby Type: Integer

The size (in MBs) of the swap file.

swappiness

Ruby Type: Integer

The swappiness value to set on the system.

timeout

Ruby Type: Integer | Default Value: 600

Timeout for dd / fallocate commands.

subscribes

Ruby Type: Symbol, ‘Chef::Resource[String]’

A resource may listen to another resource, and then take action if the state of the resource being listened to changes. Specify a 'resource[name]', the :action to be taken, and then the :timer for that action.

Note that subscribes does not apply the specified action to the resource that it listens to - for example:

file '/etc/nginx/ssl/example.crt' do
   mode '0600'
   owner 'root'
end

service 'nginx' do
   subscribes :reload, 'file[/etc/nginx/ssl/example.crt]', :immediately
end

In this case the subscribes property reloads the nginx service whenever its certificate file, located under /etc/nginx/ssl/example.crt, is updated. subscribes does not make any changes to the certificate file itself, it merely listens for a change to the file, and executes the :reload action for its resource (in this example nginx) when a change is detected.

A timer specifies the point during the Chef Client run at which a notification is run. The following timers are available:

:before: Specifies that the action on a notified resource should be run before processing the resource block in which the notification is located.
:delayed: Default. Specifies that a notification should be queued up, and then executed at the end of the Chef Client run.
:immediate, :immediately: Specifies that a notification should be run immediately, per resource notified.

The syntax for subscribes is:

subscribes :action, 'resource[name]', :timer

Examples¶

Create a swap file

swap_file '/dev/sda1' do
  size 1024
end

Remove a swap file

swap_file '/dev/sda1' do
  action :remove
end