user_ulimit Resource

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Use the user_ulimit resource to create individual ulimit files that are installed into the /etc/security/limits.d/ directory.

New in Chef Infra Client 16.0.

Syntax

The full syntax for all of the properties that are available to the user_ulimit resource is:

user_ulimit 'name' do
  as_hard_limit              String, Integer
  as_limit                   String, Integer
  as_soft_limit              String, Integer
  core_hard_limit            String, Integer
  core_limit                 String, Integer
  core_soft_limit            String, Integer
  cpu_hard_limit             String, Integer
  cpu_limit                  String, Integer
  cpu_soft_limit             String, Integer
  filehandle_hard_limit      String, Integer
  filehandle_limit           String, Integer
  filehandle_soft_limit      String, Integer
  filename                   String
  locks_limit                String, Integer
  maxlogins_hard_limit       String, Integer
  maxlogins_limit            String, Integer
  maxlogins_soft_limit       String, Integer
  memory_limit               String, Integer
  msgqueue_hard_limit        String, Integer
  msgqueue_limit             String, Integer
  msgqueue_soft_limit        String, Integer
  process_hard_limit         String, Integer
  process_limit              String, Integer
  process_soft_limit         String, Integer
  rss_hard_limit             String, Integer
  rss_limit                  String, Integer
  rss_soft_limit             String, Integer
  rtprio_hard_limit          String, Integer
  rtprio_limit               String, Integer
  rtprio_soft_limit          String, Integer
  sigpending_hard_limit      String, Integer
  sigpending_limit           String, Integer
  sigpending_soft_limit      String, Integer
  stack_hard_limit           String, Integer
  stack_limit                String, Integer
  stack_soft_limit           String, Integer
  username                   String # default value: 'name' unless specified
  virt_limit                 String, Integer
  action                     Symbol # defaults to :create if not specified
end

where:

• user_ulimit is the resource.
• name is the name given to the resource block.
• action identifies which steps Chef Infra Client will take to bring the node into the desired state.
• as_hard_limit, as_limit, as_soft_limit, core_hard_limit, core_limit, core_soft_limit, cpu_hard_limit, cpu_limit, cpu_soft_limit, filehandle_hard_limit, filehandle_limit, filehandle_soft_limit, filename, locks_limit, maxlogins_hard_limit, maxlogins_limit, maxlogins_soft_limit, memory_limit, msgqueue_hard_limit, msgqueue_limit, msgqueue_soft_limit, process_hard_limit, process_limit, process_soft_limit, rss_hard_limit, rss_limit, rss_soft_limit, rtprio_hard_limit, rtprio_limit, rtprio_soft_limit, sigpending_hard_limit, sigpending_limit, sigpending_soft_limit, stack_hard_limit, stack_limit, stack_soft_limit, username, and virt_limit are the properties available to this resource.

Actions

The user_ulimit resource has the following actions:

:create

Create a ulimit configuration file. (default)

:delete

Delete an existing ulimit configuration file.

:nothing

This resource block doesn’t act unless notified by another resource to take action. Once notified, this resource block either runs immediately or is queued up to run at the end of a Chef Infra Client run.

Properties

The user_ulimit resource has the following properties:

as_hard_limit

Ruby Type: String, Integer

as_limit

Ruby Type: String, Integer

as_soft_limit

Ruby Type: String, Integer

core_hard_limit

Ruby Type: String, Integer

core_limit

Ruby Type: String, Integer

core_soft_limit

Ruby Type: String, Integer

cpu_hard_limit

Ruby Type: String, Integer

cpu_limit

Ruby Type: String, Integer

cpu_soft_limit

Ruby Type: String, Integer

filehandle_hard_limit

Ruby Type: String, Integer

filehandle_limit

Ruby Type: String, Integer

filehandle_soft_limit

Ruby Type: String, Integer

filename

Ruby Type: String | Default Value: lazy default

locks_limit

Ruby Type: String, Integer

maxlogins_hard_limit

Ruby Type: String, Integer

maxlogins_limit

Ruby Type: String, Integer

maxlogins_soft_limit

Ruby Type: String, Integer

memory_limit

Ruby Type: String, Integer

msgqueue_hard_limit

Ruby Type: String, Integer

msgqueue_limit

Ruby Type: String, Integer

msgqueue_soft_limit

Ruby Type: String, Integer

process_hard_limit

Ruby Type: String, Integer

process_limit

Ruby Type: String, Integer

process_soft_limit

Ruby Type: String, Integer

rss_hard_limit

Ruby Type: String, Integer

rss_limit

Ruby Type: String, Integer

rss_soft_limit

Ruby Type: String, Integer

rtprio_hard_limit

Ruby Type: String, Integer

rtprio_limit

Ruby Type: String, Integer

rtprio_soft_limit

Ruby Type: String, Integer

sigpending_hard_limit

Ruby Type: String, Integer

sigpending_limit

Ruby Type: String, Integer

sigpending_soft_limit

Ruby Type: String, Integer

stack_hard_limit

Ruby Type: String, Integer

stack_limit

Ruby Type: String, Integer

stack_soft_limit

Ruby Type: String, Integer

username

Ruby Type: String | Default Value: The resource block's name

virt_limit

Ruby Type: String, Integer

Common Resource Functionality

Chef resources include common properties, notifications, and resource guards.

Common Properties

The following properties are common to every resource:

compile_time

Ruby Type: true, false | Default Value: false

Control the phase during which the resource is run on the node. Set to true to run while the resource collection is being built (the compile phase). Set to false to run while Chef Infra Client is configuring the node (the converge phase).

ignore_failure

Ruby Type: true, false, :quiet | Default Value: false

Continue running a recipe if a resource fails for any reason. :quiet won’t display the full stack trace and the recipe will continue to run if a resource fails.

retries

Ruby Type: Integer | Default Value: 0

The number of attempts to catch exceptions and retry the resource.

retry_delay

Ruby Type: Integer | Default Value: 2

The delay in seconds between retry attempts.

sensitive

Ruby Type: true, false | Default Value: false

Ensure that sensitive resource data isn’t logged by Chef Infra Client.

Notifications

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.

If the referenced resource doesn’t exist, an error is raised. In contrast, subscribes won’t fail if the source resource isn’t found.

A timer specifies the point during a Chef Infra 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 a Chef Infra Client run.

:immediate, :immediately

Specifies that a notification should be run immediately, for each resource notified.

The syntax for notifies is:

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

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 doesn’t 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 doesn’t 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.

If the other resource doesn’t exist, the subscription won’t raise an error. Contrast this with the stricter semantics of notifies, which will raise an error if the other resource doesn’t exist.

A timer specifies the point during a Chef Infra 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 a Chef Infra Client run.

:immediate, :immediately

Specifies that a notification should be run immediately, for each resource notified.

The syntax for subscribes is:

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

Guards

A guard property can be used to evaluate the state of a node during the execution phase of a Chef Infra Client run. Based on the results of this evaluation, a guard property is then used to tell Chef Infra Client if it should continue executing a resource. A guard property accepts either a string value or a Ruby block value:

• A string is executed as a shell command. If the command returns 0, the guard is applied. If the command returns any other value, then the guard property isn’t applied. String guards in a powershell_script run Windows PowerShell commands and may return true in addition to 0.
• A block is executed as Ruby code that must return either true or false. If the block returns true, the guard property is applied. If the block returns false, the guard property isn’t applied.

A guard property is useful for ensuring that a resource is idempotent by allowing that resource to test for the desired state as it’s being executed, and then if the desired state is present, for Chef Infra Client to don’thing.

The following properties can be used to define a guard that’s evaluated during the execution phase of a Chef Infra Client run:

not_if

Prevent a resource from executing when the condition returns true.

only_if

Allow a resource to execute only if the condition returns true.

Examples

The following examples demonstrate various approaches for using the user_ulimit resource in recipes:

Set filehandle limit for the tomcat user:

user_ulimit 'tomcat' do
  filehandle_limit 8192
end

Specify a username that differs from the name given to the resource block:

user_ulimit 'Bump filehandle limits for tomcat user' do
  username 'tomcat'
  filehandle_limit 8192
end

Set filehandle limit for the tomcat user with a non-default filename:

user_ulimit 'tomcat' do
  filehandle_limit 8192
  filename 'tomcat_filehandle_limits.conf'
end