ssh_known_hosts_entry resource¶

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Use the ssh_known_hosts_entry resource to add an entry for the specified host in /etc/ssh/ssh_known_hosts or a user’s known hosts file if specified.

New in Chef Client 14.3.

Syntax¶

The ssh_known_hosts_entry resource has the following syntax:

ssh_known_hosts_entry 'name' do
  file_location      String # default value: /etc/ssh/ssh_known_hosts
  group              String
  hash_entries       true, false # default value: false
  host               String # default value: 'name' unless specified
  key                String
  key_type           String # default value: rsa
  mode               String # default value: 0644
  owner              String # default value: root
  port               Integer # default value: 22
  timeout            Integer # default value: 30
  action             Symbol # defaults to :create if not specified
end

where:

ssh_known_hosts_entry 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.
file_location, group, hash_entries, host, key, key_type, mode, owner, port, and timeout are the properties available to this resource.

Actions¶

The ssh_known_hosts_entry resource has the following actions:

:create: Default. Create an entry in the ssh_known_hosts file.
:flush: Immediately flush the entries to the config file. Without this the actual writing of the file is delayed in the Chef run so all entries can be accumulated before writing the file out.
: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 ssh_known_hosts_entry resource has the following properties:

file_location

Ruby Type: String | Default Value: /etc/ssh/ssh_known_hosts

The location of the ssh known hosts file. Change this to set a known host file for a particular user.

group

Ruby Type: String

The file group for the ssh_known_hosts file.

hash_entries

Ruby Type: true, false | Default Value: false

Hash the hostname and addresses in the ssh_known_hosts file for privacy.

host

Ruby Type: String | Default Value: 'name'

The host to add to the known hosts file.

key

Ruby Type: String

An optional key for the host. If not provided this will be automatically determined.

key_type

Ruby Type: String | Default Value: rsa

The type of key to store.

mode

Ruby Type: String | Default Value: 0644

The file mode for the ssh_known_hosts file.

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

owner

Ruby Type: String | Default Value: root

The file owner for the ssh_known_hosts file.

port

Ruby Type: Integer | Default Value: 22

The server port that the ssh-keyscan command will use to gather the public key.

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

timeout

Ruby Type: Integer | Default Value: 30

The timeout in seconds for ssh-keyscan.