openssl_dhparam resource¶
Use the openssl_dhparam resource to generate dhparam.pem
files. If a valid dhparam.pem
file is found at the specified location, no new file will be created. If a file is found at the specified location, but it is not a valid dhparam file, it will be overwritten.
New in Chef Client 14.0.
Syntax¶
The openssl_dhparam resource has the following syntax:
openssl_dhparam 'name' do
generator Integer # default value: 2
group String
key_length Integer # default value: 2048
mode Integer, String # default value: 0640
owner String
path String # default value: 'name' unless specified
action Symbol # defaults to :create if not specified
end
where:
openssl_dhparam
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.generator
,group
,key_length
,mode
,owner
, andpath
are the properties available to this resource.
Actions¶
The openssl_dhparam resource has the following actions:
:create
- Default. Create the
dhparam.pem
file. :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 openssl_dhparam resource has the following properties:
generator
Ruby Type: Integer | Default Value:
2
The desired Diffie-Hellmann generator; available options are
2
and5
.group
Ruby Type: String
The group ownership applied to all files created by the resource.
key_length
Ruby Type: Integer | Default Value:
2048
The desired bit length of the generated key; available options are
1024
,2048
,4096
, and8192
.mode
Ruby Type: Integer, String | Default Value:
0640
The permission mode applied to all files created by the resource.
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 anotifies
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
The owner applied to all files created by the resource.
path
Ruby Type: String
The path to write the file to, if it differs from the resource name.
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 thenginx
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 examplenginx
) 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 dhparam file
openssl_dhparam '/etc/httpd/ssl/dhparam.pem'
Create a dhparam file with a specific key length
openssl_dhparam '/etc/httpd/ssl/dhparam.pem' do
key_length 4096
end
Create a dhparam file with specific user/group ownership
openssl_dhparam '/etc/httpd/ssl/dhparam.pem' do
owner 'www-data'
group 'www-data'
end
Manually specify the dhparam file path
openssl_dhparam 'httpd_dhparam' do
path '/etc/httpd/ssl/dhparam.pem'
end