hostname resource¶
Use the hostname resource to set the system’s hostname, configure hostname and hosts config file, and re-run the Ohai hostname plugin so the hostname will be available in subsequent cookbooks.
New in Chef Client 14.0.
Syntax¶
The hostname resource has the following syntax:
hostname 'name' do
aliases Array, nil
compile_time true, false # default value: true
hostname String # default value: 'name' unless specified
ipaddress String
windows_reboot true, false # default value: true
action Symbol # defaults to :set if not specified
end
where:
hostname
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.aliases
,compile_time
,hostname
,ipaddress
, andwindows_reboot
are the properties available to this resource.
Actions¶
The hostname resource has the following actions:
:set
- Default action. Set the node’s hostname.
: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 hostname resource has the following properties:
aliases
Ruby Type: Array, nil | Default Value:
nil
An array of hostname aliases to use when configuring the hosts file.
compile_time
Ruby Type: true, false | Default Value:
true
Determines whether or not the resource shoul be run at compile time.
hostname
Ruby Type: String | Default Value:
'name'
Used to specify the hostname if it is different than the resource’s name.
ipaddress
Ruby Type: String | Default Value:
node["ipaddress"]
The IP address to use when configuring the hosts file. By default, this uses
node["ipaddress"]
information collected by Ohai.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
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
windows_reboot
Ruby Type: true, false | Default Value:
true
Determines whether or not Windows should be reboot after changing the hostname, as this is required for the change to take effect.
Examples¶
Set the hostname
hostname 'example' do
The example above sets the hostname to example
for the IP address, as detected by Ohai.
Manually specify the hostname and IP address
hostname 'statically_configured_host' do
hostname 'example'
ipaddress '198.51.100.2'
end