group resource¶
Use the group resource to manage a local group.
Syntax¶
The group resource has the following syntax:
group 'name' do
append true, false # default value: false
excluded_members String, Array
gid String, Integer
group_name String # default value: 'name' unless specified
members String, Array
non_unique true, false # default value: false
system true, false # default value: false
action Symbol # defaults to :create if not specified
end
where:
group
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.append
,excluded_members
,gid
,group_name
,members
,non_unique
, andsystem
are the properties available to this resource.
Actions¶
The group resource has the following actions:
:create
- Default. Create a group. If a group already exists (but does not match), update that group to match.
:manage
- Manage an existing group. This action does nothing if the group does not exist.
:modify
- Modify an existing group. This action raises an exception if the group does not exist.
: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.
:remove
- Remove a group.
Properties¶
The group resource has the following properties:
append
Ruby Type: true, false | Default Value:
false
How members should be appended and/or removed from a group. When
true
,members
are appended andexcluded_members
are removed. Whenfalse
, group members are reset to the value of themembers
property.excluded_members
Ruby Type: String, Array
Remove users from a group. May only be used when
append
is set totrue
.gid
Ruby Type: String, Integer
The identifier for the group.
group_name
Ruby Type: String | Default Value:
'name'
The name of the group. Default value: the
name
of the resource block. See “Syntax” section above for more information.ignore_failure
Ruby Type: true, false | Default Value:
false
Continue running a recipe if a resource fails for any reason.
members
Ruby Type: Array
Which users should be set or appended to a group. When more than one group member is identified, the list of members should be an array:
members ['user1', 'user2']
.non_unique
Ruby Type: true, false | Default Value:
false
Allow
gid
duplication. May only be used with theGroupadd
provider.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
retries
Ruby Type: Integer | Default Value:
0
The number of times to catch exceptions and retry the resource.
retry_delay
Ruby Type: Integer | Default Value:
2
The retry delay (in seconds).
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
system
Ruby Type: true, false | Default Value:
false
Set if a group belongs to a system group. Set to
true
if the group belongs to a system group.
Examples¶
The following examples demonstrate various approaches for using resources in recipes. If you want to see examples of how Chef uses resources in recipes, take a closer look at the cookbooks that Chef authors and maintains: https://github.com/chef-cookbooks.
Append users to groups
group 'www-data' do
action :modify
members 'maintenance'
append true
end
Add a user to group on the Windows platform
group 'Administrators' do
members ['domain\foo']
append true
action :modify
end