dnf_package resource¶
Use the dnf_package resource to install, upgrade, and remove packages with DNF for Fedora platforms. The dnf_package resource is able to resolve provides
data for packages much like DNF can do when it is run from the command line. This allows a variety of options for installing packages, like minimum versions, virtual provides, and library names.
Note
In many cases, it is better to use the package resource instead of this one. This is because when the package resource is used in a recipe, the chef-client will use details that are collected by Ohai at the start of the chef-client run to determine the correct package application. Using the package resource allows a recipe to be authored in a way that allows it to be used across many platforms.
Syntax¶
A dnf_package resource block manages a package on a node, typically by installing it. The simplest use of the dnf_package resource is:
dnf_package 'package_name'
which will install the named package using all of the default options and the default action (:install
).
The full syntax for all of the properties that are available to the dnf_package resource is:
dnf_package 'name' do
arch String, Array
flush_cache Array
ignore_failure true, false # defaults to ``false``
notifies # see description
options String
package_name String, Array # defaults to 'name' if not specified
retries Integer
retry_delay Integer
sensitive true, false # defaults to ``false``
source String
subscribes # see description
timeout String, Integer
version String, Array
action Symbol # defaults to :install if not specified
end
where:
dnf_package
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.arch
,flush_cache
, etc. are the properties available to this resource. See the Properties section below for more information about all of the properties that may be used with this resource.
Actions¶
The dnf_package resource has the following actions:
:install
- Default. Install a package. If a version is specified, install the specified version of the package.
:lock
- Locks the DNF package to a specific version.
: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.
:purge
- Purge a package. This action typically removes the configuration files as well as the package.
:remove
- Remove a package.
:unlock
- Unlocks the DNF package so that it can be upgraded to a newer version.
:upgrade
- Install a package and/or ensure that a package is the latest version. This action will ignore the
version
attribute.
Properties¶
The dnf_package resource has the following properties:
arch
Ruby Type: String, Array
The architecture of the package to be installed or upgraded. This value can also be passed as part of the package name.
flush_cache
Ruby Type: Array
Flush the in-memory cache before or after a DNF operation that installs, upgrades, or removes a package. Default value:
[ :before, :after ]
. The value may also be a Hash:( { :before => true/false, :after => true/false } )
.DNF automatically synchronizes remote metadata to a local cache. The chef-client creates a copy of the local cache, and then stores it in-memory during the chef-client run. The in-memory cache allows packages to be installed during the chef-client run without the need to continue synchronizing the remote metadata to the local cache while the chef-client run is in-progress.
As an array:
dnf_package 'some-package' do #... flush_cache [ :before ] #... end
and as a Hash:
dnf_package 'some-package' do #... flush_cache( { :after => true } ) #... end
Note
The
flush_cache
property does not flush the local DNF cache! Use dnf tools—dnf clean metadata
,dnf clean packages
,dnf clean all
—to clean the local DNF cache.ignore_failure
Ruby Type: true, false | Default Value:
false
Continue running a recipe if a resource fails for any reason.
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
options
Ruby Type: String, Array
One (or more) additional command options that are passed to the command.
package_name
Ruby Type: String, Array
One of the following: the name of a package, the name of a package and its architecture, the name of a dependency. Default value: the
name
of the resource block. See “Syntax” section above for more information.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).
sensitive
Ruby Type true, false | Default Value:
false
Ensure that sensitive resource data is not logged by the chef-client.source
Ruby Type: String
Optional. The path to a package in the local file system.
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
timeout
Ruby Type: String, Integer
The amount of time (in seconds) to wait before timing out.
version
Ruby Type: String, Array
The version of a package to be installed or upgraded. This property is ignored when using the
:upgrade
action.
Multiple Packages¶
A resource may specify multiple packages and/or versions for platforms that use Yum, DNF, Apt, Zypper, or Chocolatey package managers. Specifing multiple packages and/or versions allows a single transaction to:
- Download the specified packages and versions via a single HTTP transaction
- Update or install multiple packages with a single resource during the chef-client run
For example, installing multiple packages:
package %w(package1 package2)
Installing multiple packages with versions:
package %w(package1 package2) do
version [ '1.3.4-2', '4.3.6-1']
end
Upgrading multiple packages:
package %w(package1 package2) do
action :upgrade
end
Removing multiple packages:
package %w(package1 package2) do
action :remove
end
Purging multiple packages:
package %w(package1 package2) do
action :purge
end
Notifications, via an implicit name:
package %w(package1 package2) do
action :nothing
end
log 'call a notification' do
notifies :install, 'package[package1, package2]', :immediately
end
Note
Notifications and subscriptions do not need to be updated when packages and versions are added or removed from the package_name
or version
properties.
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.
Install an exact version
dnf_package 'netpbm = 10.35.58-8.el5'
Install a minimum version
dnf_package 'netpbm >= 10.35.58-8.el5'
Install a minimum version using the default action
dnf_package 'netpbm'
To install a package
dnf_package 'netpbm' do
action :install
end
To install a partial minimum version
dnf_package 'netpbm >= 10'
To install a specific architecture
dnf_package 'netpbm' do
arch 'i386'
end
or:
dnf_package 'netpbm.x86_64'
To install a specific version-release
dnf_package 'netpbm' do
version '10.35.58-8.el5'
end
To install a specific version (even when older than the current)
dnf_package 'tzdata' do
version '2011b-1.el5'
end
Handle cookbook_file and dnf_package resources in the same recipe
When a cookbook_file resource and a dnf_package resource are both called from within the same recipe, use the flush_cache
attribute to dump the in-memory DNF cache, and then use the repository immediately to ensure that the correct package is installed:
cookbook_file '/etc/yum.repos.d/custom.repo' do
source 'custom'
mode '0755'
end
dnf_package 'only-in-custom-repo' do
action :install
flush_cache [ :before ]
end