The role of anchor in puppet

Anchor Background: puppet Forge is an online module repository. Many puppet modules are uploaded for download. You can download a module and use it directly. You should not change the manifests in it.

However, in puppet2.6, when a class declares another class, the declared class resources will not be included by the external class, this makes it impossible for us to form a module with complex functions through some simple small class files. To solve this problem, anchor is introduced.

See: http://projects.puppetlabs.com/projects/puppet/wiki/Anchor_Pattern for specific examples

It can be seen that anchor exists to include the introduced class resources.

Before using anchor, make sure that the puppetlabs/stdlib module is installed. Note the following when using anchor:

L The contained class must be between two uniquely named anchor

L any included class must determine its relationship with anchor, for example:

Anchor {'ntp _ first ':}->Class['Ntp: Service'] ->Anchor {'ntp _ la ':}

 

In Versions later than puppet3.4.0, The contain method is used to replace anchor.

Class NTP {

File {'/etc/NTP. conf ':

...

Require => package ['ntp '],

Policy => class ['ntp: service'],

}

Contain NTP: Service

Package {'ntp ':

...

}

}

 

Include NTP

Exec {'/usr/local/bin/update_custom_timestamps.sh ':

Require => class ['ntp '],

}