/zap

Library cookbook for garbage collecting chef controlled resource sets.

Primary LanguageRubyApache License 2.0Apache-2.0

zap

Library cookbook for garbage collecting chef controlled resource sets.

One of the common pitfalls in chef land is the pattern of one deleting a resource definition from a recipe and the user wondering why the resource still exists on the system.

For example, on Monday a cronjob is added:

cron 'collect stats' do
  action	:create
  minute	0
  command '/usr/local/bin/collect-stats | mailto ops@nvwls.com'
end

After a few days, the issue is figured out and that cron resource is removed from the recipe. After uploading the new cookbook, they wonder why they are still receiving email.

The issue that chef is great for describing actions. I mean, action is part of the DSL.

At the 2013 Opscode Communit Summit, Matt Ray and I had a discussion regarding this issue. The name authoritative cookbook was coined. If chef is deploying files to a .d directory, if there are files in that directory not converged by a resource, those files should be removed.

This pattern has been added to https://github.com/Youscribe/sysctl-cookbook

I presented the zap pattern at ChefConf 2014. You can check out the video http://www.youtube.com/watch?v=4-So4AJlBI4&list=PL11cZfNdwNyMmx0msapJfuGsLV43C7XsA&feature=share&index=53 and the slides https://speakerdeck.com/nvwls/building-authoritative-resource-sets

Thanks

Users and groups support was provided by Sander Botman sbotman@schubergphilis.com. Yum_repository support was provided by Sander van Harmelen svanharmelen@schubergphilis.com Apt_repository support was provided by Helgi Þormar Þorbjörnsson helgi@php.net firewall support was provided by Ronald Doorn rdoorn@schubergphilis.com.

Resource/Provider

zap_directory

Actions

  • :delete - Delete files and symlinks in a directory

Attribute Parameters

  • pattern - Pattern of files to match, i.e. *.conf, defaults to *
  • recursive - Recurse into subdirectories, defaults to false

Examples

zap_directory '/etc/sysctl.d' do
  pattern '*.conf'
end

zap_crontab

Actions

  • :delete - Delete jobs from a user's crontab

Attribute Parameters

  • pattern - Pattern of job names match, i.e. test \#*, defaults to *

Examples

zap_crontab 'root' do
  pattern 'test \#*'
end

zap_users

Delete users from /etc/passwd style files. node['zap']['users']['keep'] contains an array of user names to keep, i.e. root.

Actions

  • :remove

Example

zap_users '/etc/passwd' do
  # only zap users whose uid is greater than 500
  filter { |u| u.uid > 500 }
end

zap_groups

Delete groups from /etc/group style files. node['zap']['groups']['keep'] contains an array of group names to keep, i.e. wheel.

Actions

  • :remove

Example

zap_groups '/etc/group' do
  filter { |g| g.gid > 500 && g.name != 'nrpe' }
end

zap_yum_repos

If you manage your yum repos using the yum_repository LWRP from the yum cookbook, you can use this provider to dynamically delete any unmanaged or obsolete repos.

Actions

  • :delete - Delete yum repos using the yum_repository LWRP from the yum cookbook

Attribute Parameters

  • pattern - Pattern of repository names to match, i.e. epel or update, defaults to *
  • immediately - Set to true if you want this action to be executed immediately, defaults to true

Example

zap_yum_repos '/etc/yum.repos.d' do
  pattern 'epel'
  immediately false
end

zap_apt_repos

If you manage your apt repos using the apt_repository LWRP from the apt cookbook, you can use this provider to dynamically delete any unmanaged or obsolete repos.

Actions

  • :remove - Delete apt repos using the apt_repository LWRP from the apt cookbook

Attribute Parameters

  • pattern - Pattern of repository names to match, i.e. ppa or update, defaults to *
  • immediately - Set to true if you want this action to be executed immediately, defaults to true

Example

zap_apt_repos '/etc/apt/sources.list.d' do
  pattern 'ppa'
  immediately false
  action :remove
end

zap_firewall

Delete all firewall rules that were not defined in Chef using the firewall cookbook.

Actions

  • :remove

Example

zap_firewall "cleaning up firewall"

zap

This the base HWRP.

Example

zap '/etc/sysctl.d' do
  klass [Chef::Resource::File, 'Chef::Resource::Template']
  collect { ::Dir.glob("#{base}/*") }
end

Recipes

zap::cron_d

Remove /etc/cron.d entries.