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Do you know all of Puppet?
Julien Pivotto (@roidelapluie)
Budapest DevOps Meetup
April 23, 2017
$::user
Julien Pivotto
@roidelapluie on irc/github/twitter
Puppet user since 2011 (Puppet 0.24)
VoxPupuli member (& security officer)
inuits
Scope
(Ab)using Puppet
The Puppet community
Puppet DSL tips and tricks
Why?
Puppet present in lots of places
There are lots of new exciting features
But the puppet DSL has a strong trunk
Many don't use all of its capacities
Using Puppet
Creative Commons Attribution 2.0 https://www.flickr.com/photos/jimmcd/4859841581
Custom facts
FACTER_bootstrap=true puppet agent ­­test
Useful for 1-time facts, or overwriting existing
facts (e.g ipaddress) without code.
Custom facts (scripts)
./mycustomscript
datacenter=mydc
Custom facts (ruby)
# Interrupt Remapping
# http://www.novell.com/support/kb/doc.php?id=7014344
# https://access.redhat.com/site/solutions/110053
# https://access.redhat.com/site/solutions/722593
Facter.add("is_interrupt_remapping_broken") do
  confine :kernel => "Linux"
  setcode do
    output = Facter::Util::Resolution.exec(
    '/sbin/lspci ­nn | grep ­E
    '8086:(340[36].*rev 13|3405.*rev
    (12|13|22))'')
    if output.nil? or output.empty?
      result = false
    else
      result = true
    end
    result
  end
end
The Puppet resource face
$ puppet resource file /home/u/.vimrc
file { '/home/u/.vimrc':
  ensure  => 'file',
  content => '{md5}d414e9800998ecf8427e',
  ctime   => '2017­04­25 11:01:05 +0100',
  group   => '1000',
  mode    => '0644',
  mtime   => '2017­04­25 15:02:03 +0100',
  owner   => '1000',
  type    => 'file',
}
$ puppet resource file .hushlogin mode=0755
Pluginsync
Im modules:
lib/puppet/reports/prometheus.rb
lib/augeas/lenses/tmpfiles.aug
Share reports processors
Share augeas lenses
Share facts
Puppet as a CA
Each Puppet agent has a certificate
It is used and maintained
It is easy to sign/generate
e.g.: The foreman
Tooling for your laptop
puppet parser validate
Built into puppet
find . -name "*.pp" -exec puppet parser
validate + ";"
Style and Best practices
Puppet-lint 2
Plugins:
parameter_documentation
roles_and_profiles
package_ensure
unquoted_string
legacy_facts
many more...
The community
Creative Commons Attribution 2.0 https://www.flickr.com/photos/mrmystery/15868773733/
Puppet Modules
Modules are awesome
They have clear API's
Easy to make code ready for everyone
Sharing is part of lots of Puppet users
mindset
The modules ecosystem
Puppet Forge
Github
Puppet is aging
Lots of old, unmaintained modules
Modules not Puppet 4 compatibles
Modules untested
Modules without maintainers
The world evolves fast
Ruby versions, gems, change fast
Keeping an up to date public CI (with travis) is
hard
But you don't need to change everymodules
everyday ..
Vox Pupuli
Creative Commons Attribution-ShareAlike 4.0 https://github.com/voxpupuli/logos
What is Vox Pupuli?
Vox Pupuli is a community
We are sysadmins/developers/... puppet
users
We share values
Started in 2014
What do we do
We share Puppet modules
We maintain them, improve them
We provide a nice home for Puppet modules
How
We automate
We are experts (we use those modules)
We are an important group (98 people)
We enforce our Code of Conduct
Join us (with or without code)
Open Pull requests (we have 118 repos)
Share your modules
Get in touch
#voxpupuli on IRC
voxpupuli
http://github.com/voxpupuli
voxpupuli@groups.io
The Puppet DSL
Creative Commons Attribution 2.0 https://www.flickr.com/photos/mujitra/4421810399
The Puppet DSL
Awareness of its potential
Write less code
Avoid bad patterns
The File resource
file { '/etc/motd'
  ensure  => file,
  content => 'foobarbarfoofoobar',
}
content => file()
file { '/etc/motd':
  ensure  => file,
  content => file("${module_name}/motd"),
}
For small, text files (file content is in the catalog)
Since Puppet 3.7.0
validate_cmd
file { '/etc/corosync/corosync.conf':
  ensure       => file,
  validate_cmd => '/usr/sbin/corosync ­t %',
}
Verify the file before replacing it
Since Puppet 3.5.0
Alternative in stdlib for older versions
show_diff
file { '/etc/app/secrets':
  content   => 'my secret content',
  show_diff => false,
}
Since Puppet 3.2.1
replace
file { '/etc/installtime':
  content => template('date.erb'),
  replace => no,
}
Since Puppet 0.19.0
backup
file { '/etc/hosts':
  content => template('hosts.erb'),
  backup  => '.bak',
}
Since a very long time...
source
file {
  '/etc/issue.net':
    source => '/etc/motd'
}
Since a very long time...
autorequires
Don't do:
file {
  '/tmp':
}
file {
  '/tmp/foo':
    require => File['/tmp'],
}
because files auto-require their parents (and
owners, groups...)
Since Puppet 0.10.2
other autorequires
Exec, Cron require their users
Mount require its parents
Exec requires its File[cwd]
other autodependencies
resources types can implement autonotify and
autosubscribe
(this is used in puppet-corosync)
Since Puppet 4.0.0
noop
package {
  'ntpd':
    ensure => latest,
    noop   => true,
}
noop is not only a global setting - it is also a
metaparameter that can be applied to any
resource
Present since a very long time...
purging resources
resources {
  'cron':
    purge => true,
    noop  => true,
}
Present since Puppet 0.22.0
Present since 3.5.0 (for cron resources)
exec tries
exec {
  '/bin/wget 127.0.0.1':
    tries     => 10,
    try_sleep => 1,
}
Present since Puppet 2.6.0
arrays
file {
  '/usr/bin/sometimesexecutable':
    mode => ['0755', '0644'],
}
Will accept both modes, and set 0755 if not
matching.
Can be used with most of the properties.
Since Puppet 0.23.1
Requirements
define foo::bar {
  Package['foo'] ­> Foo::Bar[$name]
}
Is the same as:
foo::bar {'barfoo':
  require => Package['foo'],
}
Aliases
Instead of:
file { "/tmp/foo/bar/bar.foo/foobar":
  ensure => file,
}
service { 'barfoo':
  require => File['/tmp/foo/bar/bar.foo/foobar'],
}
Aliases
Use:
file {"/tmp/foo/bar/bar.foo/foobar":
  ensure => file,
  alias  => 'foobar',
}
service {'barfoo':
  require => File['foobar'],
}
Since a very long time...
Loglevel
exec {
  '/bin/mybrokenexec':
    loglevel => debug,
}
Since Puppet 0.23.1
Conclusion
Creative Commons Attribution 2.0 https://www.flickr.com/photos/wwworks/6320539775/
Puppet
Puppet is in the sysadmins basic tools now
Tooling around it is great
Very active and mature community
Powerful DSL ; can handle many scenarios
Julien Pivotto
roidelapluie
roidelapluie@inuits.eu
Inuits
https://inuits.eu
info@inuits.eu
Contact

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