As the Puppet community grows by leaps and bounds we find ourselves having many of the same problems other software development communities have. Whether its libraries in C, JARs in Java, or gems in Ruby the basic unit of software can be a huge source of problems. With the proliferation of modules on the forge, Github, or internally grow we face the same problems. How many times have you gone to pull in a module only to find it requires a conflicting sudo module? How many Apache modules are there and why are they all different? Where did that class go, the version only changed by 0.0.1? As a community we should address these challenges early or face our own module hell. Chad Metcalf Infrastructure Engineer, WibiData Chad Metcalf leads the Infrastructure Engineering team at WibiData. His team is charged with developing the infrastructure, tools and automation that help drive a company building Big Data Applications. Previously he lead the Infrastructure Operations team at Cloudera building large Hadoop clusters and occasionally pretending to be a network engineer. When not pretending to be someone who understands networking he enjoys living in San Francisco, taking his wife out for dinner, and playing with his 75 pound pit-mix, River.

1. Growing Pains:
Avoiding Module
Hell
Chad Metcalf
@metcalfc
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5. As do many stories,
it all begins with ...
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6. $ sudo
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9. sudo::conf { 'web':
source => 'puppet:///files/etc/sudoers.d/web',
}
sudo::conf { 'admins':
priority => 10,
content => "%admins ALL=(ALL) NOPASSWD: ALLn",
}
sudo::conf { 'joe':
priority => 60,
source => 'puppet:///files/etc/sudoers.d/users/joed',
}
Saturday, August 24, 13

10. sudo::rule { "extra_rule":
ensure => present,
who => 'bob',
commands => "/usr/sbin/systemctl",
nopass => false,
comment => "what ever you like",
}
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12. Infrastructure as Code
Module as an API
Source Code Management
Verification andValidation
Release Management
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24. semver.org
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25. MAJOR.MINOR.PATC
H
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26. MAJOR version when you
make incompatible API
changes
1.x.x
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27. MINOR version when you add
functionality in a backwards-
compatible manner
x.0.x
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28. PATCH version when you make
backwards-compatible bug
fixes
x.x.0
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29. Its OK to
go:
1.0.
0
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31. Easy to learn
Easy to use
Hard to
misuse
Easy to
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32. Gather
requirements
Use cases
Don’t over specify
Private as possible
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37. Nifty
Nifty::Firewall
Nifty::Monitoring
Nifty::Supervisor
iptables
Icinga
Monit
Firewall::Nifty
Monitoring::Nifty
Supervisor::Nifty
Saturday, August 24, 13

38. Nifty
Nifty::Firewall
Nifty::Monitoring
Nifty::Supervisor
pf
Sensu
Supervisord
Firewall::Nifty
Monitoring::Nifty
Supervisor::Nifty
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40. Don’t Specify
ALL THE THINGS!!!
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41. define apache::vhost (
$server_admin
$server_name = '',
$docroot = '',
$docroot_create = false,
$docroot_owner = 'root',
$docroot_group = 'root',
$port = '80',
$ssl = false,
$template = 'apache/virtualhost/vho
$priority = '50',
$serveraliases = '',
$env_variables = '',
$passenger = false,
$passenger_high_performance = true,
$passenger_max_pool_size = 12,
$passenger_pool_idle_time = 1200,
$passenger_max_requests = 0,
$passenger_stat_throttle_rate = 30,
$passenger_rack_auto_detect = true,
$passenger_rails_auto_detect = false,
$passenger_rails_env = '',
Saturday, August 24, 13

42. <property>
<name>mapred.map.output.compression.codec</name>
<value>org.apache.hadoop.io.compress.SnappyCodec</valu
</property>
<property>
<name>mapred.compress.map.output</name>
<value>true</value>
</property>
<property>
<name>io.sort.factor</name>
<value>64</value>
</property>
<property>
<name>io.sort.record.percent</name>
<value>0.05</value>
</property>
<property>
<name>io.sort.spill.percent</name>
<value>0.8</value>
</property>
<property>
<name>mapred.reduce.parallel.copies</name>
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43. "foobar-cluster": {
"mapred-options": [
{
"name": "mapred.map.output.compression.codec",
"value": "org.apache.hadoop.io.compress.SnappyCode
},
{
"name": "mapred.compress.map.output",
"value": "true"
},
{
"name": "io.sort.factor",
"value": "64"
},
{
"name": "io.sort.record.percent",
"value": "0.05"
},
{
"name": "mapred.map.tasks.speculative.execution",
{
"name": "mapred.reduce.tasks.speculative.execution
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