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Christoph Leithner, Founder at celix

Puppet & Perforce: Versioning Everything for Deployments

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• What is the starting Point of our Journey to Continuous Delivery?

• Continuous Integration– Source Code Checkout– Static Code Analysis– Automated Tests– Compilation– Packaging

Continuous Delivery Gap Analysis

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• Database Structure• Database Content• Installable Software

– Libraries– Executables– OS Packages– Installers

• Some Type of Deployment

Continuous Delivery Gap Analysis

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Types of Deployments

PersonalOnly a Guru understands the system and is able to deploy it

Manual

Defined

There enough Documentation so we do not always have to ask the Guru if we want to deploy

ScriptedScripts are available to setup most of the Components of our System

We use IT-Automation to deploy and enforce our Deployment – no manual changes.

Defined Deployments are not possible without IT-Automation, Traceability and Discipline

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• Not all Changes to Dependencies trigger a Build• DEV-Database is populated with Snapshots • DEV-Database Changes are not tracked• Semi-automated DEV-Deployments cause Delays• Only some aspects of the System are managed by

Continuous Integration – no full Stack Deployment• Builds/Deployments are not reproducible

Common Pain Points

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Version Everything for Deployments

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• Developer Code• Deployment Code• Configuration Data• Database Structure• Database Content• Installable Software• Documentation

Version Everything for Deployments

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Version Puppet Code and Configuration Data

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Puppet Module

module_name

manifests

files

templates

lib

spec

tests

Modulefile

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Puppet Environment

puppet module install puppetlabs-ntp --version 0.2.0puppet module install puppetlabs-apache --version 0.6.0

firewall

ntp

stdlib

apache

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Reusing Modules from Puppet Forge

forge

puppetlabs-apache

puppetlabs-stdlib

puppetlabs-firewall

puppetlabs-apache

puppetlabs-stdlib

puppetlabs-firewall

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• Module Reuse is the fastest way of Automation• But it is not as easy as it might seem to write a

reusable Puppet Module• “We have this Module managing …, but I cannot

share it. It contains too many Site specific Parameters”

• Separating Module Code from Configuration Data is key for Module Reuse

Module Reuse

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• Puppet 3.0 integrates Hiera for Configuration Data• Hiera defines a list of Backends• Hiera defines a Lookup Hierarchy

:hierarchy - “%{clientcert}” - “%{environment}” - “%{osfamily}”

Versioning Configuration Data

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Hiera Site Configururation Data

firewall

stdlib

apache

hiera

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Hiera in Module Configuration Data

module_name

manifests

files

templates

lib

spec

tests

Modulefile

data

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Version Database Structure and Content

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• DB Structure– DB Dump– DB Snapshot– SQL Scripts

• Creating DB Structure with SQL Scripts1. Create all Tables

2. Fill all Tables

3. Create/Enable all Relational Constraints, Triggers etc.

Version DB Structure

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• DB Content Types– System Data– Configuration Data– Business Object Data

• DB Content Tools– SQL Insert Scripts– Schema or Table Exports/Dumps– Tool Specific Files (e.g. XML)

Version DB Content

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• DB Migration Tools– OR Mappers – built into the Application

• Rails: Active Records• Java: Flyway

– Evolutionary/Agile Database Tools • dbdeploy• DBmaestro

Version DB Changes

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Versioning Configuration Data1_create.sql

2_fill.sql

3_enable.sql

create

tables

indexes

...

views

functions

procedures

fill

system

configuration

business_objects

migrate

changelist_A

changelist_B

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Version Packages and Installers

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• OS Packages– Different for each Platform and Distribution– Multiple Repositories required– Packages and Metadata

• Installers– Simplify complicated installations– Same Installation on multiple Platforms– Manual Installations not supported

Version Packages and Installers

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• Puppet Package Resource:

• Ensure Attribute Values– present: Package is installed– latest: Package is upgraded to the latest available – ‘2.4.6’: specified Version of the Package is installed

Managing OS Packages

package {‘apache2’: ensure => present,}

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• New Package Versions are available online• Can we apply them automatically?

– Is the Package managed by Puppet?– Is the Package a Dependency of a Package managed

by Puppet?– Is there a Requirement for a particular Version of an

updated Package?– Is there a Requirement for a particular Version of a

Dependency of an updated Package?

Managing OS Upgrades

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• We need to know which is the latest Version of a Package in a certain Environment

• We need to create a local Repository and manage all Changes to it.

• On Ubuntu we use aptly to manage our local Repositories

Managing OS Upgrades

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Managing Repositories with aptly

Source: http://www.aptly.info/doc/overview/

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Managing Repositories with aptly

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• We check in the published Repository into Perforce to get full Traceability

• We can use Perforce to propagate Changes between Environments

• What do we use for Puppet ensure: • latest: Puppet actively tries to upgrade• present: Puppet trusts the Package Manger• ´2.4.6´: if we need to pin an older Version (apt::pin)

Managing Repositories with Perforce

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• We use a Perforce Stream to track the Work of an Installer in particular Directory

• This way can use a Task Stream to track the work of the Installer on each machine

• Currently we only use this Feature when we automate deployments

• The same concept can be used to tack changes of Directories on managed nodes

Version Installers

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• Developer Code• Deployment Code• Configuration Data• Database Structure• Database Content• Installable Software• Documentation

Version Everything for Deployments

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• Full Traceability• Code Reviews in Swarm for all Changes• Ability to make consistent changes across all

Artifacts• Revision Graph for Insights on a particular Artifact• Easy Tracking of the Work of Installers

Benefits of Versioning Everything

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Thank you!Christoph Leithnerc.leithner@celix.at