Scrum like process2 week iterationUsers stories don’t always get completed in timeBut we still release on time, but with out incomplete work1 Binary for ….4 Significant product versions – API and UI Changes 5 Different database vendors – SQL compatible and Database Upgrade Multi Web browsers… IE7+
Pattern language for improving the process of Software DeliveryIts aims to produce Rapid, reliable and repeatable delivery of software with the minimal human intervention.It does this by leveraging existing techniques like Automated Testing, Continuous Integration and Continuous Deployment.CI Who’s already using CI?Why aren’t you using it? Don’t try Continuous DeploymentReliable and repeatable deployment of software to servers. These could be production QA staging serversCould be scripts for deploying to J2EE Containers
Continuous Delivery Book by Jez Humble and Dave FarleyThe core concept in the CD Pattern is the Deployment Pipeline.A series of “Stages” starting at creating your Artifact at the first stage and Releasing it in the final stage.Artifact is known as a release candidateThe stages in between are quality gates, is the Artifact good enough to be releasedWe don’t rebuild the artifact, we pass it. We will discuss this in a momentTypically constructed using Continuous Integration servers like Jenkins, Hudson, Bamboo or TeamCity. Each stage could be one or CI jobs joined to together to from the pipeline.Manual Break in the pipeline – QA Staging and manual approvalReleasing in case of a SAAS product would be deploying and rolling it out live to customers.You can define what release meansOur definition is the Artifact is made available to customers for downloading and customers are notified about the release.
Slows down the build 18 jobs – 17 minsDoes every machine produce the same artifact?Buggy compiler/JDKMaven global settings file can apply Maven profiles secretly
I should have reason to hate maven in this caseThe release Day headache was partly caused by MavenI had to find the correct commit within GIT that we wanted to releaseThen run the release plugin on it. This violated my earlier principle of rebuilding the Artifact
Lets get on with first goal
The SNAPSHOT extension gets converted into a timestamp when deploy to a Maven repo We can not convert a SNAPSHOT Artifact to RELEASE
Another Example of Snapshots can’t be usedThink about distributed build setupAnd concurrent executions of the pipeline – Next slide
Artifact build in the compile stage should be considered a “release” version in maven.
Release Plugin a stage two processRelease:prepareRelease:perform
Can’t use Release plugin – It redoes everythingWe don’t want to “tag” a version at the start of the pipeline, only at the end when all gates have been passedHow can we get a unique version number for our builds? Look at the rules for version numbers
CI systems expose a number of variables in our CI Jobs which we can access using variable subsuitationBETA1, BETA2Git SHA is not a good qualifierPrefer using Build number – What happens if someone triggers the pipeline manually?
This gives you a basic functional pipeline
Continuous Deployment Pipeline with maven
Continuous Deployment Pipeline with Maven Alan Parkinson @alan_parkinson
Summary• What is the Deployment Pipeline• How can we structure maven projects for it• The obstructions Maven causes• Solutions to these obstructions
The release day sumEvery 2 weeks… 1 Binary for …. 4 Significant product versions 5 Different database products Multi Web browsers… IE7+ Release day headache!
The Solution: Continuous Delivery• Eating our own dog food• List of available release ready candidates• One click delivery to customers• The Toolbox: – Continuous Integration (CI) – Automated Testing : Unit + Functional – Continuous Deployment
Why don’t we rebuild the Artifact? Source Code + Configuration + Build Environment = Artifact
Maven - Love it! or Hate it!People hate maven for several reasons…. Convention over Configuration == Opinionated
Fitting everything in a Maven Project• Each stage has a set of tests unit, integration, functional, performance, etc…• Developer Requirements for the build: – One Project – Sensible Default build – Anyone can run any test stage
Maven Project - Parent Library Multi Module Library Project is our Product friend…. tests database Each test stage integration gets its own module acceptance
Avoiding SnapshotsEach build needs a unique version number
Release Plugin – Part 1mvn release:prepare 1. Build 2. Update POM to release version 3. Commit and Tag release in SCM 4. Update POM to next snapshot version 5. Commit to SCM
Release Plugin – Part 2mvn release:perform 1. Checkout release tag from SCM 2. Build 3. Deploy
Maven headaches• Can’t use the Release plugin• Each build/release candidate should be release ready• Simulate the Release Plugin
Version number rules<Major [> . <Minor [> . <Inc ] ] > - <Build ]>188.8.131.52.0.0-451.0-45
Sources for the Build qualifier• What does your CI System Provide? – Build Numbers – SCM Revision Numbers• Value with natural ordering – Subversion revision is good – GIT SHA don’t help us• Combine values: r2964b45
Simulating a Release• Set a version without SNAPSHOT• Use the handy Versions PluginSetting the project version can be done from the command line