java tech & tools | continuous delivery - the writing is on the wall | john stevenson
DESCRIPTION
2011-11-01 | 10:40 AM - 11:40 AMSo you want to do continuous delivery but is it working and how does the team and the organisation know what's going on? Using wallboard, information radiators and even just bits of paper stuck to the wall can help you manage all your development.Covering the many ways companies have visualised the mashinations of their work and providing tips on setting up your own uber information radiators.TRANSCRIPT
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Continuous Deployment
The writing is on the wall
John StevensonLean Agile Machine
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Who is John Stevenson● Lean agile coach
Kanban, system thinking, ToC. ● Atlassian ambassador in UK
Growing communities around JIRA...● Community geek
London Java, Graduate Devs, London Scala, London Clojurians, etc.
● Dabbles with
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My Journey
● Started with RUP, UML & XP● Fell for Behaviour Driven
Development & kanban● Learn about a lot of Value &
Systems thinking● Coached teams & individuals● Sharing experiences with
community
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So what is Continuous Deployment ?
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...its incredibly hard
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...even if you are...
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...hard plus infinity for everyone else
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Continuous deployment example:
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Typically:
25 deploys per day
per developer
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Forward culture
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So why go for continuous
deployment?
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http://blog.thehigheredcio.com/2011/08/31/efficiency-vs-effectiveness/
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Understanding the business
Table stakes / foundations
SpoilersDifferentiators
Accelerators
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Benefits
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Where to get started ??
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Is your team / company ready ?
A case study in pain and dissapointment!
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Change can be expensive
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A long journey of discovery
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Involving the whole business
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Understanding of Value
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The right motivation
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What is the goal?
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Where to start ??
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Visualise how you do IT...
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Kanban – a wall of Facts
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Let the board show issues...
V1.0.1, V1.0.2, V1.0.3, V1.0.4,
Build 1209Build 1221Build 1301
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Value stream mapping
The (often wide) path to getting things done
Activities that get things done effectively
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Software development
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Software development
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Include the whole process...
Strategy to shiped
Budgeting
Business sign off
Deployment dry run
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Improve the foundations
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Monitoring your servers
● Nagios / NagVis● The Dude● Microsoft Operations Manager● Outsource IT...
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Sever Provisioning
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Its all virtual these days...
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Virtual Machines
Automate provisioning
Manage sys-admin tasks remotely
Spin up instances into the cloud Using public cloud when your private cloud is maxed out
Off the shelf pre-configured servers
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Managing VM's is easy
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Automating Virtual Machines
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Vagrant – simple to use
● Requirements Ruby Virtualbox Chef / Puppet for other VM systems
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Consistent environments
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Automated server managementPuppet / Chef / Rex
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Disaster recovery for learning
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Change freezes
The period of time when the most of the changes happen
When lots of patches are done !
A good time to learn what is important !
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Deployment Strategies
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If it hurts, do it more often
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Segmented deploys
Different customers / different expectations
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Timely deployments
Cost of delay ?
When is the software valuable ?
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Smaller deployments
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Visualise deployment strategies??
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Managing your code
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It compiles, ship it!!
Compile
Ship It
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Automated builds
Design around common patterns for building
Should have valuable reason for doing something different
SBT
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany.app</groupId>
<artifactId>my-app</artifactId> <packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>Maven Quick Start Archetype</name> <url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency> </dependencies>
</project>
Simple Maven config
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Local repositories
Nexus
Artefactory
DVCS
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Build tools – continuous feedback
Maven 3 Shell
Simple Build Tool
~Tests
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Coding fast feedback
JavaScript
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Testable code
● TDD / BDD helped devs have a better appreciation of code that is more testable
● Faster feedback gave devs (and team) better understanding of what is needed
● Resolve issues quickly, prevent many from happening at all
●
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Behaviour Driven Developent
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Deployable software
● Automated server builds● Automated deployment scripts / tools● Automated tests / specifications● Effective business review
● Faster feedback● Resolve issues quickly● Deploy when valuable
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Distributed Versioning
● Smaller repositories Per component / module Simpler architecture
● Manage branching easier with pull requests A pull system is more effective than central push
● Different repos for different purposes Repo for deployment, trunk, CI server
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Git Workflow
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Git architecure (logical)
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Change-set history
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Code reviews
DVCS push requests
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Central or
Distributed Version control
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Centralised team
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Centralised issues
Fear of breaking the build
unnecessary branching
delayed commits
Off-line support?
Any redundancy in versioning server?
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Managed Distributed team
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Continuous Integration
What
When
How long
Run specifications / unit tests
Reports
Actions to initiate
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CI Server basics
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BOfH CI Server
Kicks out checked in code if it fails
Wires up build bunnies to stop you hiding from broken builds
Wall of shame for breaking builds
Top ten worst programmers
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CI Server lights
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Ultimate Wallboards
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Issue ticker
Stream of issues flowing
Highlight new features, overdue items, critical issues, time related news, etc
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UltimateWallboard.com
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More than compiling code...
conf/tomcat-users.xml<user username=”bamboo” password=”bamboo” roles=”manager-script,manager-gui”/>
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One click deploy
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Architect for deployment
Modular systems
Simple interfaces
Supported by acceptance tests (specifications)
Automate low value tasks
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Final thoughts
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Predictability / Cadence
Smaller tasks
Understanding you capacity
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Communicate effectively
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Feedback
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How will you make a change ?
● Automated deployments● Distributed version control● Refactoring architecture, design & code● Modularity in design● Migrating from technical debt
● Shouting...
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Benefits
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Thank you
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Feedback & Refs
@JR0cket
Please note: Very few bulletpoints were hurt during the making of this presentation
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The big-ish picture
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SummaryAdaptable practices
TDD/BDD, DDD, kanban, ToC, system thinking
Good understanding of supporting tools Cucumber, CI build jobs, DVCS, ...
Strong DevOps capability
Understand business value
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A tool to collaborate
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Visualising the workload
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Pull system
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Experditing
● Visualisation for a high priority task Big red sticker Experditing lane Record other tasks being blocked
● Review why you get high priority task Consider it a constraint / bottleneck
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Experditing lane
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DevOps Goal keeper
● Team rotates people around role ● Goalkeeper fields all issues● Rest of team allowed to
focus on a (bigger) task● Use visual indicator to show
who is the Goalie
Visually represent these points ??
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Drop the Backlog
● The backlog is a omnipresent sign of overload
Useful for pushing back to the management
Bad for team moral Hide it away (eg. JIRA)
● When team are in tune with value, tasks flow more naturally – opportunities are not drowned out
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Data dashboard effect
● Manager can instantly see what you are working on
● Manager can evaluate priorities easily Or go back and ask for clarification with business
● Gives data on issues Recording task swapping, time to work on tasks Data to review at retrospective on current
approach
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Washing line
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RSPB
Royal Society for the protection of Bulletpoints
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Change at speed of deployment
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Be as creative as needed
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Managing the change
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Subtle ”Theory of Constraints”
● What is stopping you achieve your goals ? Identify all the current challenges
● Find how to work effectively With respect to the biggest challenge
● Incrementally improve around biggest challenge
● Review the challenges
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Change at the speed of acceptance
● Effective change cannot be pushed
● kanban estoles pull, change should be pulled
● Odd that some many agile projects start and end with a big bang
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Lean Startup
● Business canvas model● Real options● Last responsible moment● Least responsible change
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Lessons from Service Desk
● Variation of personal kanban Sticky notes at the side of the keyboard One priority at once Need business reason to change priorities
Record reason and number of times you had to revisit the task
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DevOps overload
● Lots of last minute patches
● Deployment like buses, nothing for a few days then three come at once for the same night
● DevOps have no time to script deployments
● Have to deal with long, boring deployment documents
● Repeatedly swiched from infrastructure work, vastly increasing time taken.
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Summary of Kanban
● Visualse work● Manage WIP● Engage with business
Shared ownership● Encourage realistic
priorities
● Helps you stay sane
● Show you are productive
● Deal with micro-management