Continuous Delivery in Practice

Continuous
Delivery
InPractice

PatricFornasier
MarcHofer
SoftwareEngineer
ThoughtWorks・Springer・Yelp・Swisscom
♥ peopleandbuildingstuff
SoftwareEngineer
Zühlke・ThoughtWorks・effectiveAgile
♥ tolearnfrommistakes

Higher IT
performance
60x failures
168x recovery
30X deploys
200x leadtimes

Higher
organisational
performance
2x profitability
marketshare
productivity

Higher
throughput &
stability
11.6 secs
amazon-may2011

Our highest priority is to satisfy the customer
through early and continuous delivery of
valuable software.
‒ Agile Manifesto
“

time
plan
spec
design
code
test
deploy
iteration 1 iteration 2iteration ...

time
fall
plan
spec
test
deploy
SCRUM
ScrumWater

When I come in one day and tell you the
project will end in one week, you have to be
ready to package up and deliver what you’ve
got as the ﬁnal product.
‒ Tom DeMarco
IEEE Software, 2009
“

Continuous Delivery in Practice

IDEAS
CODEDATA
learn build
measure

change
time
change
time
big change
= big risk
small change
= small risk

Practices
Automation 
VersionControl 
ContinuousIntegration

Deployment
Pipeline
devtorelease

PROCESS
A
PROCESS
B
PROCESS
C
PROCESS
D
supplier customer
information flows
material flows

PROCESS
A
DEV RELEASE
PROCESS
D
supplier customer
information flows
material flows
continuous deluvery

How long would it take your organization to
deploy a change that involved just one single
line of code [...] on a repeatable, reliable
basis?
‒ Mary and Tom Poppendieck
Implementing Lean Software Development, 2006
“

Build
commit
Acc.
Tests
Staging Prod
automatic
promotion gated
verify
store
time

time
Build
Acc.
Tests
Staging Prod
component X
Build
Acc.
Tests
component Y
Sys.
Tests

http://arojgeorge.ghost.io/

time
Build
Acc.
Tests: n
Staging Prod
CDC
Tests
Sys.
Tests
Acc.
Tests: 1
Perf
Tests

70,000 tests
350 runs
700 days
3,000 concurrenttests
200 machines 
1.5M dockercontainers

time
Build
Acc.
Tests
Staging Prod
Build
Acc.
Tests
Staging Prod
Build
Acc.
Tests
Staging Prod
Build
Acc.
Tests
Staging Prod
Build
Acc.
Tests
Staging Prod#5
#4
#3
#2
#1

https://medium.com/continuous-delivery/architecting-for-continuous-delivery-77890e139ef6

VERSION 
CONTROL
TEST
SYSTEM
CONFIG
build
scripts
APP
CONFIGTOOLSgit
HG
...
DB
SCRIPTSCODE
DEPLOYMENT
SCRIPTS
DEPS
INFRA
CONFIG
DOCS
IDE
CONFIG
ENCRYPTED (!!)
SENSITIVE DATA

Continuous
Integration
...ismoreoftenthanyouthink.

develop
build
build
pull
push
time

build
pull
develop
build
push
pull
build
commit

BUILDAutomation
FAST
GATE TO
COmmit
AGREED
W/TEAM
FEEDBACK
TOOLS
MAKEBAZEL
GRADLERAKE ...
VERSION
CONTROLLED
COMMAND
LINE
SAME ON
CI
COMPILE
TESTS
PACKAGE
CHECKS
...

find bugs prevent bugs
MANUAL TESTS
AUTOMATION
SUITES
UNIT
# tests# tests confidence
FUNCTIONAL
SYS
INTEGRATION
UNIT
confidence

time
Unit
tests
int
tests
acc.
tests
trigger
feedback

infra &
environment
automation

1) inﬆall and boot new version
2) run health checks
3) route traﬀic
4) monitor
5) repeat
App B
App C
App A
App A'
routeLOAD
BALANCER/
DNS
inbound
traffic

Deployment!=Release 
…Experiment 
…DarkLaunching

Continuous Delivery in Practice

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