Continuous Integration Best Practices for Software Development Teams - AWS Online Tech Talks

© 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
Clare Liguori, AWS Senior Software Engineer
February 21, 2018
Continuous Integration Best
Practices for Software
Development Teams

Is the build broken again? I can’t even compile the app!
#TeamChat
Clare 9:48 am
Yeah me too, I guess someone pushed a bad change
Dave 9:50 am
Sorry, everyone, that was me. I’m still working on fixing it
Tim 11:01 am

Oh no, the last deployment to our test stack failed
#TeamChat
Dave 2:15 pm
Looks like the latest code causes a bunch of null pointer exceptions
Tim 2:16 pm
Why didn’t we catch this in code review?
Clare 2:17 pm

Is anyone else seeing test failures locally?
#TeamChat
Tim 4:39 pm
I think it started happening after I pulled Ian’s latest changes
Dave 4:39 pm
That’s weird, all the tests worked for me locally before I pushed the code
Clare 4:45 pm

Agenda
• Introduction to continuous integration
• Continuous integration tooling
• Three techniques
• Definition
• How to implement it
• What your team will say
• How to level-up
• Final thoughts

What is continuous integration?
1.Developers regularly check in code to a
shared, central repository
2.Automated checks run regularly against
the shared codebase
3.Developers get feedback from the
automated checks about their code
Developer
Shared
codebase
Automated
checks
Check in
code
Get
feedback
Run
checks

Why does continuous integration matter?
• Find bugs earlier
• Fix bugs faster
• Deliver faster
• Deliver more often
• Unblock developers
• Grow developers

• Fix bugs faster
• Deliver faster
• Grow developers
Quality:
5x
lower change
failure rate
Source: 2017 State of DevOps Report (Puppet)

• Fix bugs faster
• Deliver faster
• Grow developers
Delivery:
440x
faster from
commit to deploy

• Fix bugs faster
• Deliver faster
• Grow developers
Delivery:
46x
more frequent
deployments

• Fix bugs faster
• Deliver faster
• Grow skills faster
Happy teams:
44%
more time spent
on new features
and code

Sample application
Simple Calculator Service
10 2x
Submit
Your result is 20

Continuous integration tools
Check in
code
Get
feedback
Run
checks

Check in
code
Get
feedback
Run
checks
Source Code
• AWS CodeCommit
• GitHub

Check in
code
Get
feedback
Run
checks
Build &Test
• AWS CodeBuild

Developer
Shared
codebase
Automated
checks
Check in
code
Get
feedback
Run
checks
Glue
• AmazonCloudWatch Events

• Fully managed build service
• Continuous scaling
• Pay as you go
• Extensible
AWS CodeBuild

version: 0.2
phases:
install:
commands:
- npm install
build:
commands:
- npm test
artifacts:
files:
- '**/*'
AWS CodeBuild build spec

• Build source from Bitbucket and GitHub
Enterprise
• Add builds to GitHub Pull Requests
• Build inside your VPC
• Use secrets from Amazon Parameter Store
• Cache libraries in S3
AWS CodeBuild: What’s new

The continuous integration journey
Check in
code
Get
feedback
Run
checks

10 mph 65 mph 150 mph

Nightly
checks
Branch
checks
Pull request
checks

We have our release deadline coming up soon. Are we going to make it?
#TeamChat: No integration
Clare 9:48 am
Well, when’s the last time we did a full build?
Dave 9:50 am
Um, probably when we did the last release three months ago?
Tim 11:01 am

Technique #1: Nightly checks
1. Nightly checks
2. Branch checks
3. Pull request checks
Run a full build and
unit tests every
night to make sure
that application still
compiles and that
tests still pass.

Nightly checks: How to implement
CloudWatch
Event
Schedule
CodeBuild
Build
Trigger

1. Email notifications
2. Automate codebase maintenance
Nightly checks: Speed boosts

I can’t compile anything this morning
#TeamChat: Nightly checks failing
Clare 9:48 am
Oh, looks like last night’s build failed
Dave 9:50 am
Oh, looks like it’s been failing for a week actually…
Dave 11:01 am

Speed boost: Email notifications
CloudWatch
Event
CodeBuild
Build
Amazon
SES Email
SendNotify

When was the last time we upgraded our version of the ‘express’ library?
#TeamChat: Library upgrades
Clare 9:48 am
Ummm, I dunno
Tim 9:50 am
Maybe never?
Tim 11:01 am

"dependencies": {
"numeral": "^2.0.0",
"express": "^4.13.3"
}
Speed boost: Automate upgrades

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Speed boost: Automate upgrades

Nightly checks: Automate upgrades
CloudWatch
Event
Schedule
CodeBuild
Build
CodeCommit
Repository
Trigger Push
Upgrade

- rm npm-shrinkwrap.json
- npm install
- npm test
- npm shrinkwrap
- git add npm-shrinkwrap.json
- git commit –m “Update dependencies!”
- git push
Nightly checks: Automate upgrades

Nightly Checks: Update Libraries

I got the email that last night’s build failed
#TeamChat: Failing nightly checks
Clare 9:48 am
Yeah me too, I guess someone pushed a bad change
Tim 9:50 am
Sorry, everyone, that was me. I’m still working on fixing it
Dave 11:01 am

Nightly checks summary
Implement: Run a build every night at midnight
Feedback loop: 16-24 hours
Team impact: Broken code can block team for entire days
Speed boosts: Email notifications; Automate codebase maintenance

Technique #2: Branch checks
1. Nightly checks
2. Branch checks
3. Pull request checks
Run a full build and
unit tests every time
someone pushes a
new change to a
branch in the source
code repo.

Branch checks: AWS CodeCommit
CodeBuild
Build
CodeCommit
Repository
Team
Members
Push Notify Start
CloudWatch
Event

Branch Checks: CodeCommit Events

Branch checks: GitHub
CodeBuild
Build
GitHub
Repository
Team
Members
Start
Report
Push

Branch Checks: GitHub Webhooks

1. Slack notifications
2. Caching
Branch checks: Speed boosts

Tim: Dude, you broke the build
#TeamChat: Failing branch checks
Clare 9:48 am
I did? I pushed my last change hours ago though
Tim 9:50 am
Either the CI build just finished or we didn’t notice the failure…
Dave 11:01 am

Speed boost: Slack notifications
CodeBuild
Build
Notify
CloudWatch
Event
Post
Slack
Channel

Branch Checks: Slack Notifications

Continuous Integration Best Practices for Software Development Teams - AWS Online Tech Talks

Continuous Integration Best Practices for Software Development Teams - AWS Online Tech Talks

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