Source
GitHub → CodePipeline
Notices your push and takes a snapshot of the code.
- Your commit reaches GitHub
- GitHub tells AWS
- A copy of the code is saved
Produces SourceArtifact
From git push to production
CI/CD is the automation that carries a code change to real users: it builds it, tests it, deploys it and checks it works. Make a change, push it, and watch it happen.
1
Make a change
You are a developer on the ShortLink team. Pick what you are about to push.
Expected: everything passes and production gets the new version.
See the code change
src/routes/links.routes.js
+ router.delete('/bulk', async (req, res) => {
+ const deleted = await services.links.removeMany(req.body.codes)
+ res.json({ deleted })
+ })
Illustrative. This is the idea of the change, not a real file edit.
Advanced: break something in AWS
Real pipelines also fail for boring reasons: a missing permission, a stopped agent. Switch one on, then push.
2
Watch it travel to production
Each box is a stage in AWS CodePipeline. Nothing here is clicked by a person.
Continuous integrationbuild and test every change
Continuous deliveryship what was tested
The result
Not started
Build
AWS CodeBuild
Builds the code and runs the tests on a clean machine.
- Start a clean machine
- Fetch the code and tools
- Build and run the tests
- Package the result
Produces BuildArtifact.zip
Deploy
AWS CodeDeploy → EC2
Installs the tested package on the server, then checks it is healthy.
- Take the server out of the load balancer
- Install the new version
- Start it and check it works
- Put it back in the load balancer
Uses BuildArtifact.zip
Production
EC2 behind a load balancer
What your users actually reach.
Running version
a1b2c3dserved error (503)
Waiting for traffic…
Server details
3
Where it runs in AWS
The same run, drawn as the AWS services involved. Click any box to see what it is.
How to read this
A box lights up while it is doing work.
A label travelling along a line is data moving between services.
Click any box to see what it is and where to find it in the AWS console.
Status