This diagram shows the current changelog.com setup:
%% https://fontawesome.com/search
graph TD
classDef link stroke:#59b287,stroke-width:3px;
%% Code & assets
subgraph GitHub
repo{{ fab:fa-github thechangelog/changelog.com }}:::link
click repo "https://github.com/thechangelog/changelog.com"
cicd[/ fa:fa-circle-check GitHub Action - Ship It \]:::link
click cicd "https://github.com/thechangelog/changelog.com/actions/workflows/ship_it.yml"
automation[\ fab:fa-golang Dagger Go SDK /]:::link
click automation "https://github.com/thechangelog/changelog.com/blob/master/magefiles/magefiles.go"
registry(( fab:fa-github ghcr.io )):::link
click registry "https://github.com/orgs/thechangelog/packages"
chat(( fab:fa-slack Slack )):::link
click chat "https://changelog.slack.com/archives/C03SA8VE2"
repo -.-> |.github/workflows/ship_it.yml| cicd
cicd --> |magefiles/magefiles.go| automation
cicd --> |success #dev| chat
end
repo -.- |fly.io/changelog-2024-01-12| app
registry --> |ghcr.io/changelog/changelog-prod| app
dagger06 --> |flyctl deploy| app
repo -.- |fly.io/dagger-engine-2023-05-20| dagger06
repo -.- |fly.io/dagger-engine-2024-03-28| dagger010
repo -.- |fly.io/pghero-2024-03-27| pghero
%% PaaS - https://fly.io/dashboard/changelog
subgraph Fly.io
proxy{fa:fa-globe Proxy}
proxy ==> |https| app
dagger06([ fa:fa-project-diagram Dagger Engine v0.6 2023-05-20 ]):::link
click dagger06 "https://fly.io/apps/dagger-engine-2023-05-20"
dagger010([ fa:fa-project-diagram Dagger Engine v0.10 2024-03-28 ]):::link
click dagger010 "https://fly.io/apps/dagger-engine-2024-03-28"
app(( fab:fa-phoenix-framework App changelog-2024-01-12.fly.dev )):::link
style app fill:#488969;
click app "https://fly.io/apps/changelog-2024-01-12"
pghero([ fa:fa-gem PgHero 2024-03-27 ]):::link
click pghero "https://fly.io/apps/pghero-2024-03-27"
automation --> |wireguard| dagger06
dagger06 --> |ghcr.io/changelog/changelog-runtime| registry
dagger06 --> |ghcr.io/changelog/changelog-prod| registry
grafana[ fa:fa-columns Grafana fly-metrics.net ]:::link
click grafana "https://fly-metrics.net"
grafana -.- |metrics| app
grafana -.- |metrics| dagger06
grafana -.- |metrics| dagger010
grafana -.- |metrics| pghero
end
app <===> |Postgres| dbrw
pghero --> dbrw
subgraph Neon.tech
dbrw([ fa:fa-database main branch primary ]):::link
click dbrw "https://console.neon.tech/app/projects/orange-sound-86604986/branches/br-wandering-smoke-78468159"
dbro1([ fa:fa-database main branch replica ])
dbrw -.-> |replicate| dbro1
end
%% Secrets
secrets(( fa:fa-key 1Password )):::link
click secrets "https://changelog.1password.com/"
secrets -.-> |secrets| app
secrets -.-> |secrets| repo
%% Search
search(( fa:fa-magnifying-glass Typesense ))
app -..-> |search| search
%% Exceptions
exceptions(( fa:fa-car-crash Sentry )):::link
click exceptions "https://sentry.io/organizations/changelog-media/issues/?project=5668962"
app -..-> |exceptions| exceptions
%% CDN - https://manage.fastly.com/configure/services/7gKbcKSKGDyqU7IuDr43eG
subgraph Fastly
apex[ changelog.com ]:::link
click apex "https://changelog.com"
subgraph Ashburn
cdn[ cdn.changelog.com ]
end
end
subgraph AWS.S3
logs[ fab:fa-aws changelog-logs ]
end
apex & cdn-.-> |logs| logs
%% Observability
observability(( fa:fa-bug Honeycomb )):::link
click observability "https://ui.honeycomb.io/changelog/datasets/changelog_opentelemetry/home"
app -.-> |traces| observability
logs -.-> |logs| observability
%% Object storage
apex ==> |https| proxy
subgraph Cloudflare.R2
assets[ fab:fa-cloudflare changelog-assets changelog.place ]
feeds[ fab:fa-cloudflare changelog-feeds feeds.changelog.place ]
end
cdn ==> |https| assets & feeds
%% Monitoring
subgraph BetterStack
status[ fa:fa-layer-group status.changelog.com ]:::link
click status "https://status.changelog.com"
monitoring(( fa:fa-table-tennis Uptime )):::link
click monitoring "https://uptime.betterstack.com/team/133302/monitors"
monitoring -....-> |monitors| apex
monitoring -.-> |monitors| cdn
monitoring -.-> |monitors| proxy
monitoring -.-> |monitors| status
end
Let's dig into how all the above pieces fit together.
TL;DR:
- Front-end
- Fastly
- Fly.io Proxy
- Cloudflare R2
- Application
- Elixir / Phoenix
- Typesense search
- Database
- PostgreSQL (Neon.tech)
changelog.com is a monolithic Elixir application built with the Phoenix web framework. It uses PostgreSQL for persistence & Node.js to digest & compile static assets (CSS & JS).
Static assets, including all our mp3 episodes, are stored on Cloudflare R2. They are served via Fastly, specifically https://cdn.changelog.com.
Fastly (cdn.changelog.com)
↓
Cloudflare R2 (changelog.place)
The production instance of our application is running on Fly.io. All https://changelog.com requests are served via Fastly. Each Fastly request gets proxied to our application instance via the Fly.io Proxy.
Fastly (changelog.com)
↓
Fly.io Proxy
↓
Application (changelog-2024-01-12.fly.dev)
The production database - PostgreSQL - is running on Neon.tech. It is replicated setup, with one leader (RW) & one replica (RO). We are currently not using the replica, and since Neon.tech scales down to 0, this doesn't cost anything.
Application (changelog-2024-01-12.fly.dev)
↓
PostgreSQL Leader (RW)
↓
PostgreSQL Replica (RO)
Each commit made against our primary branch gets deployed straight into production. The "Ship It!" GitHub Actions workflow is responsible for this. From the workflow jobs perspective, it is fairly standard:
- 1/2. CI/CD
- Uses Dagger Go SDK so that it works exactly the same locally as it does in GitHub Actions
- Starts a Dagger Engine as a Fly.io machine on-demand, then connects to it so that caching is reliable & persistent across workflow runs
- A successful run publishes a container image to https://ghcr.io/thechangelog/changelog-runtime & https://ghcr.io/thechangelog/changelog-prod
- Deploys to Fly.io
- 2/2. Notify
- Notifies
#devchannel in changelog.slack.com if CI/CD succeeds
- Notifies
All our secrets are stored in 1Password, in
the changelog vault. We are declaring a single secret in Fly.io,
OP_SERVICE_ACCOUNT_TOKEN, and then loading all other secrets into memory part
of app boot via op & env.op.
In GitHub Actions secrets, we are still pasting them manually.
Note
We should use op here too.
Since our application & database are running on Fly.io, we benefit from free infrastructure metrics: https://fly-metrics.net
All logs from Fastly are streamed into Honeycomb.io. This allows us to ask unknown questions about how various HTTP clients interact with our content. It also helps us explore how Fastly interacts with Fly.io.
We also send app traces via OpenTelemetry to Honeycomb.io.
App errors - e.g. Plug.Conn.InvalidQueryError - show up in Sentry.io.
BetterStack.com monitors our public HTTPS endpoints & alerts us when they become unhealthy.
We use Typesense for search. It's near-instant & it just works.
The above is what we have so far. While we like to keep things simple, our setup is a constant work in progress. We keep making small improvements all the time, and we talk about them every few months in the context of our Ship It! Kaizen episodes.
For example, this diagram and document were created in the context of 🎧 Kaizen 8: 24 improvements & a lot more. If you would prefer to stay in reading mode, check out GitHub discussion #433.
If anything on this page is missing, or could be clearer, please open an issue. Thank you very much!
-
Start by creating a new app, e.g.
flyctl apps create changelog-2024-01-12 --org changelog -
Copy the existing app instance config, e.g.
cp -r fly.io/changelog-{2023-12-17,2024-01-12} -
Run all following commands in the app directory, e.g.
cd fly.io/changelog-2024-01-12 -
Update the app name in e.g.
fly.tomlto match the newly created app -
From within the app directory, set a few secrets required by the app to work correctly while testing
flyctl secrets set --stage \ OP_SERVICE_ACCOUNT_TOKEN="$(op read op://changelog/op/credential --account changelog.1password.com --cache)" \ R2_FEEDS_BUCKET=changelog-feeds-dev \ URL_HOST=changelog-2024-01-12.fly.dev -
Deploy the latest app image from https://github.com/thechangelog/changelog.com/pkgs/container/changelog-prod
flyctl deploy --vm-size performance-4x --image <LATEST_IMAGE_SHA>
See changelog/README.md.