Kamal 2 finally brings the most requested feature to reality and allows people to run multiple applications simultaneously on a single server. Here’

Running multiple apps on a single server with Kamal 2

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2024-10-07 11:30:07

Kamal 2 finally brings the most requested feature to reality and allows people to run multiple applications simultaneously on a single server. Here’s how.

Kamal is an application-centric deploy tool rather than a small PaaS. And this hasn’t changed with the new version 2. But what does it even mean?

As you can notice the configuration describes only one particular service. And this hasn’t changed. Applications still have their own configuration. The only thing that changed is the possibility to share their servers.

Kamal 2 adds support for multiple apps with the new Kamal Proxy. The new proxy registers new deployments for services and handles their gapless switchover.

The only thing Kamal Proxy needs to know is the host (domain) of the service so it can route the traffic to the service web containers. This is done with the following Kamal configuration:

Let’s say we want to deploy three different application on the same server for a local dealership. The main app, API server, and their marketing website. Then we need three different configurations, one for each app.