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Guides

Ruby HTTP Server

This guide explains how to create and deploy a simple Ruby-based HTTP web server. To run this example, follow these steps:

1. Install the CLI and a container runtime engine, for example Docker. Use the unikraft CLI or the legacy kraft CLI.

2. Clone the examples repository and cd into the examples/httpserver-ruby3.2/ directory:

Code
git clone https://github.com/unikraft-cloud/examples
cd examples/httpserver-ruby3.2/

Make sure to log into Unikraft Cloud and pick a metro close to you. This guide uses fra (Frankfurt, 🇩🇪):

When done, invoke the following command to deploy this app on Unikraft Cloud:

The output shows the instance address and other details:

Code
[●] Deployed successfully!
 │
 ├────────── name: httpserver-ruby32-s6l8n
 ├────────── uuid: b1ebbbc0-5efa-476c-adb6-99866773245c
 ├───────── state: running
 ├─────────── url: https://silent-resonance-1jtz5c66.fra.unikraft.app
 ├───────── image: httpserver-ruby32@sha256:4cf3b341898e6ebff18ff2b68353ef872dded650c9d16a6f005a8fbe8a7cbb3d
 ├───── boot time: 71.19 ms
 ├──────── memory: 256 MiB
 ├─────── service: silent-resonance-1jtz5c66
 ├── private fqdn: httpserver-ruby32-s6l8n.internal
 ├──── private ip: 172.16.3.3
 └────────── args: /usr/bin/ruby /src/server.rb

In this case, the instance name is httpserver-ruby32-s6l8n and the address is https://silent-resonance-1jtz5c66.fra.unikraft.app. They're different for each run.

Use curl to query the Unikraft Cloud instance of the Ruby-based HTTP web server:

Code
curl https://silent-resonance-1jtz5c66.fra.unikraft.app

Code
Hello, World!

You can list information about the instance by running:

Code
NAME                     FQDN                                        STATE    STATUS          IMAGE                                                 MEMORY   VCPUS  ARGS                          BOOT TIME
httpserver-ruby32-s6l8n  silent-resonance-1jtz5c66.fra.unikraft.app  running  12 minutes ago  httpserver-ruby32@sha256:4cf3b341898e6ff2b68353ef...  256 MiB  1      /usr/bin/ruby /src/server.rb  71191us

When done, you can remove the instance:

Customize your app

To customize the app, update the files in the repository, listed below:

• server.rb: the actual Ruby HTTP server
• Kraftfile: the Unikraft Cloud specification
• Dockerfile: the Docker-specified app filesystem

The following options are available for customizing the app:

• If you only update the implementation in the server.rb source file, you don't need to make any other changes.

• If you create any new source files, copy them into the app filesystem by using the COPY command in the Dockerfile.

• More extensive changes may require extending the Dockerfile (see Dockerfile syntax reference).

Learn more

Use the --help option for detailed information on using Unikraft Cloud:

Or visit the CLI Reference or the legacy CLI Reference.