Guides

Skipper

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This example uses Skipper, an HTTP router and reverse proxy for service composition

To run this example, follow these steps:

1. Install the kraft CLI tool and a container runtime engine, for example Docker.

2. Clone the examples repository and cd into the examples/skipper/ directory:

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git clone https://github.com/kraftcloud/examples
cd examples/skipper/

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

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# Set Unikraft Cloud access token
export UKC_TOKEN=token
# Set metro to Frankfurt, DE
export UKC_METRO=fra

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

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kraft cloud deploy -p 443:9090 .

The output shows the instance address and other details:

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[●] Deployed successfully!
 │
 ├────────── name: skipper-mx4ai
 ├────────── uuid: 34e3d740-c2b0-4644-b7e1-647350f688dc
 ├───────── state: running
 ├─────────── url: https://aged-sea-o7d3c42s.fra.unikraft.app
 ├───────── image: skipper@sha256:5483eaf3612cca2116ceaab9be42557686324f1d30337ae15d0495eef63d0386
 ├───── boot time: 43.71 ms
 ├──────── memory: 128 MiB
 ├─────── service: aged-sea-o7d3c42s
 ├── private fqdn: skipper-mx4ai.internal
 ├──── private ip: 172.16.6.4
 └────────── args: /usr/bin/skipper -address :9090 -routes-file /etc/skipper/example.eskip

In this case, the instance name is skipper-mx4ai and the address is https://aged-sea-o7d3c42s.fra.unikraft.app. They're different for each run.

Use curl to query the Unikraft Cloud instance of Skipper.

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curl https://aged-sea-o7d3c42s.fra.unikraft.app

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Hello, world from Skipper on Unikraft!

You can list information about the instance by running:

Code
 
kraft cloud instance list

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NAME              FQDN                                    STATE    CREATED AT     IMAGE                      MEMORY   ARGS                                           BOOT TIME
skipper-mx4ai     aged-sea-o7d3c42s.fra.unikraft.app      running  1 minute ago   skipper@sha256:5483eaf...  128 MiB  /usr/bin/skipper -address :9090 -routes-f...   43709us

When done, you can remove the instance:

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kraft cloud instance remove skipper-mx4ai

Customize your app

To customize Skipper you can change the example.eskip configuration file.

Learn more

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

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kraft cloud --help

Or visit the CLI Reference.