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Example apps

Spring PetClinic

Spring PetClinic is an example project that uses Spring boot to model a simple pet clinic.

To run this example, follow these steps:

1. Install the unikraft CLI. You need a BuildKit builder. The easiest way to get one is via Docker. Alternatively, you can also directly set up and use BuildKit, see the quick start.

2. Clone the examples repository and cd into the examples/httpserver-java17-spring-petclinic/ directory:

   Code
   git clone https://github.com/unikraft-cloud/examples
   cd examples/httpserver-java17-spring-petclinic/

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

Code
unikraft login

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

Code
unikraft build . --output <my-org>/httpserver-java17-spring-petclinic:latest
unikraft run --metro fra \
  -m 1G \
  -p 443:8080/tls+http \
  --scale-to-zero policy=idle,cooldown-time=1000,stateful=true \
  --image <my-org>/httpserver-java17-spring-petclinic:latest

The output shows the instance address and other details:

Code
metro:        fra
name:         httpserver-java17-spring-petclinic-r4s3x
uuid:         5a3b7e2c-1f4d-4a8e-b6c9-2d3f8a1e7b4c
state:        starting
image:        <my-org>/httpserver-java17-spring-petclinic
resources:
  memory:     1024MiB
  vcpus:      1
service:
  uuid:       f4c2b1a0-3e5d-8b7a-9c6d-1e2f3a4b5c6d
  name:       bitter-dust-a7b2c3d4
  domains:
  - fqdn:     bitter-dust-a7b2c3d4.fra.unikraft.app
networks:
- uuid:       7d6e5f4a-3b2c-1d0e-9f8a-7b6c5d4e3f2a
  private-ip: 10.0.4.2
  mac:        12:b0:4a:1c:8f:73
timestamps:
  created:    just now

In this case, the instance name is httpserver-java17-spring-petclinic-r4s3x and the address is https://bitter-dust-a7b2c3d4.fra.unikraft.app. They're different for each run.

After deploying, point your browser to the provided URL.

You can list information about the instance by running:

Code
unikraft instances list

Code
METRO  NAME                                      STATE    IMAGE                                        ARGS  MEMORY   VCPUS  FQDN                                   CREATED
fra    httpserver-java17-spring-petclinic-r4s3x  running  <my-org>/httpserver-java17-spring-petclinic        1024MiB  1      bitter-dust-a7b2c3d4.fra.unikraft.app  2 minutes ago

When done, you can remove the instance:

Code
unikraft instances delete <instance-name>

Learn more

• Spring Boot Reference
• Unikraft Cloud's Documentation
• Building Dockerfile Images with Buildkit

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

Code
unikraft --help

Or visit the CLI Reference.