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Example apps

DragonflyDB

This guide shows you how to deploy Dragonfly, a simple, performant, and cost-efficient in-memory data store.

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/dragonflydb/ directory:

   Code
   git clone https://github.com/unikraft-cloud/examples
   cd examples/dragonflydb/

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>/dragonflydb:latest
unikraft run --metro fra \
  -m 512M \
  -p 443:6379/http+tls \
  --scale-to-zero policy=off \
  --image <my-org>/dragonflydb:latest

The output shows the instance address and other details:

Code
metro:        fra
name:         dragonflydb-10zgk
uuid:         6282ef0c-2161-494c-a3f3-2d16055096c2
state:        starting
image:        <my-org>/dragonflydb
resources:
  memory:     512MiB
  vcpus:      1
service:
  uuid:       18326b44-a571-6195-b9e6-9368832ff2b3
  name:       dry-moon-x6bgl6c0
  domains:
  - fqdn:     dry-moon-x6bgl6c0.fra.unikraft.app
networks:
- uuid:       87aa7a40-2a83-f315-b656-e07a8637af64
  private-ip: 10.0.6.5
  mac:        12:b0:8f:c2:51:55
timestamps:
  created:    just now

In this case, the instance name is dragonflydb-10zgk and the address is https://dry-moon-x6bgl6c0.fra.unikraft.app. They're different for each run.

Use curl to query the Unikraft Cloud instance of Drangonfly.

Code
curl https://dry-moon-x6bgl6c0.fra.unikraft.app

Code
<!DOCTYPE html>
<html><head>
<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'/>
    <link href='https://fonts.googleapis.com/css?family=Roboto:400,300' rel='stylesheet'
     type='text/css'>
    <link rel='stylesheet' href='http://static.dragonflydb.io/data-plane/status_page.css'>
    <script type="text/javascript" src="http://static.dragonflydb.io/data-plane/status_page.js"></script>
</head>
<body>
<div><img src='http://static.dragonflydb.io/data-plane/logo.png' width="160"/></div>
<div class='left_panel'></div>
<div class='styled_border'>
<div>Status:<span class='key_text'>OK</span></div>
<div>Started on:<span class='key_text'>1970-01-01T00:00:00</span></div>
<div>Uptime:<span class='key_text'>474611:3:38</span></div>
<div>Render Latency:<span class='key_text'>110 us</span></div>
</div>
</body>
<script>
var json_text1 = {"engine": { "keys": 0,"obj_mem_usage": 0,"table_load_factor": 0 },
"current-time": 1708599818};
document.querySelector('.left_panel').innerHTML = JsonToHTML(json_text1);
</script>
</html>

You can list information about the instance by running:

Code
unikraft instances list

Code
METRO  NAME               STATE    IMAGE                 ARGS  MEMORY  VCPUS  FQDN                                CREATED
fra    dragonflydb-10zgk  running  <my-org>/dragonflydb        512MiB  1      dry-moon-x6bgl6c0.fra.unikraft.app  2 minutes ago

When done, you can remove the instance:

Code
unikraft instances delete dragonflydb-10zgk

Customize your app

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

• Kraftfile: the Unikraft Cloud specification, including command-line arguments
• Dockerfile: In case you need to add files to your instance's rootfs

Learn more

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

Code
unikraft --help

Or visit the CLI Reference.