# C HTTP Server

import { Tabs, TabsContent, TabsList, TabsTrigger } from "zudoku/ui/Tabs"

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This guide explains how to create and deploy a C app.
To run this example, follow these steps:

1. Install the CLI.
   Use the [unikraft CLI](/cli/unikraft) or the legacy [kraft CLI](https://unikraft.org/docs/cli/install).
   You need a [BuildKit](https://github.com/moby/buildkit) builder. The easiest way to get one is via [Docker](https://docs.docker.com/engine/install/).
   Alternatively, you can also directly set up and use BuildKit, see the [quick start](https://github.com/moby/buildkit#quick-start).

   :::note
   The unikraft CLI is the current standard, while kraft is the legacy version.
   Choose one of the CLIs below and only run the commands associated with it for the rest of this guide.
   :::

2. Clone the [`examples` repository](https://github.com/unikraft-cloud/examples) and `cd` into the `examples/httpserver-gcc13.2` directory:

   ```bash
   git clone https://github.com/unikraft-cloud/examples
   cd examples/httpserver-gcc13.2/
   ```

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

<CodeTabs syncKey="cli">

```bash title="unikraft"
unikraft login
```

```bash title="kraft"
# Set Unikraft Cloud access token
export UKC_TOKEN=token
# Set metro to Frankfurt, DE
export UKC_METRO=fra
```

</CodeTabs>

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

<CodeTabs syncKey="cli">

```bash title="unikraft"
unikraft build . --output <my-org>/httpserver-gcc132:latest
unikraft run --metro fra \
  -m 256M \
  -p 443:8080/tls+http \
  --scale-to-zero policy=on,cooldown-time=1000 \
  --image <my-org>/httpserver-gcc132:latest
```

```bash title="kraft"
kraft cloud deploy \
  -M 256Mi \
  -p 443:8080/tls+http \
  --scale-to-zero on \
  --scale-to-zero-cooldown 1s \
  .
```

</CodeTabs>

The output shows the instance address and other details:

<CodeTabs syncKey="cli">

```ansi title="unikraft"
metro:        fra
name:         httpserver-gcc132-is2s9
uuid:         bec814ce-6ed5-4858-b247-e7f0b17750f5
state:        starting
image:        <my-org>/httpserver-gcc132
resources:
  memory:     256MiB
  vcpus:      1
service:
  uuid:       c36a4df6-b78d-677e-ea24-3e7a519a4130
  name:       still-resonance-bja3lste
  domains:
  - fqdn:     still-resonance-bja3lste.fra.unikraft.app
networks:
- uuid:       0f17e562-b57a-d40b-eecc-74e9058ecaaf
  private-ip: 10.0.0.49
  mac:        12:b0:10:70:49:2f
timestamps:
  created:    just now
```

```ansi title="kraft"
[●] Deployed successfully!
 │
 ├───────── name: httpserver-gcc132-is2s9
 ├───────── uuid: bec814ce-6ed5-4858-b247-e7f0b17750f5
 ├──────── metro: https://api.fra.unikraft.cloud/v1
 ├──────── state: starting
 ├─────── domain: https://still-resonance-bja3lste.fra.unikraft.app
 ├──────── image: oci://unikraft.io/<my-org>/httpserver-gcc132@sha256:375677bf052f14c18ca79c86d2f47a68f3ea5f8636bcd8830753a254f0e06c1b
 ├─────── memory: 256 MiB
 ├────── service: still-resonance-bja3lste
 ├─ private fqdn: httpserver-gcc132-is2s9.internal
 └─── private ip: 10.0.0.49
```

</CodeTabs>

In this case, the instance name is `httpserver-gcc132-is2s9` and the address is `https://still-resonance-bja3lste.fra.unikraft.app`.
They're different for each run.

Use `curl` to query the Unikraft Cloud instance:

```bash
curl https://still-resonance-bja3lste.fra.unikraft.app
```

```text
Hello, World!
```

You can list information about the instance by running:

<CodeTabs syncKey="cli">

```bash title="unikraft"
unikraft instances list
```

```bash title="kraft"
kraft cloud instance list
```

</CodeTabs>

<div style={{ marginTop: '0.8em' }} />

<CodeTabs syncKey="cli">

```ansi title="unikraft"
METRO  NAME                     STATE    IMAGE                       ARGS  MEMORY  VCPUS  FQDN                                    CREATED
fra    httpserver-gcc132-is2s9  standby  <my-org>/httpserver-gcc132        256MiB  1      still-resonance-bja3lste.fra.unikraft…  2 minutes ago
```

```ansi title="kraft"
NAME                     FQDN                                       STATE    STATUS   IMAGE                                                    MEMORY   VCPUS  ARGS  BOOT TIME
httpserver-gcc132-is2s9  still-resonance-bja3lste.fra.unikraft.app  standby  standby  oci://unikraft.io/<my-org>/httpserver-gcc132@sha256:...  256 MiB  1            12.91 ms
```

</CodeTabs>

When done, you can remove the instance:

<CodeTabs syncKey="cli">

```bash title="unikraft"
unikraft instances delete httpserver-gcc132-is2s9
```

```bash title="kraft"
kraft cloud instance remove httpserver-gcc132-is2s9
```

</CodeTabs>

## Learn more

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

<CodeTabs syncKey="cli">

```bash title="unikraft"
unikraft --help
```

```bash title="kraft"
kraft cloud --help
```

</CodeTabs>

Or visit the [CLI Reference](/cli/unikraft) or the [legacy CLI Reference](/cli/kraft/overview).
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