Guides

Rust (Rocket)

This example uses Rocket, a popular Rust web framework. To run this example, follow these steps:

1. Install the kraft CLI tool and a container runtime engine, e.g. Docker.

2. Clone the examples repository and cd into the examples/http-rust1.75-rocket0.5/ directory:

Code
 
git clone https://github.com/kraftcloud/examples
cd examples/http-rust1.75-rocket0.5

Make sure to log into Unikraft Cloud by setting your token and a metro close to you. We use fra0 (Frankfurt, 🇩🇪) in this guide:

Code
 
# Set Unikraft Cloud access token
export UKC_TOKEN=token
# Set metro to Frankfurt, DE
export UKC_METRO=fra0

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

Code
 
kraft cloud deploy -p 443:8080 .

The output shows the instance URL and other details:

Code
 
[●] Deployed successfully!
 │
 ├────────── name: http-rust175-rocket05-tuwq3
 ├────────── uuid: b6fe13e4-93b7-402b-bdec-1bc4d81bc275
 ├───────── state: running
 ├─────────── url: https://empty-bobo-n3htmpye.fra0.kraft.host
 ├───────── image: http-rust175-rocket05@sha256:23a7a6e155758e6e8f75e9570f0aec5fb744f08c1bad2454d7386367c5ea45d6
 ├───── boot time: 17.41 ms
 ├──────── memory: 128 MiB
 ├─────── service: empty-bobo-n3htmpye
 ├── private fqdn: http-rust175-rocket05-tuwq3.internal
 ├──── private ip: 172.16.6.6
 └────────── args: /server

In this case, the instance name is http-rust175-rocket05-tuwq3 and the URL is https://empty-bobo-n3htmpye.fra0.kraft.host. They are different for each run.

Use curl to query any of the Rocket server's paths, for example:

Code
 
curl https://empty-bobo-n3htmpye.fra0.kraft.host/wave/Rocketeer/100

Code
 
👋 Hello, 100 year old named Rocketeer!

At any point in time, you can list information about the instance:

Code
 
kraft cloud instance list

Code
 
NAME                           FQDN                           STATE    CREATED AT     IMAGE                                                                  MEMORY   ARGS     BOOT TIME
http-rust175-rocket05-tuwq3    empty-bobo-n3htmpye.fra0.k...  running  1 minute ago   http-rust175-rocket05@sha256:23a7a6e155758e6e8f75e9570f0aec5fb744...   128 MiB  /server  17412us

When done, you can remove the instance:

Code
 
kraft cloud instance remove http-rust175-rocket05-tuwq3

Customize your Application

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

• src/main.rs: the actual server
• Cargo.toml: the Cargo package manager configuration file
• Kraftfile: the Unikraft Cloud specification
• Dockerfile: the Docker-specified application filesystem

The following options are available for customizing the application:

• If only updating the implementation in the src/main.rs source file, no other change is required.

• If new files are added, these have to be copied in the application filesystem, using the COPY command in the Dockerfile. If new Rust source code files are added, be sure to configure required dependencies in the Cargo.toml file.

• If a new executable is built, update the cmd line in the Kraftfile and replace /server with the path to the new executable.

• More extensive changes may require expanding the Dockerfile with additional Dockerfile commands.

Learn More

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

Code
 
kraft cloud --help

Or visit the CLI Reference.