Run a Rust Actix Web app
This example uses actix-web
, a popular Rust web framework.
To run this example, follow these steps:
-
Install the
kraft
CLI tool and a container runtime engine, e.g. Docker. -
Clone the
examples
repository andcd
into theexamples/http-rust1.75-actix-web4/
directory:
git clone https://github.com/kraftcloud/examplescd examples/http-rust1.75-actix-web4/
Make sure to log into Unikraft Cloud by setting your token and a metro close to you.
We use fra0
(Frankfurt, 🇩🇪) in this guide:
# Set Unikraft Cloud access tokenexport UKC_TOKEN=token# Set metro to Frankfurt, DEexport UKC_METRO=fra0
When done, invoke the following command to deploy this application on Unikraft Cloud:
kraft cloud deploy -p 443:8080 .
The output shows the instance URL and other details:
[●] Deployed successfully! │ ├────────── name: http-rust175-actix-web4-3pj27 ├────────── uuid:33e9b4ba-58d7-4b3a-b9dd-4c406c0e7b07 ├───────── state: running ├─────────── url: https://autumn-silence-wupu2nus.fra0.kraft.host ├───────── image: http-rust175-actix-web4@sha256:11723705230f0f4545d2be7e4867dc67b396870769e91f05e2fa6d9da94f9b59 ├───── boot time: 11.67 ms ├──────── memory: 128 MiB ├─────── service: autumn-silence-wupu2nus ├── private fqdn: http-rust175-actix-web4-3pj27.internal ├──── private ip: 172.16.3.3 └────────── args: /server
In this case, the instance name is http-rust175-actix-web4-3pj27
and the URL is https://autumn-silence-wupu2nus.fra0.kraft.host
.
They are different for each run.
Use curl
to query the Unikraft Cloud instance of the Rust-based HTTP web server:
curl https://autumn-silence-wupu2nus.fra0.kraft.hostcurl https://autumn-silence-wupu2nus.fra0.kraft.host/hey
Hello world!Hey there!
At any point in time, you can list information about the instance:
kraft cloud instance list
NAME FQDN STATE CREATED AT IMAGE MEMORY ARGS BOOT TIMEhttp-rust175-actix-web4-3pj27 autumn-silence-wupu2nus.fra0.kraft.host running 10 minutes ago http-rust175-actix-web4@sha256:11723705230f0f4545d2be7... 128 MiB /server 11672us
When done, you can remove the instance:
kraft cloud instance remove http-rust175-actix-web4-3pj27
Customize your Application
To customize the application, update the files in the repository, listed below:
src/main.rs
: the actual implementationCargo.toml
: the Cargo package manager configuration fileKraftfile
: the Unikraft Cloud specificationDockerfile
: the Docker-specified application filesystem
spec: v0.6
runtime: base:latest
rootfs: ./Dockerfile
cmd: ["/server"]
use actix_web::{get, post, web, App, HttpResponse, HttpServer, Responder};
#[get("/")]async fn hello() -> impl Responder { HttpResponse::Ok().body("Hello world!")}
#[post("/echo")]async fn echo(req_body: String) -> impl Responder { HttpResponse::Ok().body(req_body)}
async fn manual_hello() -> impl Responder { HttpResponse::Ok().body("Hey there!")}
#[actix_web::main]async fn main() -> std::io::Result<()> { HttpServer::new(|| { App::new() .service(hello) .service(echo) .route("/hey", web::get().to(manual_hello)) }) .bind(("0.0.0.0", 8080))? .run() .await}
[package]name = "hello"version = "0.0.0"edition = "2021"publish = false
[dependencies]actix-web = "4"
FROM rust:1.75.0-bookworm AS build
RUN cargo new --bin appWORKDIR /appCOPY Cargo.toml ./COPY src ./srcRUN cargo build --release
# This stage is optional but reduces overall image sizeFROM scratchCOPY --from=build /app/target/release/hello /serverCOPY --from=build /lib/x86_64-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/COPY --from=build /lib/x86_64-linux-gnu/libm.so.6 /lib/x86_64-linux-gnu/COPY --from=build /lib/x86_64-linux-gnu/libgcc_s.so.1 /lib/x86_64-linux-gnu/COPY --from=build /lib64/ld-linux-x86-64.so.2 /lib64/
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 theDockerfile
. If new Rust source code files are added, be sure to configure required dependencies in theCargo.toml
file. -
If a new executable is built, update the
cmd
line in theKraftfile
and replace/server
with the path to the new executable. -
More extensive changes may require expanding the
Dockerfile
with additionalDockerfile
commands.
Learn More
Use the --help
option for detailed information on using Unikraft Cloud:
kraft cloud --help
Or visit the CLI Reference.