Musl rust

In this article I will present a Rust Dockerfile setup I am using for my rust projects. This focus means that we will require our tests to run and we try to take as much advantage of the docker build cache as possible to keep build times low. During the course of this article I will track 3 statistics, the final image sizethe initial build time and the time it takes to rebuild the project after a code change that does not affect the dependencies of the project.

All builds where done on my Core i5 and time was meassured with the linux time command, docker images sizes where taken from docker images. First lets create a standard hello world rust project, add a dependency and run it to verify that it works. If you do any local development you will generate rest products in the target directory when your are building and testing your project.

We should therefore setup a. Lets create a Dockerfile for this project.

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I want to utilize the musl libc implementation to get a statically compiled binary as that will simplify our deployment artifact quite a lot. If you can not or do not want to have a static binary as the output a lot of the techniques listed here are still applicable the way you construct your final image will need to be modified a bit.

The final binary has a size of roughly 5 megabytes so there is a big overhead in this native image, I will address this issue in the next section. Also the rebuild time indicates that we are actually not utilizing the docker cache at all and the build output from docker build. Let us address the size issue - we will utilize a feature introduced in Docker This allows us to define several Dockerfiles inside of a single Dockerfile and access data from the previous dockerfiles to construct our final image.

A side bonus of us building a static binary is that we can utilize a even smaller docker images as our final product.

musl rust

As we can see now the final docker image is several fractions smaller as we got rid of all build time dependencies as well as where able to utilize the scratch base image which is basically a empty docker image.

It should be noted that with this setup it is impossible for docker to produce a final image that does not pass the tests as the build will fail if our tests fails. So now we have a pretty nice setup that generates a very small docker image for us.

There are a couple of things that can be done to improve the process though. I will isolate each optimization to make it clearer what each step does before summarizing it all in a single dockerfile that utilizes all improvements at the same time.

Another thing we can do to get rid of some extra size of our final binary which now is the largest part of our docker image is to strip the binary of anything that is not needed to run it. Please be aware that this might not always be desired as it removes any debug information as well. Lets try to remedy that.

The trick here is to first add Cargo.

11. unsafe. Программирование на Rust (весна 2019).

Doing this will allow subsequent builds that does not change the dependencies to utilize the already cached steps in docker. When applying this strategy a couple of workarounds where needed. First Cargo will not build dependencies of a project that does not contain a main. Related to this we also need to touch our real main. This process could be improved if Cargo is given a command to allow installation of dependencies without the need for the source folder.Learning Rust has been on my personal backlog for a while now.

As I started digging in, I decided to build a small web application as an exercise. Once I had an initial version of the app working, I wanted to package it up as a docker image so that I could later deploy it to a Kubernetes cluster.

In the Go world, it is common to use docker's multi-stage build feature to produce the app's docker image in two stages. The first stage uses the golang image and is where we build the application into a statically-linked binary. Once built, we copy the binary into a scratch container in the second stage.

The result is a rather small image that has nothing other than the application. I was looking to do the same thing for my Rust application. While I was at it, I also wanted to leverage the docker build cache to avoid having to download crates on every docker build. After reading a couple of posts onlinethis is the Dockerfile that I ended up writing for my app:.

When it comes to building docker images, one of the best practices is to keep your images small. Furthermore, it reduces download times and disk usage. With the Dockerfile above, the resulting docker image is 4.

musl rust

That is a big difference. Did you find this post useful? Did I get something wrong? I would love to hear from you! Please reach out via alexbrand. Menu Close Subscribe. After reading a couple of posts onlinethis is the Dockerfile that I ended up writing for my app: Dockerfile for creating a statically-linked Rust application using docker's multi-stage build feature. This also leverages the docker build cache to avoid re-downloading dependencies if they have not changed.

FROM rust If the Cargo.The Rustup tool has become the recommended way to install Rust, and is advertised on our website. Its powers go further than that though, allowing you to manage various versions, components, and platforms.

This will install both rustup itself and the stable version of rustc and cargo. This will look at everything you've installed, and if there are new releases, will update anything that has one. If you'd like to have a different default per-directory, that's easy too! If you run this inside of a project:. Then when you're in that directory, any invocations of rustc or cargo will use that toolchain.

To share this with others, you can create a rust-toolchain file with the contents of a toolchain, and check it into source control. Now, when someone clones your project, they'll get the right version without needing to override set themselves. Rust supports cross-compiling to other targets, and Rustup can help you manage them. For example, to use MUSL:. Components are used to install certain kinds of tools. While cargo-install has you covered for most tools, some tools need deep integration into the compiler.

Rustup knows exactly what version of the compiler you're using, and so it's got just the information that these tools need. Components are per-toolchain, so if you want them to be available to more than one toolchain, you'll need to install them multiple times. In the following examples, add a --toolchain flag, set to the toolchain you want to install for, nightly for example.

Without this flag, it will install the component for the default toolchain. This first component is installed by default when you install a toolchain. It contains a copy of Rust's documentation, so that you can read it offline. This component cannot be removed for now; if that's of interest, please comment on this issue.

The rust-src component can give you a local copy of Rust's source code. Why might you need this? Well, autocompletion tools like Racer use this information to know more about the functions you're trying to call.

This will install two tools, rustfmt and cargo-fmtthat will reformat your code for you! For example:. Many IDE features are built off of the langserver protocol. For more, check out clippy's documentation.

There are several components in a "preview" stage. Please try them out and give us feedback, but know that they do not follow Rust's stability guarantees, and are still actively changing, possibly in backwards-incompatible ways. If you'd like to use the lld linker, or other tools like llvm-objdump or llvm-objcopyyou can install this component:.

Introduction 1. What are editions? Creating a new project 1. Transitioning an existing project to a new edition 2.

Rust 3. Module system 3.

Statically Linked Rust App

Raw identifiers 3.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to build static Rust executables with a customized version of musl. As a first step, I'm making myself familiar with Rust's build system. Digging through the build environment revealed that make all builds the Rust std library with musl but the subsequent make install step does not install it.

We have a temporary fix in the build. It is unclear whether that is an issue of the build environment or of its usage. The issue is known to the Rust developers. No eta of the fix, however.

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Learn more. How do I build the Rust standard library with a custom musl? Ask Question. Asked 3 years, 2 months ago. Active 3 years, 2 months ago. Viewed times. Progress: Digging through the build environment revealed that make all builds the Rust std library with musl but the subsequent make install step does not install it. Not exactly an answer to your question, but since all you want to do is to build a static executable might want to just check out github.

This image uses rustup to install a pre-compiled version of the rust std library compiled with musl which you can use then to statically compile rust applications. I want to build static rust applications with my customized version of musl. Active Oldest Votes. Sign up or log in Sign up using Google.

The Edition Guide

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow.

Dark Mode Beta - help us root out low-contrast and un-converted bits. Related 1. Hot Network Questions.By default, Rust will statically link all Rust code.

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However, if you use the standard library, it will dynamically link to the system's libc implementation. To add support for MUSL, you need to choose the correct target. The forge has a full list of targets supported, with a number of ones using musl. We'll be using this target in this guide, but the instructions remain the same for other targets, just change the name wherever we mention the target.

This will install support for the default toolchain; to install for other toolchains, add the --toolchain flag. For example:. Introduction 1. What are editions? Creating a new project 1.

Transitioning an existing project to a new edition 2. Rust 3. Module system 3. Raw identifiers 3. Path clarity 3. More visibility modifiers 3. Nested imports with use 3. Error handling and panics 3. Controlling panics with std::panic 3. Aborting on panic 3. Control flow 3. Loops can break with a value 3. Trait system 3.

More container types support trait objects 3.Maintained by : the Rust Project developers. Supported architectures : more info amd64arm32v7arm64v8i Rust is a systems programming language sponsored by Mozilla Research. It is designed to be a "safe, concurrent, practical language", supporting functional and imperative-procedural paradigms. The most straightforward way to use this image is to use a Rust container as both the build and runtime environment.

In your Dockerfilewriting something along the lines of the following will compile and run your project:. There may be occasions where it is not appropriate to run your app inside a container.

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To compile, but not run your app inside the Docker instance, you can write something like:. This will add your current directory, as a volume, to the container, set the working directory to the volume, and run the command cargo build --release. This is the defacto image. If you are unsure about what your needs are, you probably want to use this one.

It is designed to be used both as a throw away container mount your source code and start the container to start your appas well as the base to build other images off of.

Some of these tags may have names like buster or stretch in them. These are the suite code names for releases of Debian and indicate which release the image is based on. If your image needs to install any additional packages beyond what comes with the image, you'll likely want to specify one of these explicitly to minimize breakage when there are new releases of Debian.

The Edition Guide

This tag is based off of buildpack-deps. It, by design, has a large number of extremely common Debian packages. This reduces the number of packages that images that derive from it need to install, thus reducing the overall size of all images on your system. This image does not contain the common packages contained in the default tag and only contains the minimal packages needed to run rust.

Unless you are working in an environment where only the rust image will be deployed and you have space constraints, we highly recommend using the default image of this repository. This image is based on the popular Alpine Linux projectavailable in the alpine official image. This variant is highly recommended when final image size being as small as possible is desired. The main caveat to note is that it does use musl libc instead of glibc and friendsso certain software might run into issues depending on the depth of their libc requirements.

However, most software doesn't have an issue with this, so this variant is usually a very safe choice. To minimize image size, it's uncommon for additional related tools such as git or bash to be included in Alpine-based images. Using this image as a base, add the things you need in your own Dockerfile see the alpine image description for examples of how to install packages if you are unfamiliar.

View license information for the software contained in this image. As with all Docker images, these likely also contain other software which may be under other licenses such as Bash, etc from the base distribution, along with any direct or indirect dependencies of the primary software being contained.

As for any pre-built image usage, it is the image user's responsibility to ensure that any use of this image complies with any relevant licenses for all software contained within. Try the two-factor authentication beta. Docker Official Images. Rust is a systems programming language focused on safety, speed, and concurrency. Linux - ARM 64 latest.We finally got around to looking into this.

Since the announcement the end of November, Rust 1. Changes to the module system mean the previous example can be simplified. First, the original code:. Check github for a complete version of the updated example. Using musl is more involved on macOS as always.

The gist is using this brew script to install musl-cross-make :. You also need to a create a. Rust was born for this stuff!

musl rust

If you happen to operate between AWS regions, you might put more thought into region selection than you would otherwise. But between ap-northeast-1 Tokyoap-northeast-2 Seouland ap-southeast-1 Singapore? Less obvious. Problem is, it lacks the derth of runtime options:. It has even stricter limits than vanilla Lambda; limiting the size of payloads and rate of requests.

Went ahead and prodded the aws-lambda-rust-runtime projectbut was promptly rebuffed.

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Rust Since the announcement the end of November, Rust 1. Internal error occurred: Failed to find tool. Correct the errors below and try again. Runtime must be one of: Node.

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Your function's execution role must be assumable by the edgelambda.

Musl rust