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docs: Update BUILDING.md

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Signed-off-by: Javier Maestro <jjmaestro@ieee.org>
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BUILDING.md
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@ -150,52 +150,33 @@ make STATIC=1
# Via Docker container # Via Docker container
The following instructions assume you are at the parent directory of containerd source directory. > [!NOTE]
> The following instructions assume you are at the **parent** directory of containerd source directory.
## Build containerd in a container ## Build containerd in a container
You can build `containerd` via a Linux-based Docker container. You can build `containerd` via a Linux-based Docker container using the [Docker official `golang` image](https://hub.docker.com/_/golang/)
You can build an image from this `Dockerfile`:
```dockerfile From the **parent** directory of `containerd`'s cloned repo you can run the following command:
FROM golang
```
Let's suppose that you built an image called `containerd/build`. From the
containerd source root directory you can run the following command:
```sh ```sh
docker run -it \ docker run -it \
-v ${PWD}/containerd:/go/src/github.com/containerd/containerd \ -v ${PWD}/containerd:/src/containerd \
-e GOPATH=/go \ -w /src/containerd golang
-w /go/src/github.com/containerd/containerd containerd/build sh
``` ```
This mounts `containerd` repository This mounts the `containerd` repository inside the image at `/src/containerd` and, by default, runs a shell at that directory.
You are now ready to [build](#build-containerd): Now, you are now ready to follow the [build instructions](#build-containerd):
```sh
make && make install
```
## Build containerd and runc in a container ## Build containerd and runc in a container
To have complete core container runtime, you will need both `containerd` and `runc`. It is possible to build both of these via Docker container. To have complete core container runtime, you will need both `containerd` and `runc`. It is possible to build both of these via Docker container.
You can use `git` to checkout `runc`: You can clone `runc` in the same parent directory where you cloned `containerd` and you should clone [the latest stable version of `runc`](https://github.com/opencontainers/runc/releases), e.g. v1.1.13:
```sh ```sh
git clone https://github.com/opencontainers/runc git clone --branch <RELEASE_TAG> https://github.com/opencontainers/runc
```
We can build an image from this `Dockerfile`:
```sh
FROM golang
RUN apt-get update && \
apt-get install -y libseccomp-dev
``` ```
In our Docker container we will build `runc` build, which includes In our Docker container we will build `runc` build, which includes
@ -206,36 +187,66 @@ do not require external libraries at build time). Refer to [RUNC.md](docs/RUNC.m
in the docs directory to for details about building runc, and to learn about in the docs directory to for details about building runc, and to learn about
supported versions of `runc` as used by containerd. supported versions of `runc` as used by containerd.
Let's suppose you build an image called `containerd/build` from the above Dockerfile. You can run the following command: Since we need [`libseccomp-dev`](https://packages.debian.org/stable/libseccomp-dev) installed as a dependency, we will need a custom Docker image derived from the official `golang` image. You can use the following `Dockerfile` to build your custom image:
```sh ```sh
docker run -it --privileged \ FROM golang
-v /var/lib/containerd \
-v ${PWD}/runc:/go/src/github.com/opencontainers/runc \ RUN apt-get update && \
-v ${PWD}/containerd:/go/src/github.com/containerd/containerd \ apt-get install -y libseccomp-dev
-e GOPATH=/go \ ```
-w /go/src/github.com/containerd/containerd containerd/build sh
Let's suppose you've built an image named `containerd/build` from the above `Dockerfile`.
You can run the following command:
```sh
docker run -it \
-v ${PWD}/containerd:/src/containerd \
-v ${PWD}/runc:/src/runc \
-w /src/containerd \
containerd/build
``` ```
This mounts both `runc` and `containerd` repositories in our Docker container. This mounts both `runc` and `containerd` repositories in our Docker container.
From within our Docker container let's build `containerd`: From within the Docker container, let's build `containerd`:
```sh ```sh
cd /go/src/github.com/containerd/containerd
make && make install make && make install
``` ```
These binaries can be found in the `./bin` directory in your host. You can check the installed binaries with:
`make install` will move the binaries in your `$PATH`.
```sh
$ which containerd
/usr/local/bin/containerd
$ containerd --version
containerd github.com/containerd/containerd/v2 v2.0.0-rc.3-195-gf5d5407c2 f5d5407c2ff12865653a9a132d5783196be82763
```
Next, let's build `runc`: Next, let's build `runc`:
```sh ```sh
cd /go/src/github.com/opencontainers/runc cd /src/runc
make && make install make && make install
``` ```
You can check the installed binaries with:
```sh
$ which runc
/usr/local/sbin/runc
$ runc --version
runc version 1.1.13
commit: v1.1.13-0-g58aa9203
spec: 1.0.2-dev
go: go1.23.0
libseccomp: 2.5.4
```
For further details about building runc, refer to [RUNC.md](docs/RUNC.md) in the For further details about building runc, refer to [RUNC.md](docs/RUNC.md) in the
docs directory. docs directory.