47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
# docker-cmatrix
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A simple alpine-based docker image I used to teach me the basics of docker images and how to build them.
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## Build the container
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To build the container to an image called "cmatrix-demo", run
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```sh
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docker build -t cmatrix-demo .
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```
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## Multi-platform builds
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To do a build for multiple architectures, run:
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```sh
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sudo docker buildx create --name buildx-multi-arch
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sudo docker buildx use buildx-multi-arch
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```
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Then, to build it (e.g. for amd64 and arm64/v8):
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```sh
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sudo docker buildx build --no-cache --platform linux/amd64,linux/arm64/v8 -t cmatrix-demo .
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```
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**Please note that this will not load the images into the local image store (because it's obviously hard to run images built for the wrong architecture)! For uploading this to a container registry, see below.**
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## Pushing the container to a registry
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As you've got everything working, maybe it's time to share the work! This can be done by uploading the built image to a docker container registry, e.g. [Docker Hub](https://hub.docker.com/).
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First, sign into your Docker Hub account with your local docker installation (to create an account head to [https://app.docker.com/signup](https://app.docker.com/signup) in your favourite browser). The procedure is self-explaining:
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```sh
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docker login
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```
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To build and push the image directly to Docker Hub, use the following command (differs from the one above only in the --push option):
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```sh
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sudo docker buildx build --no-cache --platform linux/amd64,linux/arm64/v8 -t <USER>/cmatrix-demo . --push
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```
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