Docker多平台架构镜像构建

# 教程

>w 请注意 docker 版本必须 ≥19.03

## ~1.开启实验性支持(有些是开启就不需要第2步了,但大部分不行.....哈哈哈)~

参考:<https://github.com/docker/docker-ce/blob/master/components/cli/experimental/README.md>

~```~
~# vim /etc/docker/daemon.json~
~{
    "experimental": true
}~
~```~

## 2.安装 docker-buildx

参考:<https://github.com/docker/buildx/blob/master/README.md#installing>

```bash
# 可能不是最新版了,最新版请去上方链接里的指引去下载.
mkdir -p ~/.docker/cli-plugins
wget -O ~/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/v0.9.1/buildx-v0.9.1.linux-amd64
chmod a+x ~/.docker/cli-plugins/docker-buildx
# 验证
docker-buildx version
```

2022.9.25补充新的方式，根据官方文档。在以下目录，已经存在 `docker-buildx` 文件了。
```bash
/usr/local/lib/docker/cli-plugins OR /usr/local/libexec/docker/cli-plugins
/usr/lib/docker/cli-plugins OR /usr/libexec/docker/cli-plugins
```

只需软连接或者手动拷贝到 `~/.docker/cli-plugins/` 目录并赋权即可。

## 3.开启多架构支持

```bash
# arm64平台需要这一步,amd可忽略
docker buildx create --name multiarch --driver docker-container --use
# 安装qemu
docker run --privileged --rm tonistiigi/binfmt --install all
# 构建镜像
docker buildx build  --platform linux/amd64,linux/arm64,linux/arm/v7 -t jonnyan404/verysync . --push
```

# Reference Link
- <https://github.com/tonistiigi/binfmt#installing-emulators>
- <https://docs.docker.com/buildx/working-with-buildx/>
- <https://forums.docker.com/t/error-multiple-platforms-feature-is-currently-not-supported-for-docker-driver/124811/11>