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[buildx] buildkit image support tencent cloud env 

Signed-off-by: Kang Huaishuai <khs1994@khs1994.com>
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Kang Huaishuai 2020-04-26 10:17:19 +08:00
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@ -14,10 +14,15 @@ $ docker run --rm --privileged docker/binfmt:820fdd95a9972a5308930a2bdfb8573dd44
由于 Docker 默认的 `builder` 实例不支持同时指定多个 `--platform`，我们必须首先创建一个新的 `builder` 实例。同时由于国内拉取镜像较缓慢，我们可以使用配置了 [镜像加速地址](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md) 的 [`dockerpracticesig/buildkit:master`](https://github.com/docker-practice/buildx) 镜像替换官方镜像。
> 如果你有私有的镜像加速器，可以基于 https://github.com/docker-practice/buildx 构建自己的 buildkit 镜像并使用它。
```bash
# 适用于国内环境
$ docker buildx create --use --name=mybuilder-cn --driver docker-container --driver-opt image=dockerpracticesig/buildkit:master
# 适用于腾讯云环境(腾讯云主机、coding.net 持续集成)
$ docker buildx create --use --name=mybuilder-cn --driver docker-container --driver-opt image=dockerpracticesig/buildkit:master-tencent
# $ docker buildx create --name mybuilder --driver docker-container
$ docker buildx use mybuilder