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1. 查看buildx插件信息

比较新的docker-ce版本默认已经集成了buildx插件

[root@docker ~]# docker buildx version
github.com/docker/buildx v0.11.2 9872040
[root@docker ~]#

2. 增加多平台镜像构建支持

通过tonistiigi/binfmt:latest初始化一个基于容器的构建环境（依据官方说明）：

[root@docker ~]# docker run --privileged --rm tonistiigi/binfmt --install all
Unable to find image 'tonistiigi/binfmt:latest' locally
latest: Pulling from tonistiigi/binfmt
8d4d64c318a5: Pull complete
e9c608ddc3cb: Pull complete
Digest: sha256:66e11bea77a5ea9d6f0fe79b57cd2b189b5d15b93a2bdb925be22949232e4e55
Status: Downloaded newer image for tonistiigi/binfmt:latest
installing: mips64le OK
installing: mips64 OK
installing: ppc64le OK
installing: arm64 OK
installing: arm OK
installing: s390x OK
installing: riscv64 OK
{"supported": ["linux/amd64","linux/arm64","linux/riscv64","linux/ppc64le","linux/s390x","linux/386","linux/mips64le","linux/mips64","linux/arm/v7","linux/arm/v6"],"emulators": ["qemu-aarch64","qemu-arm","qemu-mips64","qemu-mips64el","qemu-ppc64le","qemu-riscv64","qemu-s390x"]
}
[root@docker ~]#

3. 创建构建器

构建器需要什么平台根据需要配置，这里只加了amd64和arm64：

# 创建名称为mybuilder的包含linux/amd64,linux/arm64架构的构建器
[root@docker ~]# docker buildx create --name=mybuilder --bootstrap --platform=linux/amd64,linux/arm64
[+] Building 4.3s (1/1) FINISHED=> [internal] booting buildkit                                                                                                                                     4.3s=> => pulling image moby/buildkit:buildx-stable-1                                                                                                                  3.7s=> => creating container buildx_buildkit_mybuilder0                                                                                                                0.6s
mybuilder
# 列出构建器
[root@docker ~]# docker buildx ls
NAME/NODE    DRIVER/ENDPOINT             STATUS  BUILDKIT             PLATFORMS
mybuilder    docker-containermybuilder0 unix:///var/run/docker.sock running v0.12.3              linux/amd64*, linux/arm64*, linux/amd64/v2, linux/amd64/v3, linux/amd64/v4, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/mips64le, linux/mips64, linux/arm/v7, linux/arm/v6
default *    dockerdefault    default                     running v0.11.6+616c3f613b54 linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/amd64/v4, linux/386, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/mips64le, linux/mips64, linux/arm/v7, linux/arm/v6
[root@docker ~]#

4. 设置当前构建器

默认构建器是自带的default，需要设置成我们创建的mybuilder：

[root@docker ~]# docker buildx use mybuilder
[root@docker ~]# docker buildx ls
NAME/NODE    DRIVER/ENDPOINT             STATUS  BUILDKIT             PLATFORMS
mybuilder *  docker-containermybuilder0 unix:///var/run/docker.sock running v0.12.3              linux/amd64*, linux/arm64*, linux/amd64/v2, linux/amd64/v3, linux/amd64/v4, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/mips64le, linux/mips64, linux/arm/v7, linux/arm/v6
default      dockerdefault    default                     running v0.11.6+616c3f613b54 linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/amd64/v4, linux/386, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/mips64le, linux/mips64, linux/arm/v7, linux/arm/v6
[root@docker ~]#

5. 构建并推送命令

构建镜像并推送到本地harbor仓库：

[root@docker ~]# docker buildx build \-t harbor.local/library/mysql:8.0.35 \--platform linux/amd64,linux/arm64 \--push

6. 从harbor查看镜像

可以看到多镜像的显示上多了一个类型目录的图标，可以点击查看不同架构情况：