参考

​​buildx(github 安装QEMU文档)​​

​​build(Docker 官网文档)​​

​​QEMU(github安装文档)​​

构建多平台镜像

有3种方式：

  2. 使用QEMU模拟器。
  3. 使用原生的节点来构建，通过​​docker context​​命令来切换，连接不同的docker server。​​参考​​
  4. 通过使用​​--platform​​参数在Dockerfile里，来实现不同平台的镜像编译。(不知道是我不会用，还是不好用)

正文

开启 buildx

  • 编辑 /etc/docker/daemon.json，添加"experimental": true选项
    [root@]# cat /etc/docker/daemon.json { "experimental": true }
  • 重启 docker
    systemctl daemon-reload systemctl restart docker
  • 检测是否成功开启，true表示开启了
    [root@]# docker version -f '{{.Server.Experimental}}' true

安装QEMU

  • 安装
    [root@]# docker run --privileged --rm tonistiigi/binfmt --install all
  • 快速测试
    [root@]# docker run --rm arm64v8/alpine uname -a WARNING: The requested image's platform (linux/arm64) does not match the detected host platform (linux/amd64) and no specific platform was requested Linux 869e16c62dd8 5.10.18-amd64-desktop #1 SMP Mon Mar 1 17:09:41 CST 2021 aarch64 Linux

buildx构建amd和arm平台的两种镜像，并在各自的环境下使用

  • Dockerfile
    FROM ubuntu
  • 登录到docker，要推送镜像到 自己的 dockerhub 仓库
    [root@]# docker login
  • 添加一个 docker driver，会自动添加配置项，具体内部操作原因现在也还不清楚
    [root@]# docker buildx ls [root@]# docker buildx create --name my-buildx [root@]# docker buildx use my-buildx

上面几个命令的详细输出：

# 查看 buildx 的支持驱动
[root@]# docker buildx ls
NAME/NODE DRIVER/ENDPOINT STATUS  PLATFORMS
default * docker                  
  default default         running linux/amd64, linux/386, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/arm/v7, linux/arm/v6

# 创建driver，自定义名称 my-buildx
[root@]# docker buildx create --name my-buildx 
my-buildx

# 再次查看 drivers
[root@]# docker buildx ls
NAME/NODE    DRIVER/ENDPOINT  STATUS PLATFORMS
my-buildx    docker-container                     
  my-buildx0 unix:///var/run/docker.sock inactive 
default *    docker                   
  default    default          running linux/amd64, linux/386, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/arm/v7, linux/arm/v6

# 切换使用 my-buildx
[root@]# docker buildx use my-buildx

# 再次查看
[root@]# docker buildx ls
NAME/NODE    DRIVER/ENDPOINT  STATUS PLATFORMS
my-buildx    docker-container                     
  my-buildx0 unix:///var/run/docker.sock inactive 
default      docker                   
  default    default          running linux/amd64, linux/386, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/arm/v7, linux/arm/v6
  • 打镜像并推送
    # qiangge80800880 是我的用户名,镜像打完，并推送到docker hub [root@]# docker buildx build --platform linux/arm64,linux/amd64 -t qiangge80800880/ubuntu-arm-test:v1 . --push
  • 再次查看 buildx drivers
    [root@]# docker buildx ls

详细输出：

[root@]# docker buildx ls
NAME/NODE     DRIVER/ENDPOINT             STATUS PLATFORMS
my-buildx *  docker-container                    
  my-buildx0 unix:///var/run/docker.sock running linux/amd64, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/arm/v7, linux/arm/v6
default       docker                              
  default     default                     running linux/amd64, linux/386, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/arm/v7, linux/arm/v6
  • DockerHub可以看到有一个镜像tag有两个架构
    docker 使用QEMU，构建多平台镜像；docker buildx_unix

在 x86和arm平台使用此镜像测试

  • amd
    [root@]# uname -m x86_64 [root@]# docker run -it qiangge80800880/ubuntu-arm-test:v1 bash Unable to find image 'qiangge80800880/ubuntu-arm-test:v1' locally v1: Pulling from qiangge80800880/ubuntu-arm-test a70d879fa598: Pull complete c4394a92d1f8: Pull complete 10e6159c56c0: Pull complete Digest: sha256:a60e1f9dba411d8bf9c8f06147af7ea587cf539df082ce59cf63331761241cb2 Status: Downloaded newer image for qiangge80800880/ubuntu-arm-test:v1 root@0ddbf490e73b:/#
  • arm
    root@ks-allinone:~# uname -m aarch64 root@ks-allinone:~# docker run -it qiangge80800880/ubuntu-arm-test:v1 bash Unable to find image 'qiangge80800880/ubuntu-arm-test:v1' locally v1: Pulling from qiangge80800880/ubuntu-arm-test 2b20d1a80822: Pull complete f4e993c4ee9a: Pull complete c2befefc5146: Pull complete Digest: sha256:a60e1f9dba411d8bf9c8f06147af7ea587cf539df082ce59cf63331761241cb2 Status: Downloaded newer image for qiangge80800880/ubuntu-arm-test:v1 root@68b90968bcc7:/#

QEMU 卸载

docker run --privileged --rm tonistiigi/binfmt --uninstall qemu-aarch64

PS

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