docker buildx跨架构构建笔记(x86

docker buildx跨架构构建(x86_64构建aarch64镜像)

文章目录

docker buildx跨架构构建(x86_64构建aarch64镜像)简介第一步 先交叉编译一个aarch64的HelloWorld程序。准备一个用于跨架构的Dockerfile文件使用docker buildx命令构建aarch64架构的镜像。查看镜像具体详细信息（确定镜像是ARM架构）测试（通过）小技巧（避免每次下载aarch64架构的基础镜像）

简介

Docker Buildx 是 Docker 团队为 Docker 引擎设计的一个工具，用于支持构建和管理多平台的容器镜像。它扩展了 Docker 构建工具，使得可以跨多个不同的架构和操作系统进行构建。

第一步 先交叉编译一个aarch64的HelloWorld程序。

准备一个用于跨架构的Dockerfile文件

vi Dockerfile

FROM ubuntu:20.04

COPY main /app/main

WORKDIR /app

CMD ["/app/main"]

使用docker buildx命令构建aarch64架构的镜像。

docker buildx build --platform linux/arm64 -t test:0.1 --load .

# root @ liuyuelong-System-Product-Name in ~/workspace/cross_test/src/main on git:master x [17:28:46]

$ docker buildx build --platform linux/arm64 -t aarch64_images:1.0 --load .

[+] Building 3.4s (9/9) FINISHED docker-container:elegant_davinci

=> [internal] load build definition from Dockerfile 0.0s

=> => transferring dockerfile: 111B 0.0s

=> [internal] load .dockerignore 0.0s

=> => transferring context: 2B 0.0s

=> [internal] load metadata for docker.io/library/ubuntu:20.04 2.8s

=> [internal] load build context 0.0s

=> => transferring context: 14.27kB 0.0s

=> CACHED [1/3] FROM docker.io/library/ubuntu:20.04@sha256:ed4a42283d9943135ed87d4ee34e542f7f5ad9ecf2f244870e23122f703f91c2 0.0s

=> => resolve docker.io/library/ubuntu:20.04@sha256:ed4a42283d9943135ed87d4ee34e542f7f5ad9ecf2f244870e23122f703f91c2 0.0s

=> [2/3] COPY main /app/main 0.0s

=> [3/3] WORKDIR /app 0.0s

=> exporting to oci image format 0.3s

=> => exporting layers 0.2s

=> => exporting manifest sha256:9354e37bfcc69a2408f10323d76afaa40e96fb04f5ef6260d23ca6f17ec86dad 0.0s

=> => exporting config sha256:a858b4c183e0ebdc2e8b217c5557e1f3fb3aebc3df98a0f8cfd5b68673005052 0.0s

=> => sending tarball 0.1s

=> importing to docker 0.0s

# root @ liuyuelong-System-Product-Name in ~/workspace/cross_test/src/main on git:master x [17:31:22]

$ docker images | grep aarch64_images

aarch64_images 1.0 a858b4c183e0 43 seconds ago 65.7MB

查看镜像具体详细信息（确定镜像是ARM架构）

# root @ liuyuelong-System-Product-Name in ~/workspace/cross_test/src/main on git:master x [17:32:10]

$ docker inspect aarch64_images:1.0

[

{

"Id": "sha256:a858b4c183e0ebdc2e8b217c5557e1f3fb3aebc3df98a0f8cfd5b68673005052",

"RepoTags": [

"aarch64_images:1.0"

],

"RepoDigests": [],

"Parent": "",

"Comment": "buildkit.dockerfile.v0",

"Created": "2023-11-30T09:31:22.44138137Z",

"Container": "",

"ContainerConfig": {

"Hostname": "",

"Domainname": "",

"User": "",

"AttachStdin": false,

"AttachStdout": false,

"AttachStderr": false,

"Tty": false,

"OpenStdin": false,

"StdinOnce": false,

"Env": null,

"Cmd": null,

"Image": "",

"Volumes": null,

"WorkingDir": "",

"Entrypoint": null,

"OnBuild": null,

"Labels": null

},

"DockerVersion": "",

"Author": "",

"Config": {

"Hostname": "",

"Domainname": "",

"User": "",

"AttachStdin": false,

"AttachStdout": false,

"AttachStderr": false,

"Tty": false,

"OpenStdin": false,

"StdinOnce": false,

"Env": [

"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

],

"Cmd": [

"/app/main"

],

"ArgsEscaped": true,

"Image": "",

"Volumes": null,

"WorkingDir": "/app",

"Entrypoint": null,

"OnBuild": null,

"Labels": {

"org.opencontainers.image.ref.name": "ubuntu",

"org.opencontainers.image.version": "20.04"

}

},

"Architecture": "arm64",

"Os": "linux",

"Size": 65692279,

"VirtualSize": 65692279,

"GraphDriver": {

"Data": {

"LowerDir": "/var/lib/docker/overlay2/31cdebbee3d9a5cb5222804c1ca5759ce9d9dacc1aa94c9ff5317fe13989aca1/diff",

"MergedDir": "/var/lib/docker/overlay2/6c1bad2064ca4947f86e3a9438c25e7c926cb7d4d65c3cececcd0ce7236ec3cc/merged",

"UpperDir": "/var/lib/docker/overlay2/6c1bad2064ca4947f86e3a9438c25e7c926cb7d4d65c3cececcd0ce7236ec3cc/diff",

"WorkDir": "/var/lib/docker/overlay2/6c1bad2064ca4947f86e3a9438c25e7c926cb7d4d65c3cececcd0ce7236ec3cc/work"

},

"Name": "overlay2"

},

"RootFS": {

"Type": "layers",

"Layers": [

"sha256:701ccb11c0525a289459678e1ef3e9269b62737fafb033db91061ae53a0e9c1e",

"sha256:2ebde9a9a90f240d14d223cb6d6ac61e209f0e871973ceb6c421b3b0569c09d8"

]

},

"Metadata": {

"LastTagTime": "0001-01-01T00:00:00Z"

}

}

]

"Architecture": "arm64", 架构没有问题

测试（通过）

导出镜像 docker save aarch64_images:1.0 -o aarch64_images.img 在aarch64架构下安装镜像 docker load -i aarch64_images.img 运行测试

# docker run --rm aarch64_images:1.0

Hello World!

测试通过

小技巧（避免每次下载aarch64架构的基础镜像）

docker buildx create --use create => Create a new builder instance 创建一个新的构造器实例 –use => Set the current builder instance 使用创建的构建器实例作为当前的构造器

创建实例后，如果使用的话，构造器就会被激活，并以容器的形式运行，在这个容器中，在构建过程中下载的基础镜像会被保存在容器中，再次构建，不需要重新下载基础镜像。

也可以使用命令管理构造器

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