ARMv8架构下，docker模拟X86架构

ARMv8架构下，docker模拟X86架构

一、docker获取arm架构centos镜像，构建镜像

执行docker pull centos:7.9.2009 --platform=arm64，获取arm64架构版本centos7.9镜像

##拉取arm64架构版本centos7.9镜像
orangepi@orangepi5:~$ docker pull centos:7.9.2009 --platform=x86
Error response from daemon: "x86": unknown operating system or architecture: invalid argument
orangepi@orangepi5:~$ docker pull centos:7.9.2009 --platform=x86-64
7.9.2009: Pulling from library/centos
2d473b07cdd5: Pull complete 
Digest: sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4
Status: Downloaded newer image for centos:7.9.2009
docker.io/library/centos:7.9.2009

执行docker inspect centos:7.9.2009，查看镜像版本信息

orangepi@orangepi5:~$ docker inspect centos:7.9.2009
[{"Id": "sha256:eeb6ee3f44bd0b5103bb561b4c16bcb82328cfe5809ab675bb17ab3a16c517c9","RepoTags": ["centos:7.9.2009"],"RepoDigests": ["centos@sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4"],"Parent": "","Comment": "","Created": "2021-09-15T18:20:23.99863383Z","Container": "5e4c7bfd35862166e9efd7532208300600114f0acff8f82fd537a57bdd523fe2","ContainerConfig": {"Hostname": "5e4c7bfd3586","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": ["/bin/sh","-c","#(nop) ","CMD [\"/bin/bash\"]"],"Image": "sha256:ba35a4b787c8f11e3b6ed9248c7663b4f27459e9715a1ace09f966259d5ebc3a","Volumes": null,"WorkingDir": "","Entrypoint": null,"OnBuild": null,"Labels": {"org.label-schema.build-date": "20201113","org.label-schema.license": "GPLv2","org.label-schema.name": "CentOS Base Image","org.label-schema.schema-version": "1.0","org.label-schema.vendor": "CentOS","org.opencontainers.image.created": "2020-11-13 00:00:00+00:00","org.opencontainers.image.licenses": "GPL-2.0-only","org.opencontainers.image.title": "CentOS Base Image","org.opencontainers.image.vendor": "CentOS"}},"DockerVersion": "20.10.7","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": ["/bin/bash"],"Image": "sha256:ba35a4b787c8f11e3b6ed9248c7663b4f27459e9715a1ace09f966259d5ebc3a","Volumes": null,"WorkingDir": "","Entrypoint": null,"OnBuild": null,"Labels": {"org.label-schema.build-date": "20201113","org.label-schema.license": "GPLv2","org.label-schema.name": "CentOS Base Image","org.label-schema.schema-version": "1.0","org.label-schema.vendor": "CentOS","org.opencontainers.image.created": "2020-11-13 00:00:00+00:00","org.opencontainers.image.licenses": "GPL-2.0-only","org.opencontainers.image.title": "CentOS Base Image","org.opencontainers.image.vendor": "CentOS"}},"Architecture": "amd64","Os": "linux","Size": 203936249,"VirtualSize": 203936249,"GraphDriver": {"Data": {"MergedDir": "/var/lib/docker/overlay2/bec7f1a9a08e909d2c915524405b9c830ad31f85a054bff3f484e176e9d969ce/merged","UpperDir": "/var/lib/docker/overlay2/bec7f1a9a08e909d2c915524405b9c830ad31f85a054bff3f484e176e9d969ce/diff","WorkDir": "/var/lib/docker/overlay2/bec7f1a9a08e909d2c915524405b9c830ad31f85a054bff3f484e176e9d969ce/work"},"Name": "overlay2"},"RootFS": {"Type": "layers","Layers": ["sha256:174f5685490326fc0a1c0f5570b8663732189b327007e47ff13d2ca59673db02"]},"Metadata": {"LastTagTime": "0001-01-01T00:00:00Z"}}
]

二、安装QEMU

下载qemu-aarch64-static.tar.gz

#安装qemu-user-static
orangepi@orangepi5:~$ sudo apt-get install qemu binfmt-support qemu-user-static 

运行X86_64架构centos容器```shell
##查看当前docker内镜像信息
orangepi@orangepi5:~$ docker images
REPOSITORY                        TAG             IMAGE ID       CREATED         SIZE
hectormolinero/qemu-user-static   latest          6db061469b82   11 months ago   63.7MB
1995chen/dnf                      centos6-2.0.2   b3548d6b4cd3   14 months ago   1.2GB
centos                            7.9.2009        eeb6ee3f44bd   18 months ago   204MB
##运行X86架构centos，末尾eeb6ee3f44bd为容器ID
orangepi@orangepi5:~$ docker run -it -v /usr/bin/qemu-aarch64-static:/usr/bin/qemu-aarch64-static eeb6ee3f44bd
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
[root@f7c2b08e2825 /]# uname -m #运行后自动进入环境，检查架构可知为x86_64
x86_64
[root@f7c2b08e2825 /]# exit #退出虚拟环境
exit
orangepi@orangepi5:~$ uname -m
aarch64

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