需求

项目需要提供arm64架构上的centos7对应docker镜像，然后本地宿主机只有x86架构机器，因此需要在x86机器上构建centos arm64架构的docker镜像

环境

宿主机操作系统：centos7.7 amd64架构
docker版本：19.03.15

镜像构建

拉取arm64版本centos7

docker pull centos:7.9.2009 --platform=arm64# 通过命令查询镜像信息docker inspect centos:7.9.2009

ARM,AMD,X86,AArch64的概念可以参考：
https://blog.csdn.net/Bubbler_726/article/details/88397357

qemu配置

下载qemu-aarch64-static.tar.gz

# 下载wget https://github.com/multiarch/qemu-user-static/releases/download/v5.1.0-2/qemu-aarch64-static.tar.gz# 解压tar -zxvf qemu-aarch64-static.tar.gz# 移动到/usr/binmv qemu-aarch64-static /usr/bin#拉取qemu-user-static镜像docker pull multiarch/qemu-user-static:register

启动qemu

docker run --rm --privileged multiarch/qemu-user-static:register

运行arm容器

docker run -it -v /usr/bin/qemu-aarch64-static:/usr/bin/qemu-aarch64-static centosarm架构镜像id

启动成功后自动进入容器内

arm架构容器内安装软件

首先配置国内yum源

cp /etc/yum.repo.d{,.bak}  # 备份原有yum源文件rm -rf /etc/yum.repo.d/*  # 清空原有yum源文件cd /etc/yum.repo.dvim CentOS-Base.repo

添加如下内容，注意是阿里源，同时设置gpgcheck=0，默认是1，但是会报错，报错内容大概如下：

The GPG keys listed for the "CentOS-7 - Base" repository are already installed but they are not correct for this package.Check that the correct key URLs are configured for this repository.Failing package is: perl-threads-1.87-4.el7.aarch64GPG Keys are configured as: https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

取消gpgcheck验证避免该问题的出现，无论如何变更gpgkey地址，都是总会报错，因此直接设置gpgcheck=0更直接省事。

# CentOS-Base.repo## The mirror system uses the connecting IP address of the client and the# update status of each mirror to pick mirrors that are updated to and# geographically close to the client.  You should use this for CentOS updates# unless you are manually picking other mirrors.## If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead.##[base]name=CentOS-$releasever - Basebaseurl=https://mirrors.aliyun.com/centos-altarch/$releasever/os/$basearch/gpgcheck=0gpgkey=https://www.centos.org/keys/RPM-GPG-KEY-CentOS-7-aarch64#released updates [updates]name=CentOS-$releasever - Updatesbaseurl=https://mirrors.aliyun.com/centos-altarch/$releasever/updates/$basearch/gpgcheck=0gpgkey=https://www.centos.org/keys/RPM-GPG-KEY-CentOS-7-aarch64#additional packages that may be useful[extras]name=CentOS-$releasever - Extrasbaseurl=https://mirrors.aliyun.com/centos-altarch/$releasever/extras/$basearch/gpgcheck=0gpgkey=https://www.centos.org/keys/RPM-GPG-KEY-CentOS-7-aarch64enabled=1#additional packages that extend functionality of existing packages[centosplus]name=CentOS-$releasever - Plusbaseurl=https://mirrors.aliyun.com/centos-altarch/$releasever/centosplus/$basearch/gpgcheck=0enabled=0gpgkey=https://www.centos.org/keys/RPM-GPG-KEY-CentOS-7-aarch64

设置之后使用yum下载软件后打包镜像即可

打包容器为镜像

docker commit container_id centos-arm:7.9

更多docker commit命令参考 https://www.runoob.com/docker/docker-commit-command.html

x86架构上构建arm64架构的docker镜像