树莓派（Raspberry Pi 3）安装centos7后yum无法使用解决办法

人穷，闲鱼淘了个二手的树莓派3 英国版，无奈咱也不会用，很无奈~

安装教程百度到的差不多都可以，找个格式正常的一步一步来就八九不离十

然后安装后想装个docker，就悲剧了，yum安装各种东西都超时

毕竟咱也是有阿里服务器的人呐，第一时间就想到弄个国内源就ok了嘛，然而并不行

各种百度依旧找不到原因（可能是因为我不会百度吧）

最终解决方案，参考树莓派centos7(armhf) yum源（中国科学技术大学）

建议看完再操作

# 1. 编辑CentOS-Base.repo

[root@centos-rpi3 ~]# vi /etc/yum.repos.d/CentOS-Base.repo

# 2. 不会用vi的朋友别乱动，可以按着d键不松手，即可清空整个文件

#    会的朋友直接清空它就行了

# 3. 复制下面的文字到这个文件中，使用putty的话就是在windows下复制，然后再putty中右键就可以粘贴

# 4. 按Esc，然后输入引号内的内容：“:wq”注意英文符号，随后会退出vi

# 5. 执行下面两句代码：

yum clean all

yum makecache

# 然后就大功告成了，还有问题欢迎评论区留言

就是复制下面这些东西：

# 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 - Base

#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os

baseurl=http://mirrors.ustc.edu.cn/centos-altarch/$releasever/os/$basearch/

gpgcheck=1

enabled=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32

#released updates

[updates]

name=CentOS-$releasever - Updates

# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates

baseurl=http://mirrors.ustc.edu.cn/centos-altarch/$releasever/updates/$basearch/

gpgcheck=1

enabled=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32

#additional packages that may be useful

[extras]

name=CentOS-$releasever - Extras

# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras

baseurl=http://mirrors.ustc.edu.cn/centos-altarch/$releasever/extras/$basearch/

gpgcheck=1

enabled=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32

#additional packages that extend functionality of existing packages

[centosplus]

name=CentOS-$releasever - Plus

# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus

baseurl=http://mirrors.ustc.edu.cn/centos-altarch/$releasever/centosplus/$basearch/

gpgcheck=1

enabled=0

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32

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