CentOS7使用yum时File contains no section headers.
file: file:///etc/yum.repos.d/CentOS-Base.repo, line: 1
'--2024-09-22 21:08:17-- http://mirrors.aliyun.com/repo/Centos-7.repo\n'

安装好CenOS7后，自带的yum不能直接使用，使用会出现如下问题：

原因是没有配置yum源，修改/etc/yum.repos.d/CenOS-Base.repo文件内容如下：

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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=$basearch&repo=os&infra=$infra

baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/

gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

released updates

[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra

baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/

gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

additional packages that may be useful

[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra

baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/

gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

additional packages that extend functionality of existing packages

[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra

baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/

gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
编辑命令如下：

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vi /etc/yum.repos.d/CentOS-Base.repo
保存命令

按ESC键 跳到命令模式，然后：

 

:w   保存文件但不退出vi

:w file 将修改另外保存到file中，不退出vi

:w!   强制保存，不推出vi

:wq  保存文件并退出vi

:wq! 强制保存文件，并退出vi

q:  不保存文件，退出vi

:q! 不保存文件，强制退出vi

:e! 放弃所有修改，从上次保存文件开始再编辑

或者先删除原有的文件

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rm -f /etc/yum.repos.d/CentOS-Base.repo
然后重新下载阿里的

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wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
清理缓存

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yum clean all

ps:如果上述方法没有解决，尝试下面：

删除yum.repos.d目录下所有文件

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rm -f /etc/yum.repos.d/*
然后重新下载阿里的

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wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

清理缓存

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yum clean all

测试下载安装

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yum install gcc

结果如下：