CentOS使用yum安装时报错：File contains no section headers. file: file:///etc/yum.repos.d/katacontainers.

# 删除yum.repos.d目录下所有文件
rm -f /etc/yum.repos.d/*
# 重新下载阿里的资源。注意，参数是大写的英文字母O
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
# 清除缓存
yum clean all