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有效解决CentOS8 AppStream报错以及makecache报错等问题
解决CentOS8 AppStream报错以及makecache报错等问题 使用CentOS 8 yum安装java11，遇到一系列问题。 Repository AppStream is listed more than once in the configuration Repository extras is listed more than once in the configuration Repository PowerTools is listed moreyum clean all &&yum makecache
[root@Fort ~]# yum clean all 已加载插件：fastestmirror 正在清理软件源： mirrors.163.com Cleaning up everything Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos Cleaning up list of fastest mirrorsLinux yum更换国内源
参考文章：Linux yum更换国内源 - mrma1989 - 博客园 备份 cd /etc/yum.repos.d/ mv CentOS-Base.repo CentOS-Base.repo_bak 2 网易yum源： wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo yum clean all yum makecache 3阿里yum makecache报错Error: Cannot retrieve repository metadata (repomd.xml)
yum makecache报错： Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Please verify its path and try again 解决办法： vim /etc/yum.repos.d/epel.repo 修改文件中的 [epel] 部分，把 enabled=1 改为 enabled=0 [epel] name=Extra PackagCentOS8更换yum源
cd /etc/yum.repos.d/ rm -f CentOS-Base.repo CentOS-AppStream.repo CentOS-PowerTools.repo CentOS-centosplus.repo CentOS-Extras.repo curl -o CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo yum makecacheyum切换源
备份 cd /etc/yum.repos.d/ mv CentOS-Base.repo CentOS-Base.repo_bak 2 网易yum源： wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo yum clean all yum makecache 3阿里云yum源： wget -O /etc/yum.repos.d/CentOS-Base.repoCentOS-7安装pip
首先需要安装epel-release拓展源 pip对应的python2.7 pip3ui应的python3.x yum -y install epel-release (1)随后，清空cache，并makecache yum clear all yum makecache (2)安装pip yum -y install python-pip (3)升级pip pip install --upgrade pipcentos7,yum安装工具报错
1.问题描述：yum安装gcc和其他的工具时一直报错： 2.问题解决： 网上看到有类似文章： No more mirrors to try. 得知这可能是错误的缓存源导致，直接两个命令解决： yum clean all（清理） yum makecache 补充： yum makecache就是把服务器的包信息下载到本地电脑缓存起来配合yum -C search xxx使