CentOS 6.10升级至CentOS 7.x遇多类报错，求技术解决方案

Let's work through your two key issues one by one: the broken preupg tool caused by missing OpenSCAP XSL files, and the failed CentOS 7 GPG key imports.

1. Resolve preupg's Missing XSL File Errors #

Your logs show preupg can't load critical XSL files from /usr/share/openscap/xsl/—this usually happens when OpenSCAP packages are missing, corrupted, or the preupgrade assistant isn't properly linked to them.

Step-by-Step Fix: #

• First, check if OpenSCAP packages are installed:

  rpm -qa | grep openscap
  

• If openscap and openscap-scanner don't show up in the output, install them:

  yum install openscap openscap-scanner
  

• If the packages are already present, reinstall them to fix corrupted files:

  yum reinstall openscap openscap-scanner
  

• Also, ensure the preupgrade-assistant package is intact:

  yum reinstall preupgrade-assistant
  

• After completing these steps, run preupg again to verify the issue is fixed.

2. Fix CentOS 7 GPG Key Import Failures #

The URLs you used to import the GPG key are outdated (returning 404 errors). Here's how to get and import the valid key:

Step-by-Step Fix: #

• Option 1: Use the local GPG key file (if you have CentOS 7 media or repositories set up):

  rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
  

• Option 2: Download the valid key directly and import it:

  # Download the official key
  curl -O https://www.centos.org/keys/RPM-GPG-KEY-CentOS-7
  # Import the downloaded key
  rpm --import RPM-GPG-KEY-CentOS-7
  

Your Original Error Logs for Reference: #

I/O警告：无法加载外部实体 "/usr/share/openscap/xsl/security-guide.xsl"
编译错误：文件/usr/share/preupgrade/xsl/preup.xsl第40行元素import，xsl:import无法加载/usr/share/openscap/xsl/security-guide.xsl
I/O警告：无法加载外部实体 "/usr/share/openscap/xsl/oval-report.xsl"
编译错误：文件/usr/share/preupgrade/xsl/preup.xsl第41行元素import，xsl:import无法加载/usr/share/openscap/xsl/oval-report.xsl
I/O警告：无法加载外部实体 "/usr/share/openscap/xsl/sce-report.xsl"
编译错误：文件/usr/share/preupgrade/xsl/preup.xsl第42行元素import，xsl:import无法加载/usr/share/openscap/xsl/sce-report.xsl
OpenSCAP错误：无法解析XSLT文件'/usr/share/preupgrade/xsl/preup.xsl' [oscapxml.c:416]
无法打开文件/root/preupgrade/result.html
用法：preupg [选项]
preupg:错误：[Errno 2] 没有那个文件或目录: '/root/preupgrade/result.html'
[root@localhost upgrade]# yum localinstall redhat-upgrade-tool-0.7.22-3.el6.centos.noarch.rpm
无法设置区域设置，默认使用C
已加载插件：fastestmirror
设置本地包处理进程
检查redhat-upgrade-tool-0.7.22-3.el6.centos.noarch.rpm: 1:redhat-upgrade-tool-0.7.22-3.el6.centos.noarch
redhat-upgrade-tool-0.7.22-3.el6.centos.noarch.rpm：不更新已安装的包。无事可做
[root@localhost upgrade]# rpm --import http://ftp.plusline.de/centos/7.0.1406/os/x86_64/RPM-GPG-KEY-CentOS-7
curl: (22) 请求的URL返回错误: 404 Not Found
错误：http://ftp.plusline.de/centos/7.0.1406/os/x86_64/RPM-GPG-KEY-CentOS-7 : 导入读取失败(2)。
[root@localhost upgrade]# 
[root@localhost upgrade]# rpm --import http://isoredirect.centos.org/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7
curl: (22) 请求的URL返回错误: 404 Not Found
错误：http://isoredirect.centos.org/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7 : 导入读取失败(2)。

内容的提问来源于stack exchange，提问作者Ersel Bey