今天来升级一个centos6.X 到 centos7
先添加源
vim /etc/yum.repos.d/upgrade.repo
[upgrade] name=upgrade baseurl=http://dev.centos.org/centos/6/upg/x86_64/ enable=1 gpgcheck=0
网上的些文章会直接进行升级，遇到报错如下
Assessment finished (time 05:57s) I/O warning : failed to load external entity "/usr/share/openscap/xsl/security-guide.xsl" compilation error: file /usr/share/preupgrade/xsl/preup.xsl line 40 element import xsl:import : unable to load /usr/share/openscap/xsl/security-guide.xsl I/O warning : failed to load external entity "/usr/share/openscap/xsl/oval-report.xsl" compilation error: file /usr/share/preupgrade/xsl/preup.xsl line 41 element import xsl:import : unable to load /usr/share/openscap/xsl/oval-report.xsl I/O warning : failed to load external entity "/usr/share/openscap/xsl/sce-report.xsl" compilation error: file /usr/share/preupgrade/xsl/preup.xsl line 42 element import xsl:import : unable to load /usr/share/openscap/xsl/sce-report.xsl OpenSCAP Error:: Could not parse XSLT file '/usr/share/preupgrade/xsl/preup.xsl' [oscapxml.c:416] Unable to open file /root/preupgrade/result.html Usage: preupg [options] preupg: error: [Errno 2] No such file or directory: '/root/preupgrade/result.html'
解决方法，先执行下面命令
yum erase openscap yum install http://dev.centos.org/centos/6/upg/x86_64/Packages/openscap-1.0.8-1.0.1.el6.centos.x86_64.rpm yum -y install redhat-upgrade-tool preupgrade-assistant-contents
再进行升级。
yum -y install preupgrade-assistant-contents redhat-upgrade-tool preupgrade-assistant
preupg -l preupg -s CentOS6_7
这里官方源7最新版本，好像升级不成功，使用官方备份源的旧版本，然后执行升级！
centos-upgrade-tool-cli --network 7 --instrepo=http://vault.centos.org/centos/7.2.1511/os/x86_64/
接下来就是等着了