CentOS6 官方很早就停止了维护，想用yum源，基本绕不过阿里，这里配置阿里云yum源，亲测真实有效...阅读全文

Cannot download repomd.xml:Cannot download repodata/repomd.xml...阅读全文

Another app is currently holding the yum lock; waiting for it to exit......阅读全文