当遇到KVM安装错误'Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory'时,可以尝试执行以下步骤解决:1. 执行yum upgrade device-mapper-libs升级相关库;2. 安装avahi:yum -y install avahi;3. 重启messagebus服务:/etc/init.d/messagebus restart;4. 重启avahi-daemon服务:/etc/init.d/avahi-daemon restart;5. 重启libvirtd服务:/etc/init.d/libvirtd restart。