hwclock: Open of /dev/rtc failed, errno=19: No such device.

今早一台服务器故障，后来有空上来查看故障日志，未果，发现时间不对，如下：

[root@cache06 ~]# hwclock -w

Cannot access the Hardware Clock via any known method.

Use the --debug option to see the details of our search for an access method.

[root@cache06 ~]# hwclock --debug

hwclock from util-linux-2.13-pre7

hwclock: Open of /dev/rtc failed, errno=19: No such device.

No usable clock interface found.

[root@cache06 ~]# ls -l /dev/rtc

rtc   rtc0 

通过查找资料发现是因为升级内核是没有加载相应的时间模块导致，可用升级hwclock的方式解决，于是如下：

wget http://ftp.sjtu.edu.cn/sites/ftp.kernel.org/pub/linux/utils/util-linux-ng/v2.18/util-linux-ng-2.18.tar.gz

tar xzvf util-linux-ng-2.18.tar.gz

cd util-linux-ng-2.18

./configure