故障现象：

ntpdate: no server suitable for synchronization found

解决办法:

~]# ntpdate -b -u pool.ntp.org

ntpdate命令帮助：

~]# man ntpdate

COMMAND LINE OPTIONS

       -b      Force the time to be stepped using the settimeofday() system call, rather than slewed (default) using the

               adjtime() system call. This option should be used when called from a startup file at boot time.

       -u      Direct  ntpdate to use an unprivileged port for outgoing packets. This is most useful when behind a fire-

               wall that blocks incoming traffic to privileged ports, and you want to synchronize with hosts beyond  the

               firewall. Note that the -d option always uses unprivileged ports.

ntpdate同步时间时错误: no server suitable for synchronization found