使用vmware server创建的虚拟机会有时间不同步的情况，如果是windows的虚拟系统，可以通过安装vmware tools后在控制面板设置好便可以定时同步。如果是linux的虚拟系统，通过编辑vmx文件，添加或修改对应的选项：
tools.syncTime = TRUE
time.synchronize.continue = TRUE
time.synchronize.restore = TRUE
time.synchronize.resume.disk = TRUE
time.synchronize.shrink = TRUE
time.synchronize.tools.startup = TRUE
解释如下：
| Option | Effect |
| tools.syncTime | If set to TRUE, the clock syncs periodically. |
| time.synchronize.continue | If set to TRUE, the clock syncs after taking a snapshot. |
| time.synchronize.restore | If set to TRUE, the clock syncs after reverting to a snapshot. |
| time.synchronize.resume.disk | If set to TRUE, the clock syncs after resuming from suspend and after migrating to a new host using the VMware VMotion feature. |
| time.synchronize.shrink | If set to TRUE, the clock syncs after defragmenting a virtual disk. |
| time.synchronize.tools.startup | If set to TRUE, the clock syncs when the tools daemon starts up, normally while the guest operating system is booting. |
参考自：www.vmware.com/pdf/vmware_timekeeping.pdf