Linux command
htpdate 命令
安全
权限或系统影响较大，执行前请核对目标。
常用示例
Synchronize
sudo htpdate [host]
Example
htpdate -q [host]
Compensate
sudo htpdate -x [host]
Example
sudo htpdate -s [host]
说明
htpdate synchronizes the local system time using HTTP headers from web servers. It extracts the Date header from HTTP responses, providing time synchronization without dedicated NTP ports. This is useful in restricted network environments where: - NTP (port 123) is blocked by firewalls - Only HTTP/HTTPS traffic is allowed - Time synchronization is needed but NTP servers are inaccessible htpdate can query multiple servers and average the results for better accuracy. It supports both one-time synchronization and daemon mode for continuous adjustment.
参数
- -q
- Query only; don't set time
- -s
- Set time immediately (step)
- -x
- Adjust for systematic drift
- -a
- Adjust time gradually (slew)
- -d
- Run as daemon
- -l
- Use syslog for logging
- -t
- Turn off sanity time check
- -u _USER_
- Run as specified user
- -p _FILE_
- Create PID file
FAQ
What is the htpdate command used for?
htpdate synchronizes the local system time using HTTP headers from web servers. It extracts the Date header from HTTP responses, providing time synchronization without dedicated NTP ports. This is useful in restricted network environments where: - NTP (port 123) is blocked by firewalls - Only HTTP/HTTPS traffic is allowed - Time synchronization is needed but NTP servers are inaccessible htpdate can query multiple servers and average the results for better accuracy. It supports both one-time synchronization and daemon mode for continuous adjustment.
How do I run a basic htpdate example?
Run `sudo htpdate [host]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -q do in htpdate?
Query only; don't set time