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linux_wiki:configure_a_system_to_use_time_services [2016/02/29 21:51] billdozor created |
linux_wiki:configure_a_system_to_use_time_services [2018/03/18 22:08] billdozor [Time Options] |
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| **General Information** | **General Information** | ||
| - | About this page/ | + | Managing time using different methods. |
| ---- | ---- | ||
| + | |||
| + | ===== Time Options ===== | ||
| + | |||
| + | * ntpd => the default in RHEL 5/6 | ||
| + | * chronyd => the default in RHEL 7 (ntpd can still be used instead) | ||
| + | * Chronyd has faster time sync than ntpd and can recover from network connection problems faster. | ||
| + | |||
| + | ---- | ||
| + | |||
| + | ===== Chrony ===== | ||
| Two new RHEL 7 tools: | Two new RHEL 7 tools: | ||
| Line 11: | Line 21: | ||
| * timedatectl - time and date settings information | * timedatectl - time and date settings information | ||
| + | \\ | ||
| View current detailed time information | View current detailed time information | ||
| <code bash> | <code bash> | ||
| Line 16: | Line 27: | ||
| </ | </ | ||
| + | \\ | ||
| View available timezones | View available timezones | ||
| <code bash> | <code bash> | ||
| Line 21: | Line 33: | ||
| </ | </ | ||
| + | \\ | ||
| Set timezone | Set timezone | ||
| <code bash> | <code bash> | ||
| Line 26: | Line 39: | ||
| </ | </ | ||
| + | \\ | ||
| Set system clock to 12:30pm and 10 seconds: | Set system clock to 12:30pm and 10 seconds: | ||
| <code bash> | <code bash> | ||
| Line 31: | Line 45: | ||
| </ | </ | ||
| + | \\ | ||
| Enable the use of NTP for time | Enable the use of NTP for time | ||
| <code bash> | <code bash> | ||
| Line 36: | Line 51: | ||
| </ | </ | ||
| + | \\ | ||
| NTP service config file (chronyd) | NTP service config file (chronyd) | ||
| * / | * / | ||
| + | \\ | ||
| NTP server entry examples in / | NTP server entry examples in / | ||
| <code bash> | <code bash> | ||
| Line 48: | Line 65: | ||
| * If you make any changes, chronyd service must be restarted | * If you make any changes, chronyd service must be restarted | ||
| + | \\ | ||
| Check status of NTP service, Restart it | Check status of NTP service, Restart it | ||
| <code bash> | <code bash> | ||
| Line 54: | Line 72: | ||
| </ | </ | ||
| + | \\ | ||
| View NTP sources | View NTP sources | ||
| <code bash> | <code bash> | ||