Jenkins 定期构建 - 时间表
Jenkins Build Periodically - Schedule
我希望每 15 分钟定期构建一次。我在网上看过并且正在使用这个时间表：*/15 * * * *
Jenkins 告诉我使用 H/15 * * * * 而不是 */15 * * * *
来平均分配负载
谁能告诉我使用 H 而不是 * 的区别？
是的。从Build Triggers → 定期构建 → Schedule → 内联帮助：
To allow periodically scheduled tasks to produce even load on the system, the symbol H (for “hash”) should be used wherever possible. For example, using 0 0 * * * for a dozen daily jobs will cause a large spike at midnight. In contrast, using H H * * * would still execute each job once a day, but not all at the same time, better using limited resources.
The H symbol can be used with a range. For example, H H(0-7) * * * means some time between 12:00 AM (midnight) to 7:59 AM. You can also use step intervals with H, with or without ranges.
The H symbol can be thought of as a random value over a range, but it actually is a hash of the job name, not a random function, so that the value remains stable for any given project.
Beware that for the day of month field, short cycles such as */3 or H/3 will not work consistently near the end of most months, due to variable month lengths. For example, */3 will run on the 1st, 4th, …31st days of a long month, then again the next day of the next month. Hashes are always chosen in the 1-28 range, so H/3 will produce a gap between runs of between 3 and 6 days at the end of a month. (Longer cycles will also have inconsistent lengths but the effect may be relatively less noticeable.)
Empty lines and lines that start with # will be ignored as comments.
In addition, @yearly, @annually, @monthly, @weekly, @daily, @midnight, and @hourly are supported as convenient aliases. These use the hash system for automatic balancing. For example, @hourly is the same as H * * * * and could mean at any time during the hour. @midnight actually means some time between 12:00 AM and 2:59 AM.
Examples:
# every fifteen minutes (perhaps at :07, :22, :37, :52)
H/15 * * * *
# every ten minutes in the first half of every hour (three times, perhaps at :04, :14, :24)
H(0-29)/10 * * * *
# once every two hours every weekday (perhaps at 10:38 AM, 12:38 PM, 2:38 PM, 4:38 PM)
H 9-16/2 * * 1-5
# once a day on the 1st and 15th of every month except December
H H 1,15 1-11 *
我希望每 15 分钟定期构建一次。我在网上看过并且正在使用这个时间表：*/15 * * * *
Jenkins 告诉我使用 H/15 * * * * 而不是 */15 * * * *
谁能告诉我使用 H 而不是 * 的区别？
是的。从Build Triggers → 定期构建 → Schedule →
To allow periodically scheduled tasks to produce even load on the system, the symbol H (for “hash”) should be used wherever possible. For example, using
0 0 * * *for a dozen daily jobs will cause a large spike at midnight. In contrast, usingH H * * *would still execute each job once a day, but not all at the same time, better using limited resources.The H symbol can be used with a range. For example,
H H(0-7) * * *means some time between 12:00 AM (midnight) to 7:59 AM. You can also use step intervals withH, with or without ranges.The
Hsymbol can be thought of as a random value over a range, but it actually is a hash of the job name, not a random function, so that the value remains stable for any given project.Beware that for the day of month field, short cycles such as
*/3orH/3will not work consistently near the end of most months, due to variable month lengths. For example,*/3will run on the 1st, 4th, …31st days of a long month, then again the next day of the next month. Hashes are always chosen in the 1-28 range, soH/3will produce a gap between runs of between 3 and 6 days at the end of a month. (Longer cycles will also have inconsistent lengths but the effect may be relatively less noticeable.)Empty lines and lines that start with
#will be ignored as comments.In addition,
@yearly,@annually,@monthly,@weekly,@daily,@midnight, and@hourlyare supported as convenient aliases. These use the hash system for automatic balancing. For example,@hourlyis the same asH * * * *and could mean at any time during the hour.@midnightactually means some time between 12:00 AM and 2:59 AM.Examples:
# every fifteen minutes (perhaps at :07, :22, :37, :52) H/15 * * * * # every ten minutes in the first half of every hour (three times, perhaps at :04, :14, :24) H(0-29)/10 * * * * # once every two hours every weekday (perhaps at 10:38 AM, 12:38 PM, 2:38 PM, 4:38 PM) H 9-16/2 * * 1-5 # once a day on the 1st and 15th of every month except December H H 1,15 1-11 *