Jenkins+PowerShell持续集成环境搭建(七)构建触发器

Jenkins 有三种类型的构建触发器，如下图：

• Build after other projects are built：在其他项目构建后构建；
• Build periodically：定时构建；
• Poll SCM：定时检查代码更新，如果有更新则构建。

其中“Build periodically”和“Poll SCM”使用的是Cron，帮助文档如下：

This field follows the syntax of cron (with minor differences). Specifically, each line consists of 5 fields separated by TAB or whitespace:

  MINUTE HOUR DOM MONTH DOW

MINUTE	Minutes within the hour (0–59)
HOUR	The hour of the day (0–23)
DOM	The day of the month (1–31)
MONTH	The month (1–12)
DOW	The day of the week (0–7) where 0 and 7 are Sunday.

To specify multiple values for one field, the following operators are available. In the order of precedence,

• * specifies all valid values
• M-N specifies a range of values
• M-N/X or */X steps by intervals of X through the specified range or whole valid range
• A,B,...,Z enumerates multiple values

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 *