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 valuesM-N
specifies a range of valuesM-N/X
or*/X
steps by intervals of X through the specified range or whole valid rangeA,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 *
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