定时构建语法

* * * * *

第一个*表示分钟，取值0~59
第三个*表示一个月的第几天，取值1~31
第四个*表示第几月，取值1~12
第五个*表示一周中的第几天，取值0~7，其中0和7代表的都是周日

常用定时构建

由于项目的代码一般存在放SVN中，而一个SVN往往是有多个项目组在提交代码，而每个项目组又有多人组成，其中每个人也都在对自己的那块代码不停地在进行维护，所以说对于一个公司而言，SVN的提交记录往往是很频繁的，正因为如此，Jenkins在执行自动化构建时往往是以天为单位来执行的，下面举的例子就是在一天中常用的定时构建示例。

每隔5分钟构建一次

H/5 * * * *

每两小时构建一次

H H/2 * * *

每天中午下班前定时构建一次

0 12 * * *

每天下午下班前定时构建一次

0 18 * * *

官方说明

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 at 45 minutes past the hour starting at 9:45 AM and finishing at 3:45 PM every weekday.

45 9-16/2 * * 1-5

once in every two hours slot between 9 AM and 5 PM every weekday (perhaps at 10:38 AM, 12:38 PM, 2:38 PM, 4:38 PM)

H 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 *
Time zone specification

Periodic tasks are normally executed at the scheduled time in the time zone of the Jenkins master JVM (currently Asia/Shanghai). This behavior can optionally be changed by specifying an alternative time zone in the first line of the field. Time zone specification starts with TZ=, followed by the ID of a time zone.

Complete example of a schedule with a time zone specification:

TZ=Europe/London
# This job needs to be run in the morning, London time
H 8 * * *
# Butlers do not have a five o'clock, so we run the job again
H(0-30) 17 * * *

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