cron-formula
This formula creates cron setup and jobs from pillar data
Pillar example
cron: # Main cron section
jobs: # A dictionary of cron jobs
job1: # the job id
name: helloworld # the command to be run
disabled: False # (optional) True to disable the job, default is False
minute: 1 # (optional) The information to be set into the minute section. Default is */30
hour: 2 # (optional) The information to be set in the hour section. Default is *
dayweek: 3 # (optional) The information to be set in the day of week section. Default is *
daymonth: # (optional) The information to be set in the day of month section. Default is *
user: john # (optional) The name of the user whose crontab needs to be modified, defaults to the root user
random_delay: 0 # (optional) set a max random delay before running the job
one_instance: False # (optional) True will ensure that only one instance runs the job
comment: "This is my job!" # (optional) User comment to be added on line previous the cron job
log: "/var/log/helloworld.log" # (optional) The file to log the command output to, defaults to cron.logSyntax idiosyncrasies
Obviously shell scripts can have a very special syntax with special characters and so on. Sometimes you can get errors like:
ParserError: while parsing a block mapping
in "<unicode string>", line 22, column 7:
- name: ' /usr/bin/python /srv/sal ...
^
expected <block end>, but found '<scalar>'
in "<unicode string>", line 22, column 94:
Below is a complex example with some such special characters. This was done with the help of http://stackoverflow.com/questions/3790454/in-yaml-how-do-i-break-a-string-over-multiple-lines
process_foo_queue: # the job id
name: |-
docker exec my_container bash -c ''RAILS_ENV=production bundle exec rake foo:process_queue''
disabled: False # (optional) True to disable the job, default is False
minute: '*' # (optional) The information to be set into the minute section. Default is */30
one_instance: True # (optional) True will ensure that only one instance runs the job
log: "/var/log/schedule.log"So what is happening here is that the we enter the command in "name:" using |- to indicate a multiline string that does not have any newlines. The double quotation mark results to a single quotation mark. The minute: * may indicate an anchor reference, if so enclose in single quotes. Finally, although not used here, it is worth mentioning that the characters \ and " must be escaped by \ .
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