salt.states.cron¶
Management of cron, the Unix command scheduler.¶
The cron state module allows for user crontabs to be cleanly managed.
Cron declarations require a number of parameters. The timing parameters need to be declared: minute, hour, daymonth, month, and dayweek. The user whose crontab is to be edited also needs to be defined.
By default, the timing arguments are all *
and the user is root. When
making changes to an existing cron job, the name declaration is the unique
factor, so if an existing cron that looks like this:
date > /tmp/crontest:
cron.present:
- user: root
- minute: 5
Is changed to this:
date > /tmp/crontest:
cron.present:
- user: root
- minute: 7
- hour: 2
Then the existing cron will be updated, but if the cron command is changed, then a new cron job will be added to the user's crontab.
Additionally, the temporal parameters (minute, hour, etc.) can be randomized by
using random
instead of using a specific value. For example, by using the
random
keyword in the minute
parameter of a cron state, the same cron
job can be pushed to hundreds or thousands of hosts, and they would each use a
randomly-generated minute. This can be helpful when the cron job accesses a
network resource, and it is not desirable for all hosts to run the job
concurrently.
/path/to/cron/script:
cron.present:
- user: root
- minute: random
- hour: 2
New in version 0.16.0.
Since Salt assumes a value of *
for unspecified temporal parameters, adding
a parameter to the state and setting it to random
will change that value
from *
to a randomized numeric value. However, if that field in the cron
entry on the minion already contains a numeric value, then using the random
keyword will not modify it.
-
salt.states.cron.
absent
(name, user='root', **kwargs)¶ Verifies that the specified cron job is absent for the specified user; only the name is matched when removing a cron job.
- name
- The command that should be absent in the user crontab.
- user
- The name of the user who's crontab needs to be modified, defaults to the root user
-
salt.states.cron.
file
(name, source_hash='', user='root', template=None, context=None, replace=True, defaults=None, env=None, backup='', **kwargs)¶ Provides file.managed-like functionality (templating, etc.) for a pre-made crontab file, to be assigned to a given user.
- name
The source file to be used as the crontab. This source file can be hosted on either the salt master server, or on an HTTP or FTP server. For files hosted on the salt file server, if the file is located on the master in the directory named spam, and is called eggs, the source string is salt://spam/eggs.
If the file is hosted on a HTTP or FTP server then the source_hash argument is also required
- source_hash
- This can be either a file which contains a source hash string for the source, or a source hash string. The source hash string is the hash algorithm followed by the hash of the file: md5=e138491e9d5b97023cea823fe17bac22
- user
- The user to whom the crontab should be assigned. This defaults to root.
- template
- If this setting is applied then the named templating engine will be used to render the downloaded file. Currently, jinja and mako are supported.
- context
- Overrides default context variables passed to the template.
- replace
- If the crontab should be replaced, if False then this command will be ignored if a crontab exists for the specified user. Default is True.
- defaults
- Default context passed to the template.
- backup
- Overrides the default backup mode for the user's crontab.
-
salt.states.cron.
present
(name, user='root', minute='*', hour='*', daymonth='*', month='*', dayweek='*')¶ Verifies that the specified cron job is present for the specified user. For more advanced information about what exactly can be set in the cron timing parameters, check your cron system's documentation. Most Unix-like systems' cron documentation can be found via the crontab man page:
man 5 crontab
.- name
- The command that should be executed by the cron job.
- user
- The name of the user who's crontab needs to be modified, defaults to the root user
- minute
- The information to be set into the minute section, this can be any
string supported by your cron system's the minute field. Default is
*
- hour
- The information to be set in the hour section. Default is
*
- daymonth
- The information to be set in the day of month section. Default is
*
- month
- The information to be set in the month section. Default is
*
- dayweek
- The information to be set in the day of week section. Default is
*