Re: How to start and verify cron?

[Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>]

On 2019-07-12 10:18, David Karr wrote:
> On Fri, Jul 12, 2019 at 8:20 AM Brian Inglis wrote:
>> On 2019-07-11 15:20, David Karr wrote:
>>> On Thu, Jul 11, 2019 at 12:56 PM David Karr wrote:
>>>     On Wed, Jul 10, 2019 at 4:04 PM Brian Inglis wrote:
>>>         On 2019-07-10 16:15, David Karr wrote:
>>>         > On Wed, Jul 10, 2019 at 10:20 AM Brian Inglis wrote:
>>>         >     On 2019-07-10 10:55, David Karr wrote:
>>>         >     > I've checked the user guide and the FAQ, and I can't find any
>>>         information
>>>         >     > about how to start cron and verify that it's working.  I found
>>>         other blog
>>>         >     > posts on other sites, but some of them are old.
>>>         >
>>>         >     Did you run service setup script /bin/cron-config to set up the
>>>         service?
>>>         > When I ran that now, it says "Cron is already installed as a service under
>>>         > account ...", so I assume that means that I did.
>>>         >     > I had installed cron, and I thought it was working, but now I
>>>         think that it
>>>         >     > is not.  If I edit "~/crontab" and then run "crontab -l", it
>>>         lists the
>>>         >     > changes I've made to jobs, so at least that is working.  The
>>>         real job I
>>>         >     > have didn't appear to be doing what it was supposed to be doing,
>>>         so I added
>>>         >     > a new trivial job that just appends output from "date" to a file
>>>         in my
>>>         >     > homedir, and after the scheduled time of the job, the file was
>>>         not created.
>>>         >
>>>         >     Messages from cron and other active services should be visible in
>>>         the Windows
>>>         >     application event log if you have not set up a syslog service.
>>>         > I went through it, but I didn't see any indications of issues with
>>>         cron.  I'm
>>>         > not sure what to look for, or where in the event log interface.
>>>         >     > This is the additional job I added:
>>>         >     >
>>>         >     >     40,42,44 * * * * date >> /home/<myuid>/date.txt
>>>         >     >
>>>         >     > I did find a "/var/log/cron.log", but it is empty, and the
>>>         modtime is from
>>>         >     > a few months ago.
>>>         >     >
>>>         >     > One blog post I found talks about running "cygrunsrv -I cron -p
>>>         >     > /usr/sbin/cron -a -D". I just did this, and it reports "The
>>>         specified
>>>         >     > service already exists."
>>>         >     >
>>>         >     > This is my uname -a output:
>>>         >     >
>>>         >     >     CYGWIN_NT-6.1 ... 3.0.3(0.338/5/3) 2019-03-09 19:12 x86_64 Cygwi
>>>         >     For a more Unix like and self contained Cygwin approach, install
>>>         syslog-ng, run
>>>         >     service setup scripts /bin/cygserver-config /bin/syslog-ng-config
>>>         >     /bin/cron-config, add service dependencies to start up in that
>>>         order, and you
>>>         >     should see cron messages in /var/log/syslog if you run elevated:
>>>         you can also
>>>         >     run chmod elevated to make /var/log/syslog world readable, or
>>>         setfacl to add
>>>         >     user or group read ACLs.
>>>         > How do I add service dependencies to start up in a particular order?
>>>         In an elevated cmd or bash shell:
>>>         elevated > OR # sc config syslog-ng depend= cygserver
>>>         elevated > OR # sc config cron depend= syslog-ng/cygserver
>>>         N.B. the "=" is part of each keyword; multiple service dependencies are
>>>         separated by "/".
>>>     It's curious that when I bring up the default "Packages" view, filtering for
>>>     "syslog-ng" doesn't find anything.  I had to switch to the Categories view,
>>>     and then filtering for that found it.
>>> After doing all of this, I still can't get cron jobs to work, and I can't get
>>> any info on why.
>>> This is the current output from "crontab -l":
>>> 0       0,12    *       *       *       find /tmp/.logcache/ -type f -mtime +6
>>> -exec rm {} \;
>>> 14,15,16,17     *       *       *       *        date >> /home/dk068x/date.txt
>>> I've tried editing that last one and changing the minutes to include upcoming
>>> minutes, and then after those minutes, I check the results, and there are none.
>>> Nothing in cron.log or syslog-ng.log.
>> Did you run the <service>-config scripts to setup the services?
>> Did you restart all services after any changes?
>>         # for srv in cygserver syslog-ng cron; do \
>>                 for o in -Q -E -Q -S -Q; do \
>>                         cygrunsrv $o $srv; done; done
>> Check /dev/log:
>>         # ls -lF --color /dev/log
>>         srw-rw-rw- 1 SYSTEM SYSTEM 0 Jul 10 12:28 /dev/log=
>> if you don't see a pink /dev/log with "=" flag, and it's just black with no "="
>> flag, rm /dev/log and restart syslog-ng as above.
>> Do not forget to *ALWAYS* shut down all Cygwin services before running setup to
>> upgrade any Cygwin packages.
> I assume it would be possible to script this?  How would I do this?

	# cygrunsrv -L | xargs -n1 cygrunsrv -E
OR
	# for o in -Q -E -Q; do \
		for srv in cygserver syslog-ng cron; do \
			cygrunsrv $o $srv; \
		done; \
	done

>> You can check the status of all services with a command such as
>> $ cygrunsrv -VL | sed -Ee '/^Service\s*:\s*/{s//
>> /;s/\s+$//;s/\s*(\S+)\s+\(Installation\spath\s*:\s*.*\)$/
>> (\1)/;H;};/^Current\sState\s*:\s*/{s// /;s/\s*$/  /;H;};$!d;${x;s/\n|\s+$|^\s+//g;}'
>> cron Running   cygserver Running   syslog-ng Running

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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