Cron is a time-based job scheduler in Unix-like computer operating systems. Cron enables users to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.

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Change cron.daily run time on ubuntu

Am I correct in understanding that to update the time that a daily cron job runs (from /etc/cron.daily/), all I need to do is update the /etc/crontab file? Are there any risks I should be aware of ...
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876 views

Why unison does not run in cronjob?

I want two way data sync between two CentOS based servers, so I installed Unison on both of my CentOS servers. I made a script file on root which runs unison and works fine, and syncs the files, when ...
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95 views

Cronjob screen PHP does not executed [duplicate]

If I execute the following in the terminal it works: screen -dmS tt-rss-daemon sudo -u www-data /usr/bin/php /usr/share/nginx/www/tt-rss/update.php --feeds --daemon If I write the following in a ...
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2k views

Cron task error: WRONG FILE OWNER

I'm using the /etc/cron.d/ folder to store my cron tasks. These tasks are symlinks to my actual file which is kept under VCS. These files are owner by a user named "www-data". I've read that Cron will ...
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1answer
273 views

Issues with MySQL restart on running through a crontab scheduler

I have written a shell script which starts MySQL when its killed/terminated. I am running this shell script using a crontab. My cron looks for the script file named mysql.sh under /root/mysql.sh ...
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32 views

crontab not outputting to log when cronlocks removed on some files

I'm running a variety of crontab curl requests and I'm not sure why SOME of them stopped outputting the contents to log files. The only change I made was removing cronlocks from all of the entries ...
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1answer
522 views

VPS debian 64 bits put cron to reboot at 7:00 every day

I have a VPS with debian 64bit. And I would like to set a daily reboot at 7:00 with $ ps aux root 1844 0.0 0.1 18832 964 ? Ss 07:23 0:00 /usr/sbin/cron so the cron it's ...
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174 views

how to prevent crontab logs from registring in syslog?

I have separate my crontab log into cron.log file by uncommenting the below ling in /etc/syslog.conf, But it register in syslog too. cron.* /var/log/cron.log How ...
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1answer
446 views

Crontab is Not Running Crons [duplicate]

I have crontab setup on my CentOS VPS and it is not running... Here's the cron file: * * * * * php -f /var/zpanel/hostdata/zadmin/public_html/pingrglobe_com/crons/1min.php * * * * * php -f ...
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1answer
79 views

CRON job running but no sign of it in any file

This is an odd one and I know that the answer will be something simple that I have over looked... I have inherited responsibility for a Linux server running an old version of Ubuntu 10.04, it has a ...
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79 views

Script won't do what it should when run with cron

I've got some problem. I have script execution scheduled but when time comes nothing happens. #!/bin/sh TIME=`date +"%d-%m-%Y"` cd /var/www/flyer/data/www/ mysqldump -u root -ppasswd --databases ...
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571 views

Mysterious automated emails

I remember messing around with crontab and setting up email capabilities on a server many months back, and now all of a sudden I'm getting the following email: EMAIL HEADER: from: root ...
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1answer
331 views

One-line backup, compress, scp database file

I support a company with a remotely hosted web site. They use PostgreSQL dbs. I can't write scripts on the remote server, and I don't want to store any backup files on the remote server, but I can ...
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1answer
200 views

Restart crontab @reboot rule without actual reboot

I'm using crontab with a @reboot entry which starts a script containing a endless while-loop that is processing the output of a tail -F command. Is there any way to stop the currently running script ...
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411 views

Proxmox cron.daily log error

I am having a problem with cron.daily job in Proxmox. Its giving me this error: /etc/cron.daily/pve: Can't stat /var/log/pve/tasks/6: No such file or directory at /etc/cron.daily/pve line 78 The ...
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2answers
381 views

How does Cron interact with Kerberos for authentication?

I have a CentOS 6.4 machine which is set up with pam_ldap and pam_krb5. It is configured to use our Active Directory servers for authentication. I can SSH into the machine using AD accounts. I have ...
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1answer
92 views

How can I control a gradual file upload with cron or similar? [closed]

I have several terabytes of data I need to back up to S3/Glacier over a slow link. I want to upload from, say 9pm to 9am and resume from where it left off. Is there free software that would do that ...
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1answer
89 views

Configuring / Securing credentials required by batch job

I have a batch job which should run as cron job on a Linux server. This job requires some credentials to do it's work. Idealy I don't want to have that kind of credentials stored on my server, but ...
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1answer
90 views

cron to anacron migration process

I have a script that I want to run nightly on my lab's RHEL 5 and 6 workstations, so I'm deploying the script to each system's /etc/cron.daily/ directory and making it executable there. But some ...
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68 views

Why is cron using a different Ruby than my user and how to fix it?

I have a cron job that is a Ruby script. The problem is that the ruby executable is different than expected. Ruby was installed from source so it should be the new global default. $ ssh ...
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1answer
709 views

Cron won't use msmtp to send emails in case of failed cronjob

I'm trying to configure a machine so that it will send me an email if one of the cronjobs output something in case of an error. I'm using Debian Wheezy. Cron is working normally (without the email ...
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1answer
167 views

Why is cron mailing me program output even though I've redirected to /dev/null?

I'm trying to restart a system process through cron and getting emailed the startup output of the process. I thought redirecting STDOUT and SDTERR to /dev/null would "silence" the output but alas, ...
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43 views

need at jobs identified by name (advanced atd daemon)

Sometimes I'd like to delete or overwrite (or simply cat) an at job. Unfortunately, the at jobs are identified by a sequential number (file in /var/spool/cron/atjobs), which makes those operations ...
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2answers
848 views

Including file into crontab config?

I'm trying to put project specific crontab config into code repository to make it easy to update cron jobs on all backends when deploying. Is it possible to include files into crontab config? ...
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2answers
4k views

Centos backup mysql using cron job

According to this tutorial http://www.a2hosting.com/kb/getting-started-guide/backing-up-your-data/backups-on-dedicated-servers-and-vps trying to backup mysql database I did: 1) created folders in ...
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1answer
1k views

Crontab maximum command length

Is there a limit of characters a command in a crontab could be ? I have a crontab with a 178 characters command and it seems to be truncated at 164 when executed. I can tell this number from the ...
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336 views

Unable to get cron to append output from wget

I have a cronjob setup and running, but the logfile keeps getting overwritten every time it runs. I would like for the wget output to be appended each time the cron runs. Why is this and how do I fix ...
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334 views

(bsnmpd), uid 0: exited on signal 6 (core dumped) / Syntax error: word unexpected (expecting “then”)

I'm using FreeBSD 9.2-RELEASE: # uname -a FreeBSD f9.alexus.org 9.2-RELEASE FreeBSD 9.2-RELEASE #0 r255898: Thu Sep 26 22:50:31 UTC 2013 root@bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC ...
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1answer
256 views

Why is crontab file periodically overwritten?

I have a Ubuntu 12.10 server with an nginx user that I use to edit a crontab file. Periodically (maybe once every few hours? it's hard to tell), I notice that edits I have made as the nginx user have ...
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1answer
246 views

Understanding my Cronjob and the logs (Debian) [closed]

I'd like my cronjob to run every 5 minutes. It should execute a command which a user can only run from a certain directory. In my:/home/alias/laravel/ directory, I can manually run (as user alias) ...
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1answer
288 views

CentOS 6.3: logrotate and btmp

I had to configure logrotate on a server configured by other system-network administration. First of all I detected that there is no crond, so I had to install sudo yum install vixie-cron. All other ...
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2answers
177 views

running a cron job on a time interval [duplicate]

Is it possible to run a job for 2 hours at a specific time? So lets say I want to run wget command that calls/hits an endpoint in my web app for 2 consecutive hours in a day. Meaning that every single ...
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47 views

Include executed cron command when outputting to log

Is there a way I can include the command that was executed in the output when I'm logging to a file? For example: * * * * * date && /path/to/php /path/to/script.php >> cron.log ...
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1answer
34 views

Cron: where is the /etc/cron.d defined? Is it possible to add a new directory?

In CentOS, where is the /etc/cron.d folder defined? Is it possible to add a new folder that works exactly as it? Example: I have another folder ( /mnt/software/cron ) full of files with the exact ...
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1answer
158 views

dhclient asking for new routing every 1500 seconds, removing my static routing, cron not working

I have a problem with cron job on my ubuntu server 12.04. I have two internet providers - one for fast speed, second - for local resources. So, I'm using command route to up the static routing for ...
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3answers
3k views

How can I run a Cron job to make backups of a MySQL server by SSH

I have a production server running CentOS with a MySQL database. At home, I have a QNAP NAS (runs a little embed linux). I want to make a Cron job on my NAS to backup the data from my CentOS ...
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1answer
81 views

Crontab issue with specific days execution

We have a cron job under a specific user's crontab which should be running only on working week days. Job was running all days before we changed it. After we changed in the following line the days ...
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2answers
277 views

Not sure how to set up cronjob properly to run php function

Im not sure on how I should do to set up a cronjob to run a php function for my website, and doing so by using a URL. I dont want any output etc, I just want the cronjob to run the php function buy ...
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1answer
108 views

Can't stop LAMP graceful restart

I just got my first LAMP up and running, everything works fine except that my server is restarting itself every sunday. When I read the logs I see "Graceful restart requested, doing restart" Should ...
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2answers
3k views

Setting timeout for cron jobs

Do Ubuntu Linux cron (Vixie cron?) support setting timeout for its jobs? Specifically, the process would be killed after X seconds unless it finishes successfully by then. I have had some cases ...
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3answers
647 views

Are Linux cron Jobs each executed sequentially or in parallel?

Lets say I create two cron jobs: Cron Job A, runs every day at 8:00AM Cron Job B, runs every day at 8:05AM However, Cron Job A, takes 12 hours to run (don't ask why, this is an example). Will ...
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1answer
591 views

Why won't this shutdown shell script work under root's crontab when the guest user is logged in? [closed]

I've got a laptop running Lubuntu 13.04 and guest account enabled. People forget to shut it down every day so I figured I'd just put a one line script into root's cron to solve that. No dice. It shows ...
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1answer
473 views

cron.hourly script executing multiple times

The setup I have a script /etc/cron.hourly/msm-hourly that contains this: #!/bin/sh LOGPATH='/opt/msm/servers/cronscripts' LOGFILE="$LOGPATH/msm-start.log" # Make restart dead servers echo "" ...
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1answer
677 views

Crons not working on ISPConfig3

I have a CentOS LEMP stack with ISPConfig3. Everything is working perfectly, except for the cron jobs. I have tested the commands from command line, and they seem to be working fine, but when I put ...
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1answer
1k views

How can I check cron task it's running? [duplicate]

I put a cron script in /etc/cron.d: [root@node ~]# cat /etc/cron.d/reconfig 0 */6 * * * root /root/bin/reconfig.pl But I get no list of cron tasks for root: [root@node ~]# crontab -l no crontab ...
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1answer
53 views

Aggregating emails from cron and cfengine

I've recently taken over administration of a decent size network (900 FreeBSD or Linux hosts across 10 physical sites) where we get a lot of email destined for root, mostly from cfengine (v2). We've ...
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1answer
315 views

cron job not running the script that start vncserver

Hi I wrote a script to start my vncserver when I call it manually via command line. It works as follows: the script is in usr/bin I gave it the right authorization (chmod u+x startvnc) but wen I ...
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3answers
184 views

script bash can't get difference in $PS1 or $- when running interactivelly or via cron

I want my cron scripts being executed verbosly when run interactively by a system user (for debug purpose for instance) and quietly otherwise (for cron, as I want receive e-mail if and only if I get ...
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2answers
384 views

crontab failing to start service via working script

My script works when ran by itself but not via crontab Crontab [root@someserver:/]# crontab -l SHELL=/bin/bash ...
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1answer
5k views

What cron job is /usr/lib/sa/sa1

I have logwatch enabled for my machine. Suddenly I see this line in my logwatch /usr/lib64/sa/sa1 1 1 : 4297 times /usr/lib64/sa/sa2 -A : 29 times run-part /etc/cron.hourly : 716 I tried crontab -e ...