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Full Discussion: Script to Run Multiple Systems Checks and mail me the results after every reboot- Linux
Top Forums Shell Programming and Scripting Script to Run Multiple Systems Checks and mail me the results after every reboot- Linux Post 302945657 by pocodot on Monday 1st of June 2015 10:25:44 AM
Old 06-01-2015
Script to Run Multiple Systems Checks and mail me the results after every reboot- Linux
Hello,

I'm trying to create a mechanism wherein a set of Production servers will email me the results of system checks like Uptime, NFS Mounts and a Process after every scheduled reboot.

For this, I figured I'd use the @reboot parameter that crond comes with.
I have added the below onliner in crontab for root:
Code:
@reboot up=`/usr/bin/uptime| cut -d, -f1,2`; tck=`ls -l /path/to/mounted/file`; pst=`ps -ef | grep ManageProcess`; echo -e "Uptime: $up \n\nMount Check: $tck \n\nManageProcess  Check:\n\n$pst"| mail -s "[DIFMON]`hostname` is UP After Reboot"  pocodot@mydomain.com

No mail. If I run the above line on a shell, I get proper email with all the status.

I figured the ; after each command may be cutting the command run on crontab and tried as below:

Code:
@reboot up=`/usr/bin/uptime| cut -d, -f1,2`;
@reboot tck=`ls -l /path/to/mounted/file`;
@reboot pst=`ps -ef | grep ManageProcess`;
@reboot echo -e "Uptime: $up \n\nMount Check: $tck \n\nManageProcess Check:\n\n$pst"| mail -s "[DIFMON]`hostname` is UP After Reboot" pocodot@mydomain.com

I guess crontab is possibly not able to handle variable declaration.

I dont want to run a script from crontab since this is a production server and I wont be allowed to place my script anywhere in filesystem.

Could anyone help me with this please?

Bonus question: I notice that @reboot option runs even if the crond service is restarted whereas the documents say this will run only on boot/reboot. Is this not weird?
 

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LEARN ABOUT CENTOS

halt

HALT(8) 							       halt								   HALT(8)

NAME

       halt, poweroff, reboot - Halt, power-off or reboot the machine

SYNOPSIS

       halt [OPTIONS...]

       poweroff [OPTIONS...]

       reboot [OPTIONS...]

DESCRIPTION

       halt, poweroff, reboot may be used to halt, power-off or reboot the machine.

OPTIONS

       The following options are understood:

       --help
	   Prints a short help text and exits.

       --halt
	   Halt the machine, regardless of which one of the three commands is invoked.

       -p, --poweroff
	   Power-off the machine, regardless of which one of the three commands is invoked.

       --reboot
	   Reboot the machine, regardless of which one of the three commands is invoked.

       -f, --force
	   Force immediate halt, power-off, reboot. Do not contact the init system.

       -w, --wtmp-only
	   Only write wtmp shutdown entry, do not actually halt, power-off, reboot.

       -d, --no-wtmp
	   Do not write wtmp shutdown entry.

       --no-wall
	   Do not send wall message before halt, power-off, reboot.

EXIT STATUS

       On success, 0 is returned, a non-zero failure code otherwise.

NOTES

       These are legacy commands available for compatibility only.

SEE ALSO

       systemd(1), systemctl(1), shutdown(8), wall(1)

systemd 208																   HALT(8)
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