Crontab troubleshooting

scottalanmiller

@Sparkum said in Crontab troubleshooting:

@scottalanmiller

So since noticing its a bash script (the script is to check if a service is running, if it does it echos "service is running" if not it starts the service.

So being that its a bash script should I run

bash /home/sparkum/job.sh

If you have to run ANY shell in front of the script, it's not going to work in cron. You aren't doing that in cron. They must be identical, not "similar."

scottalanmiller

sh is normally an alias of bash.

Sparkum

So if I run

 /home/sparkum/cron/job.sh

I get the output that the service is running (which it isnt)

if I run

 sh /home/sparkum/cron/job.sh

it says

 /home/sparkum/cron/job.sh: 4: /home/sparkum/cron/job/sh: 5: not round
 starting service

and then all is working....

Sparkum

Script I'm using is

 #!/bin/bash 
 service=replace_me_with_a_valid_service

 if (( $(ps -ef | grep -v grep | grep $service | wc -l) > 0 ))
 then
 echo "$service is running!!!"
 else
 /etc/init.d/$service start
 fi

scottalanmiller

@Sparkum said in Crontab troubleshooting:

So if I run
 /home/sparkum/cron/job.sh
I get the output that the service is running (which it isnt)

if I run
 sh /home/sparkum/cron/job.sh
it says
 /home/sparkum/cron/job.sh: 4: /home/sparkum/cron/job/sh: 5: not round
 starting service
and then all is working....

So something is wrong with your script, then. You need to fix the script so that it works properly before talking about scheduling it. Why is it giving bad output when run as intended?

scottalanmiller

Before we fix this, let's step back. What is the goal here, this does not feel like the right way to be approaching the problem.

Sparkum

@scottalanmiller

Simply to check if a service is running, if it is do nothing,

If the service has stopped, to start it.

scottalanmiller

@Sparkum said in Crontab troubleshooting:

@scottalanmiller

Simply to check if a service is running, if it is do nothing,

If the service has stopped, to start it.

Then why use a script rather than using an industry standard tool for that? Like having the system keep it running itself or using something built for this? Why reinvent the wheel?

Sparkum

@scottalanmiller

Simply chalk it up to me learning.

If you wouldnt mind throwing me in the right direction I'll be on my way haha

scottalanmiller

Even if you do want to reinvent the wheel.... the OS has tools for that, too. You are at the mercy of things with service in their names. That's not good.

What OS are you on? /etc/init.d is deprecated.

Sparkum

@scottalanmiller
Using Ubuntu 14.04

scottalanmiller

@Sparkum said in Crontab troubleshooting:

@scottalanmiller
Using Ubuntu 14.04

Oh okay, probably on the legacy system still then. In that case, what you are looking to do is better done with...

/etc/init.d/servicename status