Yrurtj

I have a jar file which I am running like this in my Ubuntu 10.10 and then it starts my exhibitor server in the background -

nohup java 

    -jar /pekooz/exhibitor-1.5.1/lib/exhibitor-1.5.1-jar-with-dependencies.jar 

    -c file --fsconfigdir /opt/exhibitor/conf 

    --hostname machineA > exhibitor.out &

Now I am trying to use crontab to check whether my exhibitor server is running or not. If it is not running, then start it again so I decided to use crontab and I did the below steps to setup crontab -

1. Created a new crontab by running crontab -e.


2. 
   

   Added this line to the file that just opened

   
   
   

   */5 * * * * pgrep -f exhibitor || nohup java -jar /pekooz/exhibitor-1.5.1/lib/exhibitor-1.5.1-jar-with-dependencies.jar -c file --fsconfigdir /opt/exhibitor/conf --hostname machineA > exhibitor.out
   
   

   
   



3. Save the file and exit the editor.

So for the testing purpose to see whether my crontab is working or not, I started my exhibitor server like this firstly -

$ nohup java 

    -jar ./exhibitor-1.5.1/lib/exhibitor-1.5.1-jar-with-dependencies.jar 

    -c file --fsconfigdir /opt/exhibitor/conf 

    --hostname machineA > exhibitor.out &

[1] 14401



$ nohup: ignoring input and redirecting stderr to stdout

And then I setup my crontab as shown above with the steps. After that I did kill -9 14401 so that I can see whether my exhibitor server is getting restarted automatically by crontab or not. And apparently, they didn't get started up and I don't see any error as well. Below is the log -

$ sudo tail -f /var/log/syslog

Nov  5 17:21:45 machineA crontab[12755]: (cronusapp) BEGIN EDIT (cronusapp)

Nov  5 17:23:17 machineA crontab[12755]: (cronusapp) END EDIT (cronusapp)

Nov  5 17:25:01 machineA CRON[13671]: (root) CMD (  puppet apply /etc/puppet/manifests/motd-stats.pp >>$PUPPET_LOG 2>&1)

Nov  5 17:25:01 machineA CRON[13672]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)

Nov  5 17:25:01 machineA CRON[13673]: (cronusapp) CMD (pgrep -f exhibitor || nohup java -jar /pekooz/exhibitor-1.5.1/lib/exhibitor-1.5.1-jar-with-dependencies.jar -c file --fsconfigdir /opt/exhibitor/conf --hostname machineA > exhibitor.out)

Nov  5 17:25:01 machineA postfix/pickup[2345]: 2B0D8819F9: uid=78402 from=<cronusapp>

Nov  5 17:25:01 machineA postfix/cleanup[13679]: 2B0D8819F9: message-id=<20141106002501.2B0D8819F9@machineA.domain.host.com>

Nov  5 17:25:01 machineA postfix/qmgr[25623]: 2B0D8819F9: from=<cronusapp@machineA.domain.host.com>, size=814, nrcpt=1 (queue active)

Nov  5 17:25:01 machineA postfix/local[13681]: 2B0D8819F9: to=<cronusapp@machineA.domain.host.com>, orig_to=<cronusapp>, relay=local, delay=0.11, delays=0.07/0/0/0.04, dsn=2.0.0, status=sent (delivered to mailbox)

Nov  5 17:25:01 machineA postfix/qmgr[25623]: 2B0D8819F9: removed

What am I doing wrong here? Why my crontab is not working? I just need to restart my exhibitor server automatically if they went down somehow.

Is java in /usr/bin directory? The crontab has a minimal PATH by default. You may have to set JAVA_HOME and PATH in your crontab:

*/5 * * * * JAVA_HOME=/opt/java/latest;export JAVA_HOME; 

    PATH=$PATH:$JAVA_HOME/bin; 

    pgrep -f exhibitor || nohup java 

    -jar /pekooz/exhibitor-1.5.1/lib/exhibitor-1.5.1-jar-with-dependencies.jar 

    -c file --fsconfigdir /opt/exhibitor/conf --hostname machineA > exhibitor.out