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Cron job and tty

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# 1  
Old 05-22-2012
Cron job and tty
Hi,

I have a document oriented database. IF there are multiple instances of the same running, i kill all those and then start the server again. i check for multiple instances within a specific time intervel. i.e. i make use of crontab.

now the server is getting restarted after the cronjob works. But problem is that the UI is still down. i.e. not accessible.

how do i modify a cronjob such that the tty is set so that the UI is UP.
# 2  
Old 05-22-2012
What do you mean by 'tty is set'?
# 3  
Old 05-22-2012
i did ps uxww and analysed the result.

i checked it after runnin the cronjob.
i also checked it running the restart script manually.

the diff: between the result was that tty field was set for second case. say value of tty was pts/2. while the tty value for the first case was ?

i came to knw that the cronjob does not hv connection to terminal.
# 4  
Old 05-22-2012
The value of the tty comes from the userid that has logged into the database user interface. It is assigned by the OS when they log in. This isn't something that is being set by the startup. If there is a separate process that presents a web front end, then I would check to ensure you are using the right startup script to restart your database and associated processes instead of just trying to restart it manually.
# 5  
Old 05-22-2012
Thanks dagmier for the reply. But my doubt is that, when i restart the server manually the tty is automatically set. but y is it not getting set when i restart the server using same command but with help of crontab. ??
Last edited by sarath@123; 05-22-2012 at 03:21 PM..
# 6  
Old 05-22-2012
The process just inherits the TTY of whatever's running it. When you run it manually, it inherits the TTY (terminal) you ran the command in.

cron doesn't even have a TTY. So, no TTY is inherited.

Do you actually need a TTY?
Last edited by Corona688; 05-22-2012 at 06:30 PM..
# 7  
Old 05-23-2012
Thanks Corona688 for your reply.

Whenever the process is restarted manually, the UI of the document oriented db server is accessible. When the same is done using cronjob the UI of the document oriented db server is not accessible.

what could be the possible reason? any idea?
Last edited by sarath@123; 05-23-2012 at 01:26 AM..
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