[Chicago-talk] Determining if another perl process is running.

[Richard Reina]

The only AI I have messed around with is: AI::NaiveBayes. I have yet to find any use for open AI because I guess I lack the imagination to find an interesting but sometimes inaccurate chat bot useful. Am I missing something?
 



On Mon, 25 Nov 2024 09:54:06 -0600, Alan Mead <amead2 at alanmead.org> wrote:
 
I like Andy's PID file suggestion, but I would be inclined to make this a bash script rather than a perl one-liner and test something like:

`ps aux | grep perl | grep starman`

 

And if that command causes it's own failure (by always creating a process with 'perl' and 'starman') then:

`ps aux | grep [p]erl | grep [s]tarman`

 

If you find bash scripting not super easy (like me), ChatGPT is very helpful. It's helped me a lot in writing better admin scripts.

 

-Alan

 

On 11/25/24 9:41 AM, Andy Bach wrote:


P {margin-top:0;margin-bottom:0;}

Need to expand your grep RE or add a grep -v to remove the ones you don't want, though, then you have to remove the one you just added.  Another is to track the pids, find the ones you've created and look for one outside that set.  You could have starman (if it doesn't) create a .pid file and use that to check that pid's status (with lsof -p <pid> maybe), rather than grepping.


From: Chicago-talk <chicago-talk-bounces+andy_bach=wiwb.uscourts.gov at pm.org> on behalf of Richard Reina <gatorreina at gmail.com>
Sent: Sunday, November 24, 2024 5:19 PM
To: Chicago.pm chatter <chicago-talk at pm.org>
Subject: [Chicago-talk] Determining if another perl process is running.

 



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Hello everyone,
 

So excited about the Winter Perl Conference that I just registered for that I thought I would rebuild my aged Perl Dancer2 website. I 've done so and deployed it on a Digital Ocean droplet but I've hit a snag in setting up a cron job to make sure starman is running. It seems my query into whether the process is running gets treated as evidence that the process IS running. 

 

When I do:

 

perl -e 'my $smstat = `ps -ef | grep starman`; unless ($smstat =~ /starman master/) { system("XDG_RUNTIME_DIR=/run/user/1001 exec /home/starman/starman.pl start &>> /home/starman/starman.log"); print localtime . " starting starman\n"; } else { print "Starman is already running\n\n\n $smstat\n" }';
 

RESULTS IN:

 

Starman is already running


 starman   203805       1  0 Nov08 ?        00:00:00 /lib/systemd/systemd --user
starman   203806  203805  0 Nov08 ?        00:00:00 (sd-pam)
root      472040     385  0 Nov20 ?        00:00:00 sshd: starman [priv]
starman   472049  472040  0 Nov20 ?        00:00:01 sshd: starman at pts/0
starman   472050  472049  0 Nov20 pts/0    00:00:00 -bash
starman   544383  472050  0 23:11 pts/0    00:00:00 perl -e my $smstat = `ps -ef | grep starman`; unless ($smstat =~ /starman master/) { system("XDG_RUNTIME_DIR=/run/user/1001 exec /home/starman/starman.pl start &>> /home/starman/starman.log"); print localtime . " starting starman\n"; } else { print "Starman is already running\n\n\n $smstat\n" }
starman   544384  544383  0 23:11 pts/0    00:00:00 sh -c ps -ef | grep starman
starman   544385  544384  0 23:11 pts/0    00:00:00 ps -ef
starman   544386  544384  0 23:11 pts/0    00:00:00 grep starman

 

It always says it's running even if it is not apparently because it's seeing 'starman master/ in the perl script that is inquiring. 

 

Anyone know a good solution to avoid this so that I can determine whether my starman startup script is indeed running?

 


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Alan D. Mead, Ph.D.
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