[Solved] Unable to mailx new $pid for a script restart
Ill try to make this brief:
I am trying to get the script below to run another script defined as BATNAM.
The script runs fine, does what i designed it to do, however...
I would like it to mailx the NEW $pid that was restarted.
This script is supposed to go in crontab as root, and run by the min checking if $pid exists.
Lastly, should i try a diff approach, maybe a "while" or "until"? rather than "if/then/else"
I have tried sleep 10, as it does take more than 7 seconds for the script to show up in ps -ef|grep myusername.
could you pls review the code below, and make suggestions.
This is a simple syntax issue and I am unable to find it.
I am on hpux / /usr/bin/sh, and I have root if necessary.
thanks!
Code:
#!/usr/bin/sh -x
# set the locals
stty intr '^c'
# set the vars
BATDIR="/usr/script8/batch" # batch dir
BATNAM="bat_fstsi61c.sh" # batch process file
BATPF="bat_fstsi61.pf" # batch to grep
BATSVC="SIGTEST" # mail topic
BATPF="bat_fstsi61.pf" # batch to grep
SERVER="PHANTOM" # servername here
SDIR="/apps/sigmon/dvl/fst61" # sigmon dir
SIN="$SDIR/in" # in dir
SPROC="$SDIR/proc" # proc dir
SLOG="/usr/script8/batch/LOGS" # log dir
SMAIL="/usr/script8/batch/EMAILS" # email log dir
SMAILER="petey" # person(s) to email
# export the vars
export BATDIR BATNAM BATSVC BATPF SERVER SDIR SIN \
SPROC SLOG SMAIL SMAILER
pid=`ps -ef|grep "$BATPF" |grep -v grep |awk -F" " '{print $2}'`
echo $pid
if [ "$pid" = "" ]
then
/usr/bin/sh $BATDIR/$BATNAM
sleep 10
mailx -s "${SERVER} ${BATNAM} restarted" petey
sleep 10
echo "$pid" > $SLOG/"$BATNAM-restart-on--`date +%F-%T`"
else
echo "service is ok"
pid=""
fi
Last edited by olyanderson; 06-06-2013 at 04:57 PM..
Reason: got it, thanks. ill use from now one, im new here
The section (if block) where you call mailx is on the condition that $pid is zero length.
So you cannot send an "empty" pid and be able to read it. So, help me here. What are you trying to do?
welp the first thing is, i check if the other batch is running,
if it is NOT running $pid="" (empty) which means there is no pid running with that grep, THEN, restart the process, then exit.
If it is running, the current or new pid started moments ago with above NOT statement, THEN, simply do nothing, echo "running", no log needed.
If it is NOT running, restart, grab the NEW $pid and email that new pid with mailx, AND echo the restarted to the log file.
everything is a go, perms wise, this script restarts the dead script. but it hangs, i want it to ALSO exit out with zero exit status and recheck via crontab every 1 min. this is a HA server, and needs constant babying lol. it doesn't cry much, but when it does, people lose jobs.
thanks for your help again, i appreciate it.
anymore input, just ask
just restart the process asynchronously and exit, or is it supposed to run forever? Does the trace of the script produced by sh -x show that the two sleeps, mailx, date, and echo are run when the batch is not running? Should:
i copied this script from elsewhere, i am learning. i am glad you gave some input. thanks. to answer your questions to help:
1. Why does your script initialize BATPF twice?
it doesn't, typo, it will be removed. thanks for noticing that DON!
2. yes it does start a process - another script, a batch script actually that is suppose to run and accept requests to a client driven db - we won't get into that.
3. Why bother setting pid to an empty string just before exiting when the service is running?
I didn't, I do not know what I am doing. I'm trying though.
The sleep is there in the hopes that it will produce a new $pid, that is one thing that is puzzling me the most.
Like I said before, the script runs fine ( the one this is calling ) and needs to be online 24/7. This script is supposed to CHECK to see if ANY pid matches the grep in BATPF. it takes 10 seconds for a new pid to be reproduced. I am trying to wait/sleep/capture that new pid in the "if".
Is there a better way?
Don I will try to do the steps you suggested. Looks like it will work. But remember, I need this script to end. so running it in background process with & looks great, but will take 10 seconds for that new pid to come avail? If I start the backend script, it takes a few mins to produce a pid(the backend is a db starting with a client) and usually takes same amount of time for pid via ps and grep to show its not there - aka gracefully shutdown that connection. DB is heavy transaction based.
thanks, hope that helps. pls ask anything more. thanks guys...
i copied this script from elsewhere, i am learning. i am glad you gave some input. thanks. to answer your questions to help:
1. Why does your script initialize BATPF twice?
it doesn't, typo, it will be removed. thanks for noticing that DON!
You're welcome.
Quote:
Originally Posted by olyanderson
2. yes it does start a process - another script, a batch script actually that is suppose to run and accept requests to a client driven db - we won't get into that.
If you want to fix the problem, we need to get into that. The changes I suggested should work if the script starts the batch script and waits for it to complete. If you would have shown us the trace output produced by /usr/bin/sh -x, we might be able to give you a definitive answer; without seeing that output or seeing what is in /usr/script8/batch/bat_fstsi61c.sh, we can only make wilde guesses (like I did before).
If /usr/script8/batch/bat_fstsi61c.sh is the batch script and it doesn't return until it is killed, what I suggested should work. If /usr/script8/batch/bat_fstsi61c.sh asynchronously starts the batch script and returns without waiting for it to complete, what I suggested will not work. In that case you'll need to rerun the ps pipeline to reset pid after the batch process is restarted. You wait 20 seconds after /usr/script8/batch/bat_fstsi61c.sh returns (if it returns) before saving $pid in your log file, but you haven't reset pid so you know it has to be an empty string whether or not the batch script restarted successfully.
Quote:
Originally Posted by olyanderson
3. Why bother setting pid to an empty string just before exiting when the service is running?
I didn't, I do not know what I am doing. I'm trying though.
The sleep is there in the hopes that it will produce a new $pid, that is one thing that is puzzling me the most.
Like I said before, the script runs fine ( the one this is calling ) and needs to be online 24/7. This script is supposed to CHECK to see if ANY pid matches the grep in BATPF. it takes 10 seconds for a new pid to be reproduced. I am trying to wait/sleep/capture that new pid in the "if".
Is there a better way?
There are two scripts. You are talking as though there is only one. Until you understand that there are two and how they interact, we're lost. If you actually mean that the script above is the contents of /usr/script8/batch/bat_fstsi61c.sh, then your description of what is going on is extremely confusing and could be rewritten in a much simpler fashion.
Quote:
Originally Posted by olyanderson
Don I will try to do the steps you suggested. Looks like it will work. But remember, I need this script to end. so running it in background process with & looks great, but will take 10 seconds for that new pid to come avail? If I start the backend script, it takes a few mins to produce a pid(the backend is a db starting with a client) and usually takes same amount of time for pid via ps and grep to show its not there - aka gracefully shutdown that connection. DB is heavy transaction based.
thanks, hope that helps. pls ask anything more. thanks guys...
If the script isn't ending when it restarts the batch process, my guess still fits the data you're seeing. But until you show us the trace output you got from running this script or show us the contents of /usr/script8/batch/bat_fstsi61c.sh, we are just guessing.
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06-06-2013
