pg_dump error codes

On Mon, 2 Jan 2006, alexandre - aldeia digital wrote:

In my Linux bash backup scripts, I wish to send an e-mail when an error
occurs in pg_dump proccess. And if possible, I want to send the error output
via e-mail.

Anybody knows how to capture the output and send this to an e-mail ONLY if an
error occurs ?

I wrote a generic bash shell script to handle this kind of thing in cron.
See the attachment. As long as the program you're running returns an exit
value of 0 when it succeeds, and a non-zero value when it fails, this will
work. (Thought it's not documented in pg_dump's man page, it does return
sane exit values.)

Just do something like:

/path/to/cron-harness pg_dump your-arguments-here

If pg_dump succeeds, nothing will be output. If it fails, all the normal
output will be returned (and if this is a cron job, mailed to you, by
default).

Check the arguments to mktemp, which may vary on your platform. Any
suggestions or improvements are welcome!

HTH,
Jon

--
Jon Jensen
End Point Corporation
http://www.endpoint.com/
Software development with Interchange, Perl, PostgreSQL, Apache, Linux, ...

On Mon, Jan 02, 2006 at 08:45:28AM -0200, alexandre - aldeia digital wrote:

In my Linux bash backup scripts, I wish to send an e-mail when an error
occurs in pg_dump proccess. And if possible, I want to send the error
output via e-mail.

Anybody knows how to capture the output and send this to an e-mail ONLY
if an error occurs ?

This is more of a shell scripting question than a PostgreSQL question.
See your shell's documentation and read about I/O redirection and
control structures like "if".

Here's a simple but only minimally-tested example that might give
you some ideas:

#!/bin/sh

dumpout=/tmp/dump.out.$$
dumperr=/tmp/dump.err.$$
erruser=root

trap "rm -f $dumperr $dumpout; exit" 1 2 15

if ! pg_dump "$@" > $dumpout 2> $dumperr
then
rm -f $dumpout
mail -s "Dump errors" $erruser < $dumperr
fi

rm -f $dumperr

--
Michael Fuhr

Michael Fuhr wrote:

On Mon, Jan 02, 2006 at 08:45:28AM -0200, alexandre - aldeia digital wrote:

In my Linux bash backup scripts, I wish to send an e-mail when an error
occurs in pg_dump proccess. And if possible, I want to send the error
output via e-mail.

Anybody knows how to capture the output and send this to an e-mail ONLY
if an error occurs ?

This is more of a shell scripting question than a PostgreSQL question.
See your shell's documentation and read about I/O redirection and
control structures like "if".

I know, but I don't found if the pg_dump returns some error code after a
problem.

Here's a simple but only minimally-tested example that might give
you some ideas:

#!/bin/sh

dumpout=/tmp/dump.out.$$
dumperr=/tmp/dump.err.$$
erruser=root

trap "rm -f $dumperr $dumpout; exit" 1 2 15

if ! pg_dump "$@" > $dumpout 2> $dumperr
then
rm -f $dumpout
mail -s "Dump errors" $erruser < $dumperr
fi

rm -f $dumperr

Thank you very much! :)
This is all I need...

Alexandre

Here is a simple one, that keeps 2 copies (one for odd-numbered days and
one for even-numbered days), and emails the admin with the status:

#!/bin/sh

#This script is to back up the production databases
DBLIST="db1 proddb1 proddb2"

PGUSER=dbusername
DUMPDIR=/disk1/database/backups

MAILCMD=/bin/mail
ADMIN_EMAIL='adminemail@mycompany.com'
MAILLOG=/tmp/maillog$$
MAIL_SUBJECT="Database Backup Process"
LOGFILE=/disk1/homedir/database/db_backup.log

function MAILERROR {
$MAILCMD -s "$1" "$ADMIN_EMAIL" <$MAILLOG
rm $MAILLOG
exit 1
}

if ! cd $DUMPDIR ; then
echo "Cannot cd into $DUMPDIR for backup process" >>$LOGFILE
MAILERROR "$MAIL_SUBJECT - Error during cd into $DUMPDIR"
fi

#=== we are going to create 2 sets of dump files, for odd and even days ===
#get the day of the year
NUM=`date '+%j'`
#if we don't delete the leading 0, the shell thinks it is an octal number
NUM=${NUM##0}
RES=$(( $NUM % 2 ))

for DBNAME in $DBLIST; do
echo "Backup of $DBNAME started at $(date)" >>$MAILLOG

DUMPFILE=dump_${DBNAME}_${RES}

echo -e "\nStarting backup of $DBNAME to $DUMPFILE at $(date)" >>$LOGFILE
echo -e "\nStarting backup of $DBNAME to $DUMPFILE at $(date)" >>$MAILLOG

#delete the old file(s)
if [ -e $DUMPFILE ]; then
/bin/rm $DUMPFILE* 2>>$LOGFILE
fi

#using postgresql custom dump format, with compression; allows selective
restore
if ! /usr/local/pgsql/bin/pg_dump -Fc -U $PGUSER $DBNAME >${DUMPFILE}
2>>$LOGFILE ; then
echo "Error during pg_dump of $DBNAME" >> $LOGFILE
echo "Error during pg_dump; see $LOGFILE for details" >> $MAILLOG
MAILERROR "$MAIL_SUBJECT - Error during pg_dump of $DBNAME"
fi

#record process success
echo -e "Backup of $DBNAME complete at $(date)\n" >>$LOGFILE
echo -e "Backup of $DBNAME succeeded $(date)\n\n" >>$MAILLOG
done

MAIL_SUBJECT="$MAIL_SUBJECT - Backup of databases succeeded"
$MAILCMD -s "$MAIL_SUBJECT" "$ADMIN_EMAIL" <$MAILLOG
rm $MAILLOG

exit 0

Hope this helps.
Susan

alexandre - aldeia
digital To: pgsql-general@postgresql.org
<alexandre@ad2.com.br> cc:
Sent by: Subject: [GENERAL] pg_dump error codes

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01/02/2006 02:45
AM

Hi,

(maybe an idiot question)

In my Linux bash backup scripts, I wish to send an e-mail when an error
occurs in pg_dump proccess. And if possible, I want to send the error
output via e-mail.

Anybody knows how to capture the output and send this to an e-mail ONLY
if an error occurs ?

Thanks

Alexandre

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