Re: Best compressed archive_command on Linux?

I am running my system with the logs going into a dated directory. Then
each night, I have a cron job that tars up the previous days directory.

Here is my script for the archive_command:
#!/bin/bash
echo "start" >> ~/archive_log_timings
date >> ~/archive_log_timings

source /home/postgres/etc/postgres.profile

## setup variables
archiveFile=$1 ## full path with filename to be archived
archiveFileName=$2 ## the file name to be archived
serverPort=$3 ## port the server is running on
serverName=`/bin/hostname` ## the name of this machine
returnValue=0 ## Set the return code to success ( 1 for
failur
e)
DATE=`/bin/date +%Y%m%d`
fullArchiveDir=`echo
${archiveBaseDir}/${serverName}/${serverPort}/pg_xlog_arch/
${DATE}`

## make sure the mount point is available
if [ ! -d $archiveBaseDir ]
then
returnValue=1
echo "`/bin/hostname` missing directory $archiveBaseDir" | mail -s "URGENT
DB
ISSUE" $DBAPAGER
sleep 300
else
## make sure the proper directory tree exists. If not build it.
mkdir -p $fullArchiveDir

## get an md5sum of the original file
originalMD5=`md5sum $archiveFile| awk '{print $1}'`

## copy of file to the new location
cp -i ${archiveFile} ${fullArchiveDir}/. < /dev/null

## get an md5sum of the copied file
copiedMD5=`md5sum ${fullArchiveDir}/$archiveFileName | awk '{print $1}'`

## see if the sums match
if [ "$originalMD5" = "$copiedMD5" ]
then

## remove the file from the current archive save directory
currentArchiveDir=`echo
${archiveBaseDir}/${serverName}/${serverPort}/curren
t_log`
rm ${currentArchiveDir}/$archiveFileName ##2>/dev/null

###bzip2 ${fullArchiveDir}/$archiveFileName
returnValue=0
else
returnValue=1
echo "`/bin/hostname` - LOG ARCHIVE FAILED - `date`" | mail -s "URGENT
DB IS
SUE" $DBAPAGER
sleep 300
fi
fi
echo "done" >> ~/archive_log_timings
date >> ~/archive_log_timings
exit $returnValue
----

Here is my tar command in cron:
cd /postgresql/<port>/pg_xlog_arch/archive/<hostname>/<port>/pg_xlog_arch/
/usr/bin/find . -type d -mtime +1 |
/bin/sort |
/bin/sed 's/\.\///' |
while read DIR
do
/bin/tar -cvzf ${DIR}.tar.gz $DIR
/bin/rm -r $DIR
done

I think the tar script could use some further refinement, but for now it
works.

Chris

On 4/11/07, Sean Murphy <Sean(dot)Murphy(at)equipoint(dot)com> wrote:
>
> I'm in the process of moving an 8.2 server from Win32 to Ubuntu Linux.
> On Win32, I implemented WAL archiving with the archive_command
> "rar a -ep -m5 -s -t -dh w:/%f.rar %p"
>
> Anyway, I'm going to use WAL archiving on the new server, and need the
> files to be compressed. My first inclination is to use
> "tar -czf /walarchive/%f.tar.gz %p > /dev/null"
>
> Before I go with that, though, I was wondering if anybody had any
> specific experience / advice with a better command, reasons why this
> command might fail zero or succeed nonzero, or additional/different
> options for tar that would yield better results.
>
> Thanks,
> Sean
>
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