From a86b50bc454677d66abb27aef1b50d2686d3a577 Mon Sep 17 00:00:00 2001
From: "Hahn Axel (hahn)" <axel.hahn@unibe.ch>
Date: Fri, 13 Dec 2024 13:28:05 +0100
Subject: [PATCH] postgres db backup uses a snapshot db
---
plugins/localdump/pgsql.sh | 40 +++++++++++++++++++++++++++++++-------
1 file changed, 33 insertions(+), 7 deletions(-)
diff --git a/plugins/localdump/pgsql.sh b/plugins/localdump/pgsql.sh
index 219550a..0fb225d 100755
--- a/plugins/localdump/pgsql.sh
+++ b/plugins/localdump/pgsql.sh
@@ -14,6 +14,7 @@
# 2022-03-17 v1.3 WIP: add lines with prefix __DB__
# 2023-09-20 v1.4 FIX could not change directory to "/root": Permission denied
# 2024-10-02 ah v1.5 rename backup and restore function
+# 2024-12-13 ah v1.6 backup uses a snapshot db
# ================================================================================
if [ -z "$BACKUP_TARGETDIR" ]; then
@@ -34,9 +35,14 @@ fi
# FUNCTION
# --------------------------------------------------------------------------------
-
+# backup all databases
function pgsql.backup(){
+ local DATABASE
+ local SNAPSHOTDB
+ local OUTFILE
+ local snapshotprefix="snapshot_"
+
create_targetdir
# ----- change owner of directory because of su command
@@ -45,24 +51,44 @@ function pgsql.backup(){
# ----- GO
# prevent could not change directory to "/root": Permission denied
+ (
cd /tmp
+
sSqlGetDblist="select datname from pg_database where not datistemplate and datallowconn order by datname;"
- for DATABASE in $(su ${PGUSER} -c "psql ${BACKUP_PARAMS} -At -c '$sSqlGetDblist' postgres" 2>/dev/null)
+ for DATABASE in $( su ${PGUSER} -c "psql ${BACKUP_PARAMS} -At -c '$sSqlGetDblist' postgres" 2>/dev/null | grep -v "^$snapshotprefix" )
do
echo -n "__DB__${SERVICENAME} backup $DATABASE ... "
+ SNAPSHOTDB="${snapshotprefix}${DATABASE}"
OUTFILE="${BACKUP_TARGETDIR}/$(get_outfile ${DATABASE}).sql"
- if su ${PGUSER} -c "pg_dump ${BACKUP_PARAMS} -Fp ${DATABASE} >$OUTFILE"; then
- fetchrc >/dev/null
- db._compressDumpfile "$OUTFILE"
+
+ echo -n " snapshot ... "
+ # drop snapshot db first - just in case
+ su ${PGUSER} -c "dropdb ${SNAPSHOTDB}" >/dev/null 2>&1
+ su ${PGUSER} -c "psql ${BACKUP_PARAMS} -c \"CREATE DATABASE ${SNAPSHOTDB} WITH TEMPLATE ${DATABASE};\"" >/dev/null
+ fetchrc >/dev/null
+ if [ $myrc -eq 0 ]; then
+
+ echo -n "backup ... "
+ if su ${PGUSER} -c "pg_dump ${BACKUP_PARAMS} -Fp ${SNAPSHOTDB} >$OUTFILE"; then
+ fetchrc >/dev/null
+ echo -n "delete snapshot ... "
+ su ${PGUSER} -c "dropdb ${SNAPSHOTDB}"
+
+ db._compressDumpfile "$OUTFILE"
+ else
+ fetchrc
+ su ${PGUSER} -c "dropdb ${SNAPSHOTDB}"
+ fi
else
- fetchrc
+ cecho error "ERROR!"
fi
done
- cd -
+ )
}
+
# restore database dump file into database
# param string database dump file (gzipped)
# param string optional: database to import; default: database is parsed from file
--
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