pg_dumpall: could not connect to database: FATAL

# vi pg_backup.config

##############################
## POSTGRESQL BACKUP CONFIG ##
##############################
 
# Optional system user to run backups as.  If the user the script is running as doesn't match this
# the script terminates.  Leave blank to skip check.
BACKUP_USER=
 
# Optional hostname to adhere to pg_hba policies.  Will default to "localhost" if none specified.
HOSTNAME="hostname"
 
# Optional username to connect to database as.  Will default to "postgres" if none specified.
USERNAME="postgres"
 
# This dir will be created if it doesn't exist.  This must be writable by the user the script is
# running as.
BACKUP_DIR=/home/backups/database/postgresql/
 
# List of strings to match against in database name, separated by space or comma, for which we only
# wish to keep a backup of the schema, not the data. Any database names which contain any of these
# values will be considered candidates. (e.g. "system_log" will match "dev_system_log_2010-01")
SCHEMA_ONLY_LIST=""
 
# Will produce a custom-format backup if set to "yes"
ENABLE_CUSTOM_BACKUPS=yes
 
# Will produce a gzipped plain-format backup if set to "yes"
ENABLE_PLAIN_BACKUPS=yes
 
# Will produce gzipped sql file containing the cluster globals, like users and passwords, if set to "yes"
ENABLE_GLOBALS_BACKUPS=yes
 
 
#### SETTINGS FOR ROTATED BACKUPS ####
 
# Which day to take the weekly backup from (1-7 = Monday-Sunday)
DAY_OF_WEEK_TO_KEEP=5
 
# Number of days to keep daily backups
DAYS_TO_KEEP=7
 
# How many weeks to keep weekly backups
WEEKS_TO_KEEP=5
 
######################################

#vi pg_backup.sh

#!/bin/bash

###########################
####### LOAD CONFIG #######
###########################
 
while [ $# -gt 0 ]; do       case $1 in               -c)                       if [ -r "$2" ]; then                               source "$2"                               shift 2                       else                               ${ECHO} "Unreadable config file \"$2\"" 1>&2                               exit 1                       fi                       ;;               *)                       ${ECHO} "Unknown Option \"$1\"" 1>&2                       exit 2                       ;;       esac
done
 
if [ $# = 0 ]; then       SCRIPTPATH=$(cd ${0%/*} && pwd -P)       source $SCRIPTPATH/pg_backup.config
fi;
 
###########################
#### PRE-BACKUP CHECKS ####
###########################
 
# Make sure we're running as the required backup user
if [ "$BACKUP_USER" != "" -a "$(id -un)" != "$BACKUP_USER" ]; thenecho "This script must be run as $BACKUP_USER. Exiting." 1>&2exit 1;
fi;
 
 
###########################
### INITIALISE DEFAULTS ###
###########################
 
if [ ! $HOSTNAME ]; thenHOSTNAME="localhost"
fi;
 
if [ ! $USERNAME ]; thenUSERNAME="postgres"
fi;
 
 
###########################
#### START THE BACKUPS ####
###########################
 
 
FINAL_BACKUP_DIR=$BACKUP_DIR"`date +\%Y-\%m-\%d`/"
 
echo "Making backup directory in $FINAL_BACKUP_DIR"
 
if ! mkdir -p $FINAL_BACKUP_DIR; thenecho "Cannot create backup directory in $FINAL_BACKUP_DIR. Go and fix it!" 1>&2exit 1;
fi;
 
 
#######################
### GLOBALS BACKUPS ###
#######################
 
echo -e "\n\nPerforming globals backup"
echo -e "--------------------------------------------\n"
 
if [ $ENABLE_GLOBALS_BACKUPS = "yes" ]
then       echo "Globals backup"
        if ! pg_dumpall -g -h "$HOSTNAME" -U "$USERNAME" | gzip > $FINAL_BACKUP_DIR"globals".sql.gz.in_progress; then               echo "[!!ERROR!!] Failed to produce globals backup" 1>&2       else               mv $FINAL_BACKUP_DIR"globals".sql.gz.in_progress $FINAL_BACKUP_DIR"globals".sql.gz       fi
elseecho "None"
fi
 
 
###########################
### SCHEMA-ONLY BACKUPS ###
###########################
 
for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ }
doSCHEMA_ONLY_CLAUSE="$SCHEMA_ONLY_CLAUSE or datname ~ '$SCHEMA_ONLY_DB'"
done
 
SCHEMA_ONLY_QUERY="select datname from pg_database where false $SCHEMA_ONLY_CLAUSE order by datname;"
 
echo -e "\n\nPerforming schema-only backups"
echo -e "--------------------------------------------\n"
 
SCHEMA_ONLY_DB_LIST=`psql -h "$HOSTNAME" -U "$USERNAME" -At -c "$SCHEMA_ONLY_QUERY" postgres`
 
echo -e "The following databases were matched for schema-only backup:\n${SCHEMA_ONLY_DB_LIST}\n"
 
for DATABASE in $SCHEMA_ONLY_DB_LIST
doecho "Schema-only backup of $DATABASE"
 if ! pg_dump -Fp -s -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" | gzip > $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz.in_progress; then	echo "[!!ERROR!!] Failed to backup database schema of $DATABASE" 1>&2else	mv $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz.in_progress $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gzfi
done
 
 
###########################
###### FULL BACKUPS #######
###########################
 
for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ }
doEXCLUDE_SCHEMA_ONLY_CLAUSE="$EXCLUDE_SCHEMA_ONLY_CLAUSE and datname !~ '$SCHEMA_ONLY_DB'"
done
 
FULL_BACKUP_QUERY="select datname from pg_database where not datistemplate and datallowconn $EXCLUDE_SCHEMA_ONLY_CLAUSE order by datname;"
 
echo -e "\n\nPerforming full backups"
echo -e "--------------------------------------------\n"
 
for DATABASE in `psql -h "$HOSTNAME" -U "$USERNAME" -At -c "$FULL_BACKUP_QUERY" postgres`
doif [ $ENABLE_PLAIN_BACKUPS = "yes" ]then	echo "Plain backup of $DATABASE"
 	if ! pg_dump -Fp -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" | gzip > $FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress; then		echo "[!!ERROR!!] Failed to produce plain backup database $DATABASE" 1>&2	else		mv $FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress $FINAL_BACKUP_DIR"$DATABASE".sql.gz	fifi
 if [ $ENABLE_CUSTOM_BACKUPS = "yes" ]then	echo "Custom backup of $DATABASE"
 	if ! pg_dump -Fc -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" -f $FINAL_BACKUP_DIR"$DATABASE".custom.in_progress; then		echo "[!!ERROR!!] Failed to produce custom backup database $DATABASE" 1>&2	else		mv $FINAL_BACKUP_DIR"$DATABASE".custom.in_progress $FINAL_BACKUP_DIR"$DATABASE".custom	fifi
 
done
 
echo -e "\nAll database backups complete!"