Hi Pepe,
It seems your are using os user for taking the backup.
When you run command line commands against the postgres database and they ask for the user and password that is the database user postgres
and its associated password, so when you do something like: psql -d template1 -U postgres the password you will be prompted for is your_db_user password
and its associated password, so when you do something like: psql -d template1 -U postgres the password you will be prompted for is your_db_user password
Now the above also depends on what is set in pg_hba.conf for the various combinations of host, database, user and auth_method.
For more information see https://www.postgresql.org/docs/9.5/static/client-authentication.html
On Mon, Feb 25, 2019 at 10:21 PM Pepe TD Vo <pepevo@xxxxxxxxx> wrote:
good morning Expert DBAs,I created a script to do backup and I have faced the error ofPerforming globals backup:pg_dumpall: could not connect to database "template1":FATAL: Ident authentication failed for user "postgres" fro globals backup. As same as performing schema-only backups and full backup.Performing schema-only backup:psql:FATAL: Ident authentication failed for user "postgres"the following databases were matched for schema-only backup:performing full backup:psql:FATAL: Ident authentication failed for user "postgres"I can run pg_dumpall > postgresdump.sql as postgres user os but couldn't run from script even the script declared BACKUP_USER=postgresIf I take the syntax, -h "$HOSTNAME" -U "$USERNAME" out and the backup script working fine# 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 #######################################!/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" ]; then echo "This script must be run as $BACKUP_USER. Exiting." 1>&2 exit 1; fi; ########################### ### INITIALISE DEFAULTS ### ########################### if [ ! $HOSTNAME ]; then HOSTNAME="localhost" fi; if [ ! $USERNAME ]; then USERNAME="postgres" fi; ########################### #### START THE BACKUPS #### ########################### FINAL_BACKUP_DIR=$BACKUP_DIR"`date +\%Y-\%m-\%d`/" echo "Making backup directory in $FINAL_BACKUP_DIR" if ! mkdir -p $FINAL_BACKUP_DIR; then echo "Cannot create backup directory in $FINAL_BACKUP_DIR. Go and fix it!" 1>&2 exit 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 else echo "None" fi ########################### ### SCHEMA-ONLY BACKUPS ### ########################### for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ } do SCHEMA_ONLY_CLAUSE="$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 do echo "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>&2 else mv $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz.in_progress $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz fi done ########################### ###### FULL BACKUPS ####### ########################### for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ } do EXCLUDE_SCHEMA_ONLY_CLAUSE="$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` do if [ $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 fi fi 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 fi fi done echo -e "\nAll database backups complete!"I'm appreciate if anyone know how to correct this?thank you.v/r,Bach-Nga
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