Re: pg_dumpall: could not connect to database: FATAL

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
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

Thanks & Regards,
*Shreeyansh DBA Team*
www.shreeyansh.com

On Mon, Feb 25, 2019 at 10:21 PM Pepe TD Vo <pepevo(at)yahoo(dot)com> wrote:

> good morning Expert DBAs,
>
> I created a script to do backup and I have faced the error of
>
> Performing 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=postgres
>
>
> If 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 backupsDAYS_TO_KEEP=7
> # How many weeks to keep weekly backupsWEEKS_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
> ;;
> esacdone
> if [ $# = 0 ]; then
> SCRIPTPATH=$(cd ${0%/*} && pwd -P)
> source $SCRIPTPATH/pg_backup.configfi;
> ############################### PRE-BACKUP CHECKS ###############################
> # Make sure we're running as the required backup userif [ "$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
> fielse
> 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_LISTdo
> 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
> fidone
>
> ################################# 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*No one in this world is pure and perfect. If you avoid people
> for their mistakes you will be alone. So judge less, love and forgive more.
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> (Hermione Gingold)
>
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>