barman PostgreSQL: FAILED - database

Question

I am in the process of setting up a database backup system using Barman.
My database is a postgreSQL db.
When I run
barman check main-db
I get the following error:
PostgreSQL: FAILED
directories: OK
retention policy settings: OK
backup maximum age: FAILED (interval provided: 1 day, latest backup age: No available backups)
compression settings: OK
minimum redundancy requirements: OK (have 0 backups, expected at least 0)
ssh: OK (PostgreSQL server)
not in recovery: OK
The code I'm using in my barman.conf:
ssh_command = ssh postgres#10.0.0.XX
conninfo = host=10.0.0.XX user=YYYYYYY dbname=ZZZZZZZZ
retention_policy_mode = auto
retention_policy = RECOVERY WINDOW OF 7 days
wal_retention_policy = main
Any help would be greatly appreciated

Answer 1

The barman check output contains two errors, the first one is critical:
PostgreSQL: FAILED
It means that your barman user cannot connect with PostgreSQL using the credentials you provided in the conninfo parameter.
You can try it yourself by becoming the barman user and executing psql passing the content of conninfo as the only argument (it requires PostgreSQL clients installed on the server):
psql 'host=10.0.0.XX user=YYYYYYY dbname=ZZZZZZZZ'
It must connect to the target PostgreSQL servers without asking for any password.
The backup maximum age error is normal because you don't have any backup. However, it is not a blocking one, so it will not prevent you from taking your first backup.

Answer 2

This issue has now been resolved.
I solved this issue by ensuring that conninfo= had all the correct information. (Including password= field)

Answer 3

I think you deleted your barman user from PostgreSQL or you recreated that PostgreSQL cluster using postgresql-12-setup initdb command. Either you recover from old backup or you can do follow below steps.
postgres#pg$ createuser -s -P barman
postgres#pg$ psql
GRANT EXECUTE ON FUNCTION pg_start_backup(text, boolean, boolean) to barman;
GRANT EXECUTE ON FUNCTION pg_stop_backup() to barman;
GRANT EXECUTE ON FUNCTION pg_stop_backup(boolean, boolean) to barman;
GRANT EXECUTE ON FUNCTION pg_switch_wal() to barman;
GRANT EXECUTE ON FUNCTION pg_create_restore_point(text) to barman;
GRANT pg_read_all_settings TO barman;
GRANT pg_read_all_stats TO barman;
For streaming backup, you need to create streaming connection.
postgres#pg$ createuser -P --replication streaming_barman
Next update your pg_hba.conf file with your granted ip address.