RE: Postgres 13 streaming replication standby not sending password, 'fe_sendauth: no password supplied'

On Wed, Jan 10, 2024 at 23:22 Ron Johnson <ronljohnsonjr(at)gmail(dot)com> wrote:
>> On Wed, Jan 10, 2024 at 5:51 PM Keaney, Will <will(dot)keaney(at)kroger(dot)com> wrote:
>> Hello,
>>
>> I'm building a new 2-node Postgreql 13 streaming replication cluster. I'm able to clone the primary to the standby using pg_basebackup.
>> However, the standby is unable to authenticate to the primary to begin recovery during startup. It logs an error, "FATAL: could not connect to the primary server: fe_sendauth: no password supplied".
>>
>> I've tried using both .pgpass and passing the password explicitly in the myrecovery.conf primary_conninfo string. Debug logs on the primary show the initial connection. but no user provided and no authentication attempt.
>>
>> pg_hba.conf on the primary:
>> host all,replication repl primary-database-server scram-sha-256
>> host all,replication repl standby-database-server scram-sha-256
>>
>> myrecovery.conf on the standby:
>> primary_conninfo = 'host=primary-database-server port=5432 user=repl application_name=standby-server-name'
>> recovery_target_timeline = 'latest'
>> primary_slot_name = 'standby_replication_slot'
>>
>> .pgpass on the standby:
>> # hostname:port:database:username:password
>> *:*:replication:repl:repl_user_password
>>
>> I've triple-checked that the password in .pgpass matches the password set for the repl user in the database, and the repl user has REPLICATION access.
>> I'm able to connect to the primary server using the repl user and the psql client, both via .pgpass and providing the password directly.
>> I can't figure out why the standby postgres server is skipping the provided credentials when connecting to the primary.
>>
> Let pg_basebackup do all the work for you:
>
> $ cat ~postgres/.pg_service.conf
> [basebackup]
> host=<primary-server>
> port=5432
> user=replicator
> passfile=/var/lib/pgsql/.pgpass
>
> $ pg_basebackup \
> --pgdata=$PGDATA \
> --dbname=service=basebackup \
> --verbose --progress \
> --checkpoint=fast \
> --write-recovery-conf \
> --wal-method=stream \
> --create-slot --slot=pgstandby1

Thank you! That's both extremely useful and helped me identify the source of my problem.
A previous experiment with repmgr had left a stale primary_conninfo string in postgresql.auto.conf, which was somehow interfering with my other recovery settings.
After cleaning that up, my standby can connect to my primary without issue.

Best,
Will

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