backup with truenas s3 about barman HOT 3 OPEN

We do not test against TrueNAS so I can't confirm whether what you see when omitting the region is expected behaviour.

I tried checking the endpointURL and region requirements in the TrueNAS docs but the documentation around the S3 service doesn't appear to be very comprehensive. One thing I did notice is that the S3 service in TrueNAS is deprecated and the recommended approach is now to use the Minio plugin instead.

from barman.

We use Minio plugin in the TrueNAS.
and I couldn't connect until I added a region to the s3Credentials settings.
Also very confusing is the line "Could not connect to the endpoint URL: "https://s3.dom.amazonaws.com/bucket\" in the log when I try to connect to https://truenas.dom.mycompany.com:9000/.

from barman.

I don't know exactly what is going on but s3.amazonaws.com is the default endpoint used in the boto3 library when connecting to S3, and s3.<region>.amazonaws.com is the endpoint format for non-default regions. I suspect what happens is that when the region is not specified boto3 ends up retrying using the s3.<region>.amazonaws.com address (in this case s3.dom.amazonaws.com) and therefore that is what ends up in the final error message.

If you are able to run barman-cloud-backup directly you could increase the verbosity with the -vv argument which would give you more insight into how the endpoint is being resolved.

from barman.