Truenas Replication Error

[Leonard Lassen]

Hi,
i have a problem with my replication Task. I have two Servers On the first is running a Nextcloud Plugin which I want to Backup on the second server. When I Start the Replication Task on Server one to create a backup on the second I got this error:

cannot open 'Nextcloud Backup': dataset does not exist.
Logs
[2021/01/14 06:26:55] INFO [Thread-20] [zettarepl.paramiko.replication_task__task_1] Connected (version 2.0, client OpenSSH_8.2-hpn14v15)
[2021/01/14 06:26:55] INFO [Thread-20] [zettarepl.paramiko.replication_task__task_1] Authentication (publickey) successful!
[2021/01/14 06:26:55] INFO [replication_task__task_1] [zettarepl.replication.run] No snapshots to send for replication task 'task_1' on dataset 'nextcloud'
[2021/01/14 06:26:55] ERROR [replication_task__task_1] [zettarepl.replication.run] For task 'task_1' unhandled replication error DatasetDoesNotExistException(1, "cannot open 'Nextcloud Backup': dataset does not exist\n")
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/zettarepl/replication/run.py", line 154, in run_replication_tasks
run_replication_task_part(replication_task, source_dataset, src_context, dst_context, observer)
File "/usr/local/lib/python3.8/site-packages/zettarepl/replication/run.py", line 239, in run_replication_task_part
mount_dst_datasets(dst_context, target_dataset, replication_task.recursive)
File "/usr/local/lib/python3.8/site-packages/zettarepl/replication/run.py", line 674, in mount_dst_datasets
dst_datasets = list_datasets_with_properties(dst_context.shell, dst_dataset, recursive, {
File "/usr/local/lib/python3.8/site-packages/zettarepl/dataset/list.py", line 30, in list_datasets_with_properties
output = shell.exec(args)
File "/usr/local/lib/python3.8/site-packages/zettarepl/transport/zfscli/exception.py", line 29, in __exit__
raise DatasetDoesNotExistException(exc_val.returncode, exc_val.stdout) from None
zettarepl.transport.zfscli.exception.DatasetDoesNotExistException: cannot open 'Nextcloud Backup': dataset does not exist

can someone help me?

Best regards Leonard

 

[Patrick M. Hausen]

Please post the complete configuration of your replication task.

 

[Leonard Lassen]

this is my config

 

[Patrick M. Hausen]

For source you should not pick the entire pool and the nextcloud/iocage dataset but just the latter - nextcloud/iocage - and check the "recursive" mark. Assuming you want to backup your jail and the data in it.

Second, does the target dataset exist? I have not tried if you can give the system a top level pool name as the target, but possibly not. Create a dataset named "backup" or similar on your second system and try to use that as the replication target.

 

[Leonard Lassen]

where should I add the dataset? under mnt?

No I didnt think so then I cant add the pool to the plugins on the second server I get there an error.

 

[Patrick M. Hausen]

No, under /mnt/your-pool-name ... You need a target dataset in your pool.

 

[Leonard Lassen]

Okay, I created an new Dataset but it doesnt show me the dataset

 

[Leonard Lassen]

Truenas saays me that the dataset Nextcloud backup which is my pool doesnt exists

 

[Patrick M. Hausen]

Possibly you cannot have a space character in your pool name. Just guessing at the moment ...

 

[Leonard Lassen]

okay how can I change that should I change that over ftp?

 

[Patrick M. Hausen]

This is a new system, right? Destroy pool, create new.

 

[Leonard Lassen]

yes its a new system how can I destroy the pool?

 

[Patrick M. Hausen]

Storage --> Pools --> Export/disconnect

 

[Leonard Lassen]

I got it sorry I had been not sure. should I choose as destination path also iocage or what should I do?

 

[Patrick M. Hausen]

You can use iocage as long as you never want to run a jail/plugin on that target system unless your main system fails.
The target dataset and all child datasets must remain in read-only state for the replication to work. In case your main system breaks you can manually remove the read-only property and then start your Nextcloud jail ...

 

[Leonard Lassen]

No he is running as a backupserver more not. How can I put it in read only?

 

[Leonard Lassen]

I think that this configuration will work

 

[Patrick M. Hausen]

How can I put it in read only?

Don't worry - the replication job will do that:

 

[Leonard Lassen]

I startet the replication everything is working thank you! but as the task was done the second server doesnt show me the plugin

 

[Patrick M. Hausen]

Are the datasets all there? If yes, everything is fine. As I said you cannot run this as a plugin without breaking replication. This is not a high availability configuration but a backup.

You can try iocage activate poolname. If that does not work because of the read-only dataset, it should be possible to just replicate iocage/jails recursively into iocage/jails and leave the top-level iocage read-write.