Rsync over SSH to Digital Ocean Droplet

Question

Hi, when stting up a backup job I am struggling to get my Ultra6 to connect to my remote Digital Ocean Droplet , so it can download ald locally store backups from there.

I have added the SSH public key given to me by ReadyNAS to Digital Ocean SSH keys (copy-pasting in to the 'add new SSH key dialog in Digital Ocean Dashboard from the publick key txt file that ReadyNAS generated) and have given that key the name 'ReadyNAS' (just for originality)

When in ReadyNAS backup I then try to connect to the domain on the host, using method Rsync over SSH, and username 'ReadyNAS', I always get error:

Permission denied (publickey).
rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
rsync error: unexplained error (code 255) at io.c(235) [Receiver=3.1.3]

I have tried using the server IP address rather than domain as the source, and using username 'root', and even powercycling the server - but none of these seemed to help.

What might I be doing wrong?

*** Edit

Logging in to server via SSH using PuTTy, to check if SSH service is running using:

sudo service ssh status

I can see my connection attempts, but that a different port is being tried each time, and none of these are the port 22 I actually set in ReadyNAS.

Jan 21 06:53:57 nz sshd[3628]: Connection closed by invalid user ReadyNAS (my ReadyNAS static IP) port 40214 [preauth]
Jan 21 06:53:58 nz sshd[3653]: Invalid user ReadyNAS from (my ReadyNAS static IP) port 40216
Jan 21 06:53:59 nz sshd[3653]: Connection closed by invalid user ReadyNAS (my ReadyNAS static IP) port 40216 [preauth]

etc

Does this offer any clues?

StephenB · Answer

ArchPrime&nbsp;wrote:
I can see my connection attempts, but that a different port is being tried each time, and none of these are the port 22 I actually set in ReadyNAS.

I think you are seeing the source port in the status, and not the destination port.
&nbsp;
ArchPrime&nbsp;wrote:
&nbsp;
I have added the SSH public key given to me by ReadyNAS to Digital Ocean SSH keys (copy-pasting in to the 'add new SSH key dialog in Digital Ocean Dashboard from the public key txt file that ReadyNAS generated)&nbsp; and have given that key the name 'ReadyNAS' (just for originality)

Perhaps try running rsync manually from the NAS using ssh.&nbsp; Log in as root on the NAS.&nbsp; DigitalOcean does have a tutorial here:&nbsp;https://www.digitalocean.com/community/tutorials/how-to-copy-files-with-rsync-over-ssh&nbsp;but it runs in the other direction (assuming you are logged into the origin server, and you are logging into the destination server).
&nbsp;
FWIW, it appears that you might not have an account with the username ReadyNAS set up on the DigitialOcean server.
&nbsp;

ArchPrime · Answer

Hi thanks - looks like you were on to something with missing 'ReadyNAS' account.

I tried and apparently succeeded in adding an account by this name in Linux, but still no luck - but when I tried logging in as 'root' instead from ReadyNAS, the connection tested as ok. However I was not able to browse for the source directory (browse button was greyed out)

Manually enetering the source path, then running a backup it looks like remote directory and contents were found, but copying failed; giving 'Disk quota exceeded (122)' error.

The selected directory to sync contains only 90mb, and to my knowledge I have not set any quotas at source or destination.

Where is this error likely comming from?

One possibly relevent clue - when I use PuTTY to acess the Digital Ocean droplet server as root, I have to supply a pass phrase related to my root SSH key to log in . Supplying of passphrases does not even seem to be an option from ReadyNAS. Does this sound relevent?

StephenB · Answer

ArchPrime&nbsp;wrote:
Hi thanks - looks like you were on to something with missing 'ReadyNAS' account.&nbsp;
&nbsp;
I tried and apparently succeeded in adding an account by this name in Linux, but still no luck - but when I tried logging in as 'root' instead from ReadyNAS, the connection tested as ok.&nbsp; However I was not able to browse for the source directory (browse button was greyed out)

To be clear, I think this account is needed on the Digital Ocean server, not the NAS.&nbsp; The key also needs to be connected to this account. (that is, placed into the account's ~/.ssh/authorized_keys).
&nbsp;
ArchPrime&nbsp;wrote:
One possibly relevent clue - when I use PuTTY to acess the Digital Ocean droplet server as root, I have to supply a pass phrase related to my root SSH key to log in .&nbsp; Supplying of passphrases does not even seem to be an option from ReadyNAS.&nbsp; Does this sound relevant?

Could be.&nbsp; Have you checked the service status on the server when you are using root?
sudo service ssh status
&nbsp;
ArchPrime&nbsp;wrote:
&nbsp;
Manually entering the source path, then running a backup it looks like remote directory&nbsp; and contents were found, but&nbsp;copying failed; giving 'Disk quota exceeded (122)' error.
&nbsp;
The selected directory to sync contains only 90mb, and to my knowledge I have not set any quotas at source or destination.
&nbsp;
Where is this error likely coming from?

You were copying to the ReadyNAS?&nbsp; If so, what was the destination path?
&nbsp;
&nbsp;

ArchPrime · Answer

Thanks Stephen&nbsp;I set up 'ReadNAS' as a username on the Digital Ocean Server (I think) but may not have pulled this off correctly&nbsp; - certianly did not manage to connect to the server from the ReadyNAS device using this user name.&nbsp; (I should probably have picked a different name to avoid confusion!).&nbsp; Not all of the instructions for adding a new user account that I found online worked as described&nbsp;I&nbsp; gave up on that and ended up adding the ReadyNAS device's ssh public key to the authorized_keys file on the Digital Ocean server for my root account - which at least now allows me to connect as as user 'root' from my ReadyNAS device,&nbsp; Even if I can get no further.&nbsp;Yes, I am trying to initiate a connection from ReadyNAS device, in order to retrieve the contents of a folder on the Digital Ocean server and save a copy of these to ReadyNAS shared folder&nbsp;&nbsp;*** EDIT ***While I was typing this response, it seems the problem has somehow self corrected - I had set up backup interval to once per day, and it so happened that this backup just executed itself automatically, and succeeded!&nbsp; I have no idea why it failed when initiated manually before.&nbsp;I wonder if being simultaneously logged in as root from my PC via PuTTY helped in some way, or issuing that&nbsp; check status command you suggested somehow&nbsp; shook something loose?:&nbsp;sudo service ssh status&nbsp;Either way, much appreciate your help!

StephenB · Answer

ArchPrime&nbsp;wrote:
&nbsp;
While I was typing this response, it seems the problem has somehow self corrected - I had set up backup interval to once per day, and it so happened that this backup just executed itself automatically, and succeeded!&nbsp; I have no idea why it failed when initiated manually before.
&nbsp;

That is mysterious (not sure how it would resolve a quota error), but if it is working, then all is well.&nbsp; You should manually check the destination folder on the NAS, just to make sure everything is ok.
&nbsp;
If you are doing incremental backups, you can combine this with custom snapshots on the destination share to give you some retention (ability to roll back to previous versions).&nbsp; There is a setting there to only make snapshots when there are changes.&nbsp;
&nbsp;
Note there is also an option in the advanced settings that will delete files on the destination (readynas) when they are deleted in the source (digitalocean).&nbsp; I use that option for my own backups (together with the custom snapshots).&nbsp; Then the main share has the same contents as the source, with older files (deleted, renamed, etc) saved in the snapshots.

Forum Discussion

Rsync over SSH to Digital Ocean Droplet

6 Replies

Related Content

RSYNC Failure

An odd RSYNC problem

PLP2000 et My Cloud Western Digital ?

Rsync not syncing

Routerlogin.net digital certificate expired

NETGEAR Academy

ProSupport for Business