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Rsync server was working successfully on my RPi B+ until today. I've upgraded the attached USB from 32 GB to 64 GB (both USB 3.0). Then I got reckless and changed a bunch of settings for the Samba Rsync server too. Now it does work if I manually start the daemon by running

sudo rsync --daemon

But not when booting the RPi. When I set RSYNC_ENABLE to true in /etc/default/rsync, nothing is logged in /var/log/rsyncd.log when booting, so I assume it is not running. When I set RSYNC_ENABLE to inetd I see the following error in the log

error [720] rsync error: received SIGINT, SIGTERM, or SIGHUP (code 20) at rsync.c ..

I occasionally get this error when starting the daemon manually. I suspect this error to be caused by the fact that the USB is not yet ready. When the daemon is successfully running, I can see the backup module from another computer, so that should rule out many possible problems I assume.

So, overall a lot of assuming and fiddling around. I hope someone can point me in the right direction.

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Solved it by adding the line @reboot rsync --daemon to crontab (sudo crontab -e).

The error was caused by a full file system. I thought that I was writing to an USB when writing to /mnt/cruzer, but the USB was not mounted at start. So I was actually writing to the SD card. I could have saved myself a lot of trouble if I checked df more often. This lists the used file systems and space.

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