Simple rsync server based on Alpine To be able to connect to this rsync server you need to add the SSH key of your client to the variable SSH_AUTH_KEY_1 How to create an SSH key? Log into your client machine and create an SSH key as follows: ssh-keygen -t rsa -b 4096 Press 3x ENTER to use the default location and create the key without password. Now display your SSH Key with the following command: cat ~/.ssh/id_rsa.pub Copy the complete line like "ssh-rsa AAA.... username@client" and paste it in the field "SSH_AUTH_KEY_1" and start this container. You can test the connection from your client as follows (replace "tower" against your server name or domain): rsync --dry-run --itemize-changes --archive -e 'ssh -p 5533' root@tower:/mnt/user/system/ /tmp