Passwordless login

To synchronize data to a remote server using RsyncUI, passwordless login via SSH key authentication is required. RsyncUI does not support password-based authentication during data synchronization. SSH key authentication is generally considered more secure than password-based authentication.

If default values for RSA-based SSH key authentication are used, no additional information about the SSH key is required in RsyncUI. However, it is necessary to provide information if a custom SSH keypath, identity file, or port number is used.

The SSH keypath and identity file are specified as follows:

-e "ssh -i ~/.keypath/identityfile -p NN"

where:

• -i ~/.keypath/identityfile is the SSH keypath and identity file
• -p NN is the port number used for communication (default port 22)

To use custom SSH key and keypath data, add the following information to RsyncUI in the settings:

To configure the SSH keypath and identity file, refer to the user configuration in the SSH settings. When enabling a custom SSH keypath and identity file, please ensure they follow this format:

~/.mynewsshdirectory/mynewkey

For example:

~/.ssh_rsyncosx/rsyncosx

The path must start with ~ followed by /. RsyncUI will verify that the SSH keypath begins with ~ and contains at least two forward slashes (/) before saving the new SSH keypath.

The rsync command to synchronize my Documents directory to my Raspberry Pi server is set by RsyncUI as:

/opt/homebrew/bin/rsync --archive --verbose --compress \
-e "ssh -i ~/.ssh_rsyncosx/rsyncosx -p 22" --stats \
/Users/thomas/Documents/ thomas@raspberrypi:/backups/Documents/

For more information on passwordless login, please refer to the Tools for passwordless login section.