¶ Usefull
rsync -ah --progress /mnt/test/mnt/all/all/services/media/series/ /mnt/user/services/media/series/
Check ports in Use
sudo netstat -tunlp
¶ How to Connect to SSH Without a Password
¶ 1. Connect to Remote Machine
ssh remote_username@remote_server_ip_address
¶ 2. Generate Private and Public Keys
ssh-keygen
Press “Enter” three times until the command finishes. A public key file “~/.ssh/id_rsa.pub” and a private key file “~/.ssh/id_rsa” will be generated.
¶ 3. Copy the Public Key File to the Remote Machine
ssh-copy-id remote_username@remote_server_ip_address
¶ 4. Done, Test 
ssh remote_username@remote_server_ip_address
¶ Gravity-Sync Pihole
¶ Installation Script
Open an SSH session to each Pi-hole, and execute the following script.
curl -sSL https://raw.githubusercontent.com/vmstan/gs-install/main/gs-install.sh | bash
¶ Configuration
If you do not have an existing configuration file, the installer will prompt to create one. It can also be run later by executing gravity-sync config
¶ Automation
Automation of sync is accomplished by adding an execution of the script to each host's systemd configuration.
gravity-sync auto
gravity-sync auto quad for quarter-hour intervals.