How to synchronize placeholders across servers

1: Fill the connection informations form

# If this is not enabled will be used local placeholders
enabled: false
# The main server is the server from the placeholders are copied
main: false
# Database information
port: 3306
username: "root"
password: "" # Leave empty if none
database: "rocketplaceholders"

2: Choose a main server

Remember to chose a main server, all placeholders are copied from it.
See here.

3: (Re)Start the server

See the faq for more informations