Migrating hidden services from Java I2P - PurpleI2P/i2pd GitHub Wiki
If you run hidden service(s) with Java I2P and chose to switch to i2pd, this instruction is for you.
Each I2P hidden service has a Private key file associated with it. Those files are located in Java I2P data directory, usually in ~/.i2p. You'll need to copy those files to i2pd data directory ~/.i2pd and add related entries to i2pd tunnel configuration file ~/.i2pd/tunnels.conf.
Look for Private key file in Java I2P tunnel webapp to know which files you'll need to move.
I.e. let's say your private key file from Java I2P is ~/.i2p/my-eepsite.dat
Copy ~/.i2p/my-eepsite.dat to ~/.i2pd/ directory
Add a new entry to ~/.i2pd/tunnels.conf (create the file if it's not there).
[eepsite-on-i2pd]
type=http
host=127.0.0.1
port=8080
keys=my-eepsite.dat
This example is for HTTP server tunnel pointing at your website at 127.0.0.1:8080.