Alternate Ports for bitcoind and lnd

[jagottsicher]

If you run several RapsiBlitz in the same network behind a NAT firewall you want to forward ports, respectively use port triggering to lead the right data to particular nodes.

For that it was nice to have the option to change the ports bitcoind and lnd are listening to.

Also I would like to see an option to add additional ports opened in the firewall (ufw) before the reboot.

I could imagine both features in the main menu under "advanced" OR in the setup scripts before setup of the nodes, respectively before the firewall is enabled.

[jagottsicher]

I just edited the lnd.conf in /mnt/hdd/lnd/ (the symlink from .lnd of bitcoin's home) and /home/admin/
and added

`# On all ipv4 interfaces on port 19735 and ipv6 localhost port 19736:
#listen=0.0.0.0:19735
#listen=[::1]:19736` 

But after reboot the infoscreens both on the device and via ssh show still 9735 as port. This is not only a display error also
lncli getinfo
shows 9735 as port.

Is the start with port 9735 "hardwired" in the call of lnd?
That should be changed.

[rootzoll]

The port displayed should be the one one from lncli getinfo / uris. Changing the port over the UI should be a future option. I never changed it, so experience here. Why lnd is not picking up the changed port you may get an answere at the LND Dev Slack.

[ppachur]

The reason is that the frontend is running the command as a different user (admin instead of bitcoin), thus grabbing different configuration (lncli appears to directly access the config file and does not ask the server).

I'll make a PR later.

[CryptoCloaks]

We have found a solution to this, that hopefully works for everyone!

1. Login to your node and get to the console

2. We will open the new port that is wanted in the firewall with (For our case, we wanted port 9736)
   sudo ufw allow 9736 comment 'lightning mainnet'
sudo ufw --force enable

3. Next we will add a listening port to our lnd.conf
   sudo nano /home/admin/.lnd/lnd.conf

We will now add two new lines: (For XXX.XXX.XXX.XXX, please replace with your external IP)
listen=0.0.0.0:9736
externalip=XXX.XXX.XXX.XXX:9736

4. Save and exit File
   CTRL + O
   CTRL + X

Now we will add these to one more file, to cover all the bases:
sudo nano /home/bitcoin/.lnd/lnd.conf

We will now add two new lines: (For XXX.XXX.XXX.XXX, please replace with your external IP)
listen=0.0.0.0:9736
externalip=XXX.XXX.XXX.XXX:9736

5. Save and exit File
   CTRL + O
   CTRL + X

Now the fun part!

6. Stop lnd
   sudo systemctl stop lnd

7. We will then disable lnd
   sudo systemctl disable lnd

8. Now we will edit the lnd.service file
   sudo nano /etc/systemd/system/lnd.service

9. Once the file is open look for
   ExecStart=/usr/local/bin/lnd --externalip=${publicIP}

When you have found that line, we will add the port we want to start using instead of the default 9735 to the end like so (In our case we used 9736)
ExecStart=/usr/local/bin/lnd --externalip=${publicIP}:9736

10. We will save the file
    CTRL + O

11. We will exit the file
    CTRL + X

12. We will enable the lnd service again
    sudo systemctl enable lnd

13. Now we will shutdown and restart the RaspiBlitz to have our changes go into effect.
    sudo shutdown -r now

14. Verify changes have been made with:
    lncli getinfo

15. You should now see your uris has changed! SUCCESS!
    

[rootzoll]

To setup this on a fresh raspiblitz - also I think in /mnt/hdd/lnd/lnd.conf the entry listen=0.0.0.0:9736is needed and a firewall port needs to be open on 9736:
sudo ufw allow 9736 comment 'lightning mainnet'
sudo ufw --force enable

[CryptoCloaks]

I will edit the post above.

[rootzoll]

I am adding this to 1.1 release milestone ... as an idea for a script in /home/admin/config.scripts/lnd.setport.sh that simply takes the port number as parameter and executes the needed changes automatically :)