[ 1 ] Connect to the node over ssh and make sure you are under /home/umbrel.
[ 2 ] Create the charge-lnd config/policy file. I named mine charge-lnd.pol.
Add the following contents in it:
[default]
# 'default' is special, it is used if no other policy matches a channel
strategy = static
#zerobasefee for Pickhardt Payments
base_fee_msat = 0
fee_ppm = 1
[proportional]
# 'proportional' can also be used to auto balance (lower fee rate when low remote balance & higher rate when higher remote balance)
# fee_ppm decreases linearly with the channel balance ratio (min_fee_ppm when ratio is 1, max_fee_ppm when ratio is 0
strategy = proportional
min_fee_ppm = 1
max_fee_ppm = 25[ 3 ] Create the script that will be invoked by the cron job defined at step [4]. I named mine charge-lnd-cron.sh.
Add the following contents in it:
#!/bin/sh
ln_shell=$(docker ps | grep lightning-shell | awk '{print $1}')
docker cp /home/umbrel/charge-lnd.pol $ln_shell:/home/lnshell
docker exec $ln_shell /home/lnshell/.local/bin/charge-lnd -c /home/lnshell/charge-lnd.pol[ 3.1 ] Make the script executable by running the following command:
chmod +x charge-lnd-cron.sh[ 4 ] Add the following cron entry on the umbrel node:
*/2 * * * * /home/umbrel/charge-lnd-cron.sh