Compact the LND database (channel.db)

An over 1GB channel.db file does not work on 32bit systems: https://github.com/lightningnetwork/lnd/issues/4811​
# check the size of channel.db
sudo du -h /mnt/hdd/lnd/data/graph/mainnet/channel.db
# example output
# 1.0G    /mnt/hdd/lnd/data/graph/mainnet/channel.db
Auto-compact on restart
Since LND v0.12.0 can set db.bolt.auto-compact=true in the lnd.conf.
To edit:  
sudo nano /mnt/hdd/lnd/lnd.conf
insert the following (can leave out the comments):
 [bolt]
 # Whether the databases used within lnd should automatically be compacted on
 # every startup (and if the database has the configured minimum age). This is
 # disabled by default because it requires additional disk space to be available
 # during the compaction that is freed afterwards. In general compaction leads to
 # smaller database files.
 db.bolt.auto-compact=true
 # How long ago the last compaction of a database file must be for it to be
 # considered for auto compaction again. Can be set to 0 to compact on every
 # startup. (default: 168h)
 # db.bolt.auto-compact-min-age=0
restart lnd:  
sudo systemctl restart lnd
monitor the process (can take several minutes):
sudo tail -fn 30 /mnt/hdd/lnd/logs/bitcoin/mainnet/lnd.log
might want to disable the auto-compact in lnd.conf and only activate on-demand to avoid long startup times:
 db.bolt.auto-compact=false
Compacting with Channels Tools
​https://github.com/guggero/chantools#compactdb​
Run the following commands in the RaspiBlitz terminal  
See the comments for what each command does.
# install chantools 
# download, inspect and run the install script
wget https://raw.githubusercontent.com/openoms/lightning-node-management/master/lnd.updates/bonus.chantools.sh
cat bonus.chantools.sh
bash bonus.chantools.sh on
​
# stop lnd
sudo systemctl stop lnd
​
# change to the home directory of the bitcoin user
sudo su - bitcoin
​
# run the compacting
chantools compactdb --sourcedb /mnt/hdd/lnd/data/graph/mainnet/channel.db \
                --destdb /mnt/hdd/lnd/data/graph/mainnet/compacted.db
​
# check the size of the compacted.db 
# (the first compacting will have the biggest effect)
du -h /mnt/hdd/lnd/data/graph/mainnet/compacted.db
# example output:
# 730M /mnt/hdd/lnd/data/graph/mainnet/compacted.db
​
# make sure lnd is not runnning (needs sudo)
exit
sudo systemctl stop lnd
sudo su - bitcoin
​
# backup the original database
mv /mnt/hdd/lnd/data/graph/mainnet/channel.db \
   /mnt/hdd/lnd/data/graph/mainnet/uncompacted.db   
​
# move the compacted database in place of the old
mv /mnt/hdd/lnd/data/graph/mainnet/compacted.db \
   /mnt/hdd/lnd/data/graph/mainnet/channel.db  
​
# exit the bitcoin user to admin
exit
​
# start lnd
sudo systemctl start lnd
​
# unlock the wallet
lncli unlock
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