electrumx/samples/systemd/electrumx.conf

#suggested /etc/electrumx.conf for systemd

#
#REQUIRED
#

    DB_DIRECTORY =
    USERNAME = electrumx
    ELECTRUMX = /usr/local/bin/electrumx_server.py

    #Bitcoin Node RPC Credentials
    DAEMON_URL = http://username:password@hostname:port/
        #port is optional, defaults to COIN RPC default

#
#REQUIRED FOR PUBLIC VISIBILITY
#

    #HOST = 0.0.0.0
        #listen on interface, (0.0.0.0 is any)
    #TCP_PORT = 50001
    #SSL_PORT = 50002
        #Requires
        #SSL_CERTFILE = /path/to/server.crt
        #SSL_KEYFILE = /path/to/server.key

#
#OPTIONAL VISIBILITY
#

    #BANNER_FILE = /path/to/banner
    #DONATION_ADDRESS =
    #IRC = yes
    #IRC_NICK =
    #REPORT_HOST = $HOST
    #REPORT_TCP_PORT =  #defaults to TCP_PORT
    #REPORT_SSL_PORT =  #defaults to SSL_PORT
    #RPC_PORT = 8000


#
#MISC
#
    #COIN = Bitcoin  # lib/coins.py
    #NETWORK = mainnet  # lib/coins.py
    #DB_ENGINE = leveldb
        #leveldb, rocksdb, lmdb (You'll need to install appropriate python packages)

    #REORG_LIMIT = 200
        #maximum number of blocks to be able to handle in a chain
        #reorganisation.  ElectrumX retains some fairly compact
        #undo information for this many blocks in levelDB.

    #ANON_LOGS =
         #Set to anything non-empty to remove IP addresses from logs.


#These following environment variables are to help limit server
#resource consumption and to prevent simple DoS.  Address subscriptions
#in ElectrumX are very cheap - they consume about 100 bytes of memory
#each and are processed efficiently.  I feel the defaults are low and
#encourage you to raise them.

    #MAX_SUBS = 250000
        #Maximum number of address subscriptions across all sessions
    #MAX_SESSION_SUBS = 50000
        #Maximum number of address subscriptions permitted to a single session.


#If synchronizing from the Genesis block your performance might change
#by tweaking the following cache variables.  Cache size is only checked
#roughly every minute, so the caches can grow beyond the specified
#size.  Also the Python process is often quite a bit fatter than the
#combined cache size, because of Python overhead and also because
#leveldb consumes a lot of memory during UTXO flushing.  So I recommend
#you set the sum of these to nothing over half your available physical
#RAM:

    #HIST_MB = 300
        #amount of history cache, in MB, to retain before flushing to
        #disk.  Default is 300; probably no benefit being much larger
        #as history is append-only and not searched.

    #UTXO_MB = 1000
       #amount of UTXO and history cache, in MB, to retain before
       #flushing to disk.  Default is 1000.  This may be too large
       #for small boxes or too small for machines with lots of RAM.
       #Larger caches generally perform better as there is
       #significant searching of the UTXO cache during indexing.
       #However, I don't see much benefit in my tests pushing this
       #too high, and in fact performance begins to fall.  My
       #machine has 24GB RAM; the slow down is probably because of
       #leveldb caching and Python GC effects.  However this may be
       #very dependent on hardware and you may have different
       #results.