docker-bitcoind/bitcoind.run

#!/bin/bash

export HOME="/var/lib/bitcoind"

# gen random pw for rpc server
RANDOMPW=$(tr -dc 'a-f0-9' < /dev/urandom | head -c20)

cat <<EOF > $HOME/bitcoin.conf
rpcuser=${BITCOIND_RPCUSER:-rpcuser}
rpcpassword=${BITCOIND_RPCPASSWORD:-$RANDOMPW}
EOF

# SECURITY this puts the rpc password into the container log
cat $HOME/bitcoin.conf

ARGS=""
ARGS+=" -printtoconsole"
ARGS+=" -disablewallet"
ARGS+=" -datadir=$HOME"
ARGS+=" -conf=$HOME/bitcoin.conf"
ARGS+=" -rpcallowip=::/0"

if [[ ! -d $HOME/blocks ]]; then
    if [[ -e /var/lib/bootstrap.dat ]]; then
        ARGS+=" -loadblock=/var/lib/bootstrap.dat"
    fi
fi

chown -R bitcoind:bitcoind $HOME

exec chpst -ubitcoind \
    bitcoind $ARGS \
        $BITCOIND_EXTRA_OPTS \
        2>&1