if [ ! -s "$PGDATA/PG_VERSION" ]; then

    # Prepare REPLICA
    if [ -n "$PG_SLOT" ] && [ -n "$PG_MASTER_HOST" ]; then

  # Configure connecton for pg_basebackup and psql create replication slot
  echo "$PG_MASTER_HOST:5432:*:$POSTGRES_USER:$POSTGRES_PASSWORD" > ~/.pgpass
  chmod 0600 ~/.pgpass

  NUM_ATTEMPTS=20
  n=0
  until [ $n -ge $NUM_ATTEMPTS ]
  do
      pg_basebackup -D $PGDATA -Fp -U $POSTGRES_USER -w -R -Xs -c fast -l 'clone'  -P -v -h $PG_MASTER_HOST -U $POSTGRES_USER  && export RESTORED=1 && break
      n=$[$n+1]
      echo "Not ready; Sleep $n"
      sleep $n
  done

  # Create replication slot
  psql -h $PG_MASTER_HOST -U $POSTGRES_USER -w -c "SELECT pg_create_physical_replication_slot('$PG_SLOT');" || echo "may be exists"

  # Prepare recovery.conf
  echo "primary_slot_name = '$PG_SLOT'"   >> "$PGDATA/standby.signal"
  echo "primary_conninfo = 'host=$PG_MASTER_HOST port=5432 user=$POSTGRES_USER password=$POSTGRES_PASSWORD'" >> "$PGDATA/standby.signal"
  #echo "restore_command = '/opt/pgpro/std-12/bin/wal-g wal-fetch %f %p'" >> "$PGDATA/standby.signal"
  echo
  echo 'PostgreSQL clone process complete; ready for start up.'
  echo

"host replication $POSTGRES_USER 0.0.0.0/0 md5"