$ ./bin/minetestserver --config ~/minetest/minetest.conf --world ~/minetest/world.mt
2017-05-11 18:17:59: WARNING[Main]: Couldn't find a locale directory!
2017-05-11 18:17:59: [Main]: Supplied world.mt file - stripping it off.
2017-05-11 18:17:59: ERROR[Main]: ServerError: Failed to initialize world

$ cat ~/minetest/world.mt
gameid = minimal
backend = sqlite3
creative_mode = true
enable_damage = true
player_backend = sqlite3
server_announce = false

cat ~/minetest/minetest.conf
# This file contains settings of Minetest Game that can be changed in minetest.conf
# By default, all the settings are commented and not functional.
# Uncomment settings by removing the preceding #.

# Whether creative mode (fast digging of all blocks, unlimited resources) should be enabled
creative_mode = true

# The time in seconds after which the bones of a dead player can be looted by everyone
# 0 to disable
#share_bones_time = 1200

# How much earlier the bones of a dead player can be looted by
# everyone if the player dies in a protected area they don't own.
# 0 to disable. By default it is "share_bones_time" divide by four.
#share_bones_time_early = 300

# Whether standard fire should be disabled ('basic flame' nodes will disappear)
# 'permanent flame' nodes will remain with either setting
#disable_fire = false

# Whether the stuff in initial_stuff should be given to new players
#give_initial_stuff = false
#initial_stuff = default:pick_steel,default:axe_steel,default:shovel_steel,default:torch 99,default:cobble 99

# Whether the TNT mod should be enabled
#enable_tnt = <true in singleplayer, false in multiplayer>

# The radius of a TNT explosion
#tnt_radius = 3

# Enable the stairs mod ABM that replaces the old 'upside down'
# stair and slab nodes in old maps with the new param2 versions.
#enable_stairs_replace_abm = false

# Whether you allow respawning in beds
# Default value is true
#enable_bed_respawn = true

# Whether players can skip night by sleeping
# Default value is true
#enable_bed_night_skip = true