tarantoolctl connpool.lua:316: attempt to index field 'configuration' (a nil value) - tarantool

Question

i have error with starting sharding
version of tarantool and os:
main/101/tarantoolctl C> version 1.6.8-654-ge91080f on ubuntu-16.04 LTS
in configuration file
roman#zotac-pc:~$ egrep -v "^[[:space:]]*--|^$" /etc/tarantool/instances.enabled/test.lua
box.cfg {
listen = 3301;
slab_alloc_arena = 0.5;
slab_alloc_minimal = 16;
slab_alloc_maximal = 1048576;
slab_alloc_factor = 1.06;
snapshot_period = 0;
snapshot_count = 6;
panic_on_snap_error = true;
panic_on_wal_error = true;
rows_per_wal = 5000000;
snap_io_rate_limit = nil;
wal_mode = "none";
wal_dir_rescan_delay = 2.0;
io_collect_interval = nil;
readahead = 16320;
log_level = 5;
logger_nonblock = true;
too_long_threshold = 0.5;
}
local function bootstrap()
local space = box.schema.create_space('test')
space:create_index('primary')
box.schema.user.grant('guest', 'read,write,execute', 'universe')
box.schema.user.create('test', { password = 'test' })
box.schema.user.grant('test', 'replication')
box.schema.user.grant('test', 'read,write,execute', 'universe')
end
box.once('test-1.0', bootstrap)
local shard = require('shard')
local shards = {
servers = {
{ uri = [[127.0.0.1:3301]]; zone = [[0]]; };
{ uri = [[127.0.0.1:3302]]; zone = [[1]]; };
};
login = 'test';
password = 'test';
redundancy = 1;
binary = '127.0.0.1:3301';
monitor = false;
}
shard.init(cfg)
roman#zotac-pc:~$
sample error in log file:
main/101/test I> Sharding initialization started...
main/101/test tarantoolctl:422 E> Start failed: /usr/share/tarantool/connpool.lua:316: attempt to index field 'configuration' (a nil value)
main C> entering the event loop

Answer 1

in /etc/tarantool/../example.lua from ubuntu package function shard.init(cfg) need replase shard.init(shards)
below code is working fine:
local shard = require('shard')
local shards = {
servers = {
{ uri = [[127.0.0.1:3301]]; zone = [[0]]; };
{ uri = [[127.0.0.1:3302]]; zone = [[1]]; };
};
login = 'test';
password = 'test';
redundancy = 1;
binary = '127.0.0.1:3301';
monitor = false;
}
shard.init(shards)