MySQL Cluster setup, receiving error "Specify node id" I am attempting to set up a MySQL Cluster.
I have the following setup:

One management node
Two data nodes
One SQL node

Below is the config.ini file:
[ndbd default]
# Options affecting ndbd processes on all data nodes:
NoOfReplicas=1     # Number of replicas

DataMemory=256M    # How much memory to allocate for data storage

IndexMemory=128M   # How much memory to allocate for index storage


#Directory for Data Node
DataDir=/var/lib/mysql-cluster

[ndb_mgmd]

# Management process options:
HostName=x.x.x.21

datadir=/var/lib/mysql-cluster

# Storage Nodes
[NDBD]

HostName=x.x.x.188
DataDir= /var/lib/mysql-cluster

[NDBD]

HostName=x.x.x.189
DataDir= /var/lib/mysql-cluster

# Setup node IDs for MySQL API-servers (clients of the cluster)
[mysqld]
# SQL node options:
hostname=x.x.x.22

Below is my.cnf file
[mysqld]

ndbcluster # run NDB storage engine

ndb-connectstring=X.X.X.21 # location of management server

[mysql_cluster]

ndb-connectstring=X.X.X.21 # location of management server

But when I start command ndb_mgmd -f /etc/config.ini --initial
I am getting the following error:

MySQL Cluster Management Server mysql-5.6.28 ndb-7.4.10
2018-05-09 14:29:08 [MgmtSrvr] ERROR    -- Could not determine which nodeid to use for this node. Specify it with --ndb-nodeid= on command line

Can anyone please help?
(Disclaimer: I'm no expert on NDB Cluster)

A few options to try:

Have you tried ndb_mgmd with the --no-nodeid-checks option?

Description on the ndb_mgmd documentation page

As the error message suggests, maybe try ndb_mgmd with the --ndb-nodeid= option? I'm guessing any small number might be valid. (Note: guessing!)

Description on the Common NDB Options documentation page