Multiple MGM nodeid problem

[mosi moj]

Hi,
i want to have 2 MGM nodes. here is may config.ini

[NDBD DEFAULT]
NoOfReplicas=3
DataMemory=80M
IndexMemory=50M

[TCP DEFAULT]
portnumber=80

[NDB_MGMD]
id=1
hostname=192.168.50.51
PortNumber=5050
datadir=/var/lib/mysql-cluster/logs
ArbitrationRank=1

[NDB_MGMD]
id=2
hostname=192.168.50.52
datadir=/var/lib/mysql-cluster/logs
ArbitrationRank=2


[NDBD]
id=5
hostname=192.168.50.50
datadir=/var/lib/mysql-cluster/logs

[NDBD]
id=6
hostname=192.168.50.51
datadir=/var/lib/mysql-cluster/logs

[NDBD]
id=7
hostname=192.168.50.52
datadir=/var/lib/mysql-cluster/logs

#[NDBD]
#id=
#hostname=192.168.50.53
#datadir=/var/lib/mysql-cluster/logs

[MYSQLD]
id=20
hostname=192.168.50.50

[MYSQLD]
id=21
hostname=192.168.50.51

[MYSQLD]
id=22
hostname=192.168.50.52

But i don't know, how can i write "my.cnf". there are differently options ([mysqld],[ndbd],[mysql_cluster],...). Which nodeid must be set? one must indicate in connectstring to nodeid of ndbd or sqld.

thanks