Now that it is installed you will have to enable the service for it. Don't yet start it.
sudo systemctl enable iscsid
Time to configure iSCSI, first open the file "/etc/iscsi/initiatorname.iscsi". And set the Initiator Target to the correct value.
/etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2005-10.be.iswleuven.nas1
Time to open the iSCSI configuration file. Comment the manual version and uncomment the automatic line.
/etc/iscsi/initiatorname.iscsi
# To request that the iscsi initd scripts startup a session set to "automatic".
node.startup = automatic
#
# To manually startup the session set to "manual". The default is manual.
#node.startup = manual