CentOS 7.x iSCSI target server setup

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To setup iSCSI target server on CentOS 7 use:

1. Install required packages:

   yum -y install targetcli python-configshell python-rtslib python-six python-dbus

   One can consider doing 'yum -y update' of whole system as targetcli has many hidden dependencies

2. Clear configuration using 'targetcli clearconfig confirm=true '
3. Run 'targetcli' and configure it using:

   #Create file to be used as iscsi backstore
   cd /backstores
   fileio/ create test /opt/test.iscsi 100m
   ls
   #Note that we can also use block devices using /backstores/block
   #/opt/test.iscsi can also be created using
   #cd /opt
   #qemu-img create -f raw test.iscsi 100M
   
   cd /iscsi
   #This will create IQN number automatically
   #Ideally we should create different iqn numbers for every backstore
   #So that there is flexibility on client side.  We can run
   #create multiple times to create different iqn numbers.
   create
   cd iqn.<press-tab-to-autocomplete>
   
   
   #Create lun
   cd tpg1/luns
   create /backstores/fileio/test
   
   #Allow client IQN numbers without authentication
   cd ../acls
   create <client1-iscsi-initiator-name>
   create <client2-iscsi-initiator-name>
   
   #Save and exit
   cd /
   saveconfig
   exit

   Client initiator name is located in file '/etc/iscsi/initiatorname.iscsi'. Take only value after 'InitiatorName=' starting with 'iqn.'

4. Configure service to start on system boot and also start it for current run:

   systemctl enable target
   systemctl start target

5. Disable firewall or given exception for port 3260

   systemctl disable firewalld
   systemctl stop firewalld

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