CentOS 7
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Configure iSCSI Target
2014/07/14
 
Configure Storage Server with iSCSI.
A storage on a network is called iSCSI Target, a Client which connects to iSCSI Target is called iSCSI Initiator.
This example is based on the environment below. 
+----------------------+          |          +----------------------+
| [   iSCSI Target   ] |10.0.0.30 | 10.0.0.31| [ iSCSI Initiator  ] |
|     dlp.srv.world    +----------+----------+     www.srv.world    |
|                      |                     |                      |
+----------------------+                     +----------------------+
[1] Install administration tools first.
[root@dlp ~]#
yum -y install targetcli
[2] Configure iSCSI Target.
For example, create an disk-image under the /var/lib/iscsi_disks directory and set it as a SCSI device.
# create a directory

[root@dlp ~]#
mkdir /var/lib/iscsi_disks

# enter the admin console

[root@dlp ~]#
targetcli 

targetcli shell version 2.1.fb34
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.
/>
cd backstores/fileio
# create a disk-image with the name "disk01" on /var/lib/iscsi_disks/disk01.img with 10G

/backstores/fileio>
create disk01 /var/lib/iscsi_disks/disk01.img 10G

Created fileio disk01 with size 10737418240
/backstores/fileio>
cd /iscsi
# create a target

/iscsi>
create iqn.2014-07.world.srv:storage.target00

Created target iqn.2014-07.world.srv:storage.target00.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.
/iscsi>
cd iqn.2014-07.world.srv:storage.target00/tpg1/luns
# set LUN

/iscsi/iqn.20...t00/tpg1/luns>
create /backstores/fileio/disk01

Created LUN 0.
/iscsi/iqn.20...t00/tpg1/luns>
cd ../acls
# set ACL (it's the IQN of an initiator you permit to connect)

/iscsi/iqn.20...t00/tpg1/acls>
create iqn.2014-07.world.srv:www.srv.world

Created Node ACL for iqn.2014-07.world.srv:www.srv.world
Created mapped LUN 0.
/iscsi/iqn.20...t00/tpg1/acls>
cd iqn.2014-07.world.srv:www.srv.world
# set UserID for authentication

/iscsi/iqn.20....srv.world>
set auth userid=username

Parameter userid is now 'username'.
/iscsi/iqn.20....srv.world>
set auth password=password

Parameter password is now 'password'.
/iscsi/iqn.20....srv.world>
exit

Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
# after configuration above, the target enters in listening like follows.

[root@dlp ~]#
ss -napt | grep 3260 

LISTEN     0      256          *:3260                     *:*
[root@dlp ~]#
systemctl enable target
[3] If Firewalld is running, allow iSCSI Target service.
[root@dlp ~]#
firewall-cmd --add-service=iscsi-target --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
 
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