Configure iSCSI. target - centos 7

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.server.world   +----------+----------+   www.server.world   |
|                      |                     |                      |
+----------------------+                     +----------------------+

[1]	Install admin tools first.

[root@dlp ~]# yum -y install targetcli

[2]	Configure iSCSI Target. For example, create an disk-image under the /iscsi_disks directory and set it as a SCSI device.

# create the directory [root@dlp ~]# mkdir /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 /iscsi_disks/disk01.img with 20G /backstores/fileio> create disk01 /iscsi_disks/disk01.img 20G Created fileio disk01 with size 21474836480 /backstores/fileio> cd /iscsi # create a target /iscsi> create iqn.2014-07.world.server:storage.target00 Created target iqn.2014-07.world.server:storage.target00. Created TPG 1. /iscsi> cd iqn.2014-07.world.server:storage.target00/tpg1/portals # set IP address of the target /iscsi/iqn.20.../tpg1/portals> create 10.0.0.30 Using default IP port 3260 Created network portal 10.0.0.30:3260. /iscsi/iqn.20.../tpg1/portals> cd ../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.server:www.server.world Created Node ACL for iqn.2014-07.world.server:www.server.world Created mapped LUN 0. /iscsi/iqn.20...t00/tpg1/acls> cd iqn.2014-07.world.server:www.server.world # set UserID for authentication /iscsi/iqn.20....server.world> set auth userid=username Parameter userid is now 'username'. /iscsi/iqn.20....server.world> set auth password=password Parameter password is now 'password'. /iscsi/iqn.20....server.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 ~]# netstat -lnp | grep 3260 tcp 0 0 10.0.0.30:3260 0.0.0.0:* LISTEN -