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Configure iSCSI Target (tgt)
2019/01/17
 
Configure Storage Server with iSCSI.
This is the case you use "tgt" for iSCSI Target.
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.
dlp:~ #
zypper -n install tgt
[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 disk-image

dlp:~ #
mkdir /var/lib/iscsi_disks

dlp:~ #
dd if=/dev/zero of=/var/lib/iscsi_disks/disk01.img count=0 bs=1 seek=10G
[root@dlp ~]#
vi /etc/tgt/conf.d/target01.conf
# create new

# naming rule : [ iqn.(year)-(month).(reverse of domain name):(any name you like) ]

<target iqn.2019-01.world.srv:dlp.target01>
    # provided devicce as a iSCSI target
    backing-store /var/lib/iscsi_disks/disk01.img
    # iSCSI Initiator's IQN you allow to connect to this Target
    initiator-name iqn.2019-01.world.srv:www.initiator01
    # authentication info ( set any name you like for "username", "password" )
    incominguser username password
</target> 

dlp:~ #
systemctl start tgtd

dlp:~ #
systemctl enable tgtd
# show status

dlp:~ #
tgtadm --mode target --op show

Target 1: iqn.2019-01.world.srv:dlp.target01
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            SWP: No
            Thin-provisioning: No
            Backing store type: null
            Backing store path: None
            Backing store flags:
        LUN: 1
            Type: disk
            SCSI ID: IET     00010001
            SCSI SN: beaf11
            Size: 10737 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            SWP: No
            Thin-provisioning: No
            Backing store type: rdwr
            Backing store path: /var/lib/iscsi_disks/disk01.img
            Backing store flags:
    Account information:
        username
    ACL information:
        ALL
        iqn.2019-01.world.srv:www.initiator01
[3] If Firewalld is running, allow iSCSI Target service.
dlp:~ #
firewall-cmd --add-service=iscsi-target --permanent

success
dlp:~ #
firewall-cmd --reload

success
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