iscsi target

# create a disk-image
root@dlp:~# mkdir /var/lib/iscsi_disks 
root@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
# add to the end
# naming rule : [ iqn.yaer-month.domain:any name ]
<target iqn.2017-04.world.srv:target01>
    # provided devicce as a iSCSI target
    backing-store /var/lib/iscsi_disks/disk01.img
    # iSCSI Initiator's IP address you allow to connect
    initiator-address 10.0.0.31
    # authentication info ( set anyone you like for "username", "password" )
    incominguser username password
</target>

root@dlp:~# systemctl restart tgt
# show status
root@dlp:~# tgtadm --mode target --op show 
Target 1: iqn.2017-04.world.srv: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:
        10.0.0.31