CentOS 7
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Configure iSCSI Target(tgt)
2015/12/15
 
Configure Storage Server with iSCSI.
This is the example of configuring iSCSI Target with scsi-target-utils.
[1] Install scsi-target-utils.
# install from EPEL

[root@dlp ~]#
yum --enablerepo=epel -y install scsi-target-utils
[2] Configure iSCSI Target.
For example, create a disk image under the [/iscsi_disks] directory and set it as a shared disk.
# create a disk image

[root@dlp ~]#
mkdir /iscsi_disks

[root@dlp ~]#
dd if=/dev/zero of=/iscsi_disks/disk01.img count=0 bs=1 seek=10G
[root@dlp ~]#
vi /etc/tgt/targets.conf
# add follows to the end

# if you set some devices, add <target>-</target> and set the same way with follows

# naming rule : [ iqn.yaer-month.domain:any name ]

<target iqn.2015-12.world.srv:target00>
   
# provided devicce as a iSCSI target

    backing-store /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>
[3] If SELinux is enabled, change SELinux Context.
[root@dlp ~]#
chcon -R -t tgtd_var_lib_t /iscsi_disks

[root@dlp ~]#
semanage fcontext -a -t tgtd_var_lib_t /iscsi_disks

[4] If Firewalld is running, allow iSCSI Target service.
[root@dlp ~]#
firewall-cmd --add-service=iscsi-target --permanent

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

success
[5] Start tgtd and verify status.
[root@dlp ~]#
systemctl start tgtd

[root@dlp ~]#
systemctl enable tgtd

# show status

[root@dlp ~]#
tgtadm --mode target --op show

Target 1: iqn.2015-12.world.srv:target00
    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: /iscsi_disks/disk01.img
            Backing store flags:
    Account information:
        username
    ACL information:
        10.0.0.31
 
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