Fedora 27
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Configure iSCSI Target (tgt)
2017/12/18
 
Configure Storage Server with iSCSI.
This is the example of configuring iSCSI Target with scsi-target-utils.
[1] Install scsi-target-utils.
[root@dlp ~]#
dnf -y install scsi-target-utils
[2] Configure iSCSI Target.
For example, create a disk image under the [/var/lib/iscsi_disks] directory and set it as a shared disk.
# 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
# create new

# if you set some devices, add - and set the same way with follows

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

<target iqn.2017-12.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>
[3] If SELinux is enabled, change SELinux Context.
[root@dlp ~]#
dnf -y install policycoreutils-python-utils
[root@dlp ~]#
chcon -R -t tgtd_var_lib_t /var/lib/iscsi_disks

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

[root@dlp ~]#
vi tgtd.te
# create new

module tgtd 1.0;

require {
        type tgtd_t;
        type var_run_t;
        class dir create;
}

#============= tgtd_t ==============
allow tgtd_t var_run_t:dir create;
[root@dlp ~]#
checkmodule -m -M -o tgtd.mod tgtd.te

[root@dlp ~]#
semodule_package --outfile tgtd.pp --module tgtd.mod

[root@dlp ~]#
semodule -i tgtd.pp

[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 ~]#
chmod 644 /usr/lib/systemd/system/tgtd.service

[root@dlp ~]#
systemctl start tgtd

[root@dlp ~]#
systemctl enable tgtd

# show status

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

Target 1: iqn.2017-12.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
 
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