iSCSI : Configure iSCSI Target (tgt)

Configure Storage Server with iSCSI. This is the example of configuring iSCSI Target with scsi-target-utils. (tgt) Storage server with iSCSI on network is called iSCSI Target, Client Host that connects to iSCSI Target is called iSCSI Initiator. This example is based on the environment like follows. +----------------------+ | +----------------------+ | [ iSCSI Target ] |10.0.0.30 | 10.0.0.51| [ iSCSI Initiator ] | | dlp.srv.world +----------+----------+ node01.srv.world | | | | | +----------------------+ +----------------------+

[1]	Install administration tools.

root@dlp:~#  apt -y 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 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 <target>-</target> and set the same way with follows # naming rule : [ iqn.(year)-(month).(reverse of domain name):(any name you like) ] <target iqn.2025-08.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 initiator-name iqn.2025-08.world.srv:node01.initiator # 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.2025-08.world.srv:dlp.target01 System information: Driver: iscsi State: ready I_T nexus information: I_T nexus: 1 Initiator: iqn.2025-08.world.srv:node01.initiator alias: node01.srv.world Connection: 0 IP Address: 10.0.0.51 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.2025-08.world.srv:node01.initiator