In below example I have done it using "tgtd" on the Server and "open-iscsi" on the clients side.
I have used Centos7 as the "Target" and in the Centos7 I have used KVM and created a "Kali Linux" as a VM. So kali linux VM I have used as iScsi Initiator.
Centos7 Server side output:
167 yum install scsi-target-utils
168 systemctl tgtd start
169 systemctl start tgtd
170 systemctl status tgtd
171 systemctl enable tgtd
172 df -h
173 fdisk
174 fdisk -l
175 vgs
502 yum provides gnome-disk-utility
503 yum install gnome-disk-utility-3.14.0-2.el7.x86_64
504 gnome-disks
505 cat /etc/tgt/targets.conf
506 vi /etc/tgt/targets.conf
507 cat /etc/tgt/targets.conf
508 systemctl restart tgtd
509 journalctl -xe
510 hostname
511 cd /var/log/
512 ls
513 more secure
514
515 date
516 ps -ef |grep 16522
517 systemctl restart tgtd
518 systemctl status tgtd.service
519 cat /etc/tgt/targets.conf
520 vi /etc/tgt/tgtd.conf
521 vi /etc/tgt/tgtd.conf
522 cat /etc/tgt/targets.conf
523 vi /etc/tgt/tgtd.conf
524 systemctl restart tgtd
525 systemctl status tgtd
526 df -k
527 tgt-admin --show
528 lvdisplay
529 tgt-admin --show
530 tgtadm --lld isci --op bind --mode target --tid 1 -I ALL
531 history
[root@myPC log]# ps -ef |grep 16522
root 16834 13494 0 22:15 pts/1 00:00:00 grep --color=auto 16522
[root@myPC log]# systemctl restart tgtd
Job for tgtd.service failed because the control process exited with error code. See "systemctl statu
s tgtd.service" and "journalctl -xe" for details.
[root@myPC log]# systemctl status tgtd.service
● tgtd.service - tgtd iSCSI target daemon
Loaded: loaded (/usr/lib/systemd/system/tgtd.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2017-01-11 22:17:50 EST; 40s ago
Process: 16944 ExecStop=/usr/sbin/tgtadm --op delete --mode system (code=exited, status=0/SUCCESS)
Process: 16940 ExecStop=/usr/sbin/tgt-admin --update ALL -c /dev/null (code=exited, status=0/SUCCE
SS)
Process: 16938 ExecStop=/usr/sbin/tgtadm --op update --mode sys --name State -v offline (code=exit
ed, status=0/SUCCESS)
Process: 3189 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v ready (code=ex
ited, status=0/SUCCESS)
Process: 16934 ExecStartPost=/usr/sbin/tgt-admin -e -c $TGTD_CONFIG (code=exited, status=1/FAILURE
)
Process: 16932 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v offline (code
=exited, status=0/SUCCESS)
Process: 16928 ExecStartPost=/bin/sleep 5 (code=exited, status=0/SUCCESS)
Process: 16926 ExecStart=/usr/sbin/tgtd -f $TGTD_OPTS (code=exited, status=0/SUCCESS)
Main PID: 16926 (code=exited, status=0/SUCCESS)
Jan 11 22:17:45 myPC tgtd[16926]: tgtd: iser_ib_init(3436) Failed to initialize RDMA; load kernel mo
dules?
Jan 11 22:17:45 myPC tgtd[16926]: tgtd: work_timer_start(146) use timer_fd based scheduler
Jan 11 22:17:45 myPC tgtd[16926]: tgtd: bs_init_signalfd(267) could not open backing-store module di
rectory /usr/l...-store
Jan 11 22:17:45 myPC tgtd[16926]: tgtd: bs_init(386) use signalfd notification
Jan 11 22:17:50 myPC tgt-admin[16934]: Multiple default-driver definitions are not allowed!
Jan 11 22:17:50 myPC tgt-admin[16934]: Check your config file for errors.
Jan 11 22:17:50 myPC systemd[1]: tgtd.service: control process exited, code=exited status=1
Jan 11 22:17:50 myPC systemd[1]: Failed to start tgtd iSCSI target daemon.
Jan 11 22:17:50 myPC systemd[1]: Unit tgtd.service entered failed state.
Jan 11 22:17:50 myPC systemd[1]: tgtd.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
[root@myPC log]# cat /etc/tgt/targets.conf
# This is a sample config file for tgt-admin.
#
# The "#" symbol disables the processing of a line.
# Set the driver. If not specified, defaults to "iscsi".
default-driver iscsi
# Set iSNS parameters, if needed
#iSNSServerIP 192.168.111.222
#iSNSServerPort 3205
#iSNSAccessControl On
#iSNS On
# Continue if tgtadm exits with non-zero code (equivalent of
# --ignore-errors command line option)
#ignore-errors yes
default-driver iscsi
backing-store /dev/sda3
initiator-address 192.168.122.1
[root@myPC log]# vi /etc/tgt/tgtd.conf
[root@myPC log]# vi /etc/tgt/tgtd.conf
[root@myPC log]# cat /etc/tgt/targets.conf
# This is a sample config file for tgt-admin.
#
# The "#" symbol disables the processing of a line.
# Set the driver. If not specified, defaults to "iscsi".
default-driver iscsi
# Set iSNS parameters, if needed
#iSNSServerIP 192.168.111.222
Jan 11 22:17:50 myPC systemd[1]: Unit tgtd.service entered failed state.
Jan 11 22:17:50 myPC systemd[1]: tgtd.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
[root@myPC log]# cat /etc/tgt/targets.conf
# This is a sample config file for tgt-admin.
#
# The "#" symbol disables the processing of a line.
# Set the driver. If not specified, defaults to "iscsi".
default-driver iscsi
# Set iSNS parameters, if needed
#iSNSServerIP 192.168.111.222
#iSNSServerPort 3205
#iSNSAccessControl On
#iSNS On
# Continue if tgtadm exits with non-zero code (equivalent of
# --ignore-errors command line option)
#ignore-errors yes
default-driver iscsi
backing-store /dev/sda3
initiator-address 192.168.122.1
[root@myPC log]# vi /etc/tgt/tgtd.conf
[root@myPC log]# vi /etc/tgt/tgtd.conf
[root@myPC log]# cat /etc/tgt/targets.conf
# This is a sample config file for tgt-admin.
#
# The "#" symbol disables the processing of a line.
# Set the driver. If not specified, defaults to "iscsi".
default-driver iscsi
# Set iSNS parameters, if needed
#iSNSServerIP 192.168.111.222
Set iSNS parameters, if needed
#iSNSServerIP 192.168.111.222
#iSNSServerPort 3205
#iSNSAccessControl On
#iSNS On
# Continue if tgtadm exits with non-zero code (equivalent of
# --ignore-errors command line option)
#ignore-errors yes
default-driver iscsi
backing-store /dev/sda3
initiator-address 192.168.122.1
[root@myPC log]# vi /etc/tgt/tgtd.conf
[root@myPC log]#
[root@myPC log]#
[root@myPC log]# systemctl restart tgtd
[root@myPC log]# systemctl status tgtd
● tgtd.service - tgtd iSCSI target daemon
Loaded: loaded (/usr/lib/systemd/system/tgtd.service; enabled; vendor preset: disabled)
Active: active (running) since Wed 2017-01-11 22:31:39 EST; 14s ago
Process: 16944 ExecStop=/usr/sbin/tgtadm --op delete --mode system (code=exited, status=0/SUCCESS)
Process: 16940 ExecStop=/usr/sbin/tgt-admin --update ALL -c /dev/null (code=exited, status=0/SUCCE
SS)
Process: 16938 ExecStop=/usr/sbin/tgtadm --op update --mode sys --name State -v offline (code=exit
ed, status=0/SUCCESS)
Process: 17769 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v ready (code=e
xited, status=0/SUCCESS)
Process: 17741 ExecStartPost=/usr/sbin/tgt-admin -e -c $TGTD_CONFIG (code=exited, status=0/SUCCESS
)
Process: 17739 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v offline (code
=exited, status=0/SUCCESS)
Process: 17737 ExecStartPost=/bin/sleep 5 (code=exited, status=0/SUCCESS)
Main PID: 17735 (tgtd)
CGroup: /system.slice/tgtd.service
└─17735 /usr/sbin/tgtd -f
Process: 17737 ExecStartPost=/bin/sleep 5 (code=exited, status=0/SUCCESS)
Main PID: 17735 (tgtd)
CGroup: /system.slice/tgtd.service
└─17735 /usr/sbin/tgtd -f
Jan 11 22:31:34 myPC tgtd[17735]: librdmacm: Warning: couldn't read ABI version.
Jan 11 22:31:34 myPC tgtd[17735]: librdmacm: Warning: assuming: 4
Jan 11 22:31:34 myPC tgtd[17735]: librdmacm: Fatal: unable to get RDMA device list
Jan 11 22:31:34 myPC tgtd[17735]: tgtd: iser_ib_init(3436) Failed to initialize RDMA; load kernel mo
dules?
Jan 11 22:31:34 myPC tgtd[17735]: tgtd: work_timer_start(146) use timer_fd based scheduler
Jan 11 22:31:34 myPC tgtd[17735]: tgtd: bs_init_signalfd(267) could not open backing-store module di
rectory /usr/l...-store
Jan 11 22:31:34 myPC tgtd[17735]: tgtd: bs_init(386) use signalfd notification
Jan 11 22:31:39 myPC tgtd[17735]: tgtd: device_mgmt(246) sz:15 params:path=/dev/sda3
Jan 11 22:31:39 myPC tgtd[17735]: tgtd: bs_thread_open(408) 16
Jan 11 22:31:39 myPC systemd[1]: Started tgtd iSCSI target daemon.
Hint: Some lines were ellipsized, use -l to show in full.
[root@myPC log]#
[root@myPC log]#
[root@myPC log]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/centos-root 52403200 32285408 20117792 62% /
devtmpfs 1869656 0 1869656 0% /dev
tmpfs 1879784 624300 1255484 34% /dev/shm
tmpfs 1879784 9256 1870528 1% /run
tmpfs 1879784 0 1879784 0% /sys/fs/cgroup
/dev/mapper/centos-home 61410000 26627544 34782456 44% /home
/dev/sda1 508588 127596 380992 26% /boot
tmpfs 375960 0 375960 0% /run/user/1001
tmpfs 375960 16 375944 1% /run/user/1000
[root@myPC log]# tgt-admin --show
Target 1: iqn.2017-01.home.myiPC:target1
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: 0 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: /dev/sda3
Backing store flags:
Account information:
ACL information:
192.168.122.1
[root@myPC log]#
vi /etc/tgt/targets.conf
default-driver iscsi
backing-store /dev/sda3
initiator-address 192.168.122.166
Note:
The initiator address in the file above needs to be the "Client's" IP address not the iscsi target IP..
The firewall to be enabled for port 3260.
Command - # firewall-cmd --add port=3260/tcp
