This article will describe installing tgt which provides iSCSI target.
Table of Contents
1 Install tgt
Install tgt package.
$ sudo apt install -y tgt
2 Create iSCSI target
This article uses a file as logical unit. You can use block device as logical unit.
$ sudo mkdir /var/lib/iscsi $ sudo dd if=/dev/zero of=/var/lib/iscsi/disk bs=1M count=1K
Create iSCSI target (tid 1).
$ sudo tgtadm --lld iscsi --op new --mode target --tid 1 \
-T iqn.2018-11.com.hiroom2:disk
Add logical Unit (lun 1) to iSCSI target (Target ID 1).
$ sudo tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 \
-b /var/lib/iscsi/disk
Publish iSCSI target (tid 1) to all IP address. You can specify 192.168.11.1 and 192.168.11.0/24 in addition to ALL.
$ sudo tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
Save configuration for iSCSI target. If you do not save configuration, configuration will be removed after restarting tgtd.
$ sudo tgtadm --dump | sudo tee /etc/tgt/conf.d/disk.conf
3 Connect to iSCSI target with open-iscsi which is iSCSI initiator
iSCSI initiator runs on server which is installed iSCSI target.
The partition is the following before connecting to iSCSI target.
$ cat /proc/partitions major minor #blocks name 254 0 10485760 vda 254 1 248832 vda1 254 2 1 vda2 254 5 10233856 vda5 11 0 1048575 sr0 253 0 9183232 dm-0 253 1 1048576 dm-1
Install open-iscsi package.
$ sudo apt install -y open-iscsi
Get iSCSI target list.
$ sudo iscsiadm -m discovery -t st -p localhost [::1]:3260,1 iqn.2018-11.com.hiroom2:disk
Connect to iSCSI target.
$ sudo iscsiadm -m node \
--targetname iqn.2018-11.com.hiroom2:disk -p localhost -l
Logging in to [iface: default, target:
iqn.2018-11.com.hiroom2:disk, portal: ::1,3260] (multiple)
Login to [iface: default, target:
iqn.2018-11.com.hiroom2:disk, portal: ::1,3260]
successful.
The partition is the following after connecting to iSCSI target. The partition sda is appended.
$ cat /proc/partitions major minor #blocks name 254 0 10485760 vda 254 1 248832 vda1 254 2 1 vda2 254 5 10233856 vda5 11 0 1048575 sr0 253 0 9183232 dm-0 253 1 1048576 dm-1 8 0 1048576 sda