Fedora 31
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iSCSI : Configure Target (Targetcli)
2019/11/15
 
Configure Storage Server with iSCSI.
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 tool.
[root@dlp ~]#
dnf -y install targetcli
[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 directory

[root@dlp ~]#
mkdir /var/lib/iscsi_disks

# enter the admin console

[root@dlp ~]#
targetcli

targetcli shell version 2.1.fb49
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/> cd backstores/fileio 

# create a disk-image with the name [disk01] on [/var/lib/iscsi_disks/disk01.img] with 10G
/backstores/fileio> create disk01 /var/lib/iscsi_disks/disk01.img 10G 
Created fileio disk01 with size 10737418240
/backstores/fileio> cd /iscsi 

# create a target
# naming rule : [ iqn.(year)-(month).(reverse of domain name):(any name you like) ]
/iscsi> create iqn.2019-11.world.srv:dlp.target01 
Created target iqn.2019-11.world.srv:dlp.target01.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.
/iscsi> cd iqn.2019-11.world.srv:dlp.target01/tpg1/luns 

# set LUN
/iscsi/iqn.20...t01/tpg1/luns> create /backstores/fileio/disk01 
Created LUN 0.
/iscsi/iqn.20...t01/tpg1/luns> cd ../acls 

# set ACL (it's the IQN of an initiator you permit to connect)
/iscsi/iqn.20...t01/tpg1/acls> create iqn.2019-11.world.srv:node01.initiator01 
Created Node ACL for iqn.2019-11.world.srv:node01.initiator01
Created mapped LUN 0.
/iscsi/iqn.20...t01/tpg1/acls> cd iqn.2019-11.world.srv:node01.initiator01 

# set UserID and Password for authentication
/iscsi/iqn.20...w.initiator01> set auth userid=username 
Parameter userid is now 'username'.
/iscsi/iqn.20...w.initiator01> set auth password=password 
Parameter password is now 'password'.
/iscsi/iqn.20...w.initiator01> exit 
Global pref auto_save_on_exit=true
Configuration saved to /etc/target/saveconfig.json

# after configuration above, the target enters in listening like follows

[root@dlp ~]#
ss -napt | grep 3260

LISTEN   0         256                 0.0.0.0:3260             0.0.0.0:*

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

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

success
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