RHEL7 이상 버전에서의 iSCSI Target 구성

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

# enter the admin console
[root@dlp ~]# targetcli
targetcli shell version 2.1.53
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.2022-01.world.srv:dlp.target01 
Created target iqn.2022-01.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.2022-01.world.srv:dlp.target01/tpg1 

# enable authentication
/iscsi/iqn.20...target01/tpg1> set attribute authentication=1 
Parameter authentication is now '1'.
/iscsi/iqn.20...target01/tpg1> cd 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.2022-01.world.srv:node01.initiator01 
Created Node ACL for iqn.2022-01.world.srv:node01.initiator01
Created mapped LUN 0.
/iscsi/iqn.20...t01/tpg1/acls> cd iqn.2022-01.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

테스트환경
* HOST OS : CentOS Linux release 7
* GUEST OS : CentOS Linux release 7

targetcli 는 트리 기반의 파일 시스템과 유사한 방식으로 탐색한다
targetcli 는 커널의 대상 서스 시스템을 구성하고 저장하기 위한 쉘 스크립트 이다

Step1. Install and run targetcli

이 문서에서는 공유 디스크로 생성한 LVM 볼륨 구성은 작성하지 않았습니다
현재 등록되어 있는 디스크 정보들을 확인한다

[root@server1 ~]# fdisk -l | grep Disk
Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
Disk /dev/sdb: 53.7 GB, 53687091200 bytes, 104857600 sectors // ISCSI 구성을 위해 신규 추가된 디스크
Disk /dev/mapper/centos-swap: 2164 MB, 2164260864 bytes, 4227072 sectors
Disk /dev/mapper/centos-root: 29.5 GB, 29519511552 bytes, 57655296 sectors

[root@server1 ~]# vgs
  VG             #PV #LV #SN Attr   VSize    VFree
  VG_iscsi_Disk1   1   1   0 wz--n- 1020.00m    0 
  VG_iscsi_Disk2   1   1   0 wz--n-   10.00g    0 
  centos           1   2   0 wz--n-   29.51g    0 
  
[root@server1 ~]# lvs
  LV             VG             Attr       LSize    Pool Origin Data%  Move Log Cpy%Sync Convert
  lv_iscsi_Disk1 VG_iscsi_Disk1 -wi-a----- 1020.00m                                             
  lv_iscsi_Disk2 VG_iscsi_Disk2 -wi-a-----   10.00g                                             
  root           centos         -wi-ao----   27.49g                                             
  swap           centos         -wi-ao----    2.02g

targetcli 설치 및 확인 :

# yum install targetcli

# targetcli --version
/usr/bin/targetcli version 2.1.fb37

* target service 구동 :

# systemctl start target

targetcli 명령어로 쉘 스크립트 실행

[root@server1 ~]# targetcli 
targetcli shell version 2.1.fb37
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/> ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: 0]
  | o- fileio ................................................................................................. [Storage Objects: 0]
  | o- pscsi .................................................................................................. [Storage Objects: 0]
  | o- ramdisk ................................................................................................ [Storage Objects: 0]
  o- iscsi ............................................................................................................ [Targets: 0]
  o- loopback ......................................................................................................... [Targets: 0]
/>

backstores 구성

# Discover targets at a given IP address:
iscsiadm --mode discoverydb --type sendtargets --portal 192.168.1.10 --discover

#Login, must use a node record id found by the discovery:
iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260 --login

#Logout:
iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260 --logout

#List node records:
iscsiadm --mode node

#Display all data for a given node record:
iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 192.168.1.1:3260

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