Ubuntu 20.04
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iSCSI : Configure iSCSI Initiator
2020/05/04
 
Configure 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] Configure iSCSI Initiator to connect to iSCSI Target.
root@node01:~#
apt -y install open-iscsi
root@node01:~#
vi /etc/iscsi/initiatorname.iscsi
# change to the same IQN you set on the iSCSI target server

InitiatorName=
iqn.2020-05.world.srv:node01.initiator01
root@node01:~#
vi /etc/iscsi/iscsid.conf
# line 57: uncomment

node.session.auth.authmethod = CHAP
# line 61,62: uncomment and specify the username and password you set on the iSCSI target server

node.session.auth.username =
username

node.session.auth.password =
password
root@node01:~#
systemctl restart iscsid open-iscsi
# discover target

root@node01:~#
iscsiadm -m discovery -t sendtargets -p 10.0.0.30

10.0.0.30:3260,1 iqn.2020-05.world.srv:dlp.target01
# confirm status after discovery

root@node01:~#
iscsiadm -m node -o show

# BEGIN RECORD 2.0-874
node.name = iqn.2020-05.world.srv:dlp.target01
node.tpgt = 1
node.startup = manual
node.leading_login = No
.....
.....
node.conn[0].iscsi.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD

# login to the target

root@node01:~#
iscsiadm -m node --login

Logging in to [iface: default, target: iqn.2020-05.world.srv:dlp.target01, portal: 10.0.0.30,3260] (multiple)
Login to [iface: default, target: iqn.2020-05.world.srv:dlp.target01, portal: 10.0.0.30,3260] successful.

# confirm the established session

root@node01:~#
iscsiadm -m session -o show

tcp: [1] 10.0.0.30:3260,1 iqn.2020-05.world.srv:dlp.target01 (non-flash)
# confirm the partitions

root@node01:~#
cat /proc/partitions

major minor  #blocks  name

   7        0      56264 loop0
   7        1      56268 loop1
   7        2      70624 loop2
   7        3      70764 loop3
   7        4      27740 loop4
 252        0   31457280 sda
 252        1       1024 sda1
 252        2    1048576 sda2
 252        3   30405632 sda3
 253        0   26214400 dm-0
  11        0    1048575 sr0
   8        0   10485760 sdb
# added new device provided from the target server as [sdb]
[2] After setting iSCSI devide, configure on Initiator to use it like follwos.
# create label

root@node01:~#
parted --script /dev/sdb "mklabel gpt"

# create partiton

root@node01:~#
parted --script /dev/sdb "mkpart primary 0% 100%"

# format with ext4

root@node01:~#
mkfs.ext4 /dev/sdb1

mke2fs 1.45.5 (07-Jan-2020)
Creating filesystem with 2617344 4k blocks and 655360 inodes
Filesystem UUID: f4255883-6b01-4ec1-b17c-358f86df1eba
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

root@node01:~#
mount /dev/sdb1 /mnt

root@node01:~#
df -hT

Filesystem                        Type      Size  Used Avail Use% Mounted on
udev                              devtmpfs  1.9G     0  1.9G   0% /dev
tmpfs                             tmpfs     394M  1.1M  393M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv ext4       25G  2.2G   22G  10% /
tmpfs                             tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                             tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs                             tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/vda2                         ext4      976M  103M  806M  12% /boot
/dev/loop0                        squashfs   55M   55M     0 100% /snap/core18/1705
/dev/loop1                        squashfs   55M   55M     0 100% /snap/core18/1754
/dev/loop2                        squashfs   69M   69M     0 100% /snap/lxd/14804
/dev/loop3                        squashfs   70M   70M     0 100% /snap/lxd/14890
/dev/loop4                        squashfs   28M   28M     0 100% /snap/snapd/7264
/dev/sda1                         ext4      9.8G   37M  9.3G   1% /mnt
tmpfs                             tmpfs     394M     0  394M   0% /run/user/0
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