iSCSI : Configure iSCSI Initiator in Linux

 Thank to: https://www.server-world.info/

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.2022-04.world.srv:node01.initiator01 root@node01:~#  vi /etc/iscsi/iscsid.conf # line 58 : uncomment node.session.auth.authmethod = CHAP # line 69,70: 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.2022-04.world.srv:dlp.target01 # confirm status after discovery root@node01:~#  iscsiadm -m node -o show # BEGIN RECORD 2.1.5 node.name = iqn.2022-04.world.srv:dlp.target01 node.tpgt = 1 node.startup = manual node.leading_login = No iface.iscsi_ifacename = default ..... ..... node.conn[0].iscsi.DataDigest = None node.conn[0].iscsi.IFMarker = No node.conn[0].iscsi.OFMarker = No # END RECORD # login to the target root@node01:~#  iscsiadm -m node --login -p 10.0.0.30 Logging in to [iface: default, target: iqn.2022-04.world.srv:dlp.target01, portal: 10.0.0.30,3260] Login to [iface: default, target: iqn.2022-04.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.2022-04.world.srv:dlp.target01 (non-flash) # if enable automatic login for system starting, set like follows root@node01:~#  iscsiadm -m node -p 10.0.0.30 -o update -n node.startup -v automatic # confirm the partitions root@node01:~#  cat /proc/partitions major minor #blocks name 7 0 81868 loop0 7 1 63380 loop1 7 2 45748 loop2 252 0 31457280 sda 252 1 1024 sda1 252 2 2097152 sda2 252 3 29357056 sda3 253 0 28311552 dm-0 8 0 10485760 sdb # added new device provided from the target server as [sdb]

[2]	After setting iSCSI device, configure on Initiator to use it like follows.

# create label root@node01:~#  parted --script /dev/sdb "mklabel gpt" # create partition root@node01:~#  parted --script /dev/sdb "mkpart primary 0% 100%" # format with ext4 root@node01:~#  mkfs.ext4 /dev/sdb1 mke2fs 1.46.5 (30-Dec-2021) Creating filesystem with 2617344 4k blocks and 655360 inodes Filesystem UUID: 6eec40d4-a75c-4a6e-97eb-cfb545d696ee 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 tmpfs tmpfs 393M 1.1M 392M 1% /run /dev/mapper/ubuntu--vg-ubuntu--lv ext4 27G 5.7G 20G 23% / tmpfs tmpfs 2.0G 0 2.0G 0% /dev/shm tmpfs tmpfs 5.0M 0 5.0M 0% /run/lock /dev/sda2 ext4 2.0G 125M 1.7G 7% /boot tmpfs tmpfs 393M 4.0K 393M 1% /run/user/0 /dev/sdb1 ext4 9.8G 24K 9.3G 1% /mnt