How to Configure ISCI Target& Initiator on REHEL7 скачать в хорошем качестве

How to Configure ISCI Target& Initiator on REHEL7

Step_By_Step_GUIDE To Configure ISCSI Target and Initiator on RHEL07 1: set hostname hostnamectl set-hostname iscsihost.example.local 2: Install packages. On Target: Package: targetcli Provides the targetcli shell to configure LIO (Linux I/O Target), the in-kernel iSCSI target framework yum install targetcli On Initiator: yum install iscsi-initiator-utils Provides iscsiadm, iscsid, and related tools to discover and log in to iSCSI targets. 3: Enter targetcli shell. targetcli ls It will show: BLOCK = Block-device based LUN Storage Space like Disk e.g. /dev/sdb. FILEIO = File based LUN Storage Space like file created with dd command. PSCSI = (SCSI Pass-through) Physical Disk based LUN Storage Space like CD-ROM. RamDisk= Ramdisk based LUN Storage Space for higher IO speed 4: Create a Backstore. /backstores/block create backstore01 /dev/sdb ls 5: Create ISCI Target /iscsi create This will : • Creates a new iSCSI target node under /iscsi • Assigns it a unique IQN (iSCSI Qualified Name) • Initializes a TPG (Target Portal Group) called tpg1 • Prepares the structure where you’ll later: • Add LUNs • Configure ACLs • Set portals (IP + port) • Enable authentication A TPG is a container inside an iSCSI target that defines how initiators connect to the target. 6: Exposes a real disk (block device) to iSCSI clients by attaching it as a LUN under the target. /iscsi/iqn.2003-01.org.linux-iscsi.server.x8664:sn.89b50c23d34a/tpg1/luns create /backstores/block/backstore ls 7: Allows a specific iSCSI initiator to access your target. Go to Client & Copy IQN Number with cp /etc/iscsi/initiatorname.iscsi & return to Host** Client Terminal: cat /etc/iscsi/initiatorname.iscsi Host Terminal: where you left before moving to client terminal: /iscsi/iqn.2003-01.org.linux-iscsi.server.x8664:sn.89b50c23d34a/tpg1/acls create iqn.1994-05.com.redhat:3e9d906e8 ls exit 8: If firewalld is enabled, add port 3260/tcp to firewall rules. sudo firewall-cmd --permanent --add-port=3260/tcp sudo firewall-cmd --reload Client Configuration: (RHEL 7): 1: Set host Name hostnamectl set-hostname initiator.example.local hostnamectl 2: install packages yum install -y iscsi-initiator-utils 3: Check available Disks lsblk OR fdisk -l 4: Run Following Commands iscsiadm --help 5: Dicover Target: iscsiadm -m discovery -t sendtargets -p 192.168.1.104 • -m discovery → use discovery mode • -t sendtargets → use the SendTargets discovery method • -p 192.168.1.104 → IP of the iSCSI target server Discovery does NOT log in. It only lists available targets. 6: Login Target: iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.server.x8664:sn.89b50c23d34a 192.168.1.104 -l • -m node → operate on a discovered node • -T → specify which target to log in to • 192.168.1.104 → target portal IP • -l → login 📌 Result • A session is created • The kernel receives a new SCSI device • You will see a new disk (e.g., ) Check with: lsblk OR fdisk -l OR cat /proc/scsi/scsi **TEST WITH ** mkdir -p /newdev mkfs.ext4 /dev/sdb mount /dev/sdb /newdev cd /newdev touch test{1..10}.txt mkdir aa bb cc dd ls -lh To log out of the active session: sudo iscsiadm -m node -T iqn.2026-01.sa.lab:storage.target01 -p 192.168.10.10 --logout What this does: • Terminates the iSCSI session • Removes the LUN from (e.g., disappears) • Ensures the initiator is no longer connected to the target You can verify with: sudo iscsiadm -m session Remove the discovered target (delete node record) Discovery creates a node record under /etc/iscsi/nodes/. . If you want to remove it completely: sudo iscsiadm -m node -T iqn.2026-01.sa.lab:storage.target01 -p 192.168.10.10 -o delete What this does: Deletes the saved configuration for that target Removes auto‑login settings Removes CHAP settings (if configured) Removes the target from the initiator’s database After this, the initiator “forgets” the target. 👉Follow my LinkdIn Profile: www.linkedin.com/in/muhammad-shaban-45577719a 👉Youtube Channel:    / @engrm.shaban5099