1. Example Question
system1 plays as an iSCSI target while system2 plays as an iSCSI initiator.
- system1, IP: 192.168.100.161
- system2, IP: 192.168.100.198
- system1
- iSCSI target
- iqn.2015-02.com.example:system1
- port 3260
- back store , fileio, 2GB
- only accessible to system2
- system2:
- iSCSI initiator
- iqn.2015-02.com.example:system2
- create a partition on iSCSI LUN with 1GB size
- format partition as xfs
- mount it under /mnt/data
- the mount survives reboot
2. Answer
2.1 system1
- install "targetcli" package
- yum install targetcli
- enable/start target.service
- systemctl enable target
- systemctl start target
- create iSCSI target via "targetcli"
- create backstore
- cd /backstores/fileio
- create disk1 /tmp/disk1.bin 2GB
- create iSCSI target (portals, lun, and acl)
- cd /iscsi
- create iqn.2015-02.com.example:system1
- cd iqn.2015-02.com.example:system1/tpg1/portals
- create (only for RHEL 7.0)
- cd ../luns
- create /backstores/fileio/disk1
- cd ../acl
- create iqn.2015-02.com.example:system2
- cd /
- saveconifg
- exit
- verify the portal
- ss -tln | grep 3260
- firewall
- firewall-cmd --add-service=iscsi-target --permanent # OR
- firewall-cmd --add-port=3260/tcp
- firewall-cmd --reload
- reboot the server
- reboot
2.2 system2
- install "iscsi-initiator-utils" package
- yum install iscsi-initiator-utils
- modify /etc/iscsi/initiatorname.iscsi
- vim /etc/iscsi/initiatorname.iscsi
- iqn.2015-02.com.example:system2
- enable/start iscsi.service and iscsid.service
- systemctl enable iscsi
- systemctl enable iscsid
- systemctl start iscsi
- systemctl start iscsid
- create iSCSI node with "iscsiadm"
- discovery
- iscsiadm -m discovery --type sendtargets --portal 192.168.100.161:3260
- login
- iscsiadm -m node --target iqn.2015-02.com.example:system1 --portal 192.168.100.161:3260 --login
- format and partition LUN
- lsblk to check disk name
- parted or fdisk to partition
- blkid to find the UUID
- modify /etc/fstab
- cp /etc/fstab /etc/fstab.bk
- add one line like this:
- UUID="cb251f37-4cea-49e9-89ef-d611670a5147" /mnt/data xfs _netdev 0 0
- mount -a
- reboot the server
3. Tips
- target.service vs targetd.service
- targetd.service is from "targetd" package which is a web UI for target management and not related to our task
- iscsi.service vs iscsid.service
- both are needed for this task
- Keep target online when reboot initiator
- otherwise, initiator system may hang on shutdown..
- man iscsiadm, EXAMPLE section helps alot
- targetcli's builtin help is useful
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