This article will describe installing scsi-target-utils which provides iSCSI target.
Table of Contents
1 Install scsi-target-utils
Install scsi-target-utils package.
$ sudo dnf install -y scsi-target-utils $ sudo firewall-cmd --add-service=iscsi-target --permanent $ sudo firewall-cmd --reload $ sudo systemctl enable tgtd $ sudo systemctl restart tgtd
Add SELinux configuration for creating Logical unit to /var/lib/iscsi.
$ cat <<EOF > tgtd-var-lib.te
module tgtd-var-lib 1.0;
require {
type iscsi_var_lib_t;
type tgtd_t;
class file { open read write getattr };
class dir { search };
}
#============= tgtd_t ==============
allow tgtd_t iscsi_var_lib_t:file { open read write getattr };
allow tgtd_t iscsi_var_lib_t:dir { search };
EOF
$ checkmodule -M -m -o tgtd-var-lib.mod tgtd-var-lib.te
$ semodule_package -m tgtd-var-lib.mod -o tgtd-var-lib.pp
$ sudo semodule -i tgtd-var-lib.pp
$ rm -f tgtd-var-lib.te tgtd-var-lib.mod tgtd-var-lib.pp
2 Create iSCSI target
This article uses a file as logical unit. You can use block device as logical unit.
$ sudo dd if=/dev/zero of=/var/lib/iscsi/debian-9 bs=1M count=1K
Create iSCSI target (tid 1).
$ sudo tgtadm --lld iscsi --op new --mode target --tid 1 \
-T iqn.2017-07.com.hiroom2:debian-9
Add logical Unit (lun 1) to iSCSI target (Target ID 1).
$ sudo tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 \
-b /var/lib/iscsi/debian-9
Publish iSCSI target (tid 1) to all IP address. You can specify 192.168.11.1 and 192.168.11.0/24 in addition to ALL.
$ sudo tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
Save configuration for iSCSI target. If you do not save configuration, configuration will be removed after restarting tgtd.
$ sudo tgtadm --dump | sudo tee /etc/tgt/conf.d/debian-9.conf
3 Connect to iSCSI target with iscsi-initiator-utils which is iSCSI initiator
iSCSI initiator runs on server which is installed iSCSI target.
The partition is the following before connecting to iSCSI target.
$ cat /proc/partitions major minor #blocks name 254 0 10485760 vda 254 1 248832 vda1 254 2 1 vda2 254 5 10233856 vda5 11 0 1048575 sr0 253 0 9183232 dm-0 253 1 1048576 dm-1
Install iscsi-initiator-utils package.
$ sudo dnf install -y iscsi-initiator-utils
Get iSCSI target list.
$ sudo iscsiadm -m discovery -t st -p localhost [::1]:3260,1 iqn.2017-07.com.hiroom2:debian-9
Connect to iSCSI target.
$ sudo iscsiadm -m node \
--targetname iqn.2017-07.com.hiroom2:debian-9 -p localhost -l
Logging in to [iface: default, target:
iqn.2017-07.com.hiroom2:debian-9, portal: ::1,3260] (multiple)
Login to [iface: default, target:
iqn.2017-07.com.hiroom2:debian-9, portal: ::1,3260]
successful.
The partition is the following after connecting to iSCSI target. The partition sda is appended.
$ cat /proc/partitions major minor #blocks name 254 0 10485760 vda 254 1 248832 vda1 254 2 1 vda2 254 5 10233856 vda5 11 0 1048575 sr0 253 0 9183232 dm-0 253 1 1048576 dm-1 8 0 1048576 sda