ISCSI. AlmaLinux 8. ISCSI-Initiator
Links
https://computingforgeeks.com/how-to-configure-iscsi-initiator-on-centos-rhel/
Configuring
Connect to target and mount a device
Install
dnf -y install iscsi-initiator-utils
Target path
nano /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2023-01.alef:vmail
Login and password for target (CHAP only)
nano /etc/iscsi/iscsid.conf
... node.session.auth.username = vmail node.session.auth.password = PassWord ...
Discovery target (target discovery auth disabled)
iscsiadm -m discovery -t sendtargets -p 192.168.199.250
... 192.168.199.250:3260,1 iqn.2023-01.alef:vmail ...
Target info
iscsiadm -m node -o show
Login to ALL targets
iscsiadm -m node --login
... Logging in to [iface: default, target: iqn.2023-01.alef:vmail, portal: 192.168.199.250,3260] Login to [iface: default, target: iqn.2023-01.alef:vmail, portal: 192.168.199.250,3260] successful. ...
Login to specific targets
iscsiadm -m node --login --targetname iqn.2023-01.alef:vmail.zfs -p 192.168.199.250,3260
Show connected session info
iscsiadm -m session -o show
... tcp: [6] 192.168.199.250:3260,1 iqn.2023-01.alef:vmail (non-flash) ...
Show connected block device
lsblk
... sdb 8:16 0 100G 0 disk ...
Create partition
fdisk /dev/sdb
n - Next - Next...
Create FS
mkfs.ext4 /dev/sdb1
Getting partition UUID
blkid
... /dev/sdb1: UUID="d13097d0-1b54-47b0-b504-ffc56d9bceff" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="797c5bc8-01" ...
Auto mount after OS boot
mkdir /var/vmail
nano /etc/fstab
... # iscsi vmail UUID="d13097d0-1b54-47b0-b504-ffc56d9bceff" /var/vmail ext4 _netdev 0 0 ...
reboot
df -h
... /dev/sdb1 98G 4.1G 89G 5% /var/vmail ...
Unmount and disconnect a target
Unmount device
umount /var/vmail
Logout target
iscsiadm --mode node --targetname iqn.2023-01.alef:vmail --portal 192.168.199.250 -u
... Logging out of session [sid: 1, target: iqn.2023-01.alef:vmail, portal: 192.168.199.250,3260] Logout of [sid: 1, target: iqn.2023-01.alef:vmail, portal: 192.168.199.250,3260] successful. ...
Delete connection
iscsiadm --mode node --targetname iqn.2023-01.alef:vmail --portal 192.168.199.250 -o delete
Increase a size of the an extent (block device)
Server ISCSI-target
Increase size of the extent
For example, on Nas4free you just have to type bigger size of the file-extent instead of old size of the file-extent in the web-interface and restart ISCSI-target service
Client ISCSI-initiator
Unmount device (don't logout from target, otherwise you wil not be able to work with sdb - it will disappear)
umount /dev/sdb1
Run parted util
parted
Select device
> select /dev/sdb
Get device full size (it will be bigger than actual size)
> print
... Disk /dev/sdb: 129GB ...
Increaze size to full disk size
> resizepart 1 129GB
Exit
> quit
Increase FS size
resize2fs /dev/sdb1
Mount device
mount /dev/sdb1
Check new size
df -h
... /dev/sdb1 118G 4.1G 108G 4% /var/vmail ...
Success!