Konfigurasi iscsi target dan initiator di CentOS 7
ISCSI (Internet Small Computer System Interface) is a transport layer protocol that describes how Small Computer System Interface (SCSI) packets should be transported over a TCP/IP network. (source : http://searchstorage.techtarget.com/definition/iSCSI)
Definisi ISCSI
ISCSI adalah Internet Small Computer Systems Interface. sebuah penyimpanan berbasis IP selain itu ISCSI berperan untuk mengangkut data pada block level antara iscsi inisiator pada mesin klient dengan iscsi target pada mesin penyimpanan pada server.
Environtment:
Server : 192.168.122.120 (server.alanprastyo.net)
Client : 192.168.122.121 (client.alanprastyo.net)
Berikut adalah Topologi labnya:
pada tutorial kali ini saya akan membuat sebuah partisi LVM dengan kapasitas 10GB pada target server yang nantinya akan digunakan di gunakan oleh client sebagai inisiator. cek terlebih dahulu disk pada server
dari output diatas terdapat disk yang akan dijadikan sebagai iscsi target dari sisi server (/dev/vdb). sekarang kita akan membuat partisi LVM dengan ukuran 10GB pada /dev/vdb/
biasanya setelah membuat partisi baru harus merestart os terlebih dahulu, namun untuk mengatasi itu kita bisa mengunakan perintah partprobe supaya tidak perlu merestart os.
setelah itu buat LVM di partisi /dev/vdb1
Membuat ISCSI Target
untuk membuat iscsi target ada 2 opsi yaitu dengan autentikasi dan non autentikasi, pada tutorial kali ini saya akan mencoba yang autentikasi
- Install package targetcli
sekarang buat tipe block dengan nama scsi_disk_server1 dengan memanfaatkan volume group yang sudah dibuat sebelumnya
setelah itu membuat target
buat acl untuk client dimana iqn digunakan client untuk koneksi ke server
setelah itu set CHAP Auth
setelah itu buat LUN dibawah target iscsi. sebelumnya LUN harus diarahkan pada “scsi_disk1_server”
setelah itu coba verifikasi konfigurasi
setelah konfigurasi dirasa sudah sesuai, maka selanjutnya adalah save config dan exit
setelah itu restart service target dan allow port 3260 pada firewall
Membuat ISCSI Initiator dengan CHAP Auth pada client
sekarang waktunya untuk konfigruasi iscsi initiator dari sisi client dengan menginstall package berikut
edit file dibawah ini dan set nama initiatornya
setelah itu lakukan discovery target mengunakan perintah iscsiadm
setting chap auth untuk menyesuaikan settingan chap pada server target
restart service iscsi
kemudian login discovery target
setelah itu cek pada log /var/log/messages
selain itu kita bisa melihat list partisi hardisk
setelah itu format disk /dev/sda supaya bisa di mounting ke folder
kemudian mounting /dev/sda ke folder /mnt
kemudian verifikasi disk yang sudah termounting
sudah berhasil disk dari server sudah bisa diakses oleh client sebagai block storage mengunakan protocol iscsi. namun jika anda ingin mengembalikan disk yang ada pada client ke server bisa lakukan cara berikut ini
selanjutnya bisa diverifikasi dengan fdisk -l
sekarang sudah tidak ada disk /dev/sda, karena sudah di release ke server.
Cukup sekian tutorial kali ini semoga bermanfaat, wassalamualaikum 
Ref : http://www.itzgeek.com/how-tos/linux/centos-how-tos/configure-iscsi-target-initiator-on-centos-7-rhel7.html#fscreate
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iSCSI stands for Internet Small Computer Systems Interface, IP-based storage, works on top of internet protocol by carrying SCSI commands over IP network. iSCSI transports block-level data between an iSCSI initiator on a client machine and an iSCSI target on a storage device (server).
iSCSI storage is used as shared storage in Redhat cluster, VMware vSphere, Redhat Enterprise Virtualization Manager, Ovirt, etc.
Environment
Server: server.itzgeek.local
IP Address: 192.168.12.20
OS: CentOS Linux release 7.4.1708 (Core)
Client: node1.itzgeek.local
IP Address: 192.168.12.11
OS: CentOS Linux release 7.4.1708 (Core)
Storage Configuration
Here, we will create 5GB of LVM disk on the target server to use as shared storage for clients. Let’s list the available disks attached to the target server using below command. If you want to use the whole disk for LVM, then skip the disk partitioning step.
[root@server ~]# fdisk -l | grep -i sd
Output:
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 209715199 104344576 8e Linux LVM
Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 sectors
From the above output, you can see that my system has a 10GB of disk (/dev/sdb). We will create a 5GB partition on the above disk and will use it for LVM.
[root@server ~]# fdisk /dev/sdb Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Device does not contain a recognized partition table Building a new DOS disklabel with disk identifier 0x173dfa4d. Command (m for help): n --> New partition Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): p --> Pimary partition Partition number (1-4, default 1): 1 - -> Partition number First sector (2048-20971519, default 2048): --> Just enter Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): +5G --> Enter the size Partition 1 of type Linux and of size 5 GiB is set Command (m for help): t --> Change label Selected partition 1 Hex code (type L to list all codes): 8e --> Change it as LVM label Changed type of partition 'Linux' to 'Linux LVM' Command (m for help): w --> Save The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.
Create a LVM with /dev/sdb1 partition (replace /dev/sdb1 with your disk name)
[root@server ~]# pvcreate /dev/sdb1 [root@server ~]# vgcreate vg_iscsi /dev/sdb1 [root@server ~]# lvcreate -l 100%FREE -n lv_iscsi vg_iscsi
Configure iSCSI target
Now you have an option of creating target either with or without authentication. In this article, you can find steps for both scenarios. It is up to you to decide which one is suitable for your environment.
Here, will configure iSCSI target without CHAP authentication.
Install the targetcli package on the server.
[root@server ~]# yum install targetcli -y
Once you installed the package, enter below command to get an iSCSI CLI for an interactive prompt.
[root@server ~]# targetcli Warning: Could not load preferences file /root/.targetcli/prefs.bin. targetcli shell version 2.1.fb41 Copyright 2011-2013 by Datera, Inc and others. For help on commands, type 'help'. >
Now use an existing logical volume (/dev/vg_iscsi/lv_iscsi) as a block-type backing store for storage object scsi_disk1_server“.
/> cd backstores/block /backstores/block> create scsi_disk1_server /dev/vg_iscsi/lv_iscsi Created block storage object scsi_disk1_server using /dev/vg_iscsi/lv_iscsi.
Create a target.
/backstores/block> cd /iscsi /iscsi> create iqn.2016-02.local.itzgeek.server:disk1 Created target iqn.2016-02.local.itzgeek.server:disk1. Created TPG 1. Global pref auto_add_default_portal=true Created default portal listening on all IPs (0.0.0.0), port 3260. /iscsi>
Create ACL for client machine (It’s the IQN which clients use to connect).
/iscsi> cd /iscsi/iqn.2016-02.local.itzgeek.server:disk1/tpg1/acls /iscsi/iqn.20...sk1/tpg1/acls> create iqn.2016-02.local.itzgeek.server:node1node2 Created Node ACL for iqn.2016-02.local.itzgeek.server:node1node2
Create a LUN under the target. The LUN should use the previously mentioned backing storage object named “scsi_disk1_server“.
/iscsi/iqn.20...er:disk1/tpg1> cd /iscsi/iqn.2016-02.local.itzgeek.server:disk1/tpg1/luns /iscsi/iqn.20...sk1/tpg1/luns> create /backstores/block/scsi_disk1_server Created LUN 0. Created LUN 0->0 mapping in node ACL iqn.2016-02.local.itzgeek.server:node1node2
Verify the target server configuration.
/iscsi/iqn.20.../tpg1/portals> cd / /> ls o- / ......................................................................................................................... [...] o- backstores .............................................................................................................. [...] | o- block .................................................................................................. [Storage Objects: 1] | | o- scsi_disk1_server .................................................. [/dev/vg_iscsi/lv_iscsi (5.0GiB) write-thru activated] | o- fileio ................................................................................................. [Storage Objects: 0] | o- pscsi .................................................................................................. [Storage Objects: 0] | o- ramdisk ................................................................................................ [Storage Objects: 0] o- iscsi ............................................................................................................ [Targets: 1] | o- iqn.2016-02.local.itzgeek.server:disk1 ............................................................................ [TPGs: 1] | o- tpg1 .................................................................................................. [gen-acls, no-auth] | o- acls .......................................................................................................... [ACLs: 1] | | o- iqn.2016-02.local.itzgeek.server:node1node2 .......................................................... [Mapped LUNs: 1] | | o- mapped_lun0 ..................................................................... [lun0 block/scsi_disk1_server (rw)] | o- luns .......................................................................................................... [LUNs: 1] | | o- lun0 ............................................................... [block/scsi_disk1_server (/dev/vg_iscsi/lv_iscsi)] | o- portals .................................................................................................... [Portals: 1] | o- 0.0.0.0:3260 ..................................................................................................... [OK] o- loopback ......................................................................................................... [Targets: 0]Save and exit from target CLI.
/> saveconfig Last 10 configs saved in /etc/target/backup. Configuration saved to /etc/target/saveconfig.json /> exit Global pref auto_save_on_exit=true Last 10 configs saved in /etc/target/backup. Configuration saved to /etc/target/saveconfig.json
Enable and restart the target service.
[root@server ~]# systemctl enable target.service [root@server ~]# systemctl restart target.service
Configure the firewall to allow iSCSI traffic.
[root@server ~]# firewall-cmd --permanent --add-port=3260/tcp [root@server ~]# firewall-cmd --reload
Configure Initiator
Now, it’s the time to configure a client machine to use the created target as storage. Install the below package on the client machine (node1).
[root@node1 ~]# yum install iscsi-initiator-utils -y
Edit the initiatorname.iscsi file.
[root@node1 ~]# vi /etc/iscsi/initiatorname.iscsi
Add the iSCSI initiator name.
InitiatorName=iqn.2016-02.local.itzgeek.server:node1node2
Discover the target using the below command.
[root@node1 ~]# iscsiadm -m discovery -t st -p 192.168.12.20
Output:
192.168.12.20:3260,1 iqn.2016-02.local.itzgeek.server:disk1
Restart and enable the initiator service.
[root@node1 ~]# systemctl restart iscsid.service [root@node1 ~]# systemctl enable iscsid.service
Login to the discovered target.
[root@node1 ~]# iscsiadm -m node -T iqn.2016-02.local.itzgeek.server:disk1 -p 192.168.12.20 -l
Output:
Logging in to [iface: default, target: iqn.2016-02.local.itzgeek.server:disk1, portal: 192.168.12.20,3260] (multiple) Login to [iface: default, target: iqn.2016-02.local.itzgeek.server:disk1, portal: 192.168.12.20,3260] successful.
Create File System on ISCSI Disk
After login (connecting) to discovered target, have a look at messages file. You would find similar output like below, from where you can find a name of the disk.
[root@node1 ~]# cat /var/log/messages
Feb 23 14:54:47 node2 kernel: sd 34:0:0:0: [sdb] 10477568 512-byte logical blocks: (5.36 GB/4.99 GiB)
Feb 23 14:54:47 node2 kernel: sd 34:0:0:0: [sdb] Write Protect is off
Feb 23 14:54:47 node2 kernel: sd 34:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
Feb 23 14:54:48 node2 kernel: sdb: unknown partition table
Feb 23 14:54:48 node2 kernel: sd 34:0:0:0: [sdb] Attached SCSI disk
Output:
Feb 23 14:54:48 node2 iscsid: Could not set session2 priority. READ/WRITE throughout and latency could be affected. Feb 23 14:54:48 node2 iscsid: Connection2:0 to [target: iqn.2016-02.local.itzgeek.server:disk1, portal: 192.168.12.20,3260] through [iface: default] is operational now
List down the attached disks.
[root@node1 ~]# cat /proc/partitions
Output:
major minor #blocks name
8 0 104857600 sda
8 1 512000 sda1
8 2 104344576 sda2
11 0 1048575 sr0
253 0 2113536 dm-0
253 1 52428800 dm-1
253 2 49799168 dm-2
8 16 5238784 sdb
Format the new disk (for the sake of article, I have formatted whole disk instead of creating partition)
root@node1 ~]# mkfs.xfs /dev/sdb
Output:
meta-data=/dev/sdb isize=256 agcount=8, agsize=163712 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=1309696, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
Mount the disk.
[root@node1 ~]# mount /dev/sdb /mnt
Verify the disk is mounted using the below command.
[root@node1 ~]# df -hT
Output:
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 50G 955M 50G 2% /
devtmpfs devtmpfs 908M 0 908M 0% /dev
tmpfs tmpfs 914M 54M 861M 6% /dev/shm
tmpfs tmpfs 914M 8.5M 905M 1% /run
tmpfs tmpfs 914M 0 914M 0% /sys/fs/cgroup
/dev/mapper/centos-home xfs 48G 33M 48G 1% /home
/dev/sda1 xfs 497M 97M 401M 20% /boot
/dev/sdb xfs 5.0G 33M 5.0G 1% /mnt
Automount iSCSI storage
To automount the iSCSI storage during every reboot, you would need to make an entry in /etc/fstab file.
Before updating the /etc/fstab file, get the UUID of the iSCSI disk using the following command. Replace /dev/sdb with your iSCSI disk name.
blkid /dev/sdb
Output:
/dev/sdb: LABEL="/" UUID="9df472f4-1b0f-41c0-a6eb-89574d2caee3" TYPE="xfs"
Now, edit the /etc/fstab file.
vi /etc/fstab
Make an entry something like below.
#
# /etc/fstab
# Created by anaconda on Tue Jan 30 02:14:21 2018
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=9df472f4-1b0f-41c0-a6eb-89574d2caee3 / xfs defaults 0 0
UUID=c7469f92-75ec-48ac-b42d-d5b89ab75b39 /mnt xfs _netdev 0 0
Remove iSCSI storage
In case you want to de-attach the added disk, please follow the procedure (unmount and logout).
[root@node1 ~]# umount /mnt/ [root@node1 ~]# iscsiadm -m node -T iqn.2016-02.local.itzgeek.server:disk1 -p 192.168.12.20 -u
Output:
Logging out of session [sid: 1, target: iqn.2016-02.local.itzgeek.server:disk1, portal: 192.168.12.20,3260] Logout of [sid: 1, target: iqn.2016-02.local.itzgeek.server:disk1, portal: 192.168.12.20,3260] successful.
That’s All.
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