tgtadm配置

环境：
centos 6.9
iSCSI Target：192.168.56.150 + scsi-target-utils

iSCSI Initiator:
192.168.56.151 + iscsi-initiator-utils

一.服务器端配置
1. 准备要共享出去的设备，我们这里将/dev/sdb共享出去

[root@tgtamd-server ~]# fdisk -l

Disk /dev/sda: 37.6 GB, 37580963840 bytes
255 heads, 63 sectors/track, 4568 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0009da7b

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64         587     4194304   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3             587        4569    31992832   8e  Linux LVM

Disk /dev/sdb: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vgroot-lvroot: 32.8 GB, 32757514240 bytes
255 heads, 63 sectors/track, 3982 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

 

2.安装SCSI服务端

[root@localhost ~]# yum install -y scsi-target-utils

 

3.启动服务并查看

[root@tgtamd-server ios]# service tgtd start
Starting SCSI target daemon: [ OK ]

[root@tgtamd-server ios]# chkconfig tgtd on

[root@tgtamd-server ios]# netstat -tnlp | grep :3260
tcp 0 0 0.0.0.0:3260 0.0.0.0:* LISTEN 2418/tgtd
tcp 0 0 :::3260 :::* LISTEN 2418/tgtd

 

4.新建一个target并查看

[root@tgtamd-server ios]# tgtadm -L iscsi -o new -m target -t 1 -T iqn.hxl.com.test

[root@tgtamd-server ios]# tgtadm -L iscsi -o show -m target
Target 1: iqn.hxl.com.test
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
    Account information:
    ACL information:

 

然后必须向target中添加lun并关联存储设备才能被客户端访问使用;

 

5.创建一个lun

[root@tgtamd-server ios]# tgtadm -L iscsi -o new -m logicalunit -t 1 -l 1 -b /dev/sdb
[root@tgtamd-server ios]# tgtadm -L iscsi -o show -m target
Target 1: iqn.hxl.com.test
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
        LUN: 1
            Type: disk
            SCSI ID: IET     00010001
            SCSI SN: beaf11
            Size: 4295 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/sdb
            Backing store flags:
    Account information:
    ACL information:

 

lun0是一个controller,而lun1则是一个磁盘;

 

6.开放给192.168.56.0/24网段内的主机访问

[root@tgtamd-server ios]# tgtadm -L iscsi -o bind -m target -t 1 -I 192.168.56.0/24
[root@tgtamd-server ios]# tgtadm -L iscsi -o show -m target
Target 1: iqn.hxl.com.test
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
        LUN: 1
            Type: disk
            SCSI ID: IET     00010001
            SCSI SN: beaf11
            Size: 4295 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/sdb
            Backing store flags: 
    Account information:
    ACL information:
        192.168.56.0/24

7.写到配置文件，使重启后生效

将设置保存到配置文件 tgt-admin --dump > /etc/tgt/targets.conf
查看配置 tgt-admin -dump

 

二.客户端配置

1.安装SCSI客户端
[root@node2 ~]# yum install -y iscsi-initiator-utils

2.初始化，为每个initiator命名并放在/etc/iscsi/下
2.1可以自动生成
[root@tgtamd-client mnt]# echo "InitiatorName=`iscsi-iname -p iqn.hxl.com.test`" > /etc/iscsi/initiatorname.iscsi

[root@tgtamd-client mnt]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.hxl.com.test:686d0a1af5b

2.2或者为了方便记忆自定义别名
[root@tgtamd-client mnt]# echo "InitiatorAlias=initiator1" >> /etc/iscsi/initiatorname.iscsi

[root@tgtamd-client mnt]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.hxl.com.test:686d0a1af5b
InitiatorAlias=initiator1

 

3.启动服务
[root@tgtamd-client mnt]# service iscsi start
[root@tgtamd-client mnt]# service iscsid start
[root@tgtamd-client mnt]# chkconfig iscsi on
[root@tgtamd-client mnt]# chkconfig iscsid on

 

4.查找Target
关闭防火墙(服务端和客户端都需要关闭)
[root@tgtamd-client mnt]# service iptables stop
[root@tgtamd-client mnt]# chkconfig iptables off

[root@tgtamd-client mnt]# iscsiadm -m discovery -t st -p 192.168.56.150
192.168.56.150:3260,1 iqn.hxl.com.test

 

5.此时只是能找到，但还不能使用，所以，接下来要登录并使用；
5.1 先查看此时客户端的分区情况

[root@tgtamd-client mnt]# fdisk -l

Disk /dev/loop0: 3972 MB, 3972005888 bytes
64 heads, 32 sectors/track, 3788 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0dba0805

      Device Boot      Start         End      Blocks   Id  System
/dev/loop0p1   *           1        3788     3878912   17  Hidden HPFS/NTFS

Disk /dev/sda: 37.6 GB, 37580963840 bytes
255 heads, 63 sectors/track, 4568 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004fba2

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64         587     4194304   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3             587        4569    31992832   8e  Linux LVM

Disk /dev/mapper/vgroot-lvroot: 32.8 GB, 32757514240 bytes
255 heads, 63 sectors/track, 3982 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

 

5.2 登录服务器端使用其共享的磁盘(分区)

[root@tgtamd-client mnt]# iscsiadm -m node -T iqn.hxl.com.test -p 192.168.56.150 -l
Logging in to [iface: default, target: iqn.hxl.com.test, portal: 192.168.56.150,3260] (multiple)
Login to [iface: default, target: iqn.hxl.com.test, portal: 192.168.56.150,3260] successful.

 

5.3 此时的分区情况

[root@tgtamd-client mnt]# fdisk -l

Disk /dev/loop0: 3972 MB, 3972005888 bytes
64 heads, 32 sectors/track, 3788 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0dba0805

      Device Boot      Start         End      Blocks   Id  System
/dev/loop0p1   *           1        3788     3878912   17  Hidden HPFS/NTFS

Disk /dev/sda: 37.6 GB, 37580963840 bytes
255 heads, 63 sectors/track, 4568 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004fba2

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64         587     4194304   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3             587        4569    31992832   8e  Linux LVM

Disk /dev/mapper/vgroot-lvroot: 32.8 GB, 32757514240 bytes
255 heads, 63 sectors/track, 3982 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/sdb: 4294 MB, 4294967296 bytes
133 heads, 62 sectors/track, 1017 cylinders
Units = cylinders of 8246 * 512 = 4221952 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

 

6. 然后将/dev/sdb格式化

[root@node2 ~]# mke2fs -t ext4 /dev/sdb

挂载
[root@tgtamd-client /]#cd /
[root@tgtamd-client /]# mkdir media
[root@tgtamd-client /]# mount /dev/sdb /media/
[root@tgtamd-client /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vgroot-lvroot
30G 7.1G 22G 25% /
tmpfs 2.9G 300K 2.9G 1% /dev/shm
/dev/sda1 477M 41M 411M 10% /boot
/soft/ios/CentOS-6.9-x86_64-bin-DVD1.iso
3.7G 3.7G 0 100% /mnt
/dev/sdb 3.9G 8.0M 3.7G 1% /media

[root@tgtamd-client media]# echo aa>a.txt
[root@tgtamd-client media]# more a.txt
aa

 

7.登出节点
iscsiadm -m node -T iqn.2015-11.com.a.test -p 192.168.85.128 -u

[root@tgtamd-client media]# iscsiadm -m node -T iqn.hxl.com.test -p 192.168.56.150 -u
Logging out of session [sid: 1, target: iqn.hxl.com.test, portal: 192.168.56.150,3260]
Logout of [sid: 1, target: iqn.hxl.com.test, portal: 192.168.56.150,3260] successful.

 

这个时候无法访问挂载的目录
[root@tgtamd-client media]# ls
ls: reading directory .: Input/output error

将挂载点umount
[root@tgtamd-client /]# umount /media

 

重新登录
[root@tgtamd-client /]# iscsiadm -m node -T iqn.hxl.com.test -p 192.168.56.150 -l
Logging in to [iface: default, target: iqn.hxl.com.test, portal: 192.168.56.150,3260] (multiple)
Login to [iface: default, target: iqn.hxl.com.test, portal: 192.168.56.150,3260] successful.

重新挂载
[root@tgtamd-client /]# mount /dev/sdb /media/
之前的文件是可以查看得到的
[root@tgtamd-client media]# ls
a.txt lost+found