Using iSCSI On Ubuntu 10.04 (Initiator And Target)

This guide explains how you can set up an iSCSI target and an iSCSI initiator (client), both running Ubuntu 10.04. The iSCSI protocol is a storage area network (SAN) protocol which allows iSCSI initiators to use storage devices on the (remote) iSCSI target using normal ethernet cabling. To the iSCSI initiator, the remote storage looks like a normal, locally-attached hard drive.

I do not issue any guarantee that this will work for you!

1. Preliminary Note

I‘m using two Ubuntu 10.04 servers here:

  • server1.example.com (Initiator): IP address 192.168.0.100

  • server2.example.com (Target): IP address 192.168.0.101

Because we will run all the steps from this tutorial with root privileges, we can either prepend all commands in this tutorial with the string sudo, or we become root right now by typing

sudo su

2. Setting Up The Target (server2)

server2:

First we set up the target (server2):

aptitude install iscsitarget

Open /etc/default/iscsitarget...

vi /etc/default/iscsitarget

... and set ISCSITARGET_ENABLE to true:

ISCSITARGET_ENABLE=true

We can use unused logical volumes, image files, hard drives (e.g. /dev/sdb), hard drive partitions (e.g. /dev/sdb1) or RAID devices (e.g. /dev/md0) for the storage. In this example I will create a logical volume of 20GB named storage_lun1 in the volume group vg0:

lvcreate -L20G -n storage_lun1 vg0

(If you want to use an image file, you can create it as follows:

mkdir /storage
dd if=/dev/zero of=/storage/lun1.img bs=1024k count=20000

This creates the image file /storage/lun1.img with a size of 20GB.

)

Next we edit /etc/ietd.conf...

vi /etc/ietd.conf

... and comment out everything in that file. At the end we add the following stanza:

[...]
Target iqn.2001-04.com.example:storage.lun1
        IncomingUser someuser secret
        OutgoingUser
        Lun 0 Path=/dev/vg0/storage_lun1,Type=fileio
        Alias LUN1
        #MaxConnections  6

The target name must be a globally unique name, the iSCSI standard defines the "iSCSI Qualified Name" as follows: iqn.yyyy-mm.<reversed domain name>[:identifier]; yyyy-mm is the date at which the domain is valid; the identifier is freely selectable. The IncomingUser line contains a username and a password so that only the initiators (clients) that provide this username and password can log in and use the storage device; if you don‘t need authentication, don‘t specify a username and password in the IncomingUser line. In the Lun line, we must specify the full path to the storage device (e.g. /dev/vg0/storage_lun1, /storage/lun1.img, /dev/sdb, etc.).

Now we tell the target that we want to allow connections to the device iqn.2001-04.com.example:storage.lun1 from the IP address 192.168.0.100 (server1.example.com) (comment out the ALL ALL line because that would allow all initiators to connect to all targets)...

vi /etc/initiators.allow

[...]
iqn.2001-04.com.example:storage.lun1 192.168.0.100
#ALL ALL

... and start the target:

/etc/init.d/iscsitarget start

3. Setting Up The Initiator (server1)

server1:

On server1, we install the initiator:

aptitude install open-iscsi

Next we open /etc/iscsi/iscsid.conf...

vi /etc/iscsi/iscsid.conf

... and set node.startup to automatic:

[...]
node.startup = automatic
[...]

Then we restart the initiator:

/etc/init.d/open-iscsi restart

Now we connect to the target (server2) and check what storage devices it has to offer:

iscsiadm -m discovery -t st -p 192.168.0.101

[email protected]:~# iscsiadm -m discovery -t st -p 192.168.0.101
192.168.0.101:3260,1 iqn.2001-04.com.example:storage.lun1
[email protected]:~#

iscsiadm -m node

[email protected]:~# iscsiadm -m node
192.168.0.101:3260,1 iqn.2001-04.com.example:storage.lun1
[email protected]:~#

The settings for the storage device iqn.2001-04.com.example:storage.lun1 on 192.168.0.101:3260,1 are stored in the file /etc/iscsi/nodes/iqn.2001-04.com.example:storage.lun1/192.168.0.101,3260,1/default. We need to set the username and password for the target in that file; instead of editing that file manually, we can use the iscsiadm command to do this for us:

iscsiadm -m node --targetname "iqn.2001-04.com.example:storage.lun1" --portal "192.168.0.101:3260" --op=update --name node.session.auth.authmethod --value=CHAP
iscsiadm -m node --targetname "iqn.2001-04.com.example:storage.lun1" --portal "192.168.0.101:3260" --op=update --name node.session.auth.username --value=someuser
iscsiadm -m node --targetname "iqn.2001-04.com.example:storage.lun1" --portal "192.168.0.101:3260" --op=update --name node.session.auth.password --value=secret

Now we can log in, either by running...

iscsiadm -m node --targetname "iqn.2001-04.com.example:storage.lun1" --portal "192.168.0.101:3260" --login

[email protected]:~# iscsiadm -m node --targetname "iqn.2001-04.com.example:storage.lun1" --portal "192.168.0.101:3260" --login
Logging in to [iface: default, target: iqn.2001-04.com.example:storage.lun1, portal: 192.168.0.101,3260]
Login to [iface: default, target: iqn.2001-04.com.example:storage.lun1, portal: 192.168.0.101,3260]: successful
[email protected]:~#

... or by restarting the initiator:

/etc/init.d/open-iscsi restart

(If you want to log out, you can run

iscsiadm -m node --targetname "iqn.2001-04.com.example:storage.lun1" --portal "192.168.0.101:3260" --logout

)

In the output of

fdisk -l

you should now find a new hard drive (/dev/sdb in this example); that‘s our iSCSI storage device:

[email protected]:~# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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: 0x00016be9
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          32      248832   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              32        3917    31205377    5  Extended
/dev/sda5              32        3917    31205376   8e  Linux LVM
Disk /dev/sdb: 21.5 GB, 21474836480 bytes
64 heads, 32 sectors/track, 20480 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: 0x00000000
Disk /dev/sdb doesn‘t contain a valid partition table
[email protected]:~#

To use that device, we must format it:

fdisk /dev/sdb

server1:~# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x882944df.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won‘t be recoverable.
The number of cylinders for this disk is set to 20480.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): <-- m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition‘s system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)
Command (m for help): <-- n
Command action
   e   extended
   p   primary partition (1-4)
<-- p
Partition number (1-4): <-- 1
First cylinder (1-20480, default 1): <-- ENTER
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-20480, default 20480): <-- ENTER
Using default value 20480
Command (m for help): <-- t
Selected partition 1
Hex code (type L to list codes): <-- L
0  Empty           1e  Hidden W95 FAT1 80  Old Minix       be  Solaris boot
1  FAT12           24  NEC DOS         81  Minix / old Lin bf  Solaris
2  XENIX root      39  Plan 9          82  Linux swap / So c1  DRDOS/sec (FAT-
3  XENIX usr       3c  PartitionMagic  83  Linux           c4  DRDOS/sec (FAT-
4  FAT16 <32M      40  Venix 80286     84  OS/2 hidden C:  c6  DRDOS/sec (FAT-
5  Extended        41  PPC PReP Boot   85  Linux extended  c7  Syrinx
6  FAT16           42  SFS             86  NTFS volume set da  Non-FS data
7  HPFS/NTFS       4d  QNX4.x          87  NTFS volume set db  CP/M / CTOS / .
8  AIX             4e  QNX4.x 2nd part 88  Linux plaintext de  Dell Utility
9  AIX bootable    4f  QNX4.x 3rd part 8e  Linux LVM       df  BootIt
a  OS/2 Boot Manag 50  OnTrack DM      93  Amoeba          e1  DOS access
b  W95 FAT32       51  OnTrack DM6 Aux 94  Amoeba BBT      e3  DOS R/O
c  W95 FAT32 (LBA) 52  CP/M            9f  BSD/OS          e4  SpeedStor
e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs
f  W95 Ext‘d (LBA) 54  OnTrackDM6      a5  FreeBSD         ee  EFI GPT
10  OPUS            55  EZ-Drive        a6  OpenBSD         ef  EFI (FAT-12/16/
11  Hidden FAT12    56  Golden Bow      a7  NeXTSTEP        f0  Linux/PA-RISC b
12  Compaq diagnost 5c  Priam Edisk     a8  Darwin UFS      f1  SpeedStor
14  Hidden FAT16 <3 61  SpeedStor       a9  NetBSD          f4  SpeedStor
16  Hidden FAT16    63  GNU HURD or Sys ab  Darwin boot     f2  DOS secondary
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fd  Linux raid auto
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fe  LANstep
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid ff  BBT
1c  Hidden W95 FAT3 75  PC/IX
Hex code (type L to list codes): <-- 83
Command (m for help): <-- w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
server1:~#

Afterwards, the output of

fdisk -l

should look as follows:

[email protected]:~# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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: 0x00016be9
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          32      248832   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              32        3917    31205377    5  Extended
/dev/sda5              32        3917    31205376   8e  Linux LVM
Disk /dev/sdb: 21.5 GB, 21474836480 bytes
64 heads, 32 sectors/track, 20480 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: 0x725b9dff
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       20480    20971504   83  Linux
[email protected]:~#

Now we create a filesystem on /dev/sdb1...

mkfs.ext4 /dev/sdb1

... and mount it for test purposes:

mount /dev/sdb1 /mnt

You should now see the new device in the outputs of...

mount

[email protected]:~# mount
/dev/mapper/server1-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
none on /var/lib/ureadahead/debugfs type debugfs (rw,relatime)
/dev/sda1 on /boot type ext2 (rw)
/dev/sdb1 on /mnt type ext4 (rw)
[email protected]:~#

... and

df -h

[email protected]:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/server1-root
                       18G  838M   16G   5% /
none                  243M  180K  242M   1% /dev
none                  247M     0  247M   0% /dev/shm
none                  247M   36K  247M   1% /var/run
none                  247M     0  247M   0% /var/lock
none                  247M     0  247M   0% /lib/init/rw
none                   18G  838M   16G   5% /var/lib/ureadahead/debugfs
/dev/sda1             228M   17M  199M   8% /boot
/dev/sdb1              20G  172M   19G   1% /mnt
[email protected]:~#

You can unmount it like this:

umount /mnt

To have the device mounted automatically at boot time, e.g. in the directory /storage, we create that directory...

mkdir /storage

... and add the following line to /etc/fstab:

vi /etc/fstab

[...]
/dev/sdb1       /storage        ext4    defaults,auto,_netdev 0 0

For test purposes, you can now reboot the system:

reboot

After the reboot, the device should be mounted:

mount

[email protected]:~# mount
/dev/mapper/server1-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
none on /var/lib/ureadahead/debugfs type debugfs (rw,relatime)
/dev/sda1 on /boot type ext2 (rw)
/dev/sdb1 on /storage type ext4 (rw,_netdev)
[email protected]:~#

df -h

[email protected]:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/server1-root
                       18G  839M   16G   5% /
none                  243M  180K  242M   1% /dev
none                  247M     0  247M   0% /dev/shm
none                  247M   36K  247M   1% /var/run
none                  247M     0  247M   0% /var/lock
none                  247M     0  247M   0% /lib/init/rw
none                   18G  839M   16G   5% /var/lib/ureadahead/debugfs
/dev/sda1             228M   17M  199M   8% /boot
/dev/sdb1              20G  172M   19G   1% /storage
[email protected]:~#

4. Links

Using iSCSI On Ubuntu 10.04 (Initiator And Target),布布扣,bubuko.com

时间： 2024-08-01 22:42:50

Using iSCSI On Ubuntu 10.04 (Initiator And Target)的相关文章

【转】Ubuntu 10.04 LTS 的窗口控制按钮从左上角调整到右上角

原文网址:http://www.linuxidc.com/Linux/2010-05/26111.htm 升级到Ubuntu 10.04后最大的问题,是最小最大和关闭按钮,放到了左边.这叫Ubuntu的MAC化.这给操作带来了很大的不便.大部分的theme的窗口关闭按钮都放到左边去了.每次有窗口操作,不得不左右寻找,降低了效率. 改改即可: 窗口功能按钮的位置取决于一个配置文件.我们将使用图形界面“gconf-editor”修改这个配置文件. 按下“Alt + F2”组合键,在弹出的运行应用程序

在虚拟机下安装ubuntu 10.04 64bit，并修改root用户密码

实验的环境: 笔记本是:HP 虚拟机:VMware  9 准备安装的操作系统: ubuntu 10.04  64bit 实验步骤: 一:让自己的hp支持虚拟化技术(由于ubuntu 10.04  64bit需要CPU支持虚拟化技术,所以要通过bios来更改电脑的默认设置) 启动时根据提示按 Esc 键 按 F10 键以配置 BIOS 使用箭头键滚动到"System Configuration" 选择"Virtualization Technology",然后按 En

Ubuntu 10.04下架设流媒体服务器

Ubuntu 10.04下架设流媒体服务器 个人建议:使用DarwinStreamingSrvr5.5.5,因为DarwinStreamingSrvr6.0.3安装过程中有很多问题需要解决! 目前主流的流媒体服务器有微软的windows media server.RealNetworks的Helix server和苹果公司的Darwin Streaming Server. 微软的windows media server只能在windows 2000 server和windows 2003 ser

Ubuntu 10.04——boa服务器的搭建

 声明:自从第一次发表博文不知不觉过去了好久了,非常抱歉没能把自己的东西分享出来,但是由于上家公司本月初裁员,所以致使学的新东西成了半成品,无奈又换了一家,目前已工作三周了,自己也很想写博文分享知识,但是学的东西太杂,有都是半成品,确实不知道以什么为切入点,目前这家公司最近一直在做项目,我想先一点点的写吧,虽然我的东西能在网上找到很多样本,但是我感觉有的不全,还是自己总结的东西比较靠谱,希望对大家有所帮助,如果有新问题,我会不断更新的,好了,废话不多说了...             Ubunt

ubuntu 10.04 vpn搭建

1.环境: cat /etc/issue Ubuntu 10.04.4 LTS \n \l 2.安装 apt-get install pptpd3.查看 ps  aux |grep  pptp root     18778  0.0  0.0   1980   648 ?        Ss   01:33   0:00 /usr/sbin/pptpd 4.配置/etc/pptpd.confsudo vim /etc/pptpd.conf添加下面两行(在配置文件的最后取消注释修改IP即可)loc

分布式进阶(三)Ubuntu 10.04 之JDK安装

Ubuntu 10.04 之JDK安装 1.从官网 (http://www.Oracle.com/technetwork/java/javase/downloads/jdk6u35-downloads-1836443.html)下载安装文件(如:jdk-6u45-linux-x64.bin).复制该文件到/usr/lib/java下,如果没有java文件夹,则创建它.sudo mkdir  -p  /usr/lib/jvm/java 安转文件默认是没有执行权限的,所以首先第一步是要将安装文件赋予

分布式进阶(四)Ubuntu 10.04下安装Tomcat 6

Ubuntu 10.04下安装Tomcat 6 1,下载apache-tomcat6, 地址链接:http://archive.apache.org/dist/tomcat/tomcat-6/v6.0.28/bin/ 选择Ubuntu Linux适用版本,即apache-tomcat-6.0.28.tar.gz文件, 2,复制安装文件到/usr/local/目录下面,在控制台console输入命令, sudo cp /home/shq/桌面/apache-tomcat-6.0.28.tar.gz

ubuntu 10.04 安装arm交叉编译器

家里有一台cotext-A9(armv7-a) 的盒子,现在不用了, 一直想着废物利用.于是想怎么为这盒子编译程序. 目标机器: [email protected]:/# uname -a Linux routon-h1 2.6.34 #3 SMP Mon Oct 29 19:01:06 CST 2012 armv7l GNU/Linux 装了一台 ubuntu 10.04 X86 的虚拟机 [email protected]:~# uname -a Linux ubuntu 2.6.32-38

Ubuntu 10.04 LTS 系统安装

[1] Insert a disk for installation of Ubuntu 10.04 LTS and reboot your computer. The screen of selecting language. Choose it and go next.   [2] Push Enter   [3] Select your language.   [4] select your country.   [5] Select "No" to configure manu