02Linux系统上IP SAN的实现

配置环境

node1：192.168.1.151CentOS6.5

node2：192.168.1.152CentOS6.5

node3：192.168.1.153CentOS6.5#服务端：node3添加两块20G磁盘

配置iSCSI target（服务端）

1、准备硬盘

在node3上添加两块20磁盘

2、安装程序包，启动服务

[root@node3 ~]# yum -y install scsi-target-utils

[root@node3 ~]# service tgtd start

[root@node3 ~]# chkconfig tgtd on

3、创建target

方法1：命令行

创建iscsi target

[root@node3 ~]# tgtadm --lld iscsi --mode target --op new --tid 1 --targetname iqn.2015-06.com.magedu:s1.t1

查看当前主机上的iscsi target

[root@node3 ~]# tgtadm --lld iscsi --mode target --op show

Target 1: iqn.2015-06.com.magedu:s1.t1

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:

方法2：配置文件方式

[root@node3 ~]# cd /etc/tgt/

[root@node3 tgt]# cp targets.conf{,.bak}

[root@node3 tgt]# vim targets.conf

添加

<target iqn.2015-06.com.magedu:s2.t1>

backing-store /dev/sdb

backing-store /dev/sdc

initiator-address 192.168.1.0/24

</target>

[root@node3 tgt]# service tgtd restart

[root@node3 tgt]# tgtadm -L iscsi -m target -o show

Target 1: iqn.2015-06.com.magedu:s2.t1

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: 21475 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: 

LUN: 2

Type: disk

SCSI ID: IET     00010002

SCSI SN: beaf12

Size: 21475 MB, Block size: 512

Online: Yes

Removable media: No

Prevent removal: No

Readonly: No

Backing store type: rdwr

Backing store path: /dev/sdc

Backing store flags: 

Account information:

ACL information:

192.168.1.0/24

4、创建lun

[root@node3 ~]# tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 --backing-store /dev/sdb

[root@node3 ~]# tgtadm --lld iscsi --mode target --op show

Target 1: iqn.2015-06.com.magedu:s1.t1

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: 21475 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:

[root@node3 ~]# tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 2 --backing-store /dev/sdc

[root@node3 ~]# tgtadm --lld iscsi --mode target --op show

Target 1: iqn.2015-06.com.magedu:s1.t1

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: 21475 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: 

LUN: 2

Type: disk

SCSI ID: IET     00010002

SCSI SN: beaf12

Size: 21475 MB, Block size: 512

Online: Yes

Removable media: No

Prevent removal: No

Readonly: No

Backing store type: rdwr

Backing store path: /dev/sdc

Backing store flags: 

Account information:

ACL information:

删除lun

[root@node3 ~]# tgtadm --lld iscsi --mode logicalunit --op delete --tid 1 --lun 2

[root@node3 ~]# tgtadm --lld iscsi --mode target --op show                       

Target 1: iqn.2015-06.com.magedu:s1.t1

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: 21475 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:

[root@node3 ~]# tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 2 --backing-store /dev/sdc

5、授权

（1）通常IP地址认证

[root@node3 ~]# tgtadm --lld iscsi --mode target --op bind --tid 1 --initiator-address 192.168.1.0/24

（2）通过账号认证

#创建用户账号

[root@node3 ~]# tgtadm -L iscsi -m account -o new --user obama --password obama

#绑定用户账号

[root@node3 ~]# tgtadm -L iscsi -m account -o bind --tid 1 --user obama

#解绑用户账号

[root@node3 ~]# tgtadm -L iscsi -m account -o unbind --tid 1 --user obama

#查看用户账号

[root@node3 ~]# tgtadm -L iscsi -m account -o show

[root@node1 ~]# vim /etc/iscsi/iscsid.conf 

去掉

60 #node.session.auth.username = username

61 #node.session.auth.password = password

74 #discovery.sendtargets.auth.username = username

75 #discovery.sendtargets.auth.password = password

行首的#号

配置iSCSI initiator（客户端）

1、安装程序包，配置initiator的名字，并启动服务

[root@node1 ~]# yum -y install iscsi-initiator-utils

[root@node1 ~]# service iscsi start

[root@node1 ~]# service iscsid start

[root@node1 ~]# echo "InitiatorName=$(iscsi-iname -p iqn.2015-06.com.magedu)" > /etc/iscsi/initiatorname.iscsi

[root@node1 ~]# for i in iscsi iscsid;do service $i restart;done

2、使用iscsiadm实现target的发现，注册等

（1）发现模式：discovery

[root@node1 ~]# iscsiadm -m discovery -d 3 -t st -p 192.168.1.153:3260

iscsiadm: ip 192.168.1.153, port 3260, tgpt -1

iscsiadm: Max file limits 1024 4096

Starting iscsid:                                           [  OK  ]

iscsiadm: Could not open /var/lib/iscsi/send_targets/192.168.1.153,3260: No such file or directory

iscsiadm: starting sendtargets discovery, address 192.168.1.153:3260, 

iscsiadm: connecting to 192.168.1.153:3260

iscsiadm: connected local port 58181 to 192.168.1.153:3260

iscsiadm: connected to discovery address 192.168.1.153

iscsiadm: login response status 0000

iscsiadm: discovery process to 192.168.1.153:3260 exiting

iscsiadm: disconnecting conn 0xd87ce8, fd 3

192.168.1.153:3260,1 iqn.2015-06.com.magedu:s1.t1

[root@node1 ~]# ls /var/lib/iscsi/send_targets/

192.168.1.153,3260

[root@node1 ~]# ls /var/lib/iscsi/send_targets/192.168.1.153,3260/

iqn.2015-06.com.magedu:s1.t1,192.168.1.153,3260,1,default  st_config

（2）节点模式：node#登录

登录target

[root@node1 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -l

Logging in to [iface: default, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260] (multiple)

Login to [iface: default, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260] successful.

登出target

[root@node1 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -u

Logging out of session [sid: 1, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260]

Logout of [sid: 1, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260] successful.

删除target

[root@node1 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -o delete#需要先登出target

[root@node1 ~]# ls /var/lib/iscsi/send_targets/192.168.1.153,3260/

st_config

[root@node1 ~]# iscsiadm -m discovery -d 3 -t st -p 192.168.1.153:3260  

[root@node1 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -l

[root@node1 ~]# fdisk -l /dev/sd[a-z]

Disk /dev/sda: 214.7 GB, 214748364800 bytes

255 heads, 63 sectors/track, 26108 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: 0x000284a7

  Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          26      204800   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2              26        5248    41943040   83  Linux

/dev/sda3            5248        5509     2097152   82  Linux swap / Solaris

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/sdc: 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

[root@node1 ~]# 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 0x27fc8101.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won‘t be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It‘s strongly recommended to

switch off the mode (command ‘c‘) and change display units to

sectors (command ‘u‘).

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): 

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-20480, default 20480): +5G

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@node1 ~]# mke2fs -t ext4 /dev/sdb1

[root@node1 ~]# mount /dev/sdb1 /mnt

[root@node1 ~]# cd /mnt/

[root@node3 ~]# fdisk -l /dev/sd[a-z]

Disk /dev/sda: 214.7 GB, 214748364800 bytes

255 heads, 63 sectors/track, 26108 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: 0x000284a7

  Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          26      204800   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2              26        5248    41943040   83  Linux

/dev/sda3            5248        5509     2097152   82  Linux swap / Solaris

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: 0x27fc8101

  Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1        5121     5243888   83  Linux

Disk /dev/sdc: 21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 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

[root@node1 mnt]# cp /etc/issue /mnt/

[root@node1 mnt]# vim /mnt/issue

new line

node2安装配置iSCSI initiator

[root@node2 ~]# yum -y install iscsi-initiator-utils

[root@node2 ~]# echo "InitiatorName=$(iscsi-iname -p iqn.2015-06.com.magedu.com)" > /etc/iscsi/initiatorname.iscsi

[root@node2 ~]# service iscsi start

[root@node2 ~]# service iscsid start

[root@node2 ~]# iscsiadm -m discovery -t st -p 192.168.1.153:3260

Starting iscsid:                                           [  OK  ]

192.168.1.153:3260,1 iqn.2015-06.com.magedu:s1.t1

[root@node2 ~]# iscsiadm -m node -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -l

[root@node2 ~]# fdisk -l /dev/sd[a-z]

Disk /dev/sda: 214.7 GB, 214748364800 bytes

255 heads, 63 sectors/track, 26108 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: 0x000284a7

  Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          26      204800   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2              26        5248    41943040   83  Linux

/dev/sda3            5248        5509     2097152   82  Linux swap / Solaris

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: 0x27fc8101

  Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1        5121     5243888   83  Linux

Disk /dev/sdc: 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

[root@node2 ~]# mount /dev/sdb1 /mnt/

[root@node2 ~]# ls /mnt/

issue  lost+found

issue  lost+found

[root@node2 ~]# cat /mnt/issue 

CentOS release 6.5 (Final)

Kernel \r on an \m

new line

#和node1上添加后的内容一致

[root@node2 ~]# vim /mnt/issue

删除node1添加的new line行

[root@node1 mnt]# cat /mnt/issue 

CentOS release 6.5 (Final)

Kernel \r on an \m

new line

#node1上issue显示的还是原来的结果

[root@node1 ~]# umount /mnt

[root@node2 ~]# umount /mnt

解除绑定

1、客户端

#登出

[root@node1 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -uLogging out of session [sid: 3, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260]

Logout of [sid: 3, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260] successful.

#删除

[root@node1 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -o delete

[root@node2 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -u

Logging out of session [sid: 1, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260]

Logout of [sid: 1, target: iqn.2015-06.com.magedu:s1.t1, portal: 192.168.1.153,3260] successful.

[root@node2 ~]# iscsiadm -m node -d 1 -T iqn.2015-06.com.magedu:s1.t1 -p 192.168.1.153:3260 -o delete

2、服务端

#删除lun

[root@node3 ~]# tgtadm -L iscsi -m logicalunit -o delete -t 1 -l 2

[root@node3 ~]# tgtadm -L iscsi -m logicalunit -o delete -t 1 -l 1

删除target

[root@node3 ~]# tgtadm -L iscsi -m target -o delete -t 1

[root@node3 ~]# tgtadm -L iscsi -m target -o show

[root@node1 ~]# iscsiadm -m discovery -t st -p 192.168.1.153:3260

[root@node1 ~]# iscsiadm -m node -T iqn.2015-06.com.magedu:s2.t1 -p 192.168.1.153:3260 -l

[root@node1 ~]# fdisk -l /dev/sd[a-z]

本文出自 “追梦” 博客，请务必保留此出处http://sihua.blog.51cto.com/377227/1861938

34补3-2 Linux系统上IP SAN的实现