CentOS6.5 iscsi配置

CentOS 2020-06-09

iSCSI分为提供存储设备的服务端和使用存储的客户端

  • iSCSI target：存储设备服务端，存放磁盘或RAID的设备。目的在于提供给其他主机使用

  • iSCSI initiator：使用target存储服务的客户端

SAN和NAS

  • SAN（存储局域网）：来自局域网内的其他存储设备提供的磁盘，可以进行格式化操作（如iSCSI）

  • NAS（网络文件系统）：来自NAS提供的文件系统，只能立即使用，不能进行格式化（如NFS）


一、存储服务端上安装配置iSCSI target

1、在存储服务器上安装scsi-target-utils软件（rhel7为targetcli）

[root@node1~]#yuminstallscsi-target-utils

2、启动iscsi服务

[root@node1~]#/etc/init.d/tgtdstart
[root@node1~]#chkconfigtgtdon
#监听端口为3260
[root@node1~]#netstat-tuanlp|greptgtd
tcp000.0.0.0:32600.0.0.0:*LISTEN1248/tgtd
tcp00:::3260:::*LISTEN1248/tgtd

3、scsi-target-utils的相关配置文件

#/etc/tgt/targets.conf主配置文件，设置要共享的磁盘格式与块设备等
#/usr/sbin/tgt-admin查询、删除target等功能的设置工具
#/usr/sbin/tgt-setup-lun建立target以及设置共享的磁盘与可使用的客户端等的程序
#/usr/sbin/tgtadmiscsitarget管理程序（可使用配置文件取代）
#/usr/sbin/tgtd提供iSCSItarget服务的主程序
#/usr/sbin/tgtimg搭建共享镜像文件设备程序

4、建立分区配置iSCSI存储设备

==================================================================
#创建一个容量为1G的普通分区

[root@node1~]#fdisk/dev/sdb
Command(mforhelp):n
Commandaction
eextended
pprimarypartition(1-4)
p
Partitionnumber(1-4):1
Firstcylinder(1-652,default1):
Usingdefaultvalue1
Lastcylinder,+cylindersor+size{K,M,G}(1-652,default652):+1G
Command(mforhelp):p

Disk/dev/sdb:5368MB,5368709120bytes
255heads,63sectors/track,652cylinders
Units=cylindersof16065*512=8225280bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x85d4a809

DeviceBootStartEndBlocksIdSystem
/dev/sdb111321060258+83Linux
Command(mforhelp):w
Thepartitiontablehasbeenaltered!

Callingioctl()tore-readpartitiontable.
Syncingdisks.


[root@node1~]#ll/dev/sdb*
brw-rw----1rootdisk8,16Sep100:23/dev/sdb
brw-rw----1rootdisk8,17Sep100:23/dev/sdb1

==================================================================
#创建一个容量为1GLVM分区
Command(mforhelp):n
Commandaction
eextended
pprimarypartition(1-4)
p
Partitionnumber(1-4):2
Firstcylinder(133-652,default133):
Usingdefaultvalue133
Lastcylinder,G}(133-652,default652):+1G

Command(mforhelp):t
Partitionnumber(1-4):2
Hexcode(typeLtolistcodes):8e
Changedsystemtypeofpartition2to8e(LinuxLVM)

Command(mforhelp):p

Disk/dev/sdb:5368MB,652cylinders
Units=cylindersof16065*512=8225280bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x85d4a809

DeviceBootStartEndBlocksIdSystem
/dev/sdb111321060258+83Linux
/dev/sdb213326410602908eLinuxLVM

[root@node1~]#ll/dev/sdb
sdbsdb1sdb2
[root@node1~]#ll/dev/sdb*
brw-rw----1rootdisk8,16Sep100:27/dev/sdb
brw-rw----1rootdisk8,17Sep100:27/dev/sdb1
brw-rw----1rootdisk8,18Sep100:27/dev/sdb2

[root@node1~]#pvcreate/dev/sdb2
Physicalvolume"/dev/sdb2"successfullycreated
[root@node1~]#vgcreate-s8MVolGroup00/dev/sdb2
Volumegroup"VolGroup00"successfullycreated
[root@node1~]#lvcreate-L800M-niscsi00VolGroup00
Logicalvolume"iscsi00"created

[root@node1~]#lvscan
ACTIVE'/dev/VolGroup00/iscsi00'[800.00MiB]inherit
ACTIVE'/dev/VolGroup/lv_root'[8.57GiB]inherit
ACTIVE'/dev/VolGroup/lv_swap'[960.00MiB]inherit
[root@node1~]#lvdisplay
---Logicalvolume---
LVPath/dev/VolGroup00/iscsi00
LVNameiscsi00
VGNameVolGroup00
LVUUID2G9zLo-kWmj-ydMH-luer-wM0i-4bdl-UJwJov
LVWriteAccessread/write
LVCreationhost,timenode1,2016-09-0100:31:14+0800
LVStatusavailable
#open0
LVSize800.00MiB
CurrentLE100
Segments1
Allocationinherit
Readaheadsectorsauto
-currentlysetto256
Blockdevice253:2


5、共享iSCSI target文件名

iqn.YYYY-mm.<域名的反转写法>：共享名
如：iqn.2015-06.org.haungming:viscsidisk


6、配置/etc/tgt/targets.conf，设置共享存储设备的路径相关属性

#SampletargetwithoneLUNonly.Defaultstoallowaccessforallinitiators:

#<targetiqn.2008-09.com.example:server.target1>
#backing-store/dev/LVM/somedevice
#</target>

<targetiqn.2016-09.org.huangming:viscsidisk>
backing-store/dev/sdb1
backing-store/dev/VolGroup00/iscsi00
initiator-address10.0.0.12
initiator-address10.0.0.0/24
incominguserviscsiuserviscsipasswd
write-cacheoff
</target>

#backing-store：虚拟的设备
#initiator-address：允许使用的客户端
#incominguser：配置通过用户和密码访问
#write-cache：不使用缓存，直接访问存储设备


7、重启tgtd服务

[root@node1~]#/etc/init.d/tgtdrestart
StoppingSCSItargetdaemon:[OK]
StartingSCSItargetdaemon:[OK]


8、查看iscsi target共享存储的相关信息，使用tgt-admin --show命令

[root@node1~]#tgt-admin--show
Target1:iqn.2016-09.org.huangming:viscsidisk
Systeminformation:
Driver:iscsi
State:ready
I_Tnexusinformation:
LUNinformation:
LUN:0
Type:controller
SCSIID:IET00010000
SCSISN:beaf10
Size:0MB,Blocksize:1
Online:Yes
Removablemedia:No
Preventremoval:No
Readonly:No
Backingstoretype:null
Backingstorepath:None
Backingstoreflags:
LUN:1
Type:disk
SCSIID:IET00010001
SCSISN:beaf11
Size:839MB,Blocksize:512
Online:Yes
Removablemedia:No
Preventremoval:No
Readonly:No
Backingstoretype:rdwr
Backingstorepath:/dev/VolGroup00/iscsi00
Backingstoreflags:
LUN:2
Type:disk
SCSIID:IET00010002
SCSISN:beaf12
Size:1086MB,Blocksize:512
Online:Yes
Removablemedia:No
Preventremoval:No
Readonly:No
Backingstoretype:rdwr
Backingstorepath:/dev/sdb1
Backingstoreflags:
Accountinformation:
viscsiuser
ACLinformation:
10.0.0.12/24

9、防火墙设置

[root@node1~]#iptables-AINPUT-ptcp-s10.0.0.12/24--dport3260-jACCEPT


二、客户端iSCSI initiator的配置

1、安装iscsi-initiator-utils

[root@node1~]#yuminstalliscsi-initiator-utils

2、iscsi-initiator-utils的主要配置文件

#/etc/iscsi/iscsi.conf主要配置文件，用来连接到iscsitarget的设置
#/sbin/iscsid启动iSCSIinitiator的主要服务程序
#/sbin/iscsiadm用来管理iSCSIinitiator的主要设置程序
#/etc/init.d/iscsid让本机模拟成为iSCSIinitiator的主要服务
#/etc/init.d/iscsiiscsi启动脚本


3、配置iscsi initiator，修改/etc/iscsi/iscsid.conf文件

#去掉注释，并设置iscsitarget提供的验证用户和密码
node.session.auth.username=viscsiuser
node.session.auth.password=viscsipasswd

discovery.sendtargets.auth.username=viscsiuser
discovery.sendtargets.auth.password=viscsipasswd


4、检测iscsi target服务端提供的共享存储设备信息

[root@node2~]#iscsiadm-mdiscovery-tsendtargets-p10.0.0.11:3260
10.0.0.11:3260,1iqn.2016-09.org.huangming:viscsidisk

#查看检查结果
[root@node2~]#ll-R/var/lib/iscsi/nodes/
/var/lib/iscsi/nodes/:
total4
drw-------.3rootroot4096Sep317:46iqn.2016-09.org.huangming:viscsidisk

/var/lib/iscsi/nodes/iqn.2016-09.org.huangming:viscsidisk:
total4
drw-------.2rootroot4096Sep317:4610.0.0.11,3260,1

/var/lib/iscsi/nodes/iqn.2016-09.org.huangming:viscsidisk/10.0.0.11,1:
total4
-rw-------.1rootroot2126Sep317:46default


#启动iscsi服务
[root@node2~]#/etc/init.d/iscsirestart
Stoppingiscsi:[OK]
Startingiscsi:[OK]

#设置iscsi和iscsid开机启动
[root@node2~]#chkconfigiscsion
[root@node2~]#chkconfigiscsidon


5、登陆iscsi target

#显示target数据
[root@node2~]#iscsiadm-mnode
10.0.0.11:3260,1iqn.2016-09.org.huangming:viscsidisk
#登陆target
[root@node2~]#iscsiadm-mnode-Tiqn.2016-09.org.huangming:viscsidisk--login

#查看获得的iscsi磁盘信息
[root@node2~]#fdisk-l

Disk/dev/sda:10.7GB,10737418240bytes
255heads,1305cylinders
Units=cylindersof16065*512=8225280bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x000ba502

DeviceBootStartEndBlocksIdSystem
/dev/sda1*16451200083Linux
Partition1doesnotendoncylinderboundary.
/dev/sda264130699727368eLinuxLVM

Disk/dev/mapper/VolGroup-lv_root:9202MB,9202302976bytes
255heads,1118cylinders
Units=cylindersof16065*512=8225280bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x00000000


Disk/dev/mapper/VolGroup-lv_swap:1006MB,1006632960bytes
255heads,122cylinders
Units=cylindersof16065*512=8225280bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x00000000


Disk/dev/sdb:838MB,838860800bytes
26heads,62sectors/track,1016cylinders
Units=cylindersof1612*512=825344bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x00000000


Disk/dev/sdc:1085MB,1085704704bytes
34heads,61sectors/track,1022cylinders
Units=cylindersof2074*512=1061888bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x00000000


6、建立分区

[root@node2~]#fdisk/dev/sdc
[root@node2~]#mkfs.ext4/dev/sdc1
[root@node2~]#mkdir/viscsidisk
[root@node2~]#mount/dev/sdc1/viscsidisk/
[root@node2~]#df-Th
FilesystemTypeSizeUsedAvailUse%Mountedon
/dev/mapper/VolGroup-lv_rootext48.4G972M7.0G13%/
tmpfstmpfs491M0491M0%/dev/shm
/dev/sda1ext4477M51M401M12%/boot
/dev/sdc1ext4987M1.3M934M1%/viscsidisk


7、更新、删除、添加target数据的方法

#--logout注销target，但是并没有删除/var/lib/iscsi/nodes内的数据
#-odelete删除后面接的那台target连接信息/var/lib/iscsi/nodes/*
#-oupdate更新相关信息
#-onew增加一个新的target信息

[root@node2~]#iscsiadm-mnode
10.0.0.11:3260,1iqn.2016-09.org.huangming:viscsidisk
[root@node2~]#iscsiadm-mnode-Tiqn.2016-09.org.huangming:viscsidisk--logout
Loggingoutofsession[sid:4,target:iqn.2016-09.org.huangming:viscsidisk,portal:10.0.0.11,3260]
Logoutof[sid:4,3260]successful.

[root@node2~]#ls/viscsidisk/
ls:readingdirectory/viscsidisk/:Input/outputerror

#delete删除连接
[root@node2~]#iscsiadm-mnode-odelete-Tiqn.2016-09.org.huangming:viscsidisk
[root@node2~]#iscsiadm-mnode
iscsiadm:Norecordsfound

[root@node2~]#fdisk-l

Disk/dev/sda:10.7GB,122cylinders
Units=cylindersof16065*512=8225280bytes
Sectorsize(logical/physical):512bytes/512bytes
I/Osize(minimum/optimal):512bytes/512bytes
Diskidentifier:0x00000000


8、重新检测并添加target数据

[root@node2~]#iscsiadm-mdiscovery-tsendtargets-p10.0.0.11
10.0.0.11:3260,1iqn.2016-09.org.huangming:viscsidisk
[root@node2~]#iscsiadm-mnode
10.0.0.11:3260,1iqn.2016-09.org.huangming:viscsidisk

[root@node2~]#ll/var/lib/iscsi/nodes/
total4
drw-------.3rootroot4096Sep318:24iqn.2016-09.org.huangming:viscsidisk

#重新连接
[root@node2~]#iscsiadm-mnode-Tiqn.2016-09.org.huangming:viscsidisk--login
Logginginto[iface:default,3260](multiple)
Loginto[iface:default,3260]successful.
#删除target连接之后，再重新连接，磁盘中的数据不会丢失

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