1.配置target
# ll /mnt/cdrom/Packages/ | grep target
-r--r--r-- 2 root root 180992 May 12 2016 scsi-target-utils-1.0.24-18.el6.x86_64.rpm
# yum install scsi-target-utils
# rpm -ql scsi-target-utils | less
/etc/rc.d/init.d/tgtd /etc/sysconfig/tgtd /etc/tgt/targets.conf （配置文件） /usr/sbin/tgt-admin /usr/sbin/tgt-setup-lun /usr/sbin/tgtadm （target的管理工具） /usr/sbin/tgtd /usr/sbin/tgtimg /usr/share/doc/scsi-target-utils-1.0.24 /usr/share/doc/scsi-target-utils-1.0.24/README /usr/share/doc/scsi-target-utils-1.0.24/README.iscsi /usr/share/doc/scsi-target-utils-1.0.24/README.iser /usr/share/doc/scsi-target-utils-1.0.24/README.lu_configuration /usr/share/doc/scsi-target-utils-1.0.24/README.mmc /usr/share/man/man5/targets.conf.5.gz /usr/share/man/man8/tgt-admin.8.gz /usr/share/man/man8/tgt-setup-lun.8.gz /usr/share/man/man8/tgtadm.8.gz
# man tgtadm
initator访问target需要认证：
1.地址
2.chap
tgtadm的使用：
--lld <driver> --op new --mode target --tid <id> --targetname <name> （声明target）
Add a new target with <id> and <name>.
--lld <driver> --op show --mode target （查看target）
Show all the targets.
--lld <driver> --op new --mode logicalunit --tid <id> --lun <lun> --backing-store <path> （声明逻辑单元lun）
Add a new logical unit with <lun> to specific target with <id>. The logical unit is offered to the
initiators. <path> must be block device files (including LVM and RAID devices) or regular files.
lun0 is reserved for a special device automatically created.
--lld <driver> --op bind --mode target --tid <id> --initiator-address <address> （访问控制）
Add the address to the access lists of the target with <id>. Initiators with the address can access
to the target. ‘ALL‘ is a special address to allow all initiators to access to a target.
iqn格式的名称：iqn.日期(年-月).域名(反写).string:substring
# service tgtd start
# tgtadm --lld iscsi --op new --mode target --tid 1 --targetname iqn.2019-10.cn.itecs.target:disk （声明target）
# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2019-10.cn.itecs.target:disk 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:
把原有硬盘的一个分区作为一个逻辑单元lun
# fdisk -l
Disk /dev/sda: 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: 0x00025156 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 1301 10240000 83 Linux /dev/sda3 1301 1366 524288 82 Linux swap / Solaris
# fdisk /dev/sda
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 Selected partition 4 First cylinder (1366-2610, default 1366): <回车> Using default value 1366 Last cylinder, +cylinders or +size{K,M,G} (1366-2610, default 2610): +5G Command (m for help): p Disk /dev/sda: 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: 0x00025156 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 1301 10240000 83 Linux /dev/sda3 1301 1366 524288 82 Linux swap / Solaris /dev/sda4 1366 2019 5247505+ 83 Linux Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks.
在Linux中，某些命令名称和rpm包的名称是不一样的，可以通过以下命令查看某些命令属于哪个rpm包
# yum provides */partprobe （查找命令partprobe属于哪个包）
parted-2.1-29.el6.i686 : The GNU disk partition manipulation program Repo : base Matched from: Filename : /sbin/partprobe parted-2.1-29.el6.x86_64 : The GNU disk partition manipulation program Repo : base Matched from: Filename : /sbin/partprobe
# yum install parted
# partprobe /dev/sda
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 --backing-store /dev/sda4 （声明逻辑单元lun）
# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2019-10.cn.itecs.target:disk 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: 5373 MB, Block size: 512 Online: Yes Removable media: No Prevent removal: No Readonly: No Backing store type: rdwr Backing store path: /dev/sda4 Backing store flags: Account information: ACL information:
# tgtadm --lld iscsi --op bind --mode target --tid 1 --initiator-address 192.168.80.0/24（添加访问控制）
# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2019-10.cn.itecs.target:disk 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: 5373 MB, Block size: 512 Online: Yes Removable media: No Prevent removal: No Readonly: No Backing store type: rdwr Backing store path: /dev/sda4 Backing store flags: Account information: ACL information: 192.168.80.0/24
要把上面的配置信息写到一个文件中，否则机器重启这些配置信息就没有了。
# vim /etc/tgt/targets.conf
<target iqn.2019-10.cn.itecs.target:disk> backing-store /dev/sda4 initiator-address 192.168.80.0/24 </target>
至此，target配置完成。
2.在另一台服务器上配置initiator1
# ll /mnt/cdrom/Packages/*initiator*
-r--r--r-- 2 root root 748696 Mar 23 2017 /mnt/cdrom/Packages/iscsi-initiator-utils-6.2.0.873-26.el6.x86_64.rpm
# rpm -qa | grep iscsi-initiator-utils
# yum install iscsi-initiator-utils
# rpm -ql iscsi-initiator-utils
/etc/NetworkManager /etc/NetworkManager/dispatcher.d /etc/NetworkManager/dispatcher.d/04-iscsi /etc/iscsi /etc/iscsi/iscsid.conf /etc/logrotate.d/iscsiuiolog /etc/rc.d/init.d/iscsi /etc/rc.d/init.d/iscsid /sbin/brcm_iscsiuio /sbin/iscsi-iname /sbin/iscsiadm （管理工具） /sbin/iscsid /sbin/iscsistart /sbin/iscsiuio /usr/lib64/libiscsi.so.0 /usr/lib64/python2.6/site-packages/libiscsimodule.so /usr/share/doc/iscsi-initiator-utils-6.2.0.873 /usr/share/doc/iscsi-initiator-utils-6.2.0.873/README /usr/share/man/man8/iscsi-iname.8.gz /usr/share/man/man8/iscsiadm.8.gz /usr/share/man/man8/iscsid.8.gz /usr/share/man/man8/iscsistart.8.gz /usr/share/man/man8/iscsiuio.8.gz /var/lib/iscsi /var/lib/iscsi/ifaces /var/lib/iscsi/isns /var/lib/iscsi/nodes /var/lib/iscsi/send_targets /var/lib/iscsi/slp /var/lib/iscsi/static /var/lock/iscsi
# man iscsiadm
iscsiadm --mode discoverydb --type sendtargets --portal 192.168.80.134 --discover 或 iscsiadm --mode discovery --type sendtargets --portal 192.168.80.134
iscsiadm --mode node --targetname iqn.2019-10.cn.itecs.target:disk --portal 192.168.80.134:3260 --login
iscsiadm --mode node --targetname iqn.2019-10.cn.itecs.target:disk --portal 192.168.80.134:3260 --logout
# iscsiadm --mode discovery --type sendtargets --portal 192.168.80.134 或 iscsiadm -m discovery -t sendtargets -p 192.168.80.134
Starting iscsid: [ OK ] 192.168.80.134:3260,1 iqn.2019-10.cn.itecs.target:disk
默认端口3260。discovery之前会自动启动iscsid服务，有时候service iscsid start启动没反应，可以通过这种方式启动服务。
# vim /etc/iscsi/initiatorname.iscsi（给initiator指定一个名字）
InitiatorName=iqn.2019-10.cn.itecs.server1:initiator
# service iscsi restart
iscsi服务启动成功后，initiator就自动登录进了target，也可以手动登录进去。
# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes 255 heads, 63 sectors/track, 5221 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: 0x000e7987 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 2576 20480000 83 Linux /dev/sda3 2576 2641 524288 82 Linux swap / Solaris Disk /dev/sdb: 5373 MB, 5373445632 bytes 166 heads, 62 sectors/track, 1019 cylinders Units = cylinders of 10292 * 512 = 5269504 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
发现多出了一块硬盘。此时在target上查看：
[[email protected] ~]# tgtadm --lld iscsi --op show --mode target Target 1: iqn.2019-10.cn.itecs.target:disk System information: Driver: iscsi State: ready I_T nexus information: I_T nexus: 1 Initiator: iqn.2019-10.cn.itecs.server1:initiator Connection: 0 IP Address: 192.168.80.100 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: 5373 MB, Block size: 512 Online: Yes Removable media: No Prevent removal: No Readonly: No Backing store type: rdwr Backing store path: /dev/sda4 Backing store flags: Account information: ACL information: 192.168.80.0/24
接下来进行分区和格式化：
[[email protected] ~]# 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 0x395d904f. 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 (1-1019, default 1): <回车> Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-1019, default 1019): <回车> Using default value 1019 Command (m for help): p Disk /dev/sdb: 5373 MB, 5373445632 bytes 166 heads, 62 sectors/track, 1019 cylinders Units = cylinders of 10292 * 512 = 5269504 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x395d904f Device Boot Start End Blocks Id System /dev/sdb1 1 1019 5243743 83 Linux Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.
# mkfs -t ext4 /dev/sdb1
# mkdir /mnt/1
# mount /dev/sdb1 /mnt/1
# cd /mnt/1
# touch f{1,2}
至此，第一个initiator配置完成。依葫芦画瓢，配置第二个initiator。