iSCSI 服务配置

一、iscsi 服务端配置

  安装服务组件： yum -y install targetd targetcli
  设置服务组件启动及开机自启：

systemctl start targetd  
systemctl enable targetd  

  在图形化交互界面创建需要分享的硬盘或者分区：

# 如下所示：将 /dev/sdb 以 iscsi1 的名称共享：
[user@nnn ~]# targetcli
Warning: Could not load preferences file /root/.targetcli/prefs.bin.
targetcli shell version 2.1.fb34
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.
/> ls
o- / ................................................................................................. [...]
o- backstores ........................................................................................ [...]
| o- block ............................................................................ [Storage Objects: 0]
| o- fileio ........................................................................... [Storage Objects: 0]
| o- pscsi ............................................................................ [Storage Objects: 0]
| o- ramdisk .......................................................................... [Storage Objects: 0]
o- iscsi ...................................................................................... [Targets: 0]
o- loopback ................................................................................... [Targets: 0
/> cd /backstores/block
/backstores/block> create iscsi1 /dev/sdb
Created block storage object iscsi1 using /dev/sdb.
/backstores/block>ls
/> ls
o- / ................................................................................................. [...]
  o- backstores ...................................................................................... [...]
  | o- block .......................................................................... [Storage Objects: 4]
  | | o- scsi1 ................................................... [/dev/sdb (30.0GiB) write-thru activated]
  | | | o- alua ........................................................................... [ALUA Groups: 1]
  | | |   o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | | o- scsi2 ................................................... [/dev/sdc (30.0GiB) write-thru activated]
  | | | o- alua ........................................................................... [ALUA Groups: 1]
  | | |   o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | | o- scsi3 ................................................... [/dev/sdd (20.0GiB) write-thru activated]
  | | | o- alua ........................................................................... [ALUA Groups: 1]
  | | |   o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | | o- scsi4 ................................................... [/dev/sde (20.0GiB) write-thru activated]
  | |   o- alua ........................................................................... [ALUA Groups: 1]
  | |     o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | o- fileio ......................................................................... [Storage Objects: 0]
  | o- pscsi .......................................................................... [Storage Objects: 0]
  | o- ramdisk ........................................................................ [Storage Objects: 0]
  o- iscsi .................................................................................... [Targets: 0]
  o- loopback ................................................................................. [Targets: 0]

  创建iSCSI target名称，进入到 /iscsi 目录下，执行 create 命令，会自动创建 iqn 开头的 iscsi 共享项目：

/> cd /iscsi 
/iscsi> create
Created target iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e
Created TPG 1.

  其次，分别在该项目的 tgp1 目录下的 acl、luns 和 portals 目录下创建客户端连接名、共享的luns和共享地址及端口：

 创建共享IP和端口有可能不成功，ls 看一下，有可能已经存在相应的端口和地址了，delete 删除即可

创建 luns：
/iscsi> cd iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e/
/iscsi/iqn.20....d497c356ad80> cd tpg1/luns
/iscsi/iqn.20...d80/tpg1/luns> create /backstores/block/iscsi1 
Created LUN 0.
/iscsi/iqn.20...d80/tpg1/luns> create /backstores/block/iscsi2 
Created LUN 1.
/iscsi/iqn.20...d80/tpg1/luns> create /backstores/block/iscsi3 
Created LUN 2.
/iscsi/iqn.20...d80/tpg1/luns> create /backstores/block/iscsi4 
Created LUN 3.
创建客户端连接名：
/iscsi/iqn.20...d80/tpg1/luns> cd ..
/iscsi/iqn.20...d80/tpg1> cd acl
/iscsi/iqn.20...d80/tpg1/acl> create iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e
Created Node ACL for iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e
创建连接IP及端口：
/iscsi/iqn.20...d80/tpg1/acls> cd ..
/iscsi/iqn.20...c356ad80/tpg1> cd portals 
/iscsi/iqn.20.../tpg1/portals> create 192.168.0.109
Using default IP port 3260
Created network portal 192.168.10.10:3260.

  查看一下配置结果：

/iscsi/iqn.20...0b039f3e/tpg1> cd /
/> ls
o- / ................................................................................................. [...]
  o- backstores ...................................................................................... [...]
  | o- block .......................................................................... [Storage Objects: 4]
  | | o- scsi1 ................................................... [/dev/sdb (30.0GiB) write-thru activated]
  | | | o- alua ........................................................................... [ALUA Groups: 1]
  | | |   o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | | o- scsi2 ................................................... [/dev/sdc (30.0GiB) write-thru activated]
  | | | o- alua ........................................................................... [ALUA Groups: 1]
  | | |   o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | | o- scsi3 ................................................... [/dev/sdd (20.0GiB) write-thru activated]
  | | | o- alua ........................................................................... [ALUA Groups: 1]
  | | |   o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | | o- scsi4 ................................................... [/dev/sde (20.0GiB) write-thru activated]
  | |   o- alua ........................................................................... [ALUA Groups: 1]
  | |     o- default_tg_pt_gp ............................................... [ALUA state: Active/optimized]
  | o- fileio ......................................................................... [Storage Objects: 0]
  | o- pscsi .......................................................................... [Storage Objects: 0]
  | o- ramdisk ........................................................................ [Storage Objects: 0]
  o- iscsi .................................................................................... [Targets: 1]
  | o- iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e .................................... [TPGs: 1]
  |   o- tpg1 ....................................................................... [no-gen-acls, no-auth]
  |     o- acls .................................................................................. [ACLs: 1]
  |     | o- iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e ....................... [Mapped LUNs: 4]
  |     |   o- mapped_lun0 ......................................................... [lun0 block/scsi1 (rw)]
  |     |   o- mapped_lun1 ......................................................... [lun1 block/scsi2 (rw)]
  |     |   o- mapped_lun2 ......................................................... [lun2 block/scsi3 (rw)]
  |     |   o- mapped_lun3 ......................................................... [lun3 block/scsi4 (rw)]
  |     o- luns .................................................................................. [LUNs: 4]
  |     | o- lun0 .............................................. [block/scsi1 (/dev/sdb) (default_tg_pt_gp)]
  |     | o- lun1 .............................................. [block/scsi2 (/dev/sdc) (default_tg_pt_gp)]
  |     | o- lun2 .............................................. [block/scsi3 (/dev/sdd) (default_tg_pt_gp)]
  |     | o- lun3 .............................................. [block/scsi4 (/dev/sde) (default_tg_pt_gp)]
  |     o- portals ............................................................................ [Portals: 1]
  |       o- 192.168.0.109:3260 ....................................................................... [OK]
  o- loopback ................................................................................. [Targets: 0]
/> 

  放开防火墙端口。

二、客户端配置

  安装 iscsi 客户端：yum install iscsi-initiator-utils
  配置客户端连接名：

[root@whdatarac1 ~]# vi /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e

  启动iscsi客户端，并设置开机自启

[root@whdatarac1 ~]# systemctl restart iscsid
[root@whdatarac1 ~]# systemctl enable iscsid

  通过 iscsiadm 管理工具扫描远程iSCSI服务端，然后查看找到的服务端上有哪些可用的共享存储资源。
  -m discovery 参数的目的是扫描并发现可用的存储资源。
  -t st 参数为执行扫描操作的类型，
  -p 192.168.0.109 参数为iSCSI服务端的IP地址：

[root@whdatarac1 ~]# iscsiadm -m discovery -t st -p 192.168.0.109
192.168.0.109:3260,1 iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e

  登录 iSCSI 服务端：
  -m node 参数为将客户端所在主机作为一台节点服务器。
  -T iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e 参数为要使用的存储资源（也就是上面的输出结果）
  -p 192.168.0.109 参数依然为对方iSCSI服务端的IP地址。
  --login 或 -l 参数进行登录验证。

[root@whdatarac1 ~]# iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e -p 192.168.0.109 -l
Logging in to [iface: default, target: iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e, portal: 192.168.0.109,3260] (multiple)
Login to [iface: default, target: iqn.2003-01.org.linux-iscsi.scsi.x8664:sn.7e2a0b039f3e, portal: 192.168.0.109,3260] successful.

  然后查看，四块硬盘已经成功挂载：

[root@whdatarac1 ~]# lsblk
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda             8:0    0   60G  0 disk 
├─sda1          8:1    0  500M  0 part /boot
└─sda2          8:2    0 59.5G  0 part 
  ├─rhel-root 253:0    0 51.5G  0 lvm  /
  └─rhel-swap 253:1    0    8G  0 lvm  [SWAP]
sdb             8:16   0   30G  0 disk 
sdc             8:32   0   20G  0 disk 
sdd             8:48   0   20G  0 disk 
sde             8:64   0   30G  0 disk