一、简介：
iSCSI，Internet小型计算机系统接口，又称为IP-SAN，是一种基于因特网及SCSI-3协议下的存储技术，由IETF提出，并于2月11日成为正式的标准。iscsi通过TCP/IP协议，实现远程存储单元的本地使用（映射为本地硬盘）
二、实验环境：
iSCSI-Server:服务端centos7 192.168.8.235
iSCSI-Client-linux:客户端centos7 192.168.8.8
iSCSI-Client-Windows:客户端 192.168.8.14
三、实验准备：
设置IP地址、测试网络连通性、关闭服务端的防火墙和selinux
#设置服务端IP：
[root@docker network-scripts]# cd /etc/sysconfig/network-scripts/[root@docker network-scripts]# vim ifcfg-enp0s3 IPADDR=192.168.8.235 #在最后一行加入IP地址
#设置客户端IP：
同上，Windows后面会放图
测试网络连通性：
[root@docker ~]# ping 192.168.8.8
服务端关闭防火墙
[root@docker ~]# systemctl stop firewalld.service
关闭selinux
1、临时关闭：输入命令setenforce 0，重启系统后还会开启。2、永久关闭：输入命令vi /etc/selinux/config，将SELINUX=enforcing改为SELINUX=disabled，然后保存退出。
配置ISCSI的服务端：
准备存储空间
以硬盘的形式存在的：添加一块硬盘 （/dev/sdb)
以文件的形式存在的：dd if=/dev/zero of=/opt/disk.img bs=1024k count=512
四、实验步骤
关闭服务端虚拟机，添加一个网盘
[root@docker ~]# init 0 #关闭虚拟机
2.到虚拟机当前主机上编辑虚拟机设置，为当前主机添加一块本地磁盘：
3.查看磁盘信息、是否添加成功
[root@docker ~]# fdisk -l 磁盘 /dev/sda：53.7 GB, 53687091200 字节，104857600 个扇区Units = 扇区 of 1 * 512 = 512 bytes扇区大小(逻辑/物理)：512 字节 / 512 字节I/O 大小(最小/最佳)：512 字节 / 512 字节磁盘标签类型：dos磁盘标识符：0x000ddd2a设备 BootStart EndBlocks Id System/dev/sda1 * 204820991991048576 83 Linux/dev/sda2 20992955512098176 82 Linux swap / Solaris/dev/sda3 6295552 104857599 49281024 83 Linux磁盘 /dev/sdb：24.7 GB, 24696061952 字节，48234496 个扇区Units = 扇区 of 1 * 512 = 512 bytes扇区大小(逻辑/物理)：512 字节 / 512 字节I/O 大小(最小/最佳)：512 字节 / 512 字节
4 .创建文件
[root@docker dev]# dd if=/dev/zero of=/opt/disk.img bs=1024k count=512记录了512+0 的读入记录了512+0 的写出536870912字节(537 MB)已复制，0.814878 秒，659 MB/秒[root@docker dev]# cd /opopp/ opt/ [root@docker dev]# cd /opt[root@docker opt]# lscni containerd disk.img test-scp 网络设备监控 - 副本.zip
安装iscsi服务端：targetd、targetcli
[root@docker network-scripts]# yum -y install targetd targetcli
6.调用targetcli命令进行设置:
创建iscsi磁盘创建服务端程序创建服务卷luns5.4 创建客户端连接器（启用chap认证）
[root@docker network-scripts]# targetcli
Warning: Could not load preferences file /root/.targetcli/prefs.bin.targetcli shell version 2.1.53Copyright - by Datera, Inc and others.For help on commands, type 'help'./> lso- / ......................................................................................... [...]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]/> /backstores/block create idisk2 /dev/sdb #创建iscsi第一块磁盘Created block storage object idisk2 using /dev/sdb./> lso- / ......................................................................................... [...]o- backstores .............................................................................. [...]| o- block .................................................................. [Storage Objects: 1]| | o- idisk2 ........................................ [/dev/sdb (23.0GiB) write-thru deactivated]| | 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]/> /backstores/fileio create idisk3 /opt/disk.img #创建iscsi第二块磁盘Created fileio idisk3 with size 536870912/> lso- / ......................................................................................... [...]o- backstores .............................................................................. [...]| o- block .................................................................. [Storage Objects: 1]| | o- idisk2 ........................................ [/dev/sdb (23.0GiB) write-thru deactivated]| | o- alua ................................................................... [ALUA Groups: 1]| |o- default_tg_pt_gp ....................................... [ALUA state: Active/optimized]| o- fileio ................................................................. [Storage Objects: 1]| | o- idisk3 .................................. [/opt/disk.img (512.0MiB) write-back deactivated]| | o- alua ................................................................... [ALUA Groups: 1]| |o- default_tg_pt_gp ....................................... [ALUA state: Active/optimized]| o- pscsi .................................................................. [Storage Objects: 0]| o- ramdisk ................................................................ [Storage Objects: 0]o- iscsi ............................................................................ [Targets: 0]o- loopback ......................................................................... [Targets: 0]/> iscsi/ create iqn.-:server #创建服务端程序Created target iqn.-:server.Created TPG 1.Global pref auto_add_default_portal=trueCreated default portal listening on all IPs (0.0.0.0), port 3260./> lso- / ......................................................................................... [...]o- backstores .............................................................................. [...]| o- block .................................................................. [Storage Objects: 1]| | o- idisk2 ........................................ [/dev/sdb (23.0GiB) write-thru deactivated]| | o- alua ................................................................... [ALUA Groups: 1]| |o- default_tg_pt_gp ....................................... [ALUA state: Active/optimized]| o- fileio ................................................................. [Storage Objects: 1]| | o- idisk3 .................................. [/opt/disk.img (512.0MiB) write-back deactivated]| | o- alua ................................................................... [ALUA Groups: 1]| |o- default_tg_pt_gp ....................................... [ALUA state: Active/optimized]| o- pscsi .................................................................. [Storage Objects: 0]| o- ramdisk ................................................................ [Storage Objects: 0]o- iscsi ............................................................................ [Targets: 1]| o- iqn.-:server ......................................................... [TPGs: 1]| o- tpg1 ............................................................... [no-gen-acls, no-auth]|o- acls .......................................................................... [ACLs: 0]|o- luns .......................................................................... [LUNs: 0]|o- portals .................................................................... [Portals: 1]| o- 0.0.0.0:3260 ..................................................................... [OK]o- loopback ......................................................................... [Targets: 0]/> cd iscsi/iqn.-:server/tpg1/ #进入服务端程序/iscsi/iqn.20...c:server/tpg1> luns/ create #创建服务卷backstores/block/idisk2 Created LUN 0./iscsi/iqn.20...c:server/tpg1> luns/ create #创建服务卷/backstores/fileio/idisk3 Created LUN 1./iscsi/iqn.20...c:server/tpg1> lso- tpg1 ..................................................................... [no-gen-acls, no-auth]o- acls ................................................................................ [ACLs: 0]o- luns ................................................................................ [LUNs: 2]| o- lun0 ........................................... [block/idisk2 (/dev/sdb) (default_tg_pt_gp)]| o- lun1 ..................................... [fileio/idisk3 (/opt/disk.img) (default_tg_pt_gp)]o- portals .......................................................................... [Portals: 1]o- 0.0.0.0:3260 ........................................................................... [OK]/iscsi/iqn.20...c:server/tpg1> cd acls /iscsi/iqn.20...ver/tpg1/acls> lso- acls .................................................................................. [ACLs: 0]/iscsi/iqn.20...ver/tpg1/acls> cd ../iscsi/iqn.20...c:server/tpg1> acls/ create iqn.-:client #创建客户端连接器Created Node ACL for iqn.-:clientCreated mapped LUN 1.Created mapped LUN 0./iscsi/iqn.20...c:server/tpg1> lso- tpg1 ..................................................................... [no-gen-acls, no-auth]o- acls ................................................................................ [ACLs: 1]| o- iqn.-:client .................................................. [Mapped LUNs: 2]| o- mapped_lun0 ...................................................... [lun0 block/idisk2 (rw)]| o- mapped_lun1 ..................................................... [lun1 fileio/idisk3 (rw)]o- luns ................................................................................ [LUNs: 2]| o- lun0 ........................................... [block/idisk2 (/dev/sdb) (default_tg_pt_gp)]| o- lun1 ..................................... [fileio/idisk3 (/opt/disk.img) (default_tg_pt_gp)]o- portals .......................................................................... [Portals: 1]o- 0.0.0.0:3260 ........................................................................... [OK]/iscsi/iqn.20...c:server/tpg1> cd acls/iqn.-:client//iscsi/iqn.20...:client> set auth userid=vec #创建用户Parameter userid is now 'vec'./iscsi/iqn.20...:client> set auth password=112233445566 #设置密码Parameter password is now '112233445566'./iscsi/iqn.20...:client> cd //> lso- / ......................................................................................... [...]o- backstores .............................................................................. [...]| o- block .................................................................. [Storage Objects: 1]| | o- idisk2 .......................................... [/dev/sdb (23.0GiB) write-thru activated]| | o- alua ................................................................... [ALUA Groups: 1]| |o- default_tg_pt_gp ....................................... [ALUA state: Active/optimized]| o- fileio ................................................................. [Storage Objects: 1]| | o- idisk3 .................................... [/opt/disk.img (512.0MiB) write-back activated]| | o- alua ................................................................... [ALUA Groups: 1]| |o- default_tg_pt_gp ....................................... [ALUA state: Active/optimized]| o- pscsi .................................................................. [Storage Objects: 0]| o- ramdisk ................................................................ [Storage Objects: 0]o- iscsi ............................................................................ [Targets: 1]| o- iqn.-:server ......................................................... [TPGs: 1]| o- tpg1 ............................................................... [no-gen-acls, no-auth]|o- acls .......................................................................... [ACLs: 1]|| o- iqn.-:client ............................................ [Mapped LUNs: 2]|| o- mapped_lun0 ................................................ [lun0 block/idisk2 (rw)]|| o- mapped_lun1 ............................................... [lun1 fileio/idisk3 (rw)]|o- luns .......................................................................... [LUNs: 2]|| o- lun0 ..................................... [block/idisk2 (/dev/sdb) (default_tg_pt_gp)]|| o- lun1 ............................... [fileio/idisk3 (/opt/disk.img) (default_tg_pt_gp)]|o- portals .................................................................... [Portals: 1]| o- 0.0.0.0:3260 ..................................................................... [OK]o- loopback ......................................................................... [Targets: 0]/>
exit 退出
5.5 重启targetd服务，并配置开机自动运行
[root@docker ~]# systemctl restart targetd[root@docker ~]# systemctl enable targetd
6.客户端配置（Linux）
1 安装iscsid的客户端:iscsi-initiator-utils
[root@jbjb ~]#cd /media/cdrom/Packages/[root@jbjb Packages]#yum -y install iscsi-initiator-utils
2 修改iscsi的配置文件：/etc/iscsi/
[root@jbjb Packages]#cd /etc/iscsi/
initiatorname.iscsi #定义客户端连接器的名称 iqn.-:client
iscsid.conf：启用chap认证、配置服务器设定的用户与密码
启用chap认证
配置服务器设定的用户与密码
3 .启动iscsid服务，启动后刚配置的才会生效
[root@jbjb iscsi]# systemctl restart iscsid
4.发现存储服务器
[root@jbjb iscsi]# iscsiadm -m discovery -t st -p 192.168.8.235192.168.8.235:3260,1 iqn.-:server
5.登录存储服务器
[root@jbjb iscsi]# iscsiadm -m node -T iqn.-:server -p 192.168.8.235 -l #登录
6.查看iscsi"网盘" : lsblk
磁盘使用使用：
7.1格式化
[root@jbjb iscsi]# mkfs.xfs -f /dev/sdc 格式化sdc盘
7.2挂载
[root@jbjb iscsi]# mount /dev/sdc /mnt/usb/ 挂载sdc到客户端的/mnt/usb/
7.3添加文件测试
[root@jbjb iscsi]# echo 11111111 > /mnt/usb/2.txt[root@jbjb iscsi]# ll /mnt/usb/总用量 4-rw-r--r-- 1 root root 9 12月 19 06:01 2.txt
8.卸载存储服务器
先解除卸载
[root@jbjb iscsi]# umount -l /dev/sdc
然后执行
[root@jbjb iscsi]# iscsiadm -m node -T iqn.-:server -p 192.168.8.235 -u
7.Windows客户端配置
调出程序属性
目标处填写服务端IP
卷和设备处点击自动配置
进入计算机管理，查看磁盘是否共享成功
