iscsi共享分区测试

要求：
在服务器端Server0上创建一个分区/dev/sdb1（无需格式化），配置成iscsi target设备，块设备名称为sun1，iqn名称为iqn.2018-01.com.ultrapower:testserverdisk1，并配置acls仅允许desktop1访问。
在客户端服务器desktop1上使用server0上的分区，将其格式化为500MB的xfs分区，并自动挂载到/mydisk目录下。

一、服务端安装配置
安装软件包
# yum install targetcli

配置防火墙策略
firewall-cmd --permanent --add-port=3260/tcp
firewall-cmd –reload

创建共享设备

[root@server0 ~]# targetcli
targetcli shell version 2.1.fb46
Copyright - by Datera, Inc and others.
For help on commands, type 'help'.
/backstores/block> create san1 /dev/sdb1   --把新分区/dev/sdb1创建为一个块设备，名称为san1
Created block storage object san1 using /dev/sdb1.
/backstores/block> /iscsi create iqn.-.com.ultrapower:testServerDisk1  --创建iscsi设备，并指定名称
Created target iqn.-.com.ultrapower:testserverdisk1.
Created TPG .
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port .

/> ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: ]
  | | o- san1 ......................................................................... [/dev/sdb1 ( bytes) write-thru deactivated]
  | |   o- alua ................................................................................................... [ALUA Groups: ]
  | |     o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized]
  | o- fileio ................................................................................................. [Storage Objects: ]
  | o- pscsi .................................................................................................. [Storage Objects: ]
  | o- ramdisk ................................................................................................ [Storage Objects: ]
  o- iscsi ............................................................................................................ [Targets: ]
  | o- iqn.-.com.ultrapower:testserverdisk1 ........................................................................ [TPGs: ]
  |   o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
  |     o- acls .......................................................................................................... [ACLs: ]
  |     o- luns .......................................................................................................... [LUNs: ]
  |     o- portals .................................................................................................... [Portals: ]
  |       o- 0.0.0.0: ..................................................................................................... [OK]
  o- loopback ......................................................................................................... [Targets: ]
/> 

acls：允许谁访问
lun设备：把iscsi设备和block设备sun1进行关联
portals: 设备iqn监听的端口

#设置acl参数，指明网络上“仅允许desktopX.example.com主机访问”主机可以访问该sicsi设备

/> /iscsi/iqn.-.com.ultrapower:testserverdisk1/tpg1/acls create iqn.-.com.ultrapower:desktop1
Created Node ACL for iqn.-.com.ultrapower:desktop1 

#设置lun参数，指明lun管理的iscsi设备（iqn.2018-01.com.ultrapower:testserverdisk1）对应的块设备为san1 。

/> /iscsi/iqn.-.com.ultrapower:testserverdisk1/tpg1/luns create /backstores/block/san1
Created LUN .
Created LUN -> mapping in node ACL iqn.-.com.ultrapower:desktop1

#设置portal参数，指明共享iscsi设备的IP和端口号，默认为“0.0.0.0 3260”，删除后，重新配置portal参数。

/> /iscsi/iqn.-.com.ultrapower:testserverdisk1/tpg1/portals create 192.168.100.200
Using default IP port
Could not create NetworkPortal in configFS

/> ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: ]
  | | o- san1 ........................................................................... [/dev/sdb1 ( bytes) write-thru activated]
  | |   o- alua ................................................................................................... [ALUA Groups: ]
  | |     o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized]
  | o- fileio ................................................................................................. [Storage Objects: ]
  | o- pscsi .................................................................................................. [Storage Objects: ]
  | o- ramdisk ................................................................................................ [Storage Objects: ]
  o- iscsi ............................................................................................................ [Targets: ]
  | o- iqn.-.com.ultrapower:testserverdisk1 ........................................................................ [TPGs: ]
  |   o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
  |     o- acls .......................................................................................................... [ACLs: ]
  |     | o- iqn.-.com.ultrapower:desktop1 .................................................................. [Mapped LUNs: ]
  |     |   o- mapped_lun0 .................................................................................. [lun0 block/san1 (rw)]
  |     o- luns .......................................................................................................... [LUNs: ]
  |     | o- lun0 ...................................................................... [block/san1 (/dev/sdb1) (default_tg_pt_gp)]
  |     o- portals .................................................................................................... [Portals: ]
  |       o- 0.0.0.0: ..................................................................................................... [OK]
  o- loopback ......................................................................................................... [Targets: ]
/>
/iscsi/iqn..../tpg1/portals> delete 0.0.0.0    --把默认的删除。
Deleted network portal 0.0.0.0:
/iscsi/iqn..../tpg1/portals> cd /
/> iscsi/iqn.-.com.ultrapower:testserverdisk1/tpg1/portals create 192.168.100.200
Using default IP port
Created network portal 192.168.100.200:.
/> saveconfig  --保存退出。
Last  configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
/> exit

服务端配置完成。

[root@server0 ~]# systemctl restart target  --重启target服务

二、客户端安装配置
Desktop服务器上安装iscsi-initiator-utils软件包，或者iscsi*

[root@desktop1 home]# yum install -y iscsi-initiator-utils --安装软件包
[root@desktop1 home]# vi /etc/iscsi/initiatorname.iscsi --修改配置文件
InitiatorName=iqn.2018-01.com.ultrapower:desktop1

[root@desktop1 home]# systemctl restart iscsi --重启并设置开机启动
[root@desktop1 home]# systemctl enable iscsi
[root@desktop1 home]# systemctl restart iscsid.service
[root@desktop1 home]# systemctl enable iscsid.service

发现并登入使用server端的iscsi设备（提示:查看man iscsiadm帮助文档中的EXAMPLE示例）:

[root@desktop1 ~]# iscsiadm --mode discoverydb --type sendtargets --portal 192.168.100.200 --discover
192.168.100.200:, iqn.-.com.ultrapower:testserverdisk1
[root@desktop1 ~]#  iscsiadm --mode node --targetname iqn.-.com.ultrapower:testserverdisk1 --portal 192.168.100.200: --login
Logging in to [iface: default, target: iqn.-.com.ultrapower:testserverdisk1, portal: 192.168.100.200,] (multiple)
Login to [iface: default, target: iqn.-.com.ultrapower:testserverdisk1, portal: 192.168.100.200,] successful.
[root@desktop1 ~]# fdisk -l

Disk /dev/sda: 32.2 GB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk label type: dos
Disk identifier: 0x000d2b42

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *                         Linux
/dev/sda2                     8e  Linux LVM

Disk /dev/mapper/ruskyVG-root: 29.9 GB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes

Disk /dev/mapper/ruskyVG-swap:  MB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes

Disk /dev/sdb:  MB,  bytes,  sectors    --可以看到/dev/sdb磁盘了。
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes

将/dev/sdb磁盘分区500MB，并挂载使用。（题目中并未要求挂载）

[root@desktop1 ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xc17d77c4.

Command (m for help): n
Partition type:
   p   primary ( primary,  extended,  free)
   e   extended
Select (default p): p
Partition number (-, default ):
First sector (-, default ):
Using default value
Last sector, +sectors or +size{K,M,G} (-, default ): +500M
Partition  of type Linux and of size  MiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@desktop1 ~]# partprobe   --刷新分区
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.

[root@desktop1 ~]# mkfs.xfs /dev/sdb1   --格式化分区
meta-data=/dev/sdb1              isize=    agcount=, agsize= blks
         =                       sectsz=   attr=, projid32bit=
         =                       crc=        finobt=, sparse=
data     =                       bsize=   blocks=, imaxpct=
         =                       sunit=      swidth= blks
naming   =version               bsize=   ascii-ci= ftype=
log      =internal log           bsize=   blocks=, version=
         =                       sectsz=   sunit= blks, lazy-count=
realtime =none                   extsz=   blocks=, rtextents=
[root@desktop1 ~]# mkdir /mydisk   --创建挂载目录
[root@desktop1 ~]# mount /dev/sdb1 /mydisk/    ---手动挂载测试
[root@desktop1 ~]# df -h
Filesystem                                  Size  Used Avail Use% Mounted on
/dev/mapper/ruskyVG-root                     28G  .6G   25G  % /
devtmpfs                                    715M       715M   % /dev
tmpfs                                       731M       731M   % /dev/shm
tmpfs                                       731M   36M  696M   % /run
tmpfs                                       731M       731M   % /sys/fs/cgroup
/dev/sda1                                   197M  138M   59M  % /boot
tmpfs                                       147M   12K  147M   % /run/user/
tmpfs                                       147M       147M   % /run/user/
192.168.100.200:/home/guests/testldapuser5   28G  .7G   25G  % /home/guests/testldapuser5
192.168.100.200:/home/guests/testldapuser2   28G  .7G   25G  % /home/guests/testldapuser2
/dev/sr0                                    .8G  .8G      % /mnt/cdrom
/dev/sdb1                                   509M   26M  483M   % /mydisk    ---已经挂载成功了
[root@desktop1 ~]# blkid  /dev/sdb1  --查看/dev/sdb1的UUID，挂载网络设备一定要使用UUID.
/dev/sdb1: UUID="d69a4140-4622-4dc1-823a-e7cfba80b9fa" TYPE="xfs"
[root@desktop1 ~]# vi /etc/fstab    --添加开机自动挂载，增加如下一行。一定要添加_netdev，否则开机会卡死。
UUID=d69a4140--4dc1-823a-e7cfba80b9fa /mydisk xfs     defaults,_netdev