iSCSI远程块存储

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1.iscsi是直接对设备进行共享的服务

iSCSI(Internet SCSI)支持从客户端(发起端)通过IP向远程服务器上的

SCSI存储设备(目标)发送SCSI命令。iSCSI限定名称用于确定发起端和目

标,并采用iqn.yyyy-mm.{reverse domain}:label的格式。默认情况下,网络

通信是至iSCSI目标上的端口3260/tcp的明文。

 iSCSI发起端:需要访问原始SAN存储的客户端。

 iSCSI目标:从iSCSI服务器提供的远程硬盘磁盘,或“目标门户”

 iSCSI目标门户:通过网络向发起端提供目标的服务器。

 IQN:“iSCSI限定名称”。每个发起端和目标需要唯一名称进行标识,

最好的做法是使用一个在Internet上可能独一无二的名称。

 

2.启动iscsi共享设备

1>在server上

建立一个lvm设备

[[email protected] ~]# fdisk /dev/vdb

Command (m for help): n

Partition type:

   p   primary (0 primary, 0 extended, 4 free)

   e   extended

Select (default p): p

Partition number (1-4, default 1):

First sector (2048-20971519, default 2048):

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): +1000M

Partition 1 of type Linux and of size 1000 MiB is set

 

Command (m for help): t

Selected partition 1

Hex code (type L to list all codes): p

Changed type of partition 'Linux' to 'unknown'

 

Command (m for help): t

Selected partition 1

Hex code (type L to list all codes): 8e

Changed type of partition 'Empty' to 'Linux LVM'

 

Command (m for help): p

 

Disk /dev/vdb: 10.7 GB, 10737418240 bytes, 20971520 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0xfee851aa

 

   Device Boot      Start         End      Blocks   Id  System

/dev/vdb1            2048     2050047     1024000   8e  Linux LVM

 

[[email protected] ~]# partprobe

[[email protected] ~]# pvcreate /dev/vdb1

  Physical volume "/dev/vdb1" successfully created

[[email protected] ~]# vgcreate vg0 /dev/vdb1

  Volume group "vg0" successfully created

[[email protected] ~]# lvcreate -l 249 -n iscsi_storage vg0

  Logical volume "iscsi_storage" created

[[email protected] ~]# lvs

  LV            VG   Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert

  iscsi_storage vg0  -wi-a----- 996.00m  

 

 

安装 yum install targetcli -y

[[email protected] ~]# systemctl enable target

[[email protected] ~]# systemctl stop firewalld

[[email protected] ~]# targetcli

 

/> ls

/> /backstores/block create server1storage /dev/vg0/iscsi_storage                ##将/dev/vg0重新命名

/> /iscsi create iqn.2017-06.com.example:strage1

/> ls

/> /iscsi/iqn.2017-06.com.example:strage1/tpg1/luns create /backstores/block/server1storage          ##钥匙和设备匹配

/> /iscsi/iqn.2017-06.com.example:strage1/tpg1/acls create iqn.2017-06.com.example:server1storagekey ##创建钥匙

/> /iscsi/iqn.2017-06.com.example:strage1/tpg1/portals create 172.25.2.11    ##开启设备端口

/> exit

Global pref auto_save_on_exit=true

Last 10 configs saved in /etc/target/backup.

Configuration saved to /etc/target/saveconfig.json       ##退出后所做的设定保存在此

  

2>在deskotp上

[[email protected] ~]# vim /etc/iscsi/initiatorname.iscsi

InitiatorName=iqn.2017-06.com.example:server1storagekey       ##添加钥匙

[[email protected] ~]# systemctl restart iscsi

[[email protected] ~]# fdisk -l

[[email protected] ~]# iscsiadm -m discovery -t st -p 172.25.2.11  ##查找

172.25.2.11:3260,1 iqn.2017-06.com.example:strage1

[[email protected] ~]# iscsiadm -m node -T iqn.2017-06.com.example:strage1 -p 172.25.2.11 -l  ##登陆

Logging in to [iface: default, target: iqn.2017-06.com.example:strage1, portal: 172.25.2.11,3260] (multiple)

Login to [iface: default, target: iqn.2017-06.com.example:strage1, portal: 172.25.2.11,3260] successful.

[[email protected] ~]# fdisk -l

Disk /dev/sda: 1044 MB, 1044381696 bytes, 2039808 sectors

[[email protected] ~]# fdisk /dev/sda

[[email protected] ~]# partprobe

[[email protected] ~]# mkfs.xfs /dev/sda1

[[email protected] ~]# mount /dev/sda1 /mnt   ##实现直接访问服务器存储器

[[email protected] ~]# df

[[email protected] ~]# yum install tree.x86_64  -y

[[email protected] ~]# tree -C /var/lib/iscsi/    ##查看存储信息

 

 

3.挂载

[[email protected] ~]# blkid

/dev/sda1: UUID="a90b98d2-4ee9-4b49-ab82-b4bf4b3cd673" TYPE="xfs"

[[email protected] ~]# vim /etc/fstab

UUID="a90b98d2-4ee9-4b49-ab82-b4bf4b3cd673" /mnt xfs defaults 0 0

[[email protected] ~]# mount -a

[[email protected] ~]# df

[[email protected] ~]# reboot^C

 

4.删除

[[email protected] ~]# umount /mnt

[[email protected] ~]# vim /etc/fstab

[[email protected] ~]# iscsiadm -m node -T iqn.2017-06.com.example:strage1 -p 172.25.2.11 -u            ##登出

[[email protected] ~]# iscsiadm -m node -T iqn.2017-06.com.example:strage1 -p 172.25.2.11 -o delete  ##删除

 

[[email protected] ~]# targetcli

/> clearconfig confirm=True

All configuration cleared

/> ls