ISCSI———— 远程块存储
ISCSI共享出去的是硬盘 其他共享出的是文件系统
该协议可以用TCP/IP对SCSI指令进行封装，使得这些指令能够通过基于P网络进行传输，从而实现SCSI 和TCP/IP协议的连接。对于局域网环境中的用户来说，采用该标准只需要不多的投资就可以方便、快捷地对信息和数据进行交互式传输及管理。
一.安装服务
*）服务端
（1)服务端分出一个可供共享的硬盘分区
partprobe ##同步分区表
（2）安装服务
*）yum install targetcli -y
*）systemctl start target
现在我们还没有共享任何设备
(3)配置出共享的硬盘分区
/> /backstores/block create zl:storage1 /dev/vdb1 ##给你的硬盘起一个在targetcli中访问的新名字(服务端自己看)
Created block storage object zl:storage1 using /dev/vdb1.
/> /iscsi create iqn.2017-12.com.example:storage1 ##给你的共享硬盘其一个名字（客户端看）
Created target iqn.2017-12.com.example:storage1.
/> /iscsi/iqn.2017-12.com.example:storage1/tpg1/acls create iqn.2017-12.com.example:zlkey ##给你的设备加一个key 有key的用户可以访问
Created Node ACL for iqn.2017-12.com.example:zlkey
/> /iscsi/iqn.2017-12.com.example:storage1/tpg1/luns create /backstores/block/zl:storage1 ##创建链接 客户访问/iscsi/iqn.2017-12.com.example:storage1/tpg1/luns 实际上是访问/backstores/block/zl:storage1
Created LUN 0.
Created LUN 0->0 mapping in node ACL iqn.2017-12.com.example:zlkey
/> iscsi/iqn.2017-12.com.example:storage1/tpg1/portals create 172.25.254.210 ##开启一个服务的端口
Using default IP port 3260 ##端口为3260
Created network portal 172.25.254.210:3260.
/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
*）[[email protected] nfs]# firewall-cmd --permanent --add-port=3260/tcp ##火墙策略添加端口
*）[[email protected] nfs]# firewall-cmd --reload ##重新加载火墙策略
（4）删除共享的设备
/> clearconfig confirm=true ##确认删除设备
All configuration cleared
/> ls ##没有共享设备了
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]
/>
二.客户端的使用
*）客户端
1.安装服务
[[email protected] nfs]# yum install iscsi-initiator-utils -y ##安装软件
[[email protected] nfs]# systemctl start iscsi ##开启服务
[[email protected] nfs]# vim /etc/iscsi/initiatorname.iscsi ##编辑key文件
InitiatorName=iqn.2017-12.com.example:zlkey
[[email protected] nfs]# systemctl restart iscsi ##重启服务
2.发现服务端的设备
[[email protected] nfs]# iscsiadm -m discovery -t st -p 172.25.254.210 ##发现210主机下的共享设备 -m动作 -t类型 -p ip地址
172.25.254.210:3260,1 iqn.2017-12.com.example:storage1
[[email protected] nfs]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.210 -l ##开启设备节点
Logging in to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.210,3260] (multiple)
Login to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.210,3260] successful.
3.挂载并使用设备
[[email protected] nfs]# fdisk -l ##发现设备
Disk /dev/sda: 5368 MB, 5368709120 bytes, 10485760 sectors ##共享设备可用了
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 4194304 bytes
[[email protected] nfs]# fdisk /dev/sda ##分区
[[email protected] nfs]# partprobe ##同步分区表
[[email protected] nfs]# mkfs.xfs /dev/sda1
[[email protected] nfs]# mount /dev/sda1 /mnt ##挂载
注：此时在/mnt下创建的东西 实际创建在了服务端的/dev/vdb1中 但服务端看不了没有文件系统
4.开机自动挂载
[[email protected] nfs]# vim /etc/fstab ##编辑配置文件 实现开机自动挂载
5.删除设备*）不删除文件记录 仅删除设备[[email protected] ~]# umount /mnt
##卸载设备[[email protected] ~]# yum install tree.x86_64
##安装tree[[email protected] ~]# tree /var/lib/iscsi/
##用tree查看其文件
*）彻底删除设备及文件[[email protected] ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.210 -u[[email protected] ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1
-p 172.25.254.210 -o delete[[email protected] ~]# tree /var/lib/iscsi/[[email protected] ~]# systemctl restart iscsi[[email protected] ~]# fdisk -l
三.扩大共享硬盘的容量
*）服务端1.制作lvm硬盘空间
2.配置targetcli
[[email protected] nfs]# targetcli
/> /backstores/block create zl:storage1 /dev/iscsi_vg/iscsi_lv0
Created block storage object zl:storage1 using /dev/iscsi_vg/iscsi_lv0.
/> /iscsi create iqn.2017-12.com.example:storage1
Created target iqn.2017-12.com.example:storage1.
Created TPG 1.
/> /iscsi/iqn.2017-12.com.example:storage1/tpg1/acls create iqn.2017-12.com.example:zlkey1
/> /iscsi/iqn.2017-12.com.example:storage1/tpg1/luns create /backstores/block/zl/> /iscsi/iqn.2017-12./> /iscsi/iqn.2017-12.com.example:storage1/tpg1/luns create /backstores/block/zl:storage1
Created LUN 0.
/> /iscsi/iqn.2017-12.com.example:storage1/tpg1/portals create 172.25.254.210
Using default IP port 3260
Created network portal 172.25.254.210:3260.
*）客户端
1.更改key
[[email protected] ~]# vim /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2017-12.com.example:zlkey1
[[email protected] ~]# systemctl restart iscsi
2.发现设备
[[email protected] ~]# iscsiadm -m discovery -t st -p 172.25.254.210
172.25.254.210:3260,1 iqn.2017-12.com.example:storage1
[[email protected] ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.210 -l
Logging in to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.210,3260] (multiple)
Login to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.210,3260] successful.
[[email protected] ~]# fdisk -l
Disk /dev/sda: 1069 MB, 1069547520 bytes, 2088960 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 4194304 bytes
3.扩大设备
*）服务端
[[email protected] nfs]# fdisk /dev/vdb
-n -p -1 - -1G -t -8e -wq
[[email protected] nfs]# partprobe
[[email protected] nfs]# pvcreate /dev/vdb2
Physical volume "/dev/vdb2" successfully created
[[email protected] nfs]# vgextend iscsi_vg /dev/vdb2
Volume group "iscsi_vg" successfully extended
[[email protected] nfs]# lvextend -L 1500M /dev/iscsi_vg/iscsi_lv0
Extending logical volume iscsi_lv0 to 1.46 GiB
Logical volume iscsi_lv0 successfully resized
[[email protected] nfs]# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
iscsi_lv0 iscsi_vg -wi-ao---- 1.46g
*）客户端
[[email protected] ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.210 -u
[[email protected] ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.210 -l
[[email protected] ~]# fdisk -l
Disk /dev/sda: 1572 MB, 1572864000 bytes, 3072000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 4194304 bytes