iSCSI磁盘共享-优快云博客

本文链接：https://blog.youkuaiyun.com/doupengqiang/article/details/77505206

概念

iscsi 就是现在自己的磁盘上分出一片区域，在此通过下载 targetcli 实现磁盘存储共享技术

做法

服务端

1：分盘

[root@server ~]# fdisk /dev/vdb

2：下载 targetcli

[

root@server ~]# yum install targetcli -y
[root@server ~]# systemctl start target
[root@server ~]# systemctl status target
target.service - Restore LIO kernel target configuration
   Loaded: loaded (/usr/lib/systemd/system/target.service; disabled)
   Active: active (exited) since Tue 2017-08-22 21:27:37 EDT; 1s ago
  Process: 4450 ExecStart=/usr/bin/targetctl restore (code=exited, status=0/SUCCESS)
 Main PID: 4450 (code=exited, status=0/SUCCESS)

Aug 22 21:27:37 server.example.com target[4450]: No saved config file at /etc/targ...g
Aug 22 21:27:37 server.example.com systemd[1]: Started Restore LIO kernel target c....
Hint: Some lines were ellipsized, use -l to show in full.

3：进入 targetcli

[root@server ~]# 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]

4：创建要共享的磁盘

/> /backstores/block create westos:storagel /dev/vdb1

5：创建共享主机

/> /iscsi create iqn.2017-09.com.example:storagel
Created target iqn.2017-09.com.example:storagel.
Created TPG 1.
/> /iscsi/iqn.2017-09.com.example:storagel/tpg1/portals create 172.25.254.111
Using default IP port 3260
Created network portal 172.25.254.111:3260.

6：创建密码

/> /iscsi/iqn.2017-09.com.example:storagel/tpg1/acls create iqn.2017-09.com.example:storagelkey 
Created Node ACL for iqn.2017-09.com.example:storagelkey
/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json

7：清除

/> clearconfig confirm=True
All configuration cleared

客户端

1：下载iscsi-initiator-utils.x86_64

[root@custom ~]# yum install iscsi-initiator-utils.x86_64 -y
Loaded plugins: langpacks
Package iscsi-initiator-utils-6.2.0.873-21.el7.x86_64 already installed and latest version
Nothing to do

2：编辑文件 /etc/iscsi/initiatorname.iscsi

[root@custom ~]# vim /etc/iscsi/initiatorname.iscsi
############################################
InitiatorName=iqn.2017-08.com.example:storagelkey
#############################################
[root@custom mnt]# systemctl restart iscsid.service 
[root@custom mnt]# systemctl restart iscsi

3：进入共享区并分盘配置文件系统

[root@custom iscsi]# iscsiadm -m node -T iqn.2017-09.com.example:storagel -p 172.25.254.111 -l
[root@custom ~]# fdisk /dev/sda
[root@custom ~]# partprobe
[root@custom ~]# mkfs.xfs /dev/sda1
[root@custom ~]# mount /dev/sda1 /mnt

4：下载 tree

[root@custom ~]# yum install tree.x86_64 -y

5：学会使用 tree

[root@custom ~]# tree -C /var/lib/iscsi/
/var/lib/iscsi/
├── ifaces
├── isns
├── nodes
│   └── iqn.2017-09.com.example:storagel
│       └── 172.25.254.111,3260,1
│           └── default
├── send_targets
│   └── 172.25.254.111,3260
│       ├── iqn.2017-09.com.example:storagel,172.25.254.111,3260,1,default -> /var/lib/iscsi/nodes/iqn.2017-09.com.example:storagel/172.25.254.111,3260,1
│       └── st_config
├── slp
└── static

10 directories, 2 files

6：清除

[root@custom ~]# iscsiadm -m node -T iqn.2017-09.com.example:storagel -u
Logging out of session [sid: 9, target: iqn.2017-09.com.example:storagel, portal: 172.25.254.111,3260]
Logout of [sid: 9, target: iqn.2017-09.com.example:storagel, portal: 172.25.254.111,3260] successful.

lvm 可扩充磁盘的共享

服务端

1:创建 lvm

[root@server ~]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).

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


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: 0x5e76d22e

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048    10487807     5242880   83  Linux

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' 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: 0x5e76d22e

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048    10487807     5242880   8e  Linux LVM

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

Calling ioctl() to re-read partition table.
Syncing disks.
[root@server ~]# partprobe 
[root@server ~]# pvcreate /dev/vdb1
WARNING: dos signature detected on /dev/vdb1 at offset 510. Wipe it? [y/n] y
  Wiping dos signature on /dev/vdb1.
  Physical volume "/dev/vdb1" successfully created
[root@server ~]# vgcreate iscsivg /dev/vdb1
  Volume group "iscsivg" successfully created
[root@server ~]# vgdisplay 
  --- Volume group ---
  VG Name               iscsivg
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               5.00 GiB
  PE Size               4.00 MiB
  Total PE              1279
  Alloc PE / Size       0 / 0   
  Free  PE / Size       1279 / 5.00 GiB
  VG UUID               L7MBEZ-gOBH-KlDe-SQjn-b2uu-CAuA-PeLv1s
   [root@server ~]# lvcreate -l 1279 -n iscsilv0 iscsivg
  Logical volume "iscsilv0" created
[root@server ~]# lvs
  LV       VG      Attr       LSize Pool Origin Data%  Move Log Cpy%Sync Convert
  iscsilv0 iscsivg -wi-a----- 5.00g                                             
[root@server ~]# ll /dev/iscsivg/iscsilv0 
lrwxrwxrwx. 1 root root 7 Aug 22 23:20 /dev/iscsivg/iscsilv0 -> ../dm-0

2：进入 targetcli

3：创建共享 lvm 和密码登录

[root@server ~]# targetcli 
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]
/> /backstores/block create westos:storagel /dev/iscsivg/iscsilv0 
Created block storage object westos:storagel using /dev/iscsivg/iscsilv0.
/> /iscsi create iqn.2017-08.com.example:storagel
Created target iqn.2017-08.com.example:storagel.
Created TPG 1.
/> 
/> /iscsi/iqn.2017-08.com.example:storagel/tpg1/luns create /backstores/block/westos:storagel 
Created LUN 0.
/> /iscsi/iqn.2017-08.com.example:storagel/tpg1/acls create iqn.2017-08.com.example:storagelkey
Created Node ACL for iqn.2017-08.com.example:storagelkey
Created mapped LUN 0.
/> iscsi/iqn.2017-08.com.example:storagel/tpg1/portals create 172.25.254.111
Using default IP port 3260
Created network portal 172.25.254.111:3260.
/> ls
o- / ....................................................................... [...]
  o- backstores ............................................................ [...]
  | o- block ................................................ [Storage Objects: 1]
  | | o- westos:storagel ... [/dev/iscsivg/iscsilv0 (5.0GiB) write-thru activated]
  | o- fileio ............................................... [Storage Objects: 0]
  | o- pscsi ................................................ [Storage Objects: 0]
  | o- ramdisk .............................................. [Storage Objects: 0]
  o- iscsi .......................................................... [Targets: 1]
  | o- iqn.2017-08.com.example:storagel ................................ [TPGs: 1]
  |   o- tpg1 ............................................. [no-gen-acls, no-auth]
  |     o- acls ........................................................ [ACLs: 1]
  |     | o- iqn.2017-08.com.example:storagelkey ................ [Mapped LUNs: 1]
  |     |   o- mapped_lun0 ..................... [lun0 block/westos:storagel (rw)]
  |     o- luns ........................................................ [LUNs: 1]
  |     | o- lun0 ................ [block/westos:storagel (/dev/iscsivg/iscsilv0)]
  |     o- portals .................................................. [Portals: 1]
  |       o- 172.25.254.111:3260 ............................................ [OK]
  o- loopback ....................................................... [Targets: 0]
/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
[root@server ~]# fdisk /dev/vdb

4：扩充磁盘

[root@server ~]# fdisk /dev/vdb
[root@server ~]# partprobe 
[root@server ~]# pvc
pvchange  pvck      pvcreate  
[root@server ~]# pvcreate /dev/vdb1
  Can't initialize physical volume "/dev/vdb1" of volume group "iscsivg" without -ff
[root@server ~]# pvcreate /dev/vdb2
  Physical volume "/dev/vdb2" successfully created
[root@server ~]# vgextend iscsivg /dev/vdb2
  Volume group "iscsivg" successfully extended
[root@server ~]# vgdisplay 
  --- Volume group ---
  VG Name               iscsivg
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               5.97 GiB
  PE Size               4.00 MiB
  Total PE              1528
  Alloc PE / Size       1279 / 5.00 GiB
  Free  PE / Size       249 / 996.00 MiB
  VG UUID               L7MBEZ-gOBH-KlDe-SQjn-b2uu-CAuA-PeLv1s

[root@server ~]# lvextend -L 5500M /dev/iscsivg/iscsilv0 
  Extending logical volume iscsilv0 to 5.37 GiB
  Logical volume iscsilv0 successfully resized

客户端

1：编写文件，配置密码

2：刷新

[root@custom ~]# vim /etc/iscsi/initiatorname.iscsi 
[root@custom ~]# iscsiadm -m discovery -t st -p 172.25.254.111
172.25.254.111:3260,1 iqn.2017-08.com.example:storagel
[root@custom mnt]# systemctl restart iscsid.service 
[root@custom mnt]# systemctl restart iscsi
[root@custom mnt]# iscsiadm -m node -T iqn.2017-08.com.example:storagel -p 172.25.254.111 -l

3：取消挂载，重新挂载，查看磁盘是否扩充

[root@custom mnt]# fdisk -l
[root@custom mnt]# iscsiadm -m node -T iqn.2017-08.com.example:storagel -u
Logging out of session [sid: 15, target: iqn.2017-08.com.example:storagel, portal: 172.25.254.111,3260]
Logout of [sid: 15, target: iqn.2017-08.com.example:storagel, portal: 172.25.254.111,3260] successful.
[root@custom mnt]# iscsiadm -m node -T iqn.2017-08.com.example:storagel -p 172.25.254.111 -l
Logging in to [iface: default, target: iqn.2017-08.com.example:storagel, portal: 172.25.254.111,3260] (multiple)
Login to [iface: default, target: iqn.2017-08.com.example:storagel, portal: 172.25.254.111,3260] successful.
[root@custom mnt]# fdisk -l