Linux下iscsi的配置与使用
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iscsi 配置
SCSI目标配置
安装iSCSI目标软件包:
# yum install -y targetcli
启动服务:
# systemctl enable target; systemctl start target
进入iSCSI目标交互式配置模式:
# targetcli
www.westos.org
8Demo
/> 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 server0.disk1 /dev/iSCSI_vg/disk1_lv
Created block storage object server0.disk1 using /dev/iSCSI_vg/disk1_lv.
/> /iscsi create iqn.2014-12.com.example:server0
Created target iqn.2014-12.com.example:server0.
Created TPG 1.
www.westos.org
/> /iscsi/iqn.2014-12.com.example:server0/tpg1/acls create iqn.2014-12.com.example:desktop0
Created Node ACL for iqn.2014-12.com.example:desktop0
/> /iscsi/iqn.2014-12.com.example:server0/tpg1/luns create /backstores/block/server0.disk1
Created LUN 0.
Created LUN 0->0 mapping in node ACL iqn.2014-12.com.example:desktop0
/> /iscsi/iqn.2014-12.com.example:server0/tpg1/portals create 172.25.0.11
Using default IP port 3260
Created network portal 172.25.0.11:3260.
/> exit
1访问iSCSI存储
安装iSCSI发起端软件包:
# yum install -y iscsi-initiator-utils
在/etc/iscsi/initiatorname.iscsi中设置发起端的IQN:
InitiatorName=iqn.2014-12.com.example:desktop0
查找iSCSI服务器所提供的iSCSI目标(目标门户)
# iscsiadm -m discovery -t st -p 172.25.0.11
登录服务器上的一个或多个iscsi目标
# iscsiadm -m node -T iqn.2024-12.com.example:server0 -p
172.25.0.11 -l
2
此时,可以使用iSCSI磁盘,就好像它是本地连接硬盘驱动器。
可以挂载现有文件系统。如果磁盘未格式化,可以通过fdisk进行分区,例如,通过文件系统格式化分区或作为LVM物理卷。
在/etc/fstab中永久挂载文件系统
（1）. 使用blkid确定文件系统UUID并使用UUID挂载,而不是/dev/sd*设备名称。(每次
引导时显示的设备名称都不同,具体取决于iSCSI设备通过网络进行响应的顺序。
如果按设备名称挂载,这会导致使用错误的设备。)
（2）. 在/etc/fstab中使用_netdev作为挂载选项。(这将确保客户端不会尝试挂载文件系
统,直至启用联网。否则,在引导时系统将出错。)
（3）. 确保iscsi服务在引导时启动。
12中断使用iSCSI目标
确保没有使用目标所提供的任何设备。
确保从/etc/fstab等位置中删除使用目标的所有永久挂载。
登出iSCSI目标,以暂时断开连接。
# iscsiadm -m node -T iqn.2010-09.com.example:rdisks.demo -p 192.168.0.254 -u
删除iSCSI目标的本地记录,以永久断开连接。
# iscsiadm -m node -T iqn.2010-09.com.example:rdisks.demo -p 192.168.0.254 -o delete
操作实例
服务端
[root@server etc]# yum install targetcli -y
Loaded plugins: langpacks
Resolving Dependencies
--> Running transaction check
---> Package targetcli.noarch 0:2.1.fb34-1.el7 will be installed
--> Processing Dependency: python-rtslib >= 2.1.fb41 for package: targetcli-2.1.fb34-1.el7.noarch
--> Processing Dependency: python-configshell for package: targetcli-2.1.fb34-1.el7.noarch
--> Running transaction check
---> Package python-configshell.noarch 1:1.1.fb11-3.el7 will be installed
--> Processing Dependency: pyparsing for package: 1:python-configshell-1.1.fb11-3.el7.noarch
--> Processing Dependency: python-urwid for package: 1:python-configshell-1.1.fb11-3.el7.noarch
---> Package python-rtslib.noarch 0:2.1.fb46-1.el7 will be installed
--> Processing Dependency: python-kmod for package: python-rtslib-2.1.fb46-1.el7.noarch
--> Running transaction check
---> Package pyparsing.noarch 0:1.5.6-9.el7 will be installed
---> Package python-kmod.x86_64 0:0.9-4.el7 will be installed
---> Package python-urwid.x86_64 0:1.1.1-3.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================
Package Arch Version Repository
Size
================================================================
Installing:
targetcli noarch 2.1.fb34-1.el7 rhel_dvd 55 k
Installing for dependencies:
pyparsing noarch 1.5.6-9.el7 rhel_dvd 94 k
python-configshell noarch 1:1.1.fb11-3.el7 rhel_dvd 64 k
python-kmod x86_64 0.9-4.el7 rhel_dvd 57 k
python-rtslib noarch 2.1.fb46-1.el7 rhel_dvd 75 k
python-urwid x86_64 1.1.1-3.el7 rhel_dvd 654 k
Transaction Summary
================================================================
Install 1 Package (+5 Dependent packages)
Total download size: 998 k
Installed size: 3.9 M
Downloading packages:
(1/6): python-configshell-1.1.fb11-3.el7.n | 64 kB 00:00
(2/6): pyparsing-1.5.6-9.el7.noarch.rpm | 94 kB 00:00
(3/6): python-kmod-0.9-4.el7.x86_64.rpm | 57 kB 00:00
(4/6): python-rtslib-2.1.fb46-1.el7.noarch | 75 kB 00:00
(5/6): targetcli-2.1.fb34-1.el7.noarch.rpm | 55 kB 00:00
(6/6): python-urwid-1.1.1-3.el7.x86_64.rpm | 654 kB 00:00
----------------------------------------------------------------
Total 5.5 MB/s | 998 kB 00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : python-kmod-0.9-4.el7.x86_64 1/6
Installing : python-rtslib-2.1.fb46-1.el7.noarch 2/6
Installing : pyparsing-1.5.6-9.el7.noarch 3/6
Installing : python-urwid-1.1.1-3.el7.x86_64 4/6
Installing : 1:python-configshell-1.1.fb11-3.el7.noarch 5/6
Installing : targetcli-2.1.fb34-1.el7.noarch 6/6
Verifying : python-rtslib-2.1.fb46-1.el7.noarch 1/6
Verifying : python-urwid-1.1.1-3.el7.x86_64 2/6
Verifying : targetcli-2.1.fb34-1.el7.noarch 3/6
Verifying : 1:python-configshell-1.1.fb11-3.el7.noarch 4/6
Verifying : pyparsing-1.5.6-9.el7.noarch 5/6
Verifying : python-kmod-0.9-4.el7.x86_64 6/6
Installed:
targetcli.noarch 0:2.1.fb34-1.el7
Dependency Installed:
pyparsing.noarch 0:1.5.6-9.el7
python-configshell.noarch 1:1.1.fb11-3.el7
python-kmod.x86_64 0:0.9-4.el7
python-rtslib.noarch 0:2.1.fb46-1.el7
python-urwid.x86_64 0:1.1.1-3.el7
Complete!
[root@server etc]# 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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xf14beb9f.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response 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): +500M
Partition 1 of type Linux and of size 500 MiB is set
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@server etc]# partprobe
[root@server etc]# 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:storage1 /dev/vdb1
Created block storage object westos:storage1 using /dev/vdb1.
/> iscsi create iqn.2017-05.com.example:strage1.
Command not found iscsi
/> /iscsi create iqn.2017-05.com.example:strage1.
Created target iqn.2017-05.com.example:strage1..
Created TPG 1.
/> /iscsi/iqn.2017-05.com.example:key1
No such path /iscsi/iqn.2017-05.com.example:key1
/> /iscsi/iqn.2017-05.com.example:strage1/tpg1/acls creat iqn.2017-05.com.example:key1
No such path /iscsi/iqn.2017-05.com.example:strage1
/> /iscsi iqn.2017-05.com.example:strage1/tpg1/acls creat iqn.2017-05.com.example:key1
Command not found iqn
/> /iscsi/iqn.2017-05.com.example:strage1/tpg1/acls creat iqn.2017-05.com.example:key1
/> /iscsi/iqn.2017-05.com.example:strage1/tpg1/acls creat iqn.20/> /iscsi/iqn.2017-05.com.example:strage1./tpg1/acls creae iqn.2017-05.com.example:key1
Command not found creae
/> /iscsi/iqn.2017-05.com.example:strage1./tpg1/acls create iqn.2017-05.com.example:key1
Created Node ACL for iqn.2017-05.com.example:key1
/> /iscsi/iqn.2017-05.com.example:strage1./tpg1/luns create /backstores/block/westos:storage1
Created LUN 0.
Created LUN 0->0 mapping in node ACL iqn.2017-05.com.example:key1
/> /iscsi/iqn.2017-05.com.example:strage1./tpg1/portals
/iscsi/iqn.20.../tpg1/portals> create 172.25.37.11
Using default IP port 3260
Created network portal 172.25.37.11:3260.
/iscsi/iqn.20.../tpg1/portals>
/iscsi/iqn.20.../tpg1/portals> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
客户端
[root@desktop37 ~]# yum search iscsi
Loaded plugins: langpacks
=========================== N/S matched: iscsi ============================
iscsi-initiator-utils.i686 : iSCSI daemon and utility programs
iscsi-initiator-utils.x86_64 : iSCSI daemon and utility programs
iscsi-initiator-utils-iscsiuio.x86_64 : Userspace configuration daemon
: required for some iSCSI hardware
libiscsi.i686 : iSCSI client library
libiscsi.x86_64 : iSCSI client library
Name and summary matches only, use "search all" for everything.
[root@desktop37 ~]# yum install iscsi-initiator-utils.x86_64
Loaded plugins: langpacks
Package iscsi-initiator-utils-6.2.0.873-21.el7.x86_64 already installed and latest version
Nothing to do
[root@desktop37 ~]# vim /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2017-05.com.example:key1 ##新建的钥匙
[root@desktop37 ~]# systemctl restart iscsi
[root@desktop37 ~]# iscsiadm -m discovery -t st -p 172.25.37.11
172.25.37.11:3260,1 iqn.2017-05.com.example:strage1.
[root@desktop37 ~]# iscsiadm -m node -T iqn.2017-05.com.example:strage1. -p 172.25.37.11 -l
Logging in to [iface: default, target: iqn.2017-05.com.example:strage1., portal: 172.25.37.11,3260] (multiple)
Login to [iface: default, target: iqn.2017-05.com.example:strage1., portal: 172.25.37.11,3260] successful.
[root@desktop37 ~]# fdisk -l
Disk /dev/vda: 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: 0x00013f3e
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 20970332 10484142+ 83 Linux
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 /dev/sda: 524 MB, 524288000 bytes, 1024000 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
[root@desktop37 ~]# fdisk /dev/sda
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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x0704537c.
Command (m for help):
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (8192-1023999, default 8192):
Using default value 8192
Last sector, +sectors or +size{K,M,G} (8192-1023999, default 1023999): +100M
Partition 1 of type Linux and of size 100 MiB is set
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@desktop37 ~]# mkfs.xfs /dev/sda1
meta-data=/dev/sda1 isize=256 agcount=4, agsize=6400 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=25600, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@desktop37 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 10473900 3174412 7299488 31% /
devtmpfs 927072 0 927072 0% /dev
tmpfs 942660 80 942580 1% /dev/shm
tmpfs 942660 17024 925636 2% /run
tmpfs 942660 0 942660 0% /sys/fs/cgroup
[root@desktop37 ~]# mount /dev/sda1 /mnt
[root@desktop37 ~]# touch file
(2)卸载服务
客户端
[root@desktop37 ~]# iscsiadm -m node -T iqn.2017-05.com.example:strage1. -p 172.25.37.11 -u
Logging out of session [sid: 1, target: iqn.2017-05.com.example:strage1., portal: 172.25.37.11,3260]
Logout of [sid: 1, target: iqn.2017-05.com.example:strage1., portal: 172.25.37.11,3260] successful.
[root@desktop37 ~]# iscsiadm -m node -T iqn.2017-05.com.example:strage1. -p 172.25.37.11 -o delete
[root@desktop37 ~]# fdisk -l
Disk /dev/vda: 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: 0x00013f3e
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 20970332 10484142+ 83 Linux
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
服务端
[root@server etc]# targetcli
targetcli shell version 2.1.fb34
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.
/> clearconfig confirm=True
All configuration cleared
/> 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 etc]# 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]
/>
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