本文的初衷仅供自己做备忘笔记, 内容大多从网上搜集和整理, 并非都是自己原创.
参考的来源我会在后面注明, 对于可能遗漏的来源, 还请相关原创作者提醒, 非常感谢.
参考来源
https://blog.csdn.net/nnuljl/article/details/38237437
https://www.ubuntubar.com/y2019/403.html
https://help.ubuntu.com/lts/serverguide/iscsi-initiator.html
一开始准备用samba做文件共享, 但后来配置过程中出现了一系列的问题(权限方面), 最终放弃了samba, 选择了iSCSI.
环境
Ubuntu 18.04 LTS (服务端和客户端都是)
服务端
安装tgt
$ sudo apt install tgt
检查tgt服务的运行状态
$ sudo service tgt status
● tgt.service - (i)SCSI target daemon
Loaded: loaded (/lib/systemd/system/tgt.service; enabled; vendor preset: enab
Active: active (running) since Fri 2020-03-20 18:27:46 UTC; 51s ago
Docs: man:tgtd(8)
Main PID: 9517 (tgtd)
Status: "Starting event loop..."
Tasks: 1
CGroup: /system.slice/tgt.service
└─9517 /usr/sbin/tgtd -f
......
tgtadm --help可以查看tgt的命令参数
创建target
$ sudo tgtadm --lld iscsi --mode target --op new --tid 1 --targetname sss-storage-iscsi-1
- --lld iscsi 固定参数驱动iscsi
- --mode target 模式target
- --op new 操作new新创建
- --tid 1 target id号
- --targetname ...target名称
查看Target记录
$ sudo tgt-admin --show
Target 1: sss-storage-iscsi-1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: null
Backing store path: None
Backing store flags:
Account information:
ACL information:
注意最下面的ACL information, 下面没有任何内容, 应为还没配置允许访问的规则. 下面要进行配置.
绑定initiator name(允许访问的地址)
sudo tgtadm --lld iscsi --mode target --op bind --tid 1 -I ALL
或者
sudo tgtadm --lld iscsi --mode target --op bind --tid 1 -I 10.0.0.6
这里-I ALL表示所有地址均可访问, -I 10.0.0.6表示只有10.0.0.6可以访问. 想添加多个, 可以修改访问地址多执行几次.
再查看target记录
$ sudo tgt-admin --show
Target 1: sss-storage-iscsi-1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: null
Backing store path: None
Backing store flags:
Account information:
ACL information:
ALL
为Target新增逻辑单元
帮助文档中的命令规范为:
--lld --mode logicalunit --op new --tid --lun
--backing-store --bstype --bsopts --bsoflags
add a new logical unit with to the specific
target with . The logical unit is offered
to the initiators. must be block device files
(including LVM and RAID devices) or regular files.
bstype option is optional.
bsopts are specific to the bstype.
bsoflags supported options are sync and direct
(sync:direct for both).
--lld --mode logicalunit --op delete --tid --lun
delete the specific logical unit with that
the target with has.
实际运行
$ sudo tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 -b /dev/hdd_vgs/hdd_lv1
tid可以理解为target的id, lun可以理解成表示逻辑单元, 一个target下可以有多个逻辑单元.
再查看target记录
$ sudo tgtadm --lld iscsi --mode target --op show
Target 1: sss-storage-iscsi-1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 1000195 MB, Block size: 512
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: rdwr
Backing store path: /dev/hdd_vgs/hdd_lv1
Backing store flags:
Account information:
ACL information:
ALL
删除target逻辑单元
帮助文档中的命令规范为:
--lld --op delete --mode logicalunit --tid --lun
Delete specific logical unit with that the target with
has.
实际运行
sudo tgtadm --lld iscsi --op delete --mode logicalunit --tid 1 --lun 1
再查看target
$ sudo tgtadm --lld iscsi --mode target --op show
Target 1: sss-storage-iscsi-1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.1993-08.org.debian:01:802652a3a2f8 alias: sss-OptiPlex-3070
Connection: 0
IP Address: 10.0.0.6
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: null
Backing store path: None
Backing store flags:
Account information:
ACL information:
ALL
删除target
帮助文档中的命令规范为:
--lld --op delete --mode target --tid
Delete specific target with . The target must have no active
I_T nexus.
实际运行
sudo tgtadm --lld iscsi --op delete --mode target --tid 1
再查看记录
$ sudo tgt-admin show
No action specified.
target端(客户端)
安装open-iscsi
sudo apt install open-iscsi
这里Ubuntu 18.04 LTS自带了open-iscsi, 没有手动安装
发现并找出共享目标
安装完成后，对我们的iSCSI目标服务器运行目标发现以找出共享目标。
$ sudo iscsiadm -m discovery -t st -p 10.0.0.7
10.0.0.7:3260,1 sss-storage-iscsi-1
显示发现了10.0.0.7上的iscsi target, 接下来需要登录才能使用
连接target(登录)
sudo iscsiadm -m node --login
或
$ sudo iscsiadm --mode node --targetname sss-storage-iscsi-3070 --portal 10.0.0.7:3260 --login
Logging in to [iface: default, target: sss-storage-iscsi-3070, portal: 10.0.0.7,3260] (multiple)
Login to [iface: default, target: sss-storage-iscsi-3070, portal: 10.0.0.7,3260] successful.
注：target name为sss-storage-iscsi-3070，3260为iSCSI服务默认端口
这里可以运行如下命令, 检查新磁盘
dmesg | grep sd
[ 4.322384] sd 2:0:0:0: Attached scsi generic sg1 type 0
[ 4.322797] sd 2:0:0:0: [sda] 41943040 512-byte logical blocks: (21.4 GB/20.0 GiB)
[ 4.322843] sd 2:0:0:0: [sda] Write Protect is off
[ 4.322846] sd 2:0:0:0: [sda] Mode Sense: 03 00 00 00
[ 4.322896] sd 2:0:0:0: [sda] Cache data unavailable
[ 4.322899] sd 2:0:0:0: [sda] Assuming drive cache: write through
[ 4.323230] sd 2:0:0:0: [sda] Cache data unavailable
[ 4.323233] sd 2:0:0:0: [sda] Assuming drive cache: write through
[ 4.325312] sda: sda1 sda2 < sda5 >
[ 4.325729] sd 2:0:0:0: [sda] Cache data unavailable
[ 4.325732] sd 2:0:0:0: [sda] Assuming drive cache: write through
[ 4.325735] sd 2:0:0:0: [sda] Attached SCSI disk
[ 2486.941805] sd 4:0:0:3: Attached scsi generic sg3 type 0
[ 2486.952093] sd 4:0:0:3: [sdb] 1126400000 512-byte logical blocks: (576 GB/537 GiB)
[ 2486.954195] sd 4:0:0:3: [sdb] Write Protect is off
[ 2486.954200] sd 4:0:0:3: [sdb] Mode Sense: 8f 00 00 08
[ 2486.954692] sd 4:0:0:3: [sdb] Write cache: disabled, read cache: enabled, doesn't
support DPO or FUA
[ 2486.960577] sdb: sdb1
[ 2486.964862] sd 4:0:0:3: [sdb] Attached SCSI disk
输出中的sdb就是新的iscsi磁盘(这里省略了一堆其他输出).
断开Target(登出)
$ sudo iscsiadm -m node -p 192.168.1.120 --logout
Logging out of session [sid: 1, target: iqn.2014-0728.com:longtang, portal: 192.168.1.120,3260]
Logout of [sid: 1, target: iqn.2014-0728.com:longtang, portal: 192.168.1.120,3260] successful.
删除指定Target
用logout只是暂时登出，发现的target信息会保存在数据库中，下次重启iscsi服务时(service iscsi restart)，仍会找回该Target卷。
如果想从数据库中删除该Target，需用以下命令：
查询数据库中Target内容：
$ sudo iscsiadm -m node
10.0.0.7:3260,1 sss-storage-iscsi-3070
删除指定的Target：
$ sudo iscsiadm --mode node -o delete --targetname sss-storage-iscsi-3070 -p 10.0.0.7:3260
磁盘分区 & 挂载
创建一个主分区(具体解释看fdisk)
sudo fdisk /dev/sdb
n
p
enter
w
格式化成ext4
sudo mkfs.ext4 /dev/sdb1
挂载
sudo mount /dev/sdb1 /srv
配置开机自动挂载
$ sudo vim /etc/fstab
# 添加
/dev/sdb1 /srv ext4 defaults,auto,_netdev 0 0
配置重启自动连接
编辑配置文件/etc/iscsi/iscsid.conf，修改node.startup = automatic。若只通过IP验证，没有启用CHAP则不需要修改CHAP项。
然后重启服务/etc/init.d/open-iscsi restart。