openEuler创建iSCSI服务

iSCSI（Internet Small Computer System Interface，发音为/ˈаɪskʌzi/，Internet小型计算机系统接口），又称为IP-SAN，是一种基于因特网及SCSI-3协议下的存储技术，由IETF提出，并于2003年2月11日成为正式的标准。

与传统的SCSI技术比较起来，iSCSI技术有以下三个革命性的变化：

把原来只用于本机的SCSI协议透过TCP/IP网络发送，使连接距离可作无限的地域延伸；
连接的服务器数量无限（原来的SCSI-3的上限是15）；
由于是服务器架构，因此也可以实现在线扩容以至动态部署。
iSCSI是由IBM发明的基于以太网的存储协议，该协议与SUN的NFS协议都是为了解决存储资源共享问题的解决方案。两者意图一致，只不过两者是不同的实现方式，前者在客户机上呈现的是一个块设备，而后者则是一个目录树。在前面已经在CentOS实现nft和cifs共享案例，所以这次，我们尝试使用openEuler来部署iSCSI服务。

iSCSI架构及搭建

iSCSI架构大概如下所示：

+----------------------+                               +----------------------+
| [   iSCSI Target   ] |192.168.31.150 | 192.168.31.165| [ iSCSI Initiator  ] |
|   server.ywmy.xyz    +---------------+---------------+   client.ywmy.xyz    |
|                      |                               |                      |
+----------------------+                               +----------------------+

我们需要两台电脑，一台做为服务器，上面挂载磁盘，部署iSCSI Target，另外一台作为iSCSI Initiator，挂载来自服务端共享的磁盘。

服务端配置

搭建的目的，通过iSCSI实现把服务器的磁盘块，和文件映射为电脑的本地磁盘。所以我们需要给服务器添加一块磁盘，10GB大小，用于部署需求。

以磁盘形式添加
目前系统的磁盘结构如下：

[root@ha1 ~]# lsblk
NAME               MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda                  8:0    0  20G  0 disk
├─sda1               8:1    0   1M  0 part
├─sda2               8:2    0   1G  0 part /boot
└─sda3               8:3    0  19G  0 part
  ├─openeuler-root 253:0    0  17G  0 lvm  /
  └─openeuler-swap 253:1    0   2G  0 lvm  [SWAP]
sdb                  8:16   0  10G  0 disk

添加的sdb即为准备分配给客户端的磁盘。

以文件形式添加

我们使用命令在/opt目录下生成镜像文件，大小一GB，

1	`dd if=/dev/zero of=/opt/disk.img bs=1024k count=1024`

target安装

安装target
openEuler和CentOS一样，我们直接从源里安装target即可。

yum install targetcli
systemctl start target 
systemctl enable target
systemctl status target
● target.service - Restore LIO kernel target configuration
     Loaded: loaded (/usr/lib/systemd/system/target.service; enabled; preset: disabled)
     Active: active (exited) since Tue 2025-01-07 11:54:44 CST; 2h 1min ago
    Process: 900 ExecStart=/usr/bin/targetctl restore (code=exited, status=0/SUCCESS)
   Main PID: 900 (code=exited, status=0/SUCCESS)

1月 07 11:54:42 ha1 systemd[1]: Starting Restore LIO kernel target configuration...
1月 07 11:54:44 ha1 systemd[1]: Finished Restore LIO kernel target configuration.

防火墙放通iSCSI服务端口

1 2	`firewall-cmd --permanent --add-port=3260/tcp firewall-cmd --complete-reload`

target配置

输入targetcli进入配置。

[root@ha1 ~]# targetcli
targetcli shell version 2.1.56
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/> ls
o- / .................................................................................................................... [...]
  o- backstores ......................................................................................................... [...]
  | o- block ............................................................................................. [Storage Objects: 1]
  | o- fileio ............................................................................................ [Storage Objects: 1]
  | o- pscsi ............................................................................................. [Storage Objects: 0]
  | o- ramdisk ........................................................................................... [Storage Objects: 0]
  o- iscsi ....................................................................................................... [Targets: 1]
  o- loopback .................................................................................................... [Targets: 0]
  o- vhost ....................................................................................................... [Targets: 0]
  o- xen-pvscsi .................................................................................................. [Targets: 0]
/>

通过targetcli调用，配置iSCSI。输入ls我们可以看到iSCSI初始状态，backstores下有四个节点：

block
fileio
pscsi
ramdis

实例需要使用block和fileio节点。创建block磁盘和fileio磁盘了。iscsi节点，需要创建服务端的配置和客户端的配置，以及客户端的认证。总体操作思路如下：

创建iSCSI磁盘
创建服务端程序配置
创建服务卷
创建客户端连接配置（启用CHAP认证）
重启target服务

# 使用create 命令创建名为idisk1 的硬盘。

/> cd /backstores/block/ 
/> /backstores/block/ create idisk1 /dev/sdb
created block storage idisk1 using /dev/sdb.

# 可以看到block节点下已经生成了sdb的配置。

/> ls
o- / .................................................................................................................... [...]
  o- backstores ......................................................................................................... [...]
  | o- block ............................................................................................. [Storage Objects: 1]
  | | o- idisk1 ..................................................................... [/dev/sdb (10.0GiB) write-thru activated]
  | |   o- alua .............................................................................................. [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................................................. [ALUA state: Active/optimized]

# 使用create 命令创建名为idisk2 的硬盘。

/> cd /blockstores/fileio/
/> /backstores/fileio/ create idisk2 /opt/disk.img
created idisk2 with 8388608.
# 通过ls可以看到创建的idisk2硬盘。
/> ls
o- / .................................................................................................................... [...]
  o- backstores ......................................................................................................... [...]
  | o- block ............................................................................................. [Storage Objects: 1]
  | | o- idisk1 ..................................................................... [/dev/sdb (10.0GiB) write-thru activated]
  | |   o- alua .............................................................................................. [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................................................. [ALUA state: Active/optimized]
  | o- fileio ............................................................................................ [Storage Objects: 1]
  | | o- idisk2 ................................................................. [/opt/disk.img (1.0GiB) write-back activated]
  | |   o- alua .............................................................................................. [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................................................. [ALUA state: Active/optimized]

# 创建服务端，在iscsi节点创建。

/> cd /iscsi 
/> /iscsi/ create iqn.2025-01.ywmy.xyz:server
Created target iqn.2025-01.ywmy.xyz:server.
Created TPG 1.
Global pref auto_add_default_protal=true
Created default portal listening IPs (0.0.0.0), port 3260.

# 通过ls命令查看iscsi节点生成的服务端配置

/> ls
o- / .................................................................................................................... [...]
  o- backstores ......................................................................................................... [...]
  | o- block ............................................................................................. [Storage Objects: 1]
  | | o- idisk1 ..................................................................... [/dev/sdb (10.0GiB) write-thru activated]
  | |   o- alua .............................................................................................. [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................................................. [ALUA state: Active/optimized]
  | o- fileio ............................................................................................ [Storage Objects: 1]
  | | o- idisk2 ................................................................. [/opt/disk.img (1.0GiB) write-back activated]
  | |   o- alua .............................................................................................. [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................................................. [ALUA state: Active/optimized]
  | o- pscsi ............................................................................................. [Storage Objects: 0]
  | o- ramdisk ........................................................................................... [Storage Objects: 0]
  o- iscsi ....................................................................................................... [Targets: 1]
  | o- iqn.2025-01.ywmy.xyz:server .................................................................................. [TPGs: 1]
  |   o- tpg1 .......................................................................................... [no-gen-acls, no-auth]
  |     o- acls ..................................................................................................... [ACLs: 0]
  |     o- luns ..................................................................................................... [LUNs: 2]
  |     o- portals ............................................................................................... [Portals: 0]
  |       o- 0.0.0.0:3260 ................................................................................................ [OK]

# 可以看到tpg1节点下生成了acls,luns,ports目录。我们需要在luns中创建服务卷。

/> cd /iscsi/iqn.2025-01.ywmy.xyz:server/tgp1/luns> create /backstores/block/idisk1 
Created LUN 0.
/> cd /iscsi/iqn.2025-01.ywmy.xyz:server/tgp1/luns> create /backstores/fileio/idisk2 
Created LUN 1.

# 创建客户端发起程序配置，启用chap认证。

/> cd /iscsi/iqn.2025-01.ywmy.xyz:server/tpg1/acls
/> /iscsi/iqn.2025-01.ywmy.xyz:server/tpg1/acls> create iqn.2025-01.ywmy.xyz:client
Created node ACL for iqn.2025-01.ywmy.xyz:client
Created mapped LUN 1.
Created mapped LUN 0.
/> cd/iscsi/iqn.2025-01.ywmy.xyz:server/tpg1/acls> cd iqn.2025-01.ywmy.xyz:client 
/> /iscsi/iqn.2025-01.ywmy.xyz:server/tg1/acls/iqn.2025-01.ywmy.xyz:client> set auth userid yourname  
/> /iscsi/iqn.2025-01.ywmy.xyz:server/tg1/acls/iqn.2025-01.ywmy.xyz:client> set auth password=your_password

# 到这里，已经全部设置完成，可以进入根目录，查看配置

/> ls
o- / .................................................................................................................... [...]
  o- backstores ......................................................................................................... [...]
  | o- block ............................................................................................. [Storage Objects: 1]
  | | o- idisk1 ..................................................................... [/dev/sdb (10.0GiB) write-thru activated]
  | |   o- alua .............................................................................................. [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................................................. [ALUA state: Active/optimized]
  | o- fileio ............................................................................................ [Storage Objects: 1]
  | | o- idisk2 ................................................................. [/opt/disk.img (1.0GiB) write-back activated]
  | |   o- alua .............................................................................................. [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................................................. [ALUA state: Active/optimized]
  | o- pscsi ............................................................................................. [Storage Objects: 0]
  | o- ramdisk ........................................................................................... [Storage Objects: 0]
  o- iscsi ....................................................................................................... [Targets: 1]
  | o- iqn.2025-01.ywmy.xyz:server .................................................................................. [TPGs: 1]
  |   o- tpg1 .......................................................................................... [no-gen-acls, no-auth]
  |     o- acls ..................................................................................................... [ACLs: 1]
  |     | o- iqn.2025-01.ywmy.xyz:client ..................................................................... [Mapped LUNs: 2]
  |     |   o- mapped_lun0 ........................................................................... [lun0 block/idisk1 (rw)]
  |     |   o- mapped_lun1 .......................................................................... [lun1 fileio/idisk2 (rw)]
  |     o- luns ..................................................................................................... [LUNs: 2]
  |     | o- lun0 ................................................................ [block/idisk1 (/dev/sdb) (default_tg_pt_gp)]
  |     | o- lun1 .......................................................... [fileio/idisk2 (/opt/disk.img) (default_tg_pt_gp)]
  |     o- portals ............................................................................................... [Portals: 1]
  |       o- 0.0.0.0:3260 ................................................................................................ [OK]
  o- loopback .................................................................................................... [Targets: 0]
  o- vhost ....................................................................................................... [Targets: 0]
  o- xen-pvscsi .................................................................................................. [Targets: 0]
/> exit
Global pref auto_save_on_exit=true
Configuration saved to /etc/target/saveconfig.json

使用exit命令退出targetcli，配置文件自动保存。

客户端配置

客户端使用iscsi-initiator-utils。我们仍然使用openEuler环境作为客户端。

iscsi-initiator-utils 安装

通过yum直接从源里安装。

1	`yum install iscsi-initiator-utils`

在openEuler中安装iscsi-initiator-utils，安装完成后，启动iscsd服务，一直报错，无法启动服务，卸载之后，重新安装也报错。查看日志发现一些问题。

Jan  7 12:26:59 ha2 systemctl[8751]: [systemctl start iscsid] called by PID 8660 (-bash)
Jan  7 12:26:59 ha2 systemd[1]: Starting Open-iSCSI...
Jan  7 12:26:59 ha2 iscsid[8753]: /sbin/iscsid: error while loading shared libraries: /lib64/libisns.so.0: file too short
Jan  7 12:26:59 ha2 systemd[1]: iscsid.service: Main process exited, code=exited, status=127/n/a
Jan  7 12:26:59 ha2 systemd[1]: iscsid.service: Failed with result 'exit-code'.
Jan  7 12:26:59 ha2 systemd[1]: Failed to start Open-iSCSI.

可以看到启动有依赖报错。iscsi-initiator-utils，这个程序包在ubuntu下，直接安装为open-iscsi。libisns.so.0，我猜想也是依赖问题，找到程序目录，发下文件为空。所以，尝试单独安装依赖。

1
2
3

yum install open-isns
yum install open-iscsi
yum install iscsi-initiator-utils

配置客户端程序

安装iscsi-initiator-utils程序后，在/etc/iscsi/目录下生成配置文件。我们需要编辑initiatorname.iscsi。写入服务器配置的连接器名称。

1
2
3

vim initiatorname.iscsi
# InitiatorName=iqn.2012-01.com.openeuler:456d2c5a9d79
InitiatorName=iqn.2025-01.ywmy.xyz:client

配置认证，我们需要配置iscsid.conf文件。

node.startup = manual

node.session.auth.username = username
node.session.auth.password = password

启动客户端程序

客户端查找服务端程序：

1 2	`iscsiadm -m discovery -t st -p 192.168.31.150 192.168.31.150:3260,1 iqn.2025-01.ywmy.xyz:server`

客户端连接iSCSI服务端：

systemctl status iscsid
● iscsid.service - Open-iSCSI
     Loaded: loaded (/usr/lib/systemd/system/iscsid.service; disabled; preset: disabled)
     Active: active (running) since Tue 2025-01-07 13:00:11 CST; 4s ago
TriggeredBy: × iscsid.socket
       Docs: man:iscsid(8)
             man:iscsiadm(8)
   Main PID: 10769 (iscsid)
     Status: "Ready to process requests"
      Tasks: 1 (limit: 9104)
     Memory: 1.8M ()
     CGroup: /system.slice/iscsid.service
             └─10769 /sbin/iscsid -f

1月 07 13:00:11 ha2 systemd[1]: Starting Open-iSCSI...
1月 07 13:00:11 ha2 systemd[1]: Started Open-iSCSI.

启动服务后，连接iSCSI服务。

iscsiadm -m node -T iqn.2025-01.ywmy.xyz:server -p 192.168.31.150 --login
Logging in to [iface: default, target: iqn.2025-01.ywmy.xyz:server, portal: 192.168.31.150,3260]
Login to [iface: default, target: iqn.2025-01.ywmy.xyz:server, portal: 192.168.31.150,3260] successful.

# 查看系统文件结构

lsblk
NAME               MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda                  8:0    0  20G  0 disk
├─sda1               8:1    0   1M  0 part
├─sda2               8:2    0   1G  0 part /boot
└─sda3               8:3    0  19G  0 part
  ├─openeuler-root 253:0    0  17G  0 lvm  /
  └─openeuler-swap 253:1    0   2G  0 lvm  [SWAP]
sdb                  8:16   0  10G  0 disk
sdc                  8:32   0   1G  0 disk

我们已经看到了远程挂载的磁盘，sdb和sdc已经有了。linux端的配置和验证结束。

linux

#openEuler #iSCSI #target #iscsi-initiator-utils

openEuler创建iSCSI服务

https://ywmy.xyz/2025/01/07/openEuler创建iSCSI服务/

作者

ian

发布于

2025年1月7日

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