linux環境掃描不出iSCSI共享資源怎么辦

配置環境信息：
Redhat7  target：192.168.23.10
Redhat7  initiator：192.168.23.20
Windows10 initiator：192.168.23.1

問題：在192.168.23.20客戶端掃描服務端，沒有發現資源。

第一步：檢查網絡連通性，網絡正常。

第二步：檢查initiator文件中寫入的客戶端名稱與target目錄中acls的參數一致
[root@client Desktop]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.3c9133ae8aee:client

o- iscsi ............................................................................................................ [Targets: 1]
| o- iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.3c9133ae8aee ....................................................... [TPGs: 1]
|   o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
|     o- acls .......................................................................................................... [ACLs: 1]
|     | o- iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.3c9133ae8aee:client ................................... [Mapped LUNs: 1]

檢查結果表示一致！

第三步：檢查initiator的服務狀態
[root@client Desktop]# systemctl restart iscsid
[root@client Desktop]# systemctl status iscsid
iscsid.service - Open-iSCSI
Loaded: loaded (/usr/lib/systemd/system/iscsid.service; enabled)
Active: active (running) since Fri 2020-02-07 08:42:17 EST; 10s ago
Docs: man:iscsid(8)
man:iscsiadm(8)
Process: 3950 ExecStop=/sbin/iscsiadm -k 0 2 (code=exited, status=0/SUCCESS)
Process: 3955 ExecStart=/usr/sbin/iscsid (code=exited, status=0/SUCCESS)
Main PID: 3957 (iscsid)
CGroup: /system.slice/iscsid.service
├─3956 /usr/sbin/iscsid
└─3957 /usr/sbin/iscsid

Feb 07 08:42:17 client systemd[1]: Starting Open-iSCSI...
Feb 07 08:42:17 client systemd[1]: Failed to read PID from file /var/run/iscsid.pid: Invali...ment
Feb 07 08:42:17 client iscsid[3956]: iSCSI daemon with pid=3957 started!
Feb 07 08:42:17 client systemd[1]: Started Open-iSCSI.
Hint: Some lines were ellipsized, use -l to show in full.

檢查結果表示，運行正常！

第四步：檢查target的服務狀態
[root@localhost Desktop]# systemctl status targetd
targetd.service - targetd storage array API daemon
Loaded: loaded (/usr/lib/systemd/system/targetd.service; enabled)
Active: failed (Result: exit-code) since Fri 2020-02-07 07:45:27 EST; 11s ago
Process: 3597 ExecStart=/usr/bin/targetd (code=exited, status=255)
Main PID: 3597 (code=exited, status=255)

Feb 07 07:45:27 localhost.localdomain systemd[1]: Starting targetd storage array API daemon...
Feb 07 07:45:27 localhost.localdomain systemd[1]: Started targetd storage array API daemon.
Feb 07 07:45:27 localhost.localdomain targetd[3597]: CRITICAL:root:password not set in /etc/target/targetd.yaml
Feb 07 07:45:27 localhost.localdomain systemd[1]: targetd.service: main process exited, code=exited, status=255/n/a
Feb 07 07:45:27 localhost.localdomain systemd[1]: Unit targetd.service entered failed state.

iSCSI服務運行有報錯，“ CRITICAL:root:password not set in /etc/target/targetd.yaml”。
查看該文件/etc/target/targetd.yaml，網上搜索該文件的相關配置文檔，未果，后續待補充。
自我嘗試配，未果。

此時，依據現有信息無法判斷我的iSCSI target是否配置正常。
但是按照網絡一個文檔提示，該報錯并不影響服務正常使用，initiator依然可以發現target。

第五步：在Windows 客戶都嘗試掃描 iSCSI共享資源，未果，沒有搜索到。

此時，基本可以判斷我的iSCSI target配置有問題，列出target所有目錄進行檢查。
[root@localhost Desktop]# 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: 1]
| | o- desk0 ........................................................................... [/dev/md0 (40.0GiB) write-thru activated]
| o- fileio ................................................................................................. [Storage Objects: 0]
| o- pscsi .................................................................................................. [Storage Objects: 0]
| o- ramdisk ................................................................................................ [Storage Objects: 0]
o- iscsi ............................................................................................................ [Targets: 1]
| o- iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.3c9133ae8aee ....................................................... [TPGs: 1]
|   o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
|     o- acls .......................................................................................................... [ACLs: 1]
|     | o- iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.3c9133ae8aee:client ................................... [Mapped LUNs: 1]
|     |   o- mapped_lun0 ................................................................................. [lun0 block/desk0 (rw)]
|     o- luns .......................................................................................................... [LUNs: 1]
|     | o- lun0 ......................................................................................... [block/desk0 (/dev/md0)]
|     o- portals .................................................................................................... [Portals: 1]
|       o- 192.168.23.20:3260 ............................................................................................... [OK]
o- loopback ......................................................................................................... [Targets: 0]

逐行檢查，問題發現了，提供訪問共享資源的網卡地址寫錯了，正確的應該是192.168.23.10。

第六步：修改正確的TCP/IP地址。
通過help可得刪除命令。
/iscsi/iqn.20.../tpg1/portals> help

刪除錯誤的TCP/IP信息：
/iscsi/iqn.20.../tpg1/portals> delete 192.168.23.20 3260
Deleted network portal 192.168.23.20:3260
添加正確的TCP/IP信息：
/iscsi/iqn.20.../tpg1/portals> create 192.168.23.10
Using default IP port 3260
Created network portal 192.168.23.10:3260.

重啟服務，initiator再次嘗試掃描。
[root@client Desktop]# iscsiadm -m discovery -t sendtargets -p 192.168.23.10
192.168.23.10:3260,1 iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.3c9133ae8aee

總結，targetd.yaml關于root password的保存不影響iSCSI服務的正常運行。