CentOS7 Juno Cinder塊重啓後實例起不來 --rescan Exit code: 21

Cinder塊節點重啓後，在Dashboard上不能啓動附帶了雲硬盤（券）的實例，報錯：

Unexpected error while running command. Command: sudo nova-rootwrap /etc/nova/rootwrap.conf 
iscsiadm -m node -T iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78 -p block_node_IP:3260 --rescan 
Exit code: 21 Stdout: u'' Stderr: u'iscsia].

錯誤代碼21表示：ISCSI_ERR_NO_OBJS_FOUND - no records/targets/sessions/portals found to execute operation on，找不到目標對象。而在實例關機狀態下，不能卸載掛載的卷。

一、計算節點

# tail /var/log/nova/nova-compute.log -n 500 | grep iscsi /*沒有發現會話*/

Unexpected error while running command.
Command: sudo nova-rootwrap /etc/nova/rootwrap.conf 
iscsiadm -m node -T iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78 -p block_node_IP:3260 --rescan
Exit code: 21
Stdout: u''
Stderr: u'iscsiadm: No session found.
<pre name="code" class="html"><pre name="code" class="html">......

# tail -n 50 /var/log/messages | grep auth /*登陸拒絕*/

Jan 25 14:53:43 compute3 iscsid: conn 0 login rejected: initiator failed authorization with target
Jan 25 14:57:29 compute3 iscsid: conn 0 login rejected: initiator failed authorization with target
Jan 25 16:06:40 compute3 iscsid: conn 0 login rejected: initiator failed authorization with target
Jan 25 17:10:51 compute3 iscsid: conn 0 login rejected: initiator failed authorization with target
Jan 25 17:17:37 compute3 iscsid: conn 0 login rejected: initiator failed authorization with target
Jan 25 17:41:02 compute3 iscsiadm: iscsiadm: initiator reported error (24 - iSCSI login failed due to authorization failure)
Jan 25 17:41:02 compute3 iscsiadm: iscsiadm: initiator reported error (24 - iSCSI login failed due to authorization failure)
Jan 25 17:41:03 compute3 iscsid: conn 0 login rejected: initiator failed authorization with target
Jan 25 17:41:03 compute3 iscsid: conn 0 login rejected: initiator failed authorization with target

# systemctl status iscsid -l /*認證失敗*/

1月 25 17:17:37 compute3 iscsid[1730]: conn 0 login rejected: initiator failed authorization with target
1月 25 17:17:37 compute3 iscsid[1730]: Connection63:0 to 
[target: iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78, portal: block_node_IP,3260] 
through [iface: default] is shutdown.
......

其中：

1. iqn.2010-10.org.openstack是塊節點的iscsi的target標示
2. volume-369865bb-0714-4ab2-a96c-7a91b7483e78是塊節點上爲實例創建的卷名（lvdisplay可以看到）

# iscsiadm -m node -T iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78 -p block_node_IP:3260 --login /*手工登陸驗證*/

Logging in to [iface: default, target: iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78, 
portal: block_node_IP,3260] (multiple)
iscsiadm: Could not login to [iface: default, 
target: iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78, portal: block_node_IP,3260].
iscsiadm: initiator reported error (24 - iSCSI login failed due to authorization failure)
iscsiadm: Could not log into all portals

二、塊節點

# tail -n 1000 /var/log/messages | grep auth /*系統日誌*/

Jan 25 17:10:50 block1 kernel: iSCSI Initiator Node: iqn.1994-05.com.redhat:a5fd80c5a912 is not authorized to access iSCSI target portal group: 1.
Jan 25 17:17:37 block1 kernel: iSCSI Initiator Node: iqn.1994-05.com.redhat:a5fd80c5a912 is not authorized to access iSCSI target portal group: 1.
Jan 25 17:41:02 block1 kernel: iSCSI Initiator Node: iqn.1994-05.com.redhat:a5fd80c5a912 is not authorized to access iSCSI target portal group: 1.
Jan 25 17:41:02 block1 kernel: iSCSI Initiator Node: iqn.1994-05.com.redhat:a5fd80c5a912 is not authorized to access iSCSI target portal group: 1.

其中：

1. iqn.1994-05.com.redhat:a5fd80c5a912是實例所在<strong>計算節點</strong>的iscsi名字，可以在計算節點上查看
    $ cat /etc/iscsi/initiatorname.iscsi
    InitiatorName=iqn.1994-05.com.redhat:a5fd80c5a912

看到這裏就是表明：實例所在的計算節點不能成功認證去連接塊節點的卷。

$ targetcli ls /*塊節點上查看target，這裏我有兩個卷，分別500G*/

爲了驗證這些卷最初建立和掛載到實例上時的狀態，這裏新建一個卷並掛載到另一個位於不同計算節點(iqn.1994-05.com.redhat:11f29647866a)的實例上，截圖

/> cd iscsi/

/iscsi> ls /*只看iscsi列表，方便看*/

發現新卷有兩個地方不同：

1. 有acls(訪控列表)，指定誰能訪問這個卷，圖中看指明瞭是上面測試用的另一個實例所在的計算節點

2. 下面還有個mapped_lun0，mapping在於指定能訪問誰，也就是上面acls中的主機能夠訪問誰（對應的還有個masking指定不能訪問誰）

類似地，現在對之前的兩個卷，作同樣的更改

# targetcli

/> cd iscsi/iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78/tpg1/acls/ /*轉到對應的卷的acls中*/

/iscsi/iqn.20...e78/tpg1/acls> create iqn.1994-05.com.redhat:a5fd80c5a912 /*指定實例所在計算節點可以訪問*/

Created Node ACL for iqn.1994-05.com.redhat:a5fd80c5a912
Created mapped LUN 0.

/iscsi/iqn.20...e78/tpg1/acls> ls

o- acls .................................................................................................................. [ACLs: 1]
  o- iqn.1994-05.com.redhat:a5fd80c5a912 .............................................................. [1-way auth, Mapped LUNs: 1]
    o- mapped_lun0 ......................... [lun0 block/iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78 (rw)]

OK，上面說的兩個東西都有了。對另一個卷作同樣處理。

o- acls .................................................................................................................. [ACLs: 1]
  o- iqn.1994-05.com.redhat:a5fd80c5a912 .............................................................. [1-way auth, Mapped LUNs: 1]
    o- mapped_lun0 ......................... [lun0 block/iqn.2010-10.org.openstack:volume-446d70fc-c3f8-43cd-a0b9-dfd5eee934b9 (rw)]

/iscsi/iqn.20...4b9/tpg1/acls> exit

Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json

# targetcli saveconfig /*再保存下*/

Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json

# systemctl restart target /*重啓target服務*/

硬重啓實例（步驟看文章底部的控制節點），還是同樣報錯，並且在塊節點上發現：

# tail /var/log/messages

Jan 26 11:06:00 block1 cinder-volume: 2016-01-26 11:06:00.356 2785 INFO cinder.volume.manager [-] Updating volume replication status.
Jan 26 11:06:08 block1 kernel: CHAP user or password not set for Initiator ACL
Jan 26 11:06:08 block1 kernel: Security negotiation failed.
Jan 26 11:06:08 block1 kernel: iSCSI Login negotiation failed.

# vim /etc/iscsi/iscsid.conf /*查看計算節點上的配置，默認就沒有設置用戶名和密碼*/

# *************
# CHAP Settings
# *************

# To enable CHAP authentication set node.session.auth.authmethod
# to CHAP. The default is None.
#node.session.auth.authmethod = CHAP

# To set a CHAP username and password for initiator
# authentication by the target(s), uncomment the following lines:
#node.session.auth.username = username
#node.session.auth.password = password

vim /etc/target/saveconfig.json /*回到塊節點，發現新建測試卷有用戶名和密碼，之前的卷在塊節點主機重啓後卻沒有*/

"dev": "/dev/cinder-volumes/volume-01519b87-3036-4b6e-8174-c4a86030b370",
      "name": "iqn.2010-10.org.openstack:volume-01519b87-3036-4b6e-8174-c4a86030b370",
      "plugin": "block",
      "readonly": false,
/password
            "login_timeout": 15,
            "netif_timeout": 2,
            "prod_mode_write_protect": 0,
            "t10_pi": 0
          },
          "enable": true,
          "luns": [
            {
              "index": 0,
              "storage_object": "/backstores/block/iqn.2010-10.org.openstack:volume-01519b87-3036-4b6e-8174-c4a86030b370"
            }
          ],
          "node_acls": [
            {
              "attributes": {
                "dataout_timeout": 3,
                "dataout_timeout_retries": 5,
                "default_erl": 0,
                "nopin_response_timeout": 30,
                "nopin_timeout": 15,
                "random_datain_pdu_offsets": 0,
                "random_datain_seq_offsets": 0,
                "random_r2t_offsets": 0
              },
              "chap_password": "5k4DnHHcJd3SyvaF",
              "chap_userid": "xZrcAF8GH5P6smJmYceN",
              "mapped_luns": [
                {
                  "index": 0,
                  "tpg_lun": 0,
                  "write_protect": false
                }
              ],
              "node_wwn": "iqn.1994-05.com.redhat:11f29647866a"
            }
          ],

# reboot /*驗證塊節點重啓後，新建卷沒有變化，還是能正常識別使用：acls有；默認的用戶名和密碼也都在配置文件中，那麼這個問題沒有重現*/

最後，既然是認證失敗，那麼我就在塊節點上設置這兩個卷的用戶名和密碼，然後在對應計算節點上去配置對應的帳號

/> cd iscsi/iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78/tpg1/acls/iqn.1994-05.com.redhat:a5fd80c5a912/

/iscsi/iqn.20...:a5fd80c5a912> set auth userid=username

Parameter userid is now 'username'.

/iscsi/iqn.20...:a5fd80c5a912> set auth password=password

Parameter password is now 'password'.

/iscsi/iqn.20...:a5fd80c5a912> exit /*另一個卷同樣設置*/

Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json

# systemctl restart target
# ss -napt | grep 3260

LISTEN     0      256          *:3260                     *:*

# vim /etc/iscsi/iscsid.conf /*然後在計算節點去配置iscsid.conf，去掉註釋開啓CHAP*/

# *************
# CHAP Settings
# *************

# To enable CHAP authentication set node.session.auth.authmethod
# to CHAP. The default is None.
node.session.auth.authmethod = CHAP

# To set a CHAP username and password for initiator
# authentication by the target(s), uncomment the following lines:
node.session.auth.username = username
node.session.auth.password = password

# iscsiadm -m discovery -t sendtargets -p block_node_IP /*計算節點上再手工連接驗證*/

# iscsiadm -m node -l

Login to [iface: default, target: iqn.2010-10.org.openstack:volume-446d70fc-c3f8-43cd-a0b9-dfd5eee934b9, portal: block_node_IP,3260] successful.
Login to [iface: default, target: iqn.2010-10.org.openstack:volume-369865bb-0714-4ab2-a96c-7a91b7483e78, portal: block_node_IP,3260] successful.

最後再硬重啓實例，起來了。但是呢這裏會有個潛在問題，以後這個計算節點上的其他實例需要掛載卷的時候，可能就需要對捲進行同樣的用戶名和密碼設置。而如果匿名不需要認證，那就不太安全。

三、控制節點

在Dashboard上硬啓動啓動失敗的實例，直接進入了error狀態，需要reset-state重置狀態再hard reboot

# nova list /*獲取實例ID*/

# nova reset-state 2d6fc5be-a95e-4959-a16a-45f126b0217a --active /*重置爲active活動狀態*/

現在到Dashboard上硬重啓實例。

CentOS7 Juno Cinder塊重啓後實例起不來 --rescan Exit code: 21

一、計算節點

二、塊節點

三、控制節點

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CentOS7 Juno Cinder塊重啓後 實例起不來 --rescan Exit code: 21

一、計算節點

二、塊節點

三、控制節點

CentOS7 Juno Cinder塊重啓後實例起不來 --rescan Exit code: 21