reboot hangs with "Reached target shutdown", who can help me?

[can zhu]

os version:

CentOS Linux release 7.4.1708 (Core)

kernel version: 

3.10.0-693.el7.x86_64

systemd version:

systemd-219-42.el7.x86_64

Mount iscsi devices on the node(iscsi client node) and reboot os, hangs:

[Ulrich Windl]

Hi!

I think the problem is more related to systemd, rather than iscsi.
Personally I hate systemd, but you don't wnat to know that...

Regards,
Ulrich

>>> can zhu <zhuca...@gmail.com> schrieb am 10.12.2019 um 15:25 in Nachricht
<372db1a3-424d-4063...@googlegroups.com>:

> os version:
>
> CentOS Linux release 7.4.1708 (Core)
>
> kernel version:
>
> 3.10.0-693.el7.x86_64
>
>
> systemd version:
>

> *systemd*-219-42.el7.x86_64

>
>
> Mount iscsi devices on the node(iscsi client node) and reboot os, hangs:
>
> [image: WechatIMG2178.png]
>
>
>
>

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> df0b%40googlegroups.com.

[can zhu]

Have you encountered such a problem? Could you give me some suggestions?

Ulrich Windl <Ulrich...@rz.uni-regensburg.de> 于2019年12月10日周二 下午10:31写道：

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[The Lee-Man]

On Tuesday, December 10, 2019 at 6:25:00 AM UTC-8, can zhu wrote:

os version:

CentOS Linux release 7.4.1708 (Core)

kernel version: 

3.10.0-693.el7.x86_64

systemd version:

systemd-219-42.el7.x86_64

Mount iscsi devices on the node(iscsi client node) and reboot os, hangs:

...

Hello:

Such issue are common if the proper sequencing is not followed when shutting down iSCSI connections.

One has to (in order):

• if iscsi devices are being used, stop using them. That generally means unmounting any filesystems that use the devices.
• logout of the iSCSI connection, i.e. end the iscsi session cleanly
• stop the iscsi daemon
• now the network can be shutdown

And this of course assumes your target(s) are on other systems that are not being shut down.

As mentioned by Ulrich, this sequencing is now handled by systemd on most Linux systems. And the way in which this is handled is that these different layers are handled by different services. For example, on SUSE, the daemon is controlled by iscsid.socket and iscsid.service, and the login/logout is handled by iscsi.service.

I do not have a CentOS 7 system, but I'm downloading CentOS 8 to see how RH has set up the iSCSI services there.

But, at a low level, you must have the "startup" value set to "automatic" for targets to be disconnected automatically at shutdown time. So you should be able to run:

> zsh> sudo iscsiadm -m node --op show | fgrep startup

to see the startup value.

[The Lee-Man]

Okay, I checked CentOS 8, and the services seem very similar to what I'm familiar with.

You do indeed need to make sure your nodes have startup set to automatic.

Use something like:

> zsh> sudo iscsiadm -m node --op update --name 'node.conn[0].startup' --value automatic

to update all nodes to start and stop automatically, and update startup in /etc/iscsi/iscsid.conf to change the default.

[can zhu]

@The Lee-Man  Thanks, In my environment， the default value of the node.startup is automatic in config

The Lee-Man <leeman...@gmail.com> 于2019年12月13日周五 上午5:17写道：

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[Robert ECEO Townley]

If you enter the mount command at this point, what mount points are still mounted?   Screenshot has some contradictions.

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