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Debian as iSCSI initiator on boot

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Premise: This is a cross-post from serverfault where this question has 
non received any answer.

https://serverfault.com/questions/1168219/debian-as-iscsi-initiator-on-boot

I have a Debian GNU/Linux 12 virtual machine (amd64) that should mount 
this iSCSI volume on boot.

Following this guide [1] the iscsiadm command did everything it was 
supposed to do and I was able to manually mount the volume. However the

iscsiadm  --mode node  --targetname "..." --portal "...:3260"

command placed the initiator configuration files under

/var/lib/iscsi/...

and not under /etc/iscsi. I'm not sure that's the problem, but on reboot 
the server did not initiate the iSCSI connection and it did not mount 
the volume.

I then copied /var/lib/iscsi/* to /etc/iscsi/ and it started working on 
boot too. For a while. Today it stopped after a reboot without any 
obvious reason (not obvious to me at least).

Using apt I noticed there was an open-iscsi update available from sid 
(version 2.1.10-2 while I had 2.1.10-1 installed) and I tried to install 
that, which resumed my iSCSI connection without editing anything. 
However the changelog for that new version states it only adds support 
for the riscv64 arch, which I do not have.

Upon inspecting the situation, I see that the /var/lib/iscsi/nodes 
directory was touched during the package upgrade (I don't understand 
why), while the /etc/iscsi/nodes directory was not (I do understand 
why). However the contents of both directories were still the same 
(rsync -rcnv /var/lib/iscsi/nodes/ /etc/iscsi/nodes/ showed nothing to 
sync).

Rebooting the server once again, the iSCSI connection did resume 
correctly, but I'm not sure I can trust this situation. Looking for 
errors around the time it failed before, using journalctl | grep -i 
iscsi, does not bring up any error messages except:

nov 27 10:46:32 adh systemd[1]: iscsid.service: Failed to parse PID from 
file /run/iscsid.pid: Invalid argument

which is followed by a correct initiator startup anyway (at least from 
the logs point of view, but in reality it was not working).

Is manually copying the contents of /var/lib/iscsi directory under 
/etc/iscsi/ the correct, though undocumented, way to go? Or is there 
anything else/different to do in order to make the system reliably 
create the iSCSI device on boot?

[1] https://wiki.debian.org/SAN/iSCSI/open-iscsi

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Debian as iSCSI initiator on boot Lucio Crusca <lucio@sulweb.org> - 2024-12-04 09:10 +0100

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