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Bug 2131524

Summary:	sshd starts before the network is online
Product:	Red Hat Enterprise Linux 9	Reporter:	Frank Büttner <bugzilla>
Component:	openssh	Assignee:	Dmitry Belyavskiy <dbelyavs>
Status:	CLOSED DUPLICATE	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	9.0	CC:	jjelen
Target Milestone:	rc	Keywords:	Triaged
Target Release:	---	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-10-06 15:57:41 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Frank Büttner 2022-10-02 07:06:50 UTC

Description of problem:
The service will starts, before the network setup is completed.

Version-Release number of selected component (if applicable):
openssh-server-8.7p1-10.el9_0.x86_64


How reproducible:
Every time

Steps to Reproduce:
1. start the server

Actual results:
sshd don't come up at the first start, because the binding ip address is nor ready. This comes from the fact, that the network is not complete online at this time.

Expected results:
That sshd will run.


Additional info:
Easy fix, change After=network.target sshd-keygen.target to
After=network-online.target sshd-keygen.target.
That it will starts on its first try.

Comment 1 Dmitry Belyavskiy 2022-10-06 15:57:41 UTC

Dear Frank,

Thank you for raising this issue!

There are pretty good reasons not to use network-online.target as an universal solution. See the definition of it in https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/

It's not a Red Hat specific practice - e.g. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982950 is the similar problem in Debian.

https://bugzilla.redhat.com/show_bug.cgi?id=1936538#c22 provides what we consider a proper recommendation for custom setups similar to yours.

Hope this helps.

*** This bug has been marked as a duplicate of bug 1936538 ***