Bug 1800900
| Summary: | After a reboot nodes get "localhost.localdomain" when "idrac" NIC is present | ||
|---|---|---|---|
| Product: | OpenShift Container Platform | Reporter: | William Caban <william.caban> |
| Component: | RHCOS | Assignee: | Colin Walters <walters> |
| Status: | CLOSED WONTFIX | QA Contact: | Michael Nguyen <mnguyen> |
| Severity: | high | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 4.3.0 | CC: | aos-bugs, augol, bbreard, dmoessne, dornelas, dustymabe, fedoraproject, imcleod, jligon, jokerman, miabbott, nstielau, obockows, sgordon, walters |
| Target Milestone: | --- | ||
| Target Release: | 4.5.0 | ||
| 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: | 2020-04-20 14:38:01 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: | |||
| Bug Depends On: | |||
| Bug Blocks: | 1186913, 1771572 | ||
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Description
William Caban
2020-02-08 22:30:45 UTC
I think a best practice here is to turn off the default of DHCP on connected interfaces if using static addressing: /etc/NetworkManager.conf.d/disabledhcp.conf [main] no-auto-default=* Or specifically just do: /etc/NetworkManager.conf.d/unmanaged-idrac.conf [keyfile] unmanaged-devices=interface-name:idrac One thing perhaps we could do is add a kernel cmdline to make this even easier, like `nm.no-auto-default=*` or something. I am not sure we can do more here; we default to DHCP which will potentially change the hostname. We did debate avoiding hostname changes after kubelet has started, but that blurs the concepts of "source of truth": https://github.com/coreos/ignition-dracut/pull/156 Disabling DHCP on interfaces that you don't want is the right thing to do. As mentioned above we can make this more ergonomic of course but I think that should be a separate bug. I think we likely need a KCS on this. For people who are in this situation where you're assigning static IP addresses; if you are doing so via the kernel cmdline, then in OpenShift 4.4 you can pass the hostname on the kernel cmdline since https://github.com/coreos/ignition-dracut/pull/156 merged. If you are doing static IP addresses by injecting files into the pointer Ignition configuration, then you should also override `/etc/hostname` there. If you are using DHCP, but you only want to do DHCP on one specific interface and may have other interfaces, then the technique in https://bugzilla.redhat.com/show_bug.cgi?id=1800900#c1 may help. Today, `kubelet.service` is `After=network-online.target`: https://github.com/openshift/machine-config-operator/blob/master/templates/master/01-master-kubelet/_base/units/kubelet.yaml#L7 This situation will most often occur when something causes that to either fail, or occur before the expected IP address/hostname is assigned. (In reply to Colin Walters from comment #7) > I think we likely need a KCS on this. > > For people who are in this situation where you're assigning static IP > addresses; if you are doing so via the kernel cmdline, then in OpenShift 4.4 > you can pass the hostname on the kernel cmdline since > https://github.com/coreos/ignition-dracut/pull/156 merged. > > If you are doing static IP addresses by injecting files into the pointer > Ignition configuration, then you should also override `/etc/hostname` there. > > If you are using DHCP, but you only want to do DHCP on one specific > interface and may have other interfaces, then the technique in > https://bugzilla.redhat.com/show_bug.cgi?id=1800900#c1 > may help. I'll get something created in the next couple of weeks. I may bug you or Micah if I have questions. The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days |