[release-4.6] Bug 2102762: Add KUBELET_NODEIP_HINT to nodeip-configuration #3215
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When we added the nodeip-configuration service for None platform deployments, we broke some existing users who were relying on the (largely undefined) previous behavior Kubelet used to select its node ip. While it is possible to work around this by overriding the node ip selection logic, that's very cumbersome and not an acceptable user experience. This change adds a KUBELET_NODEIP_HINT env variable that can be used to override the default behavior of runtimecfg when selecting a node ip. When the variable is unset, the old behavior of selecting an address on the interface of the default route will take effect. When the variable is set, its value will be passed to runtimecfg like a VIP for the IPI platforms. This will cause runtimecfg to prefer an address in the same subnet as the one provided in KUBELET_NODEIP_HINT. If no such address is found, it will fall back to the default route logic as before. KUBELET_NODEIP_HINT can be set using a systemd environment file. The file must be named /etc/default/nodeip-configuration with contents such as (replacing the IP as appropriate): KUBELET_NODEIP_HINT=192.0.2.1 This file should be created using a machine-config manifest that is passed to the installer so it will take effect on initial deployment. The node ip cannot be changed after the node registers initially so this cannot be done as a day 2 operation. Note that the IP specified in the hint does not necessarily need to exist in the environment, it just needs to be in the correct subnet. No traffic will be sent to this address. Co-authored-by: Dan Winship <danwinship@redhat.com>
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@openshift-cherrypick-robot: Bugzilla bug 2101555 has been cloned as Bugzilla bug 2102762. Retitling PR to link against new bug. In response to this:
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@openshift-cherrypick-robot: This pull request references Bugzilla bug 2102762, which is valid. The bug has been moved to the POST state. The bug has been updated to refer to the pull request using the external bug tracker. 6 validation(s) were run on this bug
No GitHub users were found matching the public email listed for the QA contact in Bugzilla (vvoronko@redhat.com), skipping review request. In response to this:
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/lgtm |
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/label cherry-pick-approved |
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/cc @reihl Can you give the cherry-pick-approved label to this? Thanks. |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: cybertron, openshift-cherrypick-robot, reihl, sinnykumari The full list of commands accepted by this bot can be found here. The pull request process is described here
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/close At this point it's unlikely anyone is waiting for this fix and it's already available in 4.7 and up. |
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@cybertron: Closed this PR. In response to this:
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@openshift-cherrypick-robot: This pull request references Bugzilla bug 2102762. The bug has been updated to no longer refer to the pull request using the external bug tracker. In response to this:
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This is an automated cherry-pick of #3210
/assign cybertron