Do not assume systemd-resolved for resolv.conf #11813
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: VannTen The full list of commands accepted by this bot can be found here. The pull request process is described here
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We currently assume on some distribution that systemd-resolved is used and therefore we can use /run/systemd/resolve/resolv.conf to pass to the kubelet configuration. This breaks if the distribution is configured differently (use another DNS service) and force us to special case. Instead, detect if systemd-resolved is running dynamically and set kube_resolv_conf default accordingly.
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What type of PR is this?
/kind bug
What this PR does / why we need it:
We currently assume on some distribution that systemd-resolved is used
and therefore we can use /run/systemd/resolve/resolv.conf to pass to the
kubelet configuration.
This breaks if the distribution is configured differently (use another
DNS service) and force us to special case.
Instead, detect if systemd-resolved is running dynamically and set
kube_resolv_conf default accordingly.
Which issue(s) this PR fixes:
Fixes #11810
Special notes for your reviewer:
I'm just wondering if this could cause breakage when systemd-resolved is running but /etc/resolv.conf does not point to its managed files and has other settings 🤔
I'm not sure what we should do in that case (but I don't think hardcoding is the answer).
Does this PR introduce a user-facing change?: