d47a513681
Automatic merge from submit-queue (batch tested with PRs 67397, 68019). If you want to cherry-pick this change to another branch, please follow the instructions here: https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md. kubeadm: fix offline and air-gapped support **What this PR does / why we need it**: 1. Change the error output of getAllDefaultRoutes() so that it includes information on which files were probed for the IP routing tables even if such files are obvious. Introduce a new error type which can be used to figure out of this error is exactly of the "no routes" type. 2. If netutil.ChooseBindAddress() fails looking up IP route tables it will fail with an error in which case the kubeadm config code will hard stop. This scenario is possible if the Linux user intentionally disables the WiFi from the distribution settings. In such a case the distro could empty files such files as /proc/net/route and ChooseBindAddress() will return an error. For improved offline support, don't error on such scenarios but instead show a warning. This is done by using the NoRoutesError type. Also default the address to 0.0.0.0. While doing that, prevent some commands like `init`, `join` and also phases like `controlplane` and `certs` from using such an invalid address. 3. If there is no internet, label versions fail and this breaks air-gapped setups unless the users pass an explicit version. To work around that: - Remain using 'release/stable-x.xx' as the default version. - On timeout or any error different from status 404 return error - On status 404 fallback to using the version of the client via kubeadmVersion() Add unit tests for kubeadmVersion(). **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: refs kubernetes/kubeadm#1041 **Special notes for your reviewer**: 1st and second commits fix offline support. 3rd commit fixes air-gabbed support (as discussed in the linked issue) the api-machinery change is only fmt.Errorf() related. **Release note**: ```release-note kubeadm: fix air-gapped support and also allow some kubeadm commands to work without an available networking interface ``` /cc @kubernetes/sig-cluster-lifecycle-pr-reviews /cc @kubernetes/sig-api-machinery-pr-reviews /assign @kad /assign @xiangpengzhao /area UX /area kubeadm /kind bug |
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Kubernetes
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