b4f8d88d51
Automatic merge from submit-queue [kubeadm] pre-flight check hostname to ensure kubelet can launch static pods li… <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, read our contributor guidelines https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md and developer guide https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md 2. If you want *faster* PR reviews, read how: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/faster_reviews.md 3. Follow the instructions for writing a release note: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes --> **What this PR does / why we need it**: pre-flight check hostname to ensure kubelet can launch static pods like kube-apiserver/kube-controller-manager **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # **Special notes for your reviewer**: # what is the influence of this issue? kubelet will not create api server and kcm pod if your hostname is uncorrect. It complain the config files in "/etc/kubernetes/manifests" are invlid. # how to reproduce this issue? change your hostname by `hostnamectl set-hostname vm_81_12_centos`. then run `kubeadm init`. you will get this error log from kubelet: ```log Oct 27 11:12:57 vm_81_12_centos kubelet: I1027 11:12:57.279458 2695 file.go:123] Can't process config file "/etc/kubernetes/manifests/kube-controller-manager.json": invalid pod: [metadata.name: Invalid value: "kube-controller-manager-vm_81_12_centos": must match the regex [a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)* (e.g. 'example.com') spec.nodeName: Invalid value: "vm_81_12_centos": must match the regex [a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)* (e.g. 'example.com')] ``` # where the error comes from in the code? `pkg/kubelet/config/file.go:144 sourceFile:extractFromDir` ```go func (s *sourceFile) extractFromDir(name string) ([]*api.Pod, error) { dirents, err := filepath.Glob(filepath.Join(name, "[^.]*")) if err != nil { return nil, fmt.Errorf("glob failed: %v", err) } pods := make([]*api.Pod, 0) if len(dirents) == 0 { return pods, nil } sort.Strings(dirents) for _, path := range dirents { statInfo, err := os.Stat(path) if err != nil { glog.V(1).Infof("Can't get metadata for %q: %v", path, err) continue } switch { case statInfo.Mode().IsDir(): glog.V(1).Infof("Not recursing into config path %q", path) case statInfo.Mode().IsRegular(): pod, err := s.extractFromFile(path) if err != nil { --> glog.V(1).Infof("Can't process config file %q: %v", path, err) } else { pods = append(pods, pod) } default: glog.V(1).Infof("Config path %q is not a directory or file: %v", path, statInfo.Mode()) } } return pods, nil } ``` # how to fix it? 1. change hostname by `hostnamectl set-hostname <right host name>` or 2. add `hostnameOverride` config. If hostnameOverride is set, then kubelet will use this value instead of system hostname. **Release note**: <!-- Steps to write your release note: 1. Use the release-note-* labels to set the release note state (if you have access) 2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`. --> ```release-note ``` …ke kube-apiserver/kube-controller-manager and so on. |
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Kubernetes
Are you ...
- Interested in learning more about using Kubernetes? Please see our user-facing documentation on kubernetes.io or try the Scalable Microservices with Kubernetes course
- Interested in hacking on the core Kubernetes code base? Keep reading!
Kubernetes is an open source system for managing containerized applications across multiple hosts, providing basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes is:
- lean: lightweight, simple, accessible
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- self-healing: auto-placement, auto-restart, auto-replication
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale, combined with best-of-breed ideas and practices from the community.
Kubernetes is ready for Production!
With the 1.0.1 release Kubernetes is ready to serve your production workloads.
Kubernetes can run anywhere!
You can run Kubernetes on your local workstation under Vagrant, cloud providers (e.g. GCE, AWS, Azure), and physical hardware. Essentially, anywhere Linux runs you can run Kubernetes. Checkout the Getting Started Guides for details.
Concepts
Kubernetes works with the following concepts:
- Cluster
- A cluster is a set of physical or virtual machines and other infrastructure resources used by Kubernetes to run your applications. Kubernetes can run anywhere! See the Getting Started Guides for instructions for a variety of services.
- Node
- A node is a physical or virtual machine running Kubernetes, onto which pods can be scheduled.
- Pod
- Pods are a colocated group of application containers with shared volumes. They're the smallest deployable units that can be created, scheduled, and managed with Kubernetes. Pods can be created individually, but it's recommended that you use a replication controller even if creating a single pod.
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Documentation
Kubernetes documentation is organized into several categories.
- Getting started guides
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- for people who want to port Kubernetes to a new environment
- User documentation
- for people who want to run programs on an existing Kubernetes cluster
- in the Kubernetes User Guide: Managing Applications Tip: You can also view help documentation out on http://kubernetes.io/docs/.
- the Kubectl Command Line Interface is a detailed reference on
the
kubectlCLI - User FAQ
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- for people who want to create a Kubernetes cluster and administer it
- in the Kubernetes Cluster Admin Guide
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- for people who want to write programs that access the Kubernetes API, write plugins or extensions, or modify the core Kubernetes code
- in the Kubernetes Developer Guide
- see also notes on the API
- see also the API object documentation, a detailed description of all fields found in the core API objects
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- hands-on introduction and example config files
- in the user guide
- in the docs/examples directory
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- design docs in the Kubernetes Design Overview and the docs/design directory
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- Wiki/FAQ
- in the wiki
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See which companies are committed to driving quality in Kubernetes on our community page.
Do you want to help "shape the evolution of technologies that are container packaged, dynamically scheduled and microservices oriented?"
You should consider joining the Cloud Native Computing Foundation. For details about who's involved and how Kubernetes plays a role, read their announcement.
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If you're interested in being a contributor and want to get involved in developing Kubernetes, start in the Kubernetes Developer Guide and also review the contributor guidelines.
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Community resources
- Awesome-kubernetes - http://ramitsurana.github.io/awesome-kubernetes
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Here you can learn more about the current happenings in the kubernetes community.