provider

README

Follow these steps to be accepted as a provider within the Virtual Kubelet repo.

1. Replicate the life-cycle of a pod for example creation and deletion of a pod and how that maps to your service.
2. Create a new provider folder with a descriptive name and the necessary code.
3. When committing your code add a README.md, helm chart, dockerfile and specify a maintainer of the provider.
4. Within the PR itself add a justification for why the provider should be accepted, as well as customer use cases if applicable.

Some providers are translations of Virtual Kubelet to allow others to adapt their service or applications that are written in other languages.

Documentation

Index

• Constants
• Variables
• type InitConfig
• type InitFunc
• type OperatingSystems
  • func (o OperatingSystems) Names() []string
• type PodMetricsProvider
• type Provider
• type Store
  • func NewStore() *Store
  • func (s *Store) Exists(name string) bool
  • func (s *Store) Get(name string) InitFunc
  • func (s *Store) List() []string
  • func (s *Store) Register(name string, f InitFunc) error

Constants

const (
	// OperatingSystemLinux is the configuration value for defining Linux.
	OperatingSystemLinux = "Linux"
	// OperatingSystemWindows is the configuration value for defining Windows.
	OperatingSystemWindows = "Windows"
)

Variables

var (
	// ValidOperatingSystems defines the group of operating systems
	// that can be used as a kubelet node.
	ValidOperatingSystems = OperatingSystems{
		OperatingSystemLinux:   true,
		OperatingSystemWindows: true,
	}
)

Types

type InitConfig

type InitConfig struct {
	ConfigPath        string
	NodeName          string
	InternalIP        string
	DaemonPort        int32
	KubeClusterDomain string
	ResourceManager   *manager.ResourceManager
	ClusterId         string
	RemoteKubeConfig  string
	HomeClusterId     string
}

InitConfig is the config passed to initialize a registered provider.

type InitFunc

type InitFunc func(InitConfig) (Provider, error)

type OperatingSystems

type OperatingSystems map[string]bool

func (OperatingSystems) Names

func (o OperatingSystems) Names() []string

type PodMetricsProvider

type PodMetricsProvider interface {
	GetStatsSummary(context.Context) (*stats.Summary, error)
}

PodMetricsProvider is an optional interface that providers can implement to expose pod stats

type Provider

type Provider interface {
	module.PodLifecycleHandler

	PodMetricsProvider

	// GetContainerLogs retrieves the logs of a container by name from the provider.
	GetContainerLogs(ctx context.Context, namespace, podName, containerName string, opts api.ContainerLogOpts) (io.ReadCloser, error)

	// RunInContainer executes a command in a container in the pod, copying data
	// between in/out/err and the container's stdin/stdout/stderr.
	RunInContainer(ctx context.Context, namespace, podName, containerName string, cmd []string, attach api.AttachIO) error

	// ConfigureNode enables a provider to configure the node object that
	// will be used for Kubernetes.
	ConfigureNode(context.Context, *v1.Node)

	StartNodeUpdater(nodeRunner *module.NodeController) (chan struct{}, chan struct{}, error)
}

Provider contains the methods required to implement a virtual-kubelet provider.

Errors produced by these methods should implement an interface from github.com/netgroup-polito/liqo/cmdInternal/errdefs package in order for the core logic to be able to understand the type of failure.

type Store

type Store struct {
	// contains filtered or unexported fields
}

Store is used for registering/fetching providers

func NewStore

func NewStore() *Store

func (*Store) Exists

func (s *Store) Exists(name string) bool

Exists returns if there is an init function registered under the provided name

func (*Store) Get

func (s *Store) Get(name string) InitFunc

Get gets the registered init func for the given name The returned function may be nil if the given name is not registered.

func (*Store) List

func (s *Store) List() []string

List lists all the registered providers

func (*Store) Register

func (s *Store) Register(name string, f InitFunc) error

Register registers a providers init func by name