Documentation
¶
Overview ¶
Package manager is required to create Controllers and provides shared dependencies such as clients, caches, schemes, etc. Controllers must be started by calling Manager.Start.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type BaseContextFunc ¶ added in v0.12.0
BaseContextFunc is a function used to provide a base Context to Runnables managed by a Manager.
type LeaderElectionRunnable ¶ added in v0.2.0
type LeaderElectionRunnable interface {
// NeedLeaderElection returns true if the Runnable needs to be run in the leader election mode.
// e.g. controllers need to be run in leader election mode, while webhook server doesn't.
NeedLeaderElection() bool
}
LeaderElectionRunnable knows if a Runnable needs to be run in the leader election mode.
type Manager ¶
type Manager interface {
// Cluster holds a variety of methods to interact with a cluster.
cluster.Cluster
// Add will set requested dependencies on the component, and cause the component to be
// started when Start is called.
// Depending on if a Runnable implements LeaderElectionRunnable interface, a Runnable can be run in either
// non-leaderelection mode (always running) or leader election mode (managed by leader election if enabled).
Add(Runnable) error
// Elected is closed when this manager is elected leader of a group of
// managers, either because it won a leader election or because no leader
// election was configured.
Elected() <-chan struct{}
// AddMetricsServerExtraHandler adds an extra handler served on path to the http server that serves metrics.
// Might be useful to register some diagnostic endpoints e.g. pprof.
//
// Note that these endpoints are meant to be sensitive and shouldn't be exposed publicly.
//
// If the simple path -> handler mapping offered here is not enough,
// a new http server/listener should be added as Runnable to the manager via Add method.
AddMetricsServerExtraHandler(path string, handler http.Handler) error
// AddHealthzCheck allows you to add Healthz checker
AddHealthzCheck(name string, check healthz.Checker) error
// AddReadyzCheck allows you to add Readyz checker
AddReadyzCheck(name string, check healthz.Checker) error
// Start starts all registered Controllers and blocks until the context is cancelled.
// Returns an error if there is an error starting any controller.
//
// If LeaderElection is used, the binary must be exited immediately after this returns,
// otherwise components that need leader election might continue to run after the leader
// lock was lost.
Start(ctx context.Context) error
// GetWebhookServer returns a webhook.Server
GetWebhookServer() webhook.Server
// GetLogger returns this manager's logger.
GetLogger() logr.Logger
// GetControllerOptions returns controller global configuration options.
GetControllerOptions() config.Controller
}
Manager initializes shared dependencies such as Caches and Clients, and provides them to Runnables. A Manager is required to create Controllers.
Example (Add) ¶
This example adds a Runnable for the Manager to Start.
package main
import (
"context"
"os"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
var (
mgr manager.Manager
log = logf.Log.WithName("manager-examples")
)
func main() {
err := mgr.Add(manager.RunnableFunc(func(context.Context) error {
// Do something
return nil
}))
if err != nil {
log.Error(err, "unable add a runnable to the manager")
os.Exit(1)
}
}
Output:
Example (Start) ¶
This example starts a Manager that has had Runnables added.
package main
import (
"os"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/manager/signals"
)
var (
mgr manager.Manager
// NB: don't call SetLogger in init(), or else you'll mess up logging in the main suite.
log = logf.Log.WithName("manager-examples")
)
func main() {
if err := mgr.Start(signals.SetupSignalHandler()); err != nil {
log.Error(err, "unable start the manager")
os.Exit(1)
}
}
Output:
func New ¶
New returns a new Manager for creating Controllers. Note that if ContentType in the given config is not set, "application/vnd.kubernetes.protobuf" will be used for all built-in resources of Kubernetes, and "application/json" is for other types including all CRD resources.
Example ¶
This example creates a new Manager that can be used with controller.New to create Controllers.
package main
import (
"os"
"sigs.k8s.io/controller-runtime/pkg/client/config"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
var
// NB: don't call SetLogger in init(), or else you'll mess up logging in the main suite.
log = logf.Log.WithName("manager-examples")
func main() {
cfg, err := config.GetConfig()
if err != nil {
log.Error(err, "unable to get kubeconfig")
os.Exit(1)
}
mgr, err := manager.New(cfg, manager.Options{})
if err != nil {
log.Error(err, "unable to set up manager")
os.Exit(1)
}
log.Info("created manager", "manager", mgr)
}
Output:
Example (LimitToNamespaces) ¶
This example creates a new Manager that has a cache scoped to a list of namespaces.
package main
import (
"os"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client/config"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
var
// NB: don't call SetLogger in init(), or else you'll mess up logging in the main suite.
log = logf.Log.WithName("manager-examples")
func main() {
cfg, err := config.GetConfig()
if err != nil {
log.Error(err, "unable to get kubeconfig")
os.Exit(1)
}
mgr, err := manager.New(cfg, manager.Options{
NewCache: func(config *rest.Config, opts cache.Options) (cache.Cache, error) {
opts.DefaultNamespaces = map[string]cache.Config{
"namespace1": {},
"namespace2": {},
}
return cache.New(config, opts)
}},
)
if err != nil {
log.Error(err, "unable to set up manager")
os.Exit(1)
}
log.Info("created manager", "manager", mgr)
}
Output:
type Options ¶
type Options struct {
// Scheme is the scheme used to resolve runtime.Objects to GroupVersionKinds / Resources.
// Defaults to the kubernetes/client-go scheme.Scheme, but it's almost always better
// to pass your own scheme in. See the documentation in pkg/scheme for more information.
//
// If set, the Scheme will be used to create the default Client and Cache.
Scheme *runtime.Scheme
// MapperProvider provides the rest mapper used to map go types to Kubernetes APIs.
//
// If set, the RESTMapper returned by this function is used to create the RESTMapper
// used by the Client and Cache.
MapperProvider func(c *rest.Config, httpClient *http.Client) (meta.RESTMapper, error)
// Cache is the cache.Options that will be used to create the default Cache.
// By default, the cache will watch and list requested objects in all namespaces.
Cache cache.Options
// NewCache is the function that will create the cache to be used
// by the manager. If not set this will use the default new cache function.
//
// When using a custom NewCache, the Cache options will be passed to the
// NewCache function.
//
// NOTE: LOW LEVEL PRIMITIVE!
// Only use a custom NewCache if you know what you are doing.
NewCache cache.NewCacheFunc
// Client is the client.Options that will be used to create the default Client.
// By default, the client will use the cache for reads and direct calls for writes.
Client client.Options
// NewClient is the func that creates the client to be used by the manager.
// If not set this will create a Client backed by a Cache for read operations
// and a direct Client for write operations.
//
// When using a custom NewClient, the Client options will be passed to the
// NewClient function.
//
// NOTE: LOW LEVEL PRIMITIVE!
// Only use a custom NewClient if you know what you are doing.
NewClient client.NewClientFunc
// Logger is the logger that should be used by this manager.
// If none is set, it defaults to log.Log global logger.
Logger logr.Logger
// LeaderElection determines whether or not to use leader election when
// starting the manager.
LeaderElection bool
// LeaderElectionResourceLock determines which resource lock to use for leader election,
// defaults to "leases". Change this value only if you know what you are doing.
//
// If you are using `configmaps`/`endpoints` resource lock and want to migrate to "leases",
// you might do so by migrating to the respective multilock first ("configmapsleases" or "endpointsleases"),
// which will acquire a leader lock on both resources.
// After all your users have migrated to the multilock, you can go ahead and migrate to "leases".
// Please also keep in mind, that users might skip versions of your controller.
//
// Note: before controller-runtime version v0.7, it was set to "configmaps".
// And from v0.7 to v0.11, the default was "configmapsleases", which was
// used to migrate from configmaps to leases.
// Since the default was "configmapsleases" for over a year, spanning five minor releases,
// any actively maintained operators are very likely to have a released version that uses
// "configmapsleases". Therefore defaulting to "leases" should be safe since v0.12.
//
// So, what do you have to do when you are updating your controller-runtime dependency
// from a lower version to v0.12 or newer?
// - If your operator matches at least one of these conditions:
// - the LeaderElectionResourceLock in your operator has already been explicitly set to "leases"
// - the old controller-runtime version is between v0.7.0 and v0.11.x and the
// LeaderElectionResourceLock wasn't set or was set to "leases"/"configmapsleases"/"endpointsleases"
// feel free to update controller-runtime to v0.12 or newer.
// - Otherwise, you may have to take these steps:
// 1. update controller-runtime to v0.12 or newer in your go.mod
// 2. set LeaderElectionResourceLock to "configmapsleases" (or "endpointsleases")
// 3. package your operator and upgrade it in all your clusters
// 4. only if you have finished 3, you can remove the LeaderElectionResourceLock to use the default "leases"
// Otherwise, your operator might end up with multiple running instances that
// each acquired leadership through different resource locks during upgrades and thus
// act on the same resources concurrently.
LeaderElectionResourceLock string
// LeaderElectionNamespace determines the namespace in which the leader
// election resource will be created.
LeaderElectionNamespace string
// LeaderElectionID determines the name of the resource that leader election
// will use for holding the leader lock.
LeaderElectionID string
// LeaderElectionConfig can be specified to override the default configuration
// that is used to build the leader election client.
LeaderElectionConfig *rest.Config
// LeaderElectionReleaseOnCancel defines if the leader should step down voluntarily
// when the Manager ends. This requires the binary to immediately end when the
// Manager is stopped, otherwise this setting is unsafe. Setting this significantly
// speeds up voluntary leader transitions as the new leader doesn't have to wait
// LeaseDuration time first.
LeaderElectionReleaseOnCancel bool
// LeaderElectionResourceLockInterface allows to provide a custom resourcelock.Interface that was created outside
// of the controller-runtime. If this value is set the options LeaderElectionID, LeaderElectionNamespace,
// LeaderElectionResourceLock, LeaseDuration, RenewDeadline and RetryPeriod will be ignored. This can be useful if you
// want to use a locking mechanism that is currently not supported, like a MultiLock across two Kubernetes clusters.
LeaderElectionResourceLockInterface resourcelock.Interface
// LeaseDuration is the duration that non-leader candidates will
// wait to force acquire leadership. This is measured against time of
// last observed ack. Default is 15 seconds.
LeaseDuration *time.Duration
// RenewDeadline is the duration that the acting controlplane will retry
// refreshing leadership before giving up. Default is 10 seconds.
RenewDeadline *time.Duration
// RetryPeriod is the duration the LeaderElector clients should wait
// between tries of actions. Default is 2 seconds.
RetryPeriod *time.Duration
// Metrics are the metricsserver.Options that will be used to create the metricsserver.Server.
Metrics metricsserver.Options
// HealthProbeBindAddress is the TCP address that the controller should bind to
// for serving health probes
// It can be set to "0" or "" to disable serving the health probe.
HealthProbeBindAddress string
// Readiness probe endpoint name, defaults to "readyz"
ReadinessEndpointName string
// Liveness probe endpoint name, defaults to "healthz"
LivenessEndpointName string
// PprofBindAddress is the TCP address that the controller should bind to
// for serving pprof.
// It can be set to "" or "0" to disable the pprof serving.
// Since pprof may contain sensitive information, make sure to protect it
// before exposing it to public.
PprofBindAddress string
// WebhookServer is an externally configured webhook.Server. By default,
// a Manager will create a server via webhook.NewServer with default settings.
// If this is set, the Manager will use this server instead.
WebhookServer webhook.Server
// BaseContext is the function that provides Context values to Runnables
// managed by the Manager. If a BaseContext function isn't provided, Runnables
// will receive a new Background Context instead.
BaseContext BaseContextFunc
// EventBroadcaster records Events emitted by the manager and sends them to the Kubernetes API
// Use this to customize the event correlator and spam filter
//
// Deprecated: using this may cause goroutine leaks if the lifetime of your manager or controllers
// is shorter than the lifetime of your process.
EventBroadcaster record.EventBroadcaster
// GracefulShutdownTimeout is the duration given to runnable to stop before the manager actually returns on stop.
// To disable graceful shutdown, set to time.Duration(0)
// To use graceful shutdown without timeout, set to a negative duration, e.G. time.Duration(-1)
// The graceful shutdown is skipped for safety reasons in case the leader election lease is lost.
GracefulShutdownTimeout *time.Duration
// Controller contains global configuration options for controllers
// registered within this manager.
// +optional
Controller config.Controller
// contains filtered or unexported fields
}
Options are the arguments for creating a new Manager.
type Runnable ¶
type Runnable interface {
// Start starts running the component. The component will stop running
// when the context is closed. Start blocks until the context is closed or
// an error occurs.
Start(context.Context) error
}
Runnable allows a component to be started. It's very important that Start blocks until it's done running.
type RunnableFunc ¶
RunnableFunc implements Runnable using a function. It's very important that the given function block until it's done running.
type Server ¶ added in v0.18.0
type Server struct {
// Name is an optional string that describes the purpose of the server. It is used in logs to distinguish
// among multiple servers.
Name string
// Server is the HTTP server to run. It is required.
Server *http.Server
// Listener is an optional listener to use. If not set, the server start a listener using the server.Addr.
// Using a listener is useful when the port reservation needs to happen in advance of this runnable starting.
Listener net.Listener
// OnlyServeWhenLeader is an optional bool that indicates that the server should only be started when the manager is the leader.
OnlyServeWhenLeader bool
// ShutdownTimeout is an optional duration that indicates how long to wait for the server to shutdown gracefully. If not set,
// the server will wait indefinitely for all connections to close.
ShutdownTimeout *time.Duration
}
Server is a general purpose HTTP server Runnable for a manager. It is used to serve some internal handlers for health probes and profiling, but it can also be used to run custom servers.
func (*Server) NeedLeaderElection ¶ added in v0.18.0
NeedLeaderElection returns true if the server should only be started when the manager is the leader.
Source Files
Directories
¶
| Path | Synopsis |
|---|---|
|
internal
|
|
|
Package signals contains libraries for handling signals to gracefully shutdown the manager in combination with Kubernetes pod graceful termination policy.
|
Package signals contains libraries for handling signals to gracefully shutdown the manager in combination with Kubernetes pod graceful termination policy. |
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