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controller-runtime/example_test.go at master · dashpole/controller-runtime · GitHub
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/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package
controllerruntime_test
import
(
"context"
"fmt"
"os"
"time"
appsv1
"k8s.io/api/apps/v1"
corev1
"k8s.io/api/core/v1"
controllers
"sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// This example creates a simple application Controller that is configured for ReplicaSets and Pods.
//
// * Create a new application for ReplicaSets that manages Pods owned by the ReplicaSet and calls into
// ReplicaSetReconciler.
//
// * Start the application.
// TODO(pwittrock): Update this example when we have better dependency injection support
func
Example
() {
var
log
=
controllers
.
Log
.
WithName
(
"builder-examples"
)
manager
,
err
:=
controllers
.
NewManager
(
controllers
.
GetConfigOrDie
(), controllers.
Options
{})
if
err
!=
nil
{
log
.
Error
(
err
,
"could not create manager"
)
os
.
Exit
(
1
)
}
err
=
controllers
.
NewControllerManagedBy
(
manager
).
// Create the Controller
For
(
&
appsv1.
ReplicaSet
{}).
// ReplicaSet is the Application API
Owns
(
&
corev1.
Pod
{}).
// ReplicaSet owns Pods created by it
Complete
(
&
ReplicaSetReconciler
{
Client
:
manager
.
GetClient
()})
if
err
!=
nil
{
log
.
Error
(
err
,
"could not create controller"
)
os
.
Exit
(
1
)
}
if
err
:=
manager
.
Start
(
controllers
.
SetupSignalHandler
());
err
!=
nil
{
log
.
Error
(
err
,
"could not start manager"
)
os
.
Exit
(
1
)
}
}
// This example creates a simple application Controller that is configured for ReplicaSets and Pods.
// This application controller will be running leader election with the provided configuration in the manager options.
// If leader election configuration is not provided, controller runs leader election with default values.
// Default values taken from: https://github.com/kubernetes/apiserver/blob/master/pkg/apis/config/v1alpha1/defaults.go
// defaultLeaseDuration = 15 * time.Second
// defaultRenewDeadline = 10 * time.Second
// defaultRetryPeriod = 2 * time.Second
//
// * Create a new application for ReplicaSets that manages Pods owned by the ReplicaSet and calls into
// ReplicaSetReconciler.
//
// * Start the application.
// TODO(pwittrock): Update this example when we have better dependency injection support
func
Example_updateLeaderElectionDurations
() {
var
log
=
controllers
.
Log
.
WithName
(
"builder-examples"
)
leaseDuration
:=
100
*
time
.
Second
renewDeadline
:=
80
*
time
.
Second
retryPeriod
:=
20
*
time
.
Second
manager
,
err
:=
controllers
.
NewManager
(
controllers
.
GetConfigOrDie
(),
controllers.
Options
{
LeaseDuration
:
&
leaseDuration
,
RenewDeadline
:
&
renewDeadline
,
RetryPeriod
:
&
retryPeriod
,
})
if
err
!=
nil
{
log
.
Error
(
err
,
"could not create manager"
)
os
.
Exit
(
1
)
}
err
=
controllers
.
NewControllerManagedBy
(
manager
).
// Create the Controller
For
(
&
appsv1.
ReplicaSet
{}).
// ReplicaSet is the Application API
Owns
(
&
corev1.
Pod
{}).
// ReplicaSet owns Pods created by it
Complete
(
&
ReplicaSetReconciler
{
Client
:
manager
.
GetClient
()})
if
err
!=
nil
{
log
.
Error
(
err
,
"could not create controller"
)
os
.
Exit
(
1
)
}
if
err
:=
manager
.
Start
(
controllers
.
SetupSignalHandler
());
err
!=
nil
{
log
.
Error
(
err
,
"could not start manager"
)
os
.
Exit
(
1
)
}
}
// ReplicaSetReconciler is a simple Controller example implementation.
type
ReplicaSetReconciler
struct
{
client.
Client
}
// Implement the business logic:
// This function will be called when there is a change to a ReplicaSet or a Pod with an OwnerReference
// to a ReplicaSet.
//
// * Read the ReplicaSet
// * Read the Pods
// * Set a Label on the ReplicaSet with the Pod count
func
(
a
*
ReplicaSetReconciler
)
Reconcile
(
ctx
context.
Context
,
req
controllers.
Request
) (controllers.
Result
,
error
) {
// Read the ReplicaSet
rs
:=
&
appsv1.
ReplicaSet
{}
err
:=
a
.
Get
(
ctx
,
req
.
NamespacedName
,
rs
)
if
err
!=
nil
{
return
controllers.
Result
{},
err
}
// List the Pods matching the PodTemplate Labels
pods
:=
&
corev1.
PodList
{}
err
=
a
.
List
(
ctx
,
pods
,
client
.
InNamespace
(
req
.
Namespace
),
client
.
MatchingLabels
(
rs
.
Spec
.
Template
.
Labels
))
if
err
!=
nil
{
return
controllers.
Result
{},
err
}
// Update the ReplicaSet
rs
.
Labels
[
"pod-count"
]
=
fmt
.
Sprintf
(
"%v"
,
len
(
pods
.
Items
))
err
=
a
.
Update
(
context
.
TODO
(),
rs
)
if
err
!=
nil
{
return
controllers.
Result
{},
err
}
return
controllers.
Result
{},
nil
}
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