ceph-csi/internal/controller/controller.go
Madhu Rajanna e61012da14 rbd: use leases for leader election
use leases for leader election instead
of the deprecated configmap based leader
election.

This PR is making leases as default leader election
refer https://github.com/kubernetes-sigs/
controller-runtime/pull/1773, default from configmap
to configmap leases was done with
https://github.com/kubernetes-sigs/
controller-runtime/pull/1144.

Release notes https://github.com/kubernetes-sigs/
controller-runtime/releases/tag/v0.7.0

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
(cherry picked from commit d886ab0d66)
2022-04-15 10:24:19 +00:00

87 lines
2.3 KiB
Go

/*
Copyright 2020 The Ceph-CSI 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 controller
import (
"fmt"
"github.com/ceph/ceph-csi/internal/util/log"
"k8s.io/client-go/tools/leaderelection/resourcelock"
clientConfig "sigs.k8s.io/controller-runtime/pkg/client/config"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/manager/signals"
)
// Manager is the interface that will wrap Add function.
// The New controllers which gets added, as to implement Add function to get
// started by the manager.
type Manager interface {
Add(manager.Manager, Config) error
}
// Config holds the drivername and namespace name.
type Config struct {
DriverName string
Namespace string
}
// ControllerList holds the list of managers need to be started.
var ControllerList []Manager
// addToManager calls the registered managers Add method.
func addToManager(mgr manager.Manager, config Config) error {
for _, c := range ControllerList {
err := c.Add(mgr, config)
if err != nil {
return fmt.Errorf("failed to add: %w", err)
}
}
return nil
}
// Start will start all the registered managers.
func Start(config Config) error {
electionID := config.DriverName + "-" + config.Namespace
opts := manager.Options{
LeaderElection: true,
// disable metrics
MetricsBindAddress: "0",
LeaderElectionNamespace: config.Namespace,
LeaderElectionResourceLock: resourcelock.LeasesResourceLock,
LeaderElectionID: electionID,
}
mgr, err := manager.New(clientConfig.GetConfigOrDie(), opts)
if err != nil {
log.ErrorLogMsg("failed to create manager %s", err)
return err
}
err = addToManager(mgr, config)
if err != nil {
log.ErrorLogMsg("failed to add manager %s", err)
return err
}
err = mgr.Start(signals.SetupSignalHandler())
if err != nil {
log.ErrorLogMsg("failed to start manager %s", err)
}
return err
}