mirror of https://github.com/k3s-io/k3s
93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
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/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package deployment
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import (
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"k8s.io/kubernetes/pkg/apis/extensions"
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"k8s.io/kubernetes/pkg/controller"
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)
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// rolloutRecreate implements the logic for recreating a replica set.
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func (dc *DeploymentController) rolloutRecreate(deployment *extensions.Deployment) error {
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// Don't create a new RS if not already existed, so that we avoid scaling up before scaling down
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newRS, oldRSs, err := dc.getAllReplicaSetsAndSyncRevision(deployment, false)
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if err != nil {
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return err
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}
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allRSs := append(oldRSs, newRS)
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// scale down old replica sets
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scaledDown, err := dc.scaleDownOldReplicaSetsForRecreate(controller.FilterActiveReplicaSets(oldRSs), deployment)
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if err != nil {
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return err
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}
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if scaledDown {
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// Update DeploymentStatus
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return dc.updateDeploymentStatus(allRSs, newRS, deployment)
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}
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// If we need to create a new RS, create it now
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// TODO: Create a new RS without re-listing all RSs.
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if newRS == nil {
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newRS, oldRSs, err = dc.getAllReplicaSetsAndSyncRevision(deployment, true)
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if err != nil {
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return err
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}
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allRSs = append(oldRSs, newRS)
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}
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// scale up new replica set
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scaledUp, err := dc.scaleUpNewReplicaSetForRecreate(newRS, deployment)
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if err != nil {
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return err
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}
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if scaledUp {
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// Update DeploymentStatus
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return dc.updateDeploymentStatus(allRSs, newRS, deployment)
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}
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dc.cleanupDeployment(oldRSs, deployment)
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// Sync deployment status
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return dc.syncDeploymentStatus(allRSs, newRS, deployment)
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}
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// scaleDownOldReplicaSetsForRecreate scales down old replica sets when deployment strategy is "Recreate"
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func (dc *DeploymentController) scaleDownOldReplicaSetsForRecreate(oldRSs []*extensions.ReplicaSet, deployment *extensions.Deployment) (bool, error) {
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scaled := false
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for _, rs := range oldRSs {
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// Scaling not required.
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if rs.Spec.Replicas == 0 {
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continue
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}
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scaledRS, _, err := dc.scaleReplicaSetAndRecordEvent(rs, 0, deployment)
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if err != nil {
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return false, err
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}
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if scaledRS {
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scaled = true
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}
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}
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return scaled, nil
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}
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// scaleUpNewReplicaSetForRecreate scales up new replica set when deployment strategy is "Recreate"
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func (dc *DeploymentController) scaleUpNewReplicaSetForRecreate(newRS *extensions.ReplicaSet, deployment *extensions.Deployment) (bool, error) {
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scaled, _, err := dc.scaleReplicaSetAndRecordEvent(newRS, deployment.Spec.Replicas, deployment)
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return scaled, err
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}
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