-
Notifications
You must be signed in to change notification settings - Fork 451
/
bootstrap.go
119 lines (100 loc) · 4.37 KB
/
bootstrap.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
// Copyright (c) 2022 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 garden
import (
"context"
"fmt"
"time"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/discovery"
kubernetesclientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/utils/clock"
"sigs.k8s.io/controller-runtime/pkg/client"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
secretsmanager "github.com/gardener/gardener/pkg/utils/secrets/manager"
"github.com/gardener/gardener/pkg/utils/version"
)
// Bootstrapper is a runnable for bootstrapping the garden cluster.
type Bootstrapper struct {
Log logr.Logger
Client client.Client
RESTConfig *rest.Config
}
// Start runs as soon as the manager got leader.
func (b *Bootstrapper) Start(parentCtx context.Context) error {
// Other controllers depend on garden cluster bootstrapping.
// Hence, if we can't bootstrap the garden cluster in a short timeout, terminate and try again after restart.
ctx, cancel := context.WithTimeout(parentCtx, 30*time.Second)
defer cancel()
kubernetesClient, err := kubernetesclientset.NewForConfig(b.RESTConfig)
if err != nil {
return fmt.Errorf("failed creating kubernetes client: %w", err)
}
secretsManager, err := secretsmanager.New(ctx, b.Log.WithName("secretsmanager"), clock.RealClock{}, b.Client, v1beta1constants.GardenNamespace, v1beta1constants.SecretManagerIdentityControllerManager, secretsmanager.Config{})
if err != nil {
return fmt.Errorf("failed creating new secrets manager: %w", err)
}
if err := bootstrapCluster(ctx, b.Client, kubernetesClient.Discovery(), secretsManager); err != nil {
return fmt.Errorf("failed bootstrapping garden cluster: %w", err)
}
if err := secretsManager.Cleanup(ctx); err != nil {
return fmt.Errorf("failed cleaning up no longer required secrets: %w", err)
}
b.Log.Info("Successfully bootstrapped Garden cluster")
return nil
}
func bootstrapCluster(ctx context.Context, gardenClient client.Client, discoveryClient discovery.DiscoveryInterface, secretsManager secretsmanager.Interface) error {
const minKubernetesVersion = "1.20"
serverVersion, err := discoveryClient.ServerVersion()
if err != nil {
return fmt.Errorf("failed discovering garden cluster kubernetes version: %w", err)
}
gardenVersionOK, err := version.CompareVersions(serverVersion.GitVersion, ">=", minKubernetesVersion)
if err != nil {
return err
}
if !gardenVersionOK {
return fmt.Errorf("the Kubernetes version of the Garden cluster must be at least %s", minKubernetesVersion)
}
secretList := &corev1.SecretList{}
if err := gardenClient.List(
ctx,
secretList,
client.InNamespace(v1beta1constants.GardenNamespace),
client.MatchingLabels{v1beta1constants.GardenRole: v1beta1constants.GardenRoleGlobalMonitoring},
); err != nil {
return err
}
mustGenerateMonitoringSecret := true
for _, s := range secretList.Items {
managedBySecretsManager := s.Labels[secretsmanager.LabelKeyManagedBy] == secretsmanager.LabelValueSecretsManager &&
s.Labels[secretsmanager.LabelKeyManagerIdentity] == v1beta1constants.SecretManagerIdentityControllerManager
if !managedBySecretsManager {
// found a custom monitoring secret managed by a human operator
// keep it and don't take over responsibility for the monitoring secret
mustGenerateMonitoringSecret = false
break
}
}
// we don't want to override custom monitoring secret managed by a human operator
// only take over responsibility over monitoring secret if we find the legacy secret created by GCM or a new one managed by SecretsManager
if mustGenerateMonitoringSecret {
if _, err = generateGlobalMonitoringSecret(ctx, gardenClient, secretsManager); err != nil {
return err
}
}
return nil
}