-
Notifications
You must be signed in to change notification settings - Fork 38.6k
/
postupgrade.go
321 lines (279 loc) · 12.9 KB
/
postupgrade.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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/*
Copyright 2017 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 upgrade
import (
"context"
"fmt"
"io"
"os"
"path/filepath"
"github.com/pkg/errors"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
errorsutil "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/sets"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/klog/v2"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
"k8s.io/kubernetes/cmd/kubeadm/app/features"
"k8s.io/kubernetes/cmd/kubeadm/app/phases/addons/dns"
"k8s.io/kubernetes/cmd/kubeadm/app/phases/addons/proxy"
"k8s.io/kubernetes/cmd/kubeadm/app/phases/bootstraptoken/clusterinfo"
nodebootstraptoken "k8s.io/kubernetes/cmd/kubeadm/app/phases/bootstraptoken/node"
kubeletphase "k8s.io/kubernetes/cmd/kubeadm/app/phases/kubelet"
patchnodephase "k8s.io/kubernetes/cmd/kubeadm/app/phases/patchnode"
"k8s.io/kubernetes/cmd/kubeadm/app/phases/uploadconfig"
kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
dryrunutil "k8s.io/kubernetes/cmd/kubeadm/app/util/dryrun"
)
// PerformPostUpgradeTasks runs nearly the same functions as 'kubeadm init' would do
// Note that the mark-control-plane phase is left out, not needed, and no token is created as that doesn't belong to the upgrade
func PerformPostUpgradeTasks(client clientset.Interface, cfg *kubeadmapi.InitConfiguration, patchesDir string, dryRun bool, out io.Writer) error {
var errs []error
// Upload currently used configuration to the cluster
// Note: This is done right in the beginning of cluster initialization; as we might want to make other phases
// depend on centralized information from this source in the future
if err := uploadconfig.UploadConfiguration(cfg, client); err != nil {
errs = append(errs, err)
}
// Create the new, version-branched kubelet ComponentConfig ConfigMap
if err := kubeletphase.CreateConfigMap(&cfg.ClusterConfiguration, patchesDir, client); err != nil {
errs = append(errs, errors.Wrap(err, "error creating kubelet configuration ConfigMap"))
}
// Write the new kubelet config down to disk and the env file if needed
if err := WriteKubeletConfigFiles(cfg, patchesDir, dryRun, out); err != nil {
errs = append(errs, err)
}
// Annotate the node with the crisocket information, sourced either from the InitConfiguration struct or
// --cri-socket.
// TODO: In the future we want to use something more official like NodeStatus or similar for detecting this properly
if err := patchnodephase.AnnotateCRISocket(client, cfg.NodeRegistration.Name, cfg.NodeRegistration.CRISocket); err != nil {
errs = append(errs, errors.Wrap(err, "error uploading crisocket"))
}
// Create RBAC rules that makes the bootstrap tokens able to get nodes
if err := nodebootstraptoken.AllowBoostrapTokensToGetNodes(client); err != nil {
errs = append(errs, err)
}
// Create/update RBAC rules that makes the bootstrap tokens able to post CSRs
if err := nodebootstraptoken.AllowBootstrapTokensToPostCSRs(client); err != nil {
errs = append(errs, err)
}
// Create/update RBAC rules that makes the bootstrap tokens able to get their CSRs approved automatically
if err := nodebootstraptoken.AutoApproveNodeBootstrapTokens(client); err != nil {
errs = append(errs, err)
}
// Create/update RBAC rules that makes the nodes to rotate certificates and get their CSRs approved automatically
if err := nodebootstraptoken.AutoApproveNodeCertificateRotation(client); err != nil {
errs = append(errs, err)
}
// TODO: Is this needed to do here? I think that updating cluster info should probably be separate from a normal upgrade
// Create the cluster-info ConfigMap with the associated RBAC rules
// if err := clusterinfo.CreateBootstrapConfigMapIfNotExists(client, kubeadmconstants.GetAdminKubeConfigPath()); err != nil {
// return err
//}
// Create/update RBAC rules that makes the cluster-info ConfigMap reachable
if err := clusterinfo.CreateClusterInfoRBACRules(client); err != nil {
errs = append(errs, err)
}
if err := PerformAddonsUpgrade(client, cfg, out); err != nil {
errs = append(errs, err)
}
return errorsutil.NewAggregate(errs)
}
// PerformAddonsUpgrade performs the upgrade of the coredns and kube-proxy addons.
// When UpgradeAddonsBeforeControlPlane feature gate is enabled, the addons will be upgraded immediately.
// When UpgradeAddonsBeforeControlPlane feature gate is disabled, the addons will only get updated after all the control plane instances have been upgraded.
func PerformAddonsUpgrade(client clientset.Interface, cfg *kubeadmapi.InitConfiguration, out io.Writer) error {
unupgradedControlPlanes, err := unupgradedControlPlaneInstances(client, cfg.NodeRegistration.Name)
if err != nil {
err = errors.Wrapf(err, "failed to determine whether all the control plane instances have been upgraded")
if !features.Enabled(cfg.FeatureGates, features.UpgradeAddonsBeforeControlPlane) {
return err
}
// when UpgradeAddonsBeforeControlPlane feature gate is enabled, just throw a warning
klog.V(1).Info(err)
}
if len(unupgradedControlPlanes) > 0 {
if !features.Enabled(cfg.FeatureGates, features.UpgradeAddonsBeforeControlPlane) {
fmt.Fprintf(out, "[upgrade/addons] skip upgrade addons because control plane instances %v have not been upgraded\n", unupgradedControlPlanes)
return nil
}
// when UpgradeAddonsBeforeControlPlane feature gate is enabled, just throw a warning
klog.V(1).Infof("upgrading addons when control plane instances %v have not been upgraded "+
"may lead to incompatibility problems. You can disable the UpgradeAddonsBeforeControlPlane feature gate to "+
"ensure that the addons upgrade is executed only when all the control plane instances have been upgraded.", unupgradedControlPlanes)
}
var errs []error
// If the coredns ConfigMap is missing, show a warning and assume that the
// DNS addon was skipped during "kubeadm init", and that its redeployment on upgrade is not desired.
//
// TODO: remove this once "kubeadm upgrade apply" phases are supported:
// https://github.com/kubernetes/kubeadm/issues/1318
var missingCoreDNSConfigMap bool
if _, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(
context.TODO(),
kubeadmconstants.CoreDNSConfigMap,
metav1.GetOptions{},
); err != nil && apierrors.IsNotFound(err) {
missingCoreDNSConfigMap = true
}
if missingCoreDNSConfigMap {
klog.Warningf("the ConfigMaps %q in the namespace %q were not found. "+
"Assuming that a DNS server was not deployed for this cluster. "+
"Note that once 'kubeadm upgrade apply' supports phases you "+
"will have to skip the DNS upgrade manually",
kubeadmconstants.CoreDNSConfigMap,
metav1.NamespaceSystem)
} else {
// Upgrade CoreDNS
if err := dns.EnsureDNSAddon(&cfg.ClusterConfiguration, client, out, false); err != nil {
errs = append(errs, err)
}
}
// If the kube-proxy ConfigMap is missing, show a warning and assume that kube-proxy
// was skipped during "kubeadm init", and that its redeployment on upgrade is not desired.
//
// TODO: remove this once "kubeadm upgrade apply" phases are supported:
// https://github.com/kubernetes/kubeadm/issues/1318
if _, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(
context.TODO(),
kubeadmconstants.KubeProxyConfigMap,
metav1.GetOptions{},
); err != nil && apierrors.IsNotFound(err) {
klog.Warningf("the ConfigMap %q in the namespace %q was not found. "+
"Assuming that kube-proxy was not deployed for this cluster. "+
"Note that once 'kubeadm upgrade apply' supports phases you "+
"will have to skip the kube-proxy upgrade manually",
kubeadmconstants.KubeProxyConfigMap,
metav1.NamespaceSystem)
} else {
// Upgrade kube-proxy
if err := proxy.EnsureProxyAddon(&cfg.ClusterConfiguration, &cfg.LocalAPIEndpoint, client, out, false); err != nil {
errs = append(errs, err)
}
}
return errorsutil.NewAggregate(errs)
}
// unupgradedControlPlaneInstances returns a list of control palne instances that have not yet been upgraded.
//
// NB. This function can only be called after the current control plane instance has been upgraded already.
// Because it determines whether the other control plane instances have been upgraded by checking whether
// the kube-apiserver image of other control plane instance is the same as that of this instance.
func unupgradedControlPlaneInstances(client clientset.Interface, nodeName string) ([]string, error) {
selector := labels.SelectorFromSet(labels.Set(map[string]string{
"component": kubeadmconstants.KubeAPIServer,
}))
pods, err := client.CoreV1().Pods(metav1.NamespaceSystem).List(context.TODO(), metav1.ListOptions{
LabelSelector: selector.String(),
})
if err != nil {
return nil, errors.Wrap(err, "failed to list kube-apiserver Pod from cluster")
}
if len(pods.Items) == 0 {
return nil, errors.Errorf("cannot find kube-apiserver Pod by label selector: %v", selector.String())
}
nodeImageMap := map[string]string{}
for _, pod := range pods.Items {
found := false
for _, c := range pod.Spec.Containers {
if c.Name == kubeadmconstants.KubeAPIServer {
nodeImageMap[pod.Spec.NodeName] = c.Image
found = true
break
}
}
if !found {
return nil, errors.Errorf("cannot find container by name %q for Pod %v", kubeadmconstants.KubeAPIServer, klog.KObj(&pod))
}
}
upgradedImage, ok := nodeImageMap[nodeName]
if !ok {
return nil, errors.Errorf("cannot find kube-apiserver image for current control plane instance %v", nodeName)
}
unupgradedNodes := sets.New[string]()
for node, image := range nodeImageMap {
if image != upgradedImage {
unupgradedNodes.Insert(node)
}
}
if len(unupgradedNodes) > 0 {
return sets.List(unupgradedNodes), nil
}
return nil, nil
}
func WriteKubeletConfigFiles(cfg *kubeadmapi.InitConfiguration, patchesDir string, dryRun bool, out io.Writer) error {
// Set up the kubelet directory to use. If dry-running, this will return a fake directory
kubeletDir, err := GetKubeletDir(dryRun)
if err != nil {
// The error here should never occur in reality, would only be thrown if /tmp doesn't exist on the machine.
return err
}
// Create a copy of the kubelet config file in the /etc/kubernetes/tmp/ folder.
backupDir, err := kubeadmconstants.CreateTempDirForKubeadm(kubeadmconstants.KubernetesDir, "kubeadm-kubelet-config")
if err != nil {
return err
}
src := filepath.Join(kubeletDir, kubeadmconstants.KubeletConfigurationFileName)
dest := filepath.Join(backupDir, kubeadmconstants.KubeletConfigurationFileName)
if !dryRun {
fmt.Printf("[upgrade] Backing up kubelet config file to %s\n", dest)
err := kubeadmutil.CopyFile(src, dest)
if err != nil {
return errors.Wrap(err, "error backing up the kubelet config file")
}
} else {
fmt.Printf("[dryrun] Would back up kubelet config file to %s\n", dest)
}
errs := []error{}
// Write the configuration for the kubelet down to disk so the upgraded kubelet can start with fresh config
if err := kubeletphase.WriteConfigToDisk(&cfg.ClusterConfiguration, kubeletDir, patchesDir, out); err != nil {
errs = append(errs, errors.Wrap(err, "error writing kubelet configuration to file"))
}
if dryRun { // Print what contents would be written
err := dryrunutil.PrintDryRunFile(kubeadmconstants.KubeletConfigurationFileName, kubeletDir, kubeadmconstants.KubeletRunDirectory, os.Stdout)
if err != nil {
errs = append(errs, errors.Wrap(err, "error printing files on dryrun"))
}
}
return errorsutil.NewAggregate(errs)
}
// GetKubeletDir gets the kubelet directory based on whether the user is dry-running this command or not.
func GetKubeletDir(dryRun bool) (string, error) {
if dryRun {
return kubeadmconstants.CreateTempDirForKubeadm("", "kubeadm-upgrade-dryrun")
}
return kubeadmconstants.KubeletRunDirectory, nil
}
// moveFiles moves files from one directory to another.
func moveFiles(files map[string]string) error {
filesToRecover := make(map[string]string, len(files))
for from, to := range files {
if err := os.Rename(from, to); err != nil {
return rollbackFiles(filesToRecover, err)
}
filesToRecover[to] = from
}
return nil
}
// rollbackFiles moves the files back to the original directory.
func rollbackFiles(files map[string]string, originalErr error) error {
errs := []error{originalErr}
for from, to := range files {
if err := os.Rename(from, to); err != nil {
errs = append(errs, err)
}
}
return errors.Errorf("couldn't move these files: %v. Got errors: %v", files, errorsutil.NewAggregate(errs))
}