/
proxy.go
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/
proxy.go
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/*
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 proxy
import (
"bytes"
"fmt"
"io"
"github.com/pkg/errors"
apps "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
rbac "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kuberuntime "k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
clientset "k8s.io/client-go/kubernetes"
clientsetscheme "k8s.io/client-go/kubernetes/scheme"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
"k8s.io/kubernetes/cmd/kubeadm/app/componentconfigs"
"k8s.io/kubernetes/cmd/kubeadm/app/constants"
"k8s.io/kubernetes/cmd/kubeadm/app/images"
kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
)
const (
// KubeProxyServiceAccountName describes the name of the ServiceAccount for the kube-proxy addon
KubeProxyServiceAccountName = "kube-proxy"
// KubeProxyConfigMapRoleName sets the name of ClusterRole for ConfigMap
KubeProxyConfigMapRoleName = "kube-proxy"
)
// EnsureProxyAddon creates the kube-proxy addons
func EnsureProxyAddon(cfg *kubeadmapi.ClusterConfiguration, localEndpoint *kubeadmapi.APIEndpoint, client clientset.Interface, out io.Writer, printManifest bool) error {
cmByte, err := createKubeProxyConfigMap(cfg, localEndpoint, client, printManifest)
if err != nil {
return err
}
dsByte, err := createKubeProxyAddon(cfg, client, printManifest)
if err != nil {
return err
}
if err := printOrCreateKubeProxyObjects(cmByte, dsByte, client, out, printManifest); err != nil {
return err
}
return nil
}
// Create SA, RBACRules or print manifests of them to out if printManifest is true
func printOrCreateKubeProxyObjects(cmByte []byte, dsByte []byte, client clientset.Interface, out io.Writer, printManifest bool) error {
var saBytes, crbBytes, roleBytes, roleBindingBytes []byte
var err error
sa := &v1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: KubeProxyServiceAccountName,
Namespace: metav1.NamespaceSystem,
},
}
crb := &rbac.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: constants.KubeProxyClusterRoleBindingName,
},
RoleRef: rbac.RoleRef{
APIGroup: rbac.GroupName,
Kind: "ClusterRole",
Name: constants.KubeProxyClusterRoleName,
},
Subjects: []rbac.Subject{
{
Kind: rbac.ServiceAccountKind,
Name: KubeProxyServiceAccountName,
Namespace: metav1.NamespaceSystem,
},
},
}
role := &rbac.Role{
ObjectMeta: metav1.ObjectMeta{
Name: KubeProxyConfigMapRoleName,
Namespace: metav1.NamespaceSystem,
},
Rules: []rbac.PolicyRule{
{
Verbs: []string{"get"},
APIGroups: []string{""},
Resources: []string{"configmaps"},
ResourceNames: []string{constants.KubeProxyConfigMap},
},
},
}
rb := &rbac.RoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: KubeProxyConfigMapRoleName,
Namespace: metav1.NamespaceSystem,
},
RoleRef: rbac.RoleRef{
APIGroup: rbac.GroupName,
Kind: "Role",
Name: KubeProxyConfigMapRoleName,
},
Subjects: []rbac.Subject{
{
Kind: rbac.GroupKind,
Name: constants.NodeBootstrapTokenAuthGroup,
},
},
}
// Create the objects if printManifest is false
if !printManifest {
if err := apiclient.CreateOrUpdateServiceAccount(client, sa); err != nil {
return errors.Wrap(err, "error when creating kube-proxy service account")
}
if err := apiclient.CreateOrUpdateClusterRoleBinding(client, crb); err != nil {
return err
}
if err := apiclient.CreateOrUpdateRole(client, role); err != nil {
return err
}
if err := apiclient.CreateOrUpdateRoleBinding(client, rb); err != nil {
return err
}
fmt.Fprintln(out, "[addons] Applied essential addon: kube-proxy")
return nil
}
gv := schema.GroupVersion{Group: "", Version: "v1"}
if saBytes, err = kubeadmutil.MarshalToYaml(sa, gv); err != nil {
return err
}
gv = schema.GroupVersion{Group: "rbac.authorization.k8s.io", Version: "v1"}
if crbBytes, err = kubeadmutil.MarshalToYaml(crb, gv); err != nil {
return err
}
if roleBytes, err = kubeadmutil.MarshalToYaml(role, gv); err != nil {
return err
}
if roleBindingBytes, err = kubeadmutil.MarshalToYaml(rb, gv); err != nil {
return err
}
fmt.Fprintln(out, "---")
fmt.Fprintf(out, "%s", saBytes)
fmt.Fprintln(out, "---")
fmt.Fprintf(out, "%s", crbBytes)
fmt.Fprintln(out, "---")
fmt.Fprintf(out, "%s", roleBytes)
fmt.Fprintln(out, "---")
fmt.Fprintf(out, "%s", roleBindingBytes)
fmt.Fprint(out, "---")
fmt.Fprintf(out, "%s", cmByte)
fmt.Fprint(out, "---")
fmt.Fprintf(out, "%s", dsByte)
return nil
}
func createKubeProxyConfigMap(cfg *kubeadmapi.ClusterConfiguration, localEndpoint *kubeadmapi.APIEndpoint, client clientset.Interface, printManifest bool) ([]byte, error) {
// Generate ControlPlane Enpoint kubeconfig file
controlPlaneEndpoint, err := kubeadmutil.GetControlPlaneEndpoint(cfg.ControlPlaneEndpoint, localEndpoint)
if err != nil {
return []byte(""), err
}
kubeProxyCfg, ok := cfg.ComponentConfigs[componentconfigs.KubeProxyGroup]
if !ok {
return []byte(""), errors.New("no kube-proxy component config found in the active component config set")
}
proxyBytes, err := kubeProxyCfg.Marshal()
if err != nil {
return []byte(""), errors.Wrap(err, "error when marshaling")
}
var prefixBytes bytes.Buffer
apiclient.PrintBytesWithLinePrefix(&prefixBytes, proxyBytes, " ")
configMapBytes, err := kubeadmutil.ParseTemplate(KubeProxyConfigMap19,
struct {
ControlPlaneEndpoint string
ProxyConfig string
ProxyConfigMap string
ProxyConfigMapKey string
}{
ControlPlaneEndpoint: controlPlaneEndpoint,
ProxyConfig: prefixBytes.String(),
ProxyConfigMap: constants.KubeProxyConfigMap,
ProxyConfigMapKey: constants.KubeProxyConfigMapKey,
})
if err != nil {
return []byte(""), errors.Wrap(err, "error when parsing kube-proxy configmap template")
}
if printManifest {
return configMapBytes, nil
}
kubeproxyConfigMap := &v1.ConfigMap{}
if err := kuberuntime.DecodeInto(clientsetscheme.Codecs.UniversalDecoder(), configMapBytes, kubeproxyConfigMap); err != nil {
return []byte(""), errors.Wrap(err, "unable to decode kube-proxy configmap")
}
if !kubeProxyCfg.IsUserSupplied() {
componentconfigs.SignConfigMap(kubeproxyConfigMap)
}
// Create the ConfigMap for kube-proxy or update it in case it already exists
return []byte(""), apiclient.CreateOrUpdateConfigMap(client, kubeproxyConfigMap)
}
func createKubeProxyAddon(cfg *kubeadmapi.ClusterConfiguration, client clientset.Interface, printManifest bool) ([]byte, error) {
daemonSetbytes, err := kubeadmutil.ParseTemplate(KubeProxyDaemonSet19, struct{ Image, ProxyConfigMap, ProxyConfigMapKey string }{
Image: images.GetKubernetesImage(constants.KubeProxy, cfg),
ProxyConfigMap: constants.KubeProxyConfigMap,
ProxyConfigMapKey: constants.KubeProxyConfigMapKey,
})
if err != nil {
return []byte(""), errors.Wrap(err, "error when parsing kube-proxy daemonset template")
}
if printManifest {
return daemonSetbytes, nil
}
kubeproxyDaemonSet := &apps.DaemonSet{}
if err := kuberuntime.DecodeInto(clientsetscheme.Codecs.UniversalDecoder(), daemonSetbytes, kubeproxyDaemonSet); err != nil {
return []byte(""), errors.Wrap(err, "unable to decode kube-proxy daemonset")
}
// Propagate the http/https proxy host environment variables to the container
env := &kubeproxyDaemonSet.Spec.Template.Spec.Containers[0].Env
*env = append(*env, kubeadmutil.GetProxyEnvVars()...)
// Create the DaemonSet for kube-proxy or update it in case it already exists
return []byte(""), apiclient.CreateOrUpdateDaemonSet(client, kubeproxyDaemonSet)
}