clitools/pkg/node/controller.go
raw ยท 10889 bytes
package node
import (
"context"
"fmt"
"reflect"
"sort"
"strings"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/client-go/kubernetes"
"k8s.io/klog/v2"
monov1alpha1 "example.com/monok8s/pkg/apis/monok8s/v1alpha1"
"example.com/monok8s/pkg/kube"
templates "example.com/monok8s/pkg/templates"
)
func applyControllerDeploymentResources(ctx context.Context, n *NodeContext) error {
if strings.TrimSpace(n.Config.Spec.ClusterRole) != "control-plane" || !n.Config.Spec.EnableControlAgent {
klog.InfoS("skipped controller deployment",
"clusterRole", n.Config.Spec.ClusterRole,
"enableControlAgent", n.Config.Spec.EnableControlAgent,
)
return nil
}
if err := ApplyCRDs(ctx, n); err != nil {
return err
}
namespace := strings.TrimSpace(n.Config.Namespace)
if namespace == "" {
namespace = templates.DefaultNamespace
}
clients, err := kube.NewClientsFromKubeconfig(adminKubeconfigPath)
if err != nil {
return fmt.Errorf("build kube clients from %s: %w", adminKubeconfigPath, err)
}
labels := map[string]string{
"app.kubernetes.io/name": controlAgentName,
"app.kubernetes.io/component": "controller",
"app.kubernetes.io/part-of": "monok8s",
"app.kubernetes.io/managed-by": "ctl",
}
kubeClient := clients.Kubernetes
if err := ensureNamespace(ctx, kubeClient, namespace, labels); err != nil {
return fmt.Errorf("ensure namespace %q: %w", namespace, err)
}
if err := applyControllerServiceAccount(ctx, kubeClient, namespace, labels); err != nil {
return fmt.Errorf("apply serviceaccount: %w", err)
}
if err := applyControllerClusterRole(ctx, kubeClient, labels); err != nil {
return fmt.Errorf("apply clusterrole: %w", err)
}
if err := applyControllerClusterRoleBinding(ctx, kubeClient, namespace, labels); err != nil {
return fmt.Errorf("apply clusterrolebinding: %w", err)
}
if err := applyControllerDeployment(ctx, kubeClient, namespace, labels); err != nil {
return fmt.Errorf("apply deployment: %w", err)
}
return nil
}
func applyControllerServiceAccount(ctx context.Context, kubeClient kubernetes.Interface, namespace string, labels map[string]string) error {
automount := true
want := &corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: controlAgentName,
Namespace: namespace,
Labels: labels,
},
AutomountServiceAccountToken: &automount,
}
existing, err := kubeClient.CoreV1().ServiceAccounts(namespace).Get(ctx, controlAgentName, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
_, err = kubeClient.CoreV1().ServiceAccounts(namespace).Create(ctx, want, metav1.CreateOptions{})
return err
}
if err != nil {
return err
}
changed := false
if !reflect.DeepEqual(existing.Labels, want.Labels) {
existing.Labels = want.Labels
changed = true
}
if !reflect.DeepEqual(existing.AutomountServiceAccountToken, want.AutomountServiceAccountToken) {
existing.AutomountServiceAccountToken = want.AutomountServiceAccountToken
changed = true
}
if !changed {
return nil
}
_, err = kubeClient.CoreV1().ServiceAccounts(namespace).Update(ctx, existing, metav1.UpdateOptions{})
return err
}
func applyControllerClusterRole(ctx context.Context, kubeClient kubernetes.Interface, labels map[string]string) error {
wantRules := []rbacv1.PolicyRule{
{
APIGroups: []string{monov1alpha1.Group},
Resources: []string{"osupgrades"},
Verbs: []string{"get", "list", "watch"},
},
{
APIGroups: []string{monov1alpha1.Group},
Resources: []string{"osupgrades/status"},
Verbs: []string{"get", "patch", "update"},
},
{
APIGroups: []string{monov1alpha1.Group},
Resources: []string{"osupgradeprogresses"},
Verbs: []string{"get", "list", "create"},
},
{
APIGroups: []string{monov1alpha1.Group},
Resources: []string{"osupgradeprogresses/status"},
Verbs: []string{"create"},
},
{
APIGroups: []string{""},
Resources: []string{"nodes"},
Verbs: []string{"get", "list", "watch"},
},
}
want := &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: controlAgentName,
Labels: labels,
},
Rules: wantRules,
}
existing, err := kubeClient.RbacV1().ClusterRoles().Get(ctx, controlAgentName, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
_, err = kubeClient.RbacV1().ClusterRoles().Create(ctx, want, metav1.CreateOptions{})
return err
}
if err != nil {
return err
}
changed := false
if !reflect.DeepEqual(existing.Labels, want.Labels) {
existing.Labels = want.Labels
changed = true
}
if !reflect.DeepEqual(existing.Rules, want.Rules) {
existing.Rules = want.Rules
changed = true
}
if !changed {
return nil
}
_, err = kubeClient.RbacV1().ClusterRoles().Update(ctx, existing, metav1.UpdateOptions{})
return err
}
func applyControllerClusterRoleBinding(ctx context.Context, kubeClient kubernetes.Interface, namespace string, labels map[string]string) error {
wantSubjects := []rbacv1.Subject{
{
Kind: "ServiceAccount",
Name: controlAgentName,
Namespace: namespace,
},
}
wantRoleRef := rbacv1.RoleRef{
APIGroup: rbacv1.GroupName,
Kind: "ClusterRole",
Name: controlAgentName,
}
want := &rbacv1.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: controlAgentName,
Labels: labels,
},
Subjects: wantSubjects,
RoleRef: wantRoleRef,
}
existing, err := kubeClient.RbacV1().ClusterRoleBindings().Get(ctx, controlAgentName, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
_, err = kubeClient.RbacV1().ClusterRoleBindings().Create(ctx, want, metav1.CreateOptions{})
return err
}
if err != nil {
return err
}
changed := false
if !reflect.DeepEqual(existing.Labels, want.Labels) {
existing.Labels = want.Labels
changed = true
}
if !reflect.DeepEqual(existing.Subjects, want.Subjects) {
existing.Subjects = want.Subjects
changed = true
}
if !reflect.DeepEqual(existing.RoleRef, want.RoleRef) {
existing.RoleRef = want.RoleRef
changed = true
}
if !changed {
return nil
}
_, err = kubeClient.RbacV1().ClusterRoleBindings().Update(ctx, existing, metav1.UpdateOptions{})
return err
}
func applyControllerDeployment(ctx context.Context, kubeClient kubernetes.Interface, namespace string, labels map[string]string) error {
replicas := int32(1)
selectorLabels := map[string]string{
"app.kubernetes.io/name": controlAgentName,
"app.kubernetes.io/component": "controller",
}
podLabels := mergeStringMaps(labels, selectorLabels)
runAsNonRoot := true
allowPrivilegeEscalation := false
want := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: controlAgentName,
Namespace: namespace,
Labels: labels,
},
Spec: appsv1.DeploymentSpec{
Replicas: &replicas,
Selector: &metav1.LabelSelector{
MatchLabels: selectorLabels,
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: podLabels,
},
Spec: corev1.PodSpec{
ServiceAccountName: controlAgentName,
Containers: []corev1.Container{
{
Name: "controller",
Image: controlAgentImage,
ImagePullPolicy: corev1.PullIfNotPresent,
Args: []string{
"controller",
},
Env: []corev1.EnvVar{
{
Name: "POD_NAME",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
APIVersion: "v1",
FieldPath: "metadata.name",
},
},
},
{
Name: "POD_NAMESPACE",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
APIVersion: "v1",
FieldPath: "metadata.namespace",
},
},
},
{
Name: "NODE_NAME",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
APIVersion: "v1",
FieldPath: "spec.nodeName",
},
},
},
},
Ports: []corev1.ContainerPort{
{
Name: "http",
ContainerPort: 8080,
Protocol: corev1.ProtocolTCP,
},
},
LivenessProbe: &corev1.Probe{
ProbeHandler: corev1.ProbeHandler{
HTTPGet: &corev1.HTTPGetAction{
Path: "/healthz",
Port: intstr.FromString("http"),
},
},
},
ReadinessProbe: &corev1.Probe{
ProbeHandler: corev1.ProbeHandler{
HTTPGet: &corev1.HTTPGetAction{
Path: "/readyz",
Port: intstr.FromString("http"),
},
},
},
SecurityContext: &corev1.SecurityContext{
RunAsNonRoot: &runAsNonRoot,
AllowPrivilegeEscalation: &allowPrivilegeEscalation,
},
},
},
},
},
},
}
existing, err := kubeClient.AppsV1().Deployments(namespace).Get(ctx, controlAgentName, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
_, err = kubeClient.AppsV1().Deployments(namespace).Create(ctx, want, metav1.CreateOptions{})
return err
}
if err != nil {
return err
}
changed := false
if !reflect.DeepEqual(existing.Labels, want.Labels) {
existing.Labels = want.Labels
changed = true
}
if !reflect.DeepEqual(existing.Spec.Replicas, want.Spec.Replicas) {
existing.Spec.Replicas = want.Spec.Replicas
changed = true
}
if !reflect.DeepEqual(existing.Spec.Selector, want.Spec.Selector) {
existing.Spec.Selector = want.Spec.Selector
changed = true
}
if !reflect.DeepEqual(existing.Spec.Template.Labels, want.Spec.Template.Labels) {
existing.Spec.Template.Labels = want.Spec.Template.Labels
changed = true
}
if !reflect.DeepEqual(existing.Spec.Template.Spec.ServiceAccountName, want.Spec.Template.Spec.ServiceAccountName) {
existing.Spec.Template.Spec.ServiceAccountName = want.Spec.Template.Spec.ServiceAccountName
changed = true
}
if !reflect.DeepEqual(existing.Spec.Template.Spec.Containers, want.Spec.Template.Spec.Containers) {
existing.Spec.Template.Spec.Containers = want.Spec.Template.Spec.Containers
changed = true
}
if !changed {
return nil
}
_, err = kubeClient.AppsV1().Deployments(namespace).Update(ctx, existing, metav1.UpdateOptions{})
return err
}
func mergeStringMaps(maps ...map[string]string) map[string]string {
var total int
for _, m := range maps {
total += len(m)
}
if total == 0 {
return nil
}
out := make(map[string]string, total)
for _, m := range maps {
for k, v := range m {
out[k] = v
}
}
return out
}
func sortedKeys(m map[string]string) []string {
if len(m) == 0 {
return nil
}
keys := make([]string, 0, len(m))
for k := range m {
keys = append(keys, k)
}
sort.Strings(keys)
return keys
}