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status.go
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status.go
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package op
import (
"context"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/cybozu-go/cke"
"github.com/cybozu-go/log"
"gopkg.in/yaml.v2"
k8serr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// GetNodeStatus returns NodeStatus.
func GetNodeStatus(ctx context.Context, inf cke.Infrastructure, node *cke.Node, cluster *cke.Cluster) (*cke.NodeStatus, error) {
status := &cke.NodeStatus{}
agent := inf.Agent(node.Address)
ce := inf.Engine(node.Address)
ss, err := ce.Inspect([]string{
EtcdContainerName,
RiversContainerName,
KubeAPIServerContainerName,
KubeControllerManagerContainerName,
KubeSchedulerContainerName,
KubeProxyContainerName,
KubeletContainerName,
})
if err != nil {
return nil, err
}
etcdVolumeExists, err := ce.VolumeExists(EtcdVolumeName(cluster.Options.Etcd))
if err != nil {
return nil, err
}
status.Etcd = cke.EtcdStatus{
ServiceStatus: ss[EtcdContainerName],
HasData: etcdVolumeExists,
}
status.Rivers = ss[RiversContainerName]
status.APIServer = cke.KubeComponentStatus{
ServiceStatus: ss[KubeAPIServerContainerName],
IsHealthy: false,
}
if status.APIServer.Running {
status.APIServer.IsHealthy, err = checkAPIServerHealth(ctx, inf, node)
if err != nil {
log.Warn("failed to check API server health", map[string]interface{}{
log.FnError: err,
"node": node.Address,
})
}
}
status.ControllerManager = cke.KubeComponentStatus{
ServiceStatus: ss[KubeControllerManagerContainerName],
IsHealthy: false,
}
if status.ControllerManager.Running {
status.ControllerManager.IsHealthy, err = checkSecureHealthz(ctx, inf, node.Address, 10257)
if err != nil {
log.Warn("failed to check controller manager health", map[string]interface{}{
log.FnError: err,
"node": node.Address,
})
}
}
status.Scheduler = cke.KubeComponentStatus{
ServiceStatus: ss[KubeSchedulerContainerName],
IsHealthy: false,
}
if status.Scheduler.Running {
status.Scheduler.IsHealthy, err = checkSecureHealthz(ctx, inf, node.Address, 10259)
if err != nil {
log.Warn("failed to check scheduler health", map[string]interface{}{
log.FnError: err,
"node": node.Address,
})
}
}
// TODO: doe to the following bug, health status cannot be checked for proxy.
// https://github.com/kubernetes/kubernetes/issues/65118
status.Proxy = cke.KubeComponentStatus{
ServiceStatus: ss[KubeProxyContainerName],
IsHealthy: false,
}
status.Proxy.IsHealthy = status.Proxy.Running
status.Kubelet = cke.KubeletStatus{
ServiceStatus: ss[KubeletContainerName],
IsHealthy: false,
Domain: "",
AllowSwap: false,
}
if status.Kubelet.Running {
status.Kubelet.IsHealthy, err = checkHealthz(ctx, inf, node.Address, 10248)
if err != nil {
log.Warn("failed to check kubelet health", map[string]interface{}{
log.FnError: err,
"node": node.Address,
})
}
cfgData, _, err := agent.Run("cat /etc/kubernetes/kubelet/config.yml")
if err == nil {
v := struct {
ClusterDomain string `yaml:"clusterDomain"`
FailSwapOn bool `yaml:"failSwapOn"`
}{}
err = yaml.Unmarshal(cfgData, &v)
if err == nil {
status.Kubelet.Domain = v.ClusterDomain
status.Kubelet.AllowSwap = !v.FailSwapOn
}
}
}
return status, nil
}
// GetEtcdClusterStatus returns EtcdClusterStatus
func GetEtcdClusterStatus(ctx context.Context, inf cke.Infrastructure, nodes []*cke.Node) (cke.EtcdClusterStatus, error) {
clusterStatus := cke.EtcdClusterStatus{}
var endpoints []string
for _, n := range nodes {
if n.ControlPlane {
endpoints = append(endpoints, fmt.Sprintf("https://%s:2379", n.Address))
}
}
cli, err := inf.NewEtcdClient(ctx, endpoints)
if err != nil {
return clusterStatus, err
}
defer cli.Close()
clusterStatus.Members, err = getEtcdMembers(ctx, inf, cli)
if err != nil {
return clusterStatus, err
}
ct, cancel := context.WithTimeout(ctx, TimeoutDuration)
defer cancel()
resp, err := cli.Grant(ct, 10)
if err != nil {
return clusterStatus, err
}
clusterStatus.IsHealthy = resp.ID != clientv3.NoLease
clusterStatus.InSyncMembers = make(map[string]bool)
for name := range clusterStatus.Members {
clusterStatus.InSyncMembers[name] = getEtcdMemberInSync(ctx, inf, name, resp.Revision)
}
return clusterStatus, nil
}
func getEtcdMembers(ctx context.Context, inf cke.Infrastructure, cli *clientv3.Client) (map[string]*etcdserverpb.Member, error) {
ct, cancel := context.WithTimeout(ctx, TimeoutDuration)
defer cancel()
resp, err := cli.MemberList(ct)
if err != nil {
return nil, err
}
members := make(map[string]*etcdserverpb.Member)
for _, m := range resp.Members {
name, err := guessMemberName(m)
if err != nil {
return nil, err
}
members[name] = m
}
return members, nil
}
func guessMemberName(m *etcdserverpb.Member) (string, error) {
if len(m.Name) > 0 {
return m.Name, nil
}
if len(m.PeerURLs) == 0 {
return "", errors.New("empty PeerURLs")
}
u, err := url.Parse(m.PeerURLs[0])
if err != nil {
return "", err
}
h, _, err := net.SplitHostPort(u.Host)
if err != nil {
return "", err
}
return h, nil
}
func getEtcdMemberInSync(ctx context.Context, inf cke.Infrastructure, address string, clusterRev int64) bool {
endpoints := []string{fmt.Sprintf("https://%s:2379", address)}
cli, err := inf.NewEtcdClient(ctx, endpoints)
if err != nil {
return false
}
defer cli.Close()
ct, cancel := context.WithTimeout(ctx, TimeoutDuration)
defer cancel()
resp, err := cli.Get(ct, "health")
if err != nil {
return false
}
return resp.Header.Revision >= clusterRev
}
// GetKubernetesClusterStatus returns KubernetesClusterStatus
func GetKubernetesClusterStatus(ctx context.Context, inf cke.Infrastructure, n *cke.Node, cluster *cke.Cluster) (cke.KubernetesClusterStatus, error) {
clientset, err := inf.K8sClient(ctx, n)
if err != nil {
return cke.KubernetesClusterStatus{}, err
}
s := cke.KubernetesClusterStatus{}
_, err = clientset.CoreV1().ServiceAccounts("kube-system").Get("default", metav1.GetOptions{})
switch {
case err == nil:
s.IsReady = true
case k8serr.IsNotFound(err):
default:
return cke.KubernetesClusterStatus{}, err
}
resp, err := clientset.CoreV1().Nodes().List(metav1.ListOptions{})
if err != nil {
return cke.KubernetesClusterStatus{}, err
}
s.Nodes = resp.Items
_, err = clientset.RbacV1().ClusterRoles().Get(rbacRoleName, metav1.GetOptions{})
switch {
case err == nil:
s.RBACRoleExists = true
case k8serr.IsNotFound(err):
default:
return cke.KubernetesClusterStatus{}, err
}
_, err = clientset.RbacV1().ClusterRoleBindings().Get(rbacRoleBindingName, metav1.GetOptions{})
switch {
case err == nil:
s.RBACRoleBindingExists = true
case k8serr.IsNotFound(err):
default:
return cke.KubernetesClusterStatus{}, err
}
if len(cluster.DNSService) > 0 {
fields := strings.Split(cluster.DNSService, "/")
if len(fields) != 2 {
panic("invalid dns_service in cluster.yml")
}
svc, err := clientset.CoreV1().Services(fields[0]).Get(fields[1], metav1.GetOptions{})
switch {
case k8serr.IsNotFound(err):
case err == nil:
s.DNSService = svc
default:
return cke.KubernetesClusterStatus{}, err
}
}
s.ClusterDNS, err = getClusterDNSStatus(ctx, inf, n)
if err != nil {
return cke.KubernetesClusterStatus{}, err
}
s.NodeDNS, err = getNodeDNSStatus(ctx, inf, n)
if err != nil {
return cke.KubernetesClusterStatus{}, err
}
s.EtcdBackup, err = getEtcdBackupStatus(ctx, inf, n)
if err != nil {
return cke.KubernetesClusterStatus{}, err
}
ep, err := clientset.CoreV1().Endpoints("kube-system").Get(etcdEndpointsName,
metav1.GetOptions{IncludeUninitialized: true})
switch {
case err == nil:
s.EtcdEndpoints = ep
case k8serr.IsNotFound(err):
default:
return cke.KubernetesClusterStatus{}, err
}
return s, nil
}
func getClusterDNSStatus(ctx context.Context, inf cke.Infrastructure, n *cke.Node) (cke.ClusterDNSStatus, error) {
clientset, err := inf.K8sClient(ctx, n)
if err != nil {
return cke.ClusterDNSStatus{}, err
}
s := cke.ClusterDNSStatus{}
_, err = clientset.CoreV1().ServiceAccounts("kube-system").Get(ClusterDNSAppName, metav1.GetOptions{})
switch {
case err == nil:
s.ServiceAccountExists = true
case k8serr.IsNotFound(err):
default:
return cke.ClusterDNSStatus{}, err
}
_, err = clientset.RbacV1().ClusterRoles().Get(ClusterDNSRBACRoleName, metav1.GetOptions{})
switch {
case err == nil:
s.RBACRoleExists = true
case k8serr.IsNotFound(err):
default:
return cke.ClusterDNSStatus{}, err
}
_, err = clientset.RbacV1().ClusterRoleBindings().Get(ClusterDNSRBACRoleName, metav1.GetOptions{})
switch {
case err == nil:
s.RBACRoleBindingExists = true
case k8serr.IsNotFound(err):
default:
return cke.ClusterDNSStatus{}, err
}
config, err := clientset.CoreV1().ConfigMaps("kube-system").Get(ClusterDNSAppName, metav1.GetOptions{})
switch {
case err == nil:
s.ConfigMap = config
case k8serr.IsNotFound(err):
default:
return cke.ClusterDNSStatus{}, err
}
deployment, err := clientset.AppsV1().Deployments("kube-system").Get(ClusterDNSAppName, metav1.GetOptions{})
switch {
case err == nil:
s.Deployment = deployment
case k8serr.IsNotFound(err):
default:
return cke.ClusterDNSStatus{}, err
}
service, err := clientset.CoreV1().Services("kube-system").Get(ClusterDNSAppName, metav1.GetOptions{})
switch {
case err == nil:
s.ServiceExists = true
s.ClusterIP = service.Spec.ClusterIP
case k8serr.IsNotFound(err):
default:
return cke.ClusterDNSStatus{}, err
}
return s, nil
}
func getNodeDNSStatus(ctx context.Context, inf cke.Infrastructure, n *cke.Node) (cke.NodeDNSStatus, error) {
clientset, err := inf.K8sClient(ctx, n)
if err != nil {
return cke.NodeDNSStatus{}, err
}
s := cke.NodeDNSStatus{}
config, err := clientset.CoreV1().ConfigMaps("kube-system").Get(NodeDNSAppName, metav1.GetOptions{})
switch {
case err == nil:
s.ConfigMap = config
case k8serr.IsNotFound(err):
default:
return cke.NodeDNSStatus{}, err
}
ds, err := clientset.AppsV1().DaemonSets("kube-system").Get(NodeDNSAppName, metav1.GetOptions{})
switch {
case err == nil:
s.DaemonSet = ds
case k8serr.IsNotFound(err):
default:
return cke.NodeDNSStatus{}, err
}
return s, nil
}
func getEtcdBackupStatus(ctx context.Context, inf cke.Infrastructure, n *cke.Node) (cke.EtcdBackupStatus, error) {
clientset, err := inf.K8sClient(ctx, n)
if err != nil {
return cke.EtcdBackupStatus{}, err
}
s := cke.EtcdBackupStatus{}
config, err := clientset.CoreV1().ConfigMaps("kube-system").Get(EtcdBackupAppName, metav1.GetOptions{})
switch {
case err == nil:
s.ConfigMap = config
case k8serr.IsNotFound(err):
default:
return cke.EtcdBackupStatus{}, err
}
pod, err := clientset.CoreV1().Pods("kube-system").Get(EtcdBackupAppName, metav1.GetOptions{})
switch {
case err == nil:
s.Pod = pod
case k8serr.IsNotFound(err):
default:
return cke.EtcdBackupStatus{}, err
}
service, err := clientset.CoreV1().Services("kube-system").Get(EtcdBackupAppName, metav1.GetOptions{})
switch {
case err == nil:
s.Service = service
case k8serr.IsNotFound(err):
default:
return cke.EtcdBackupStatus{}, err
}
secret, err := clientset.CoreV1().Secrets("kube-system").Get(EtcdBackupAppName, metav1.GetOptions{})
switch {
case err == nil:
s.Secret = secret
case k8serr.IsNotFound(err):
default:
return cke.EtcdBackupStatus{}, err
}
job, err := clientset.BatchV1beta1().CronJobs("kube-system").Get(EtcdBackupAppName, metav1.GetOptions{})
switch {
case err == nil:
s.CronJob = job
case k8serr.IsNotFound(err):
default:
return cke.EtcdBackupStatus{}, err
}
return s, nil
}
func checkHealthz(ctx context.Context, inf cke.Infrastructure, addr string, port uint16) (bool, error) {
healthzURL := "http://" + addr + ":" + strconv.FormatUint(uint64(port), 10) + "/healthz"
req, err := http.NewRequest("GET", healthzURL, nil)
if err != nil {
return false, err
}
req = req.WithContext(ctx)
resp, err := inf.HTTPClient().Do(req)
if err != nil {
return false, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return false, err
}
return strings.TrimSpace(string(body)) == "ok", nil
}
func checkSecureHealthz(ctx context.Context, inf cke.Infrastructure, addr string, port uint16) (bool, error) {
healthzURL := "https://" + addr + ":" + strconv.FormatUint(uint64(port), 10) + "/healthz"
req, err := http.NewRequest("GET", healthzURL, nil)
if err != nil {
return false, err
}
req = req.WithContext(ctx)
client, err := inf.HTTPSClient(ctx)
if err != nil {
return false, err
}
resp, err := client.Do(req)
if err != nil {
return false, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return false, err
}
return strings.TrimSpace(string(body)) == "ok", nil
}
func checkAPIServerHealth(ctx context.Context, inf cke.Infrastructure, n *cke.Node) (bool, error) {
clientset, err := inf.K8sClient(ctx, n)
if err != nil {
return false, err
}
_, err = clientset.CoreV1().Namespaces().List(metav1.ListOptions{})
if err != nil {
return false, err
}
return true, nil
}