--wait, wait for more components

cmd/minikube/cmd/start.go

@@ -44,6 +44,7 @@ import (
 	cmdcfg "k8s.io/minikube/cmd/minikube/cmd/config"
 	"k8s.io/minikube/pkg/drivers/kic/oci"
 	"k8s.io/minikube/pkg/minikube/bootstrapper/bsutil"
+	"k8s.io/minikube/pkg/minikube/bootstrapper/bsutil/kverify"
 	"k8s.io/minikube/pkg/minikube/bootstrapper/images"
 	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/constants"
@@ -109,7 +110,7 @@ const (
 	downloadOnly            = "download-only"
 	dnsProxy                = "dns-proxy"
 	hostDNSResolver         = "host-dns-resolver"
-	waitUntilHealthy        = "wait"
+	waitComponents          = "wait"
 	force                   = "force"
 	dryRun                  = "dry-run"
 	interactive             = "interactive"
@@ -171,7 +172,7 @@ func initMinikubeFlags() {
 	startCmd.Flags().String(criSocket, "", "The cri socket path to be used.")
 	startCmd.Flags().String(networkPlugin, "", "The name of the network plugin.")
 	startCmd.Flags().Bool(enableDefaultCNI, false, "Enable the default CNI plugin (/etc/cni/net.d/k8s.conf). Used in conjunction with \"--network-plugin=cni\".")
-	startCmd.Flags().Bool(waitUntilHealthy, true, "Block until the apiserver is servicing API requests")
+	startCmd.Flags().StringSlice(waitComponents, kverify.DefaultWaitList, fmt.Sprintf("comma separated list of kubernetes components to verify and wait for after starting a cluster. defaults to %q, available options: %q . other acceptable values are 'all' or 'none', 'true' and 'false'", strings.Join(kverify.DefaultWaitList, ","), strings.Join(kverify.AllComponentsList, ",")))
 	startCmd.Flags().Duration(waitTimeout, 6*time.Minute, "max time to wait per Kubernetes core services to be healthy.")
 	startCmd.Flags().Bool(nativeSSH, true, "Use native Golang SSH client (default true). Set to 'false' to use the command line 'ssh' command when accessing the docker machine. Useful for the machine drivers when they will not start with 'Waiting for SSH'.")
 	startCmd.Flags().Bool(autoUpdate, true, "If set, automatically updates drivers to the latest version. Defaults to true.")
@@ -1068,6 +1069,7 @@ func createNode(cmd *cobra.Command, k8sVersion, kubeNodeName, drvName, repositor
 		},
 		Nodes: []config.Node{cp},
 	}
+	cfg.VerifyComponents = interpretWaitFlag(*cmd)
 	return cfg, cp, nil
 }
 
@@ -1200,3 +1202,48 @@ func getKubernetesVersion(old *config.ClusterConfig) string {
 	}
 	return nv
 }
+
+// interpretWaitFlag interprets the wait flag and respects the legacy minikube users
+// returns map of components to wait for
+func interpretWaitFlag(cmd cobra.Command) map[string]bool {
+	if !cmd.Flags().Changed(waitComponents) {
+		glog.Infof("Wait components to verify : %+v", kverify.DefaultComponents)
+		return kverify.DefaultComponents
+	}
+
+	waitFlags, err := cmd.Flags().GetStringSlice(waitComponents)
+	if err != nil {
+		glog.Warningf("Failed to read --wait from flags: %v.\n Moving on will use the default wait components: %+v", err, kverify.DefaultComponents)
+		return kverify.DefaultComponents
+	}
+
+	if len(waitFlags) == 1 {
+		// respecting legacy flag before minikube 1.9.0, wait flag was boolean
+		if waitFlags[0] == "false" || waitFlags[0] == "none" {
+			glog.Infof("Waiting for no components: %+v", kverify.NoComponents)
+			return kverify.NoComponents
+		}
+		// respecting legacy flag before minikube 1.9.0, wait flag was boolean
+		if waitFlags[0] == "true" || waitFlags[0] == "all" {
+			glog.Infof("Waiting for all components: %+v", kverify.AllComponents)
+			return kverify.AllComponents
+		}
+	}
+
+	waitComponents := kverify.NoComponents
+	for _, wc := range waitFlags {
+		seen := false
+		for _, valid := range kverify.AllComponentsList {
+			if wc == valid {
+				waitComponents[wc] = true
+				seen = true
+				continue
+			}
+		}
+		if !seen {
+			glog.Warningf("The value %q is invalid for --wait flag. valid options are %q", wc, strings.Join(kverify.AllComponentsList, ","))
+		}
+	}
+	glog.Infof("Waiting for components: %+v", waitComponents)
+	return waitComponents
+}

pkg/minikube/bootstrapper/bsutil/kverify/api_server.go

@@ -0,0 +1,206 @@
+/*
+Copyright 2020 The Kubernetes Authors All rights reserved.
+
+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 kverify verifies a running kubernetes cluster is healthy
+package kverify
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+	"os/exec"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/docker/machine/libmachine/state"
+	"github.com/golang/glog"
+	"github.com/pkg/errors"
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/apimachinery/pkg/version"
+	"k8s.io/client-go/kubernetes"
+	kconst "k8s.io/kubernetes/cmd/kubeadm/app/constants"
+	"k8s.io/minikube/pkg/minikube/bootstrapper"
+	"k8s.io/minikube/pkg/minikube/command"
+	"k8s.io/minikube/pkg/minikube/config"
+	"k8s.io/minikube/pkg/minikube/cruntime"
+)
+
+// WaitForAPIServerProcess waits for api server to be healthy returns error if it doesn't
+func WaitForAPIServerProcess(r cruntime.Manager, bs bootstrapper.Bootstrapper, cfg config.ClusterConfig, cr command.Runner, start time.Time, timeout time.Duration) error {
+	glog.Infof("waiting for apiserver process to appear ...")
+	err := wait.PollImmediate(time.Millisecond*500, timeout, func() (bool, error) {
+		if time.Since(start) > timeout {
+			return false, fmt.Errorf("cluster wait timed out during process check")
+		}
+
+		if time.Since(start) > minLogCheckTime {
+			announceProblems(r, bs, cfg, cr)
+			time.Sleep(kconst.APICallRetryInterval * 5)
+		}
+
+		if _, ierr := apiServerPID(cr); ierr != nil {
+			return false, nil
+		}
+
+		return true, nil
+	})
+	if err != nil {
+		return fmt.Errorf("apiserver process never appeared")
+	}
+	glog.Infof("duration metric: took %s to wait for apiserver process to appear ...", time.Since(start))
+	return nil
+}
+
+// apiServerPID returns our best guess to the apiserver pid
+func apiServerPID(cr command.Runner) (int, error) {
+	rr, err := cr.RunCmd(exec.Command("sudo", "pgrep", "-xnf", "kube-apiserver.*minikube.*"))
+	if err != nil {
+		return 0, err
+	}
+	s := strings.TrimSpace(rr.Stdout.String())
+	return strconv.Atoi(s)
+}
+
+// WaitForHealthyAPIServer waits for api server status to be running
+func WaitForHealthyAPIServer(r cruntime.Manager, bs bootstrapper.Bootstrapper, cfg config.ClusterConfig, cr command.Runner, client *kubernetes.Clientset, start time.Time, hostname string, port int, timeout time.Duration) error {
+	glog.Infof("waiting for apiserver healthz status ...")
+	hStart := time.Now()
+
+	healthz := func() (bool, error) {
+		if time.Since(start) > timeout {
+			return false, fmt.Errorf("cluster wait timed out during healthz check")
+		}
+
+		if time.Since(start) > minLogCheckTime {
+			announceProblems(r, bs, cfg, cr)
+			time.Sleep(kconst.APICallRetryInterval * 5)
+		}
+
+		status, err := apiServerHealthz(hostname, port)
+		if err != nil {
+			glog.Warningf("status: %v", err)
+			return false, nil
+		}
+		if status != state.Running {
+			return false, nil
+		}
+		return true, nil
+	}
+
+	if err := wait.PollImmediate(kconst.APICallRetryInterval, kconst.DefaultControlPlaneTimeout, healthz); err != nil {
+		return fmt.Errorf("apiserver healthz never reported healthy")
+	}
+
+	vcheck := func() (bool, error) {
+		if time.Since(start) > timeout {
+			return false, fmt.Errorf("cluster wait timed out during version check")
+		}
+		if err := APIServerVersionMatch(client, cfg.KubernetesConfig.KubernetesVersion); err != nil {
+			glog.Warningf("api server version match failed: %v", err)
+			return false, nil
+		}
+		return true, nil
+	}
+
+	if err := wait.PollImmediate(kconst.APICallRetryInterval, kconst.DefaultControlPlaneTimeout, vcheck); err != nil {
+		return fmt.Errorf("controlPlane never updated to %s", cfg.KubernetesConfig.KubernetesVersion)
+	}
+
+	glog.Infof("duration metric: took %s to wait for apiserver health ...", time.Since(hStart))
+	return nil
+}
+
+// APIServerVersionMatch checks if the server version matches the expected
+func APIServerVersionMatch(client *kubernetes.Clientset, expected string) error {
+	vi, err := client.ServerVersion()
+	if err != nil {
+		return errors.Wrap(err, "server version")
+	}
+	glog.Infof("control plane version: %s", vi)
+	if version.CompareKubeAwareVersionStrings(vi.String(), expected) != 0 {
+		return fmt.Errorf("controlPane = %q, expected: %q", vi.String(), expected)
+	}
+	return nil
+}
+
+// APIServerStatus returns apiserver status in libmachine style state.State
+func APIServerStatus(cr command.Runner, hostname string, port int) (state.State, error) {
+	glog.Infof("Checking apiserver status ...")
+
+	pid, err := apiServerPID(cr)
+	if err != nil {
+		glog.Warningf("stopped: unable to get apiserver pid: %v", err)
+		return state.Stopped, nil
+	}
+
+	// Get the freezer cgroup entry for this pid
+	rr, err := cr.RunCmd(exec.Command("sudo", "egrep", "^[0-9]+:freezer:", fmt.Sprintf("/proc/%d/cgroup", pid)))
+	if err != nil {
+		glog.Warningf("unable to find freezer cgroup: %v", err)
+		return apiServerHealthz(hostname, port)
+
+	}
+	freezer := strings.TrimSpace(rr.Stdout.String())
+	glog.Infof("apiserver freezer: %q", freezer)
+	fparts := strings.Split(freezer, ":")
+	if len(fparts) != 3 {
+		glog.Warningf("unable to parse freezer - found %d parts: %s", len(fparts), freezer)
+		return apiServerHealthz(hostname, port)
+	}
+
+	rr, err = cr.RunCmd(exec.Command("sudo", "cat", path.Join("/sys/fs/cgroup/freezer", fparts[2], "freezer.state")))
+	if err != nil {
+		glog.Errorf("unable to get freezer state: %s", rr.Stderr.String())
+		return apiServerHealthz(hostname, port)
+	}
+
+	fs := strings.TrimSpace(rr.Stdout.String())
+	glog.Infof("freezer state: %q", fs)
+	if fs == "FREEZING" || fs == "FROZEN" {
+		return state.Paused, nil
+	}
+	return apiServerHealthz(hostname, port)
+}
+
+// apiServerHealthz hits the /healthz endpoint and returns libmachine style state.State
+func apiServerHealthz(hostname string, port int) (state.State, error) {
+	url := fmt.Sprintf("https://%s/healthz", net.JoinHostPort(hostname, fmt.Sprint(port)))
+	glog.Infof("Checking apiserver healthz at %s ...", url)
+	// To avoid: x509: certificate signed by unknown authority
+	tr := &http.Transport{
+		Proxy:           nil, // To avoid connectiv issue if http(s)_proxy is set.
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+	}
+	client := &http.Client{Transport: tr}
+	resp, err := client.Get(url)
+	// Connection refused, usually.
+	if err != nil {
+		glog.Infof("stopped: %s: %v", url, err)
+		return state.Stopped, nil
+	}
+	if resp.StatusCode == http.StatusUnauthorized {
+		glog.Errorf("%s returned code %d (unauthorized). Please ensure that your apiserver authorization settings make sense!", url, resp.StatusCode)
+		return state.Error, nil
+	}
+	if resp.StatusCode != http.StatusOK {
+		glog.Warningf("%s response: %v %+v", url, err, resp)
+		return state.Error, nil
+	}
+	return state.Running, nil
+}

pkg/minikube/bootstrapper/bsutil/kverify/default_sa.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2020 The Kubernetes Authors All rights reserved.
+
+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 kverify verifies a running kubernetes cluster is healthy
+package kverify
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/golang/glog"
+	"github.com/pkg/errors"
+	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/minikube/pkg/util/retry"
+)
+
+// WaitForDefaultSA waits for the default service account to be created.
+func WaitForDefaultSA(cs *kubernetes.Clientset, timeout time.Duration) error {
+	glog.Info("waiting for default service account to be created ...")
+	start := time.Now()
+	saReady := func() error {
+		// equivalent to manual check of 'kubectl --context profile get serviceaccount default'
+		sas, err := cs.CoreV1().ServiceAccounts("default").List(meta.ListOptions{})
+		if err != nil {
+			glog.Infof("temproary error waiting for default SA: %v", err)
+			return err
+		}
+		for _, sa := range sas.Items {
+			if sa.Name == "default" {
+				glog.Infof("found service account: %q", sa.Name)
+				return nil
+			}
+		}
+		return fmt.Errorf("couldn't find default service account")
+	}
+	if err := retry.Expo(saReady, 500*time.Millisecond, timeout); err != nil {
+		return errors.Wrapf(err, "waited %s for SA", time.Since(start))
+	}
+
+	glog.Infof("duration metric: took %s for default service account to be created ...", time.Since(start))
+	return nil
+}