minikube/pkg/minikube/node/machine.go

/*
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 node

import (
	"fmt"
	"net"
	"os"
	"os/exec"
	"strings"
	"time"

	"github.com/docker/machine/libmachine"
	"github.com/docker/machine/libmachine/host"
	"github.com/golang/glog"
	"github.com/spf13/viper"
	"k8s.io/minikube/pkg/minikube/bootstrapper/images"
	"k8s.io/minikube/pkg/minikube/command"
	"k8s.io/minikube/pkg/minikube/config"
	"k8s.io/minikube/pkg/minikube/driver"
	"k8s.io/minikube/pkg/minikube/exit"
	"k8s.io/minikube/pkg/minikube/machine"
	"k8s.io/minikube/pkg/minikube/out"
	"k8s.io/minikube/pkg/minikube/proxy"
	"k8s.io/minikube/pkg/util/retry"
)

func startMachine(cfg *config.ClusterConfig, node *config.Node) (runner command.Runner, preExists bool, machineAPI libmachine.API, host *host.Host) {
	m, err := machine.NewAPIClient()
	if err != nil {
		exit.WithError("Failed to get machine client", err)
	}
	host, preExists = startHost(m, *cfg)
	runner, err = machine.CommandRunner(host)
	if err != nil {
		exit.WithError("Failed to get command runner", err)
	}

	ip := validateNetwork(host, runner)

	// Bypass proxy for minikube's vm host ip
	err = proxy.ExcludeIP(ip)
	if err != nil {
		out.ErrT(out.FailureType, "Failed to set NO_PROXY Env. Please use `export NO_PROXY=$NO_PROXY,{{.ip}}`.", out.V{"ip": ip})
	}
	// Save IP to configuration file for subsequent use
	node.IP = ip

	if err := Save(cfg, node); err != nil {
		exit.WithError("Failed to save config", err)
	}

	return runner, preExists, m, host
}

// startHost starts a new minikube host using a VM or None
func startHost(api libmachine.API, mc config.ClusterConfig) (*host.Host, bool) {
	exists, err := api.Exists(mc.Name)
	if err != nil {
		exit.WithError("Failed to check if machine exists", err)
	}

	host, err := machine.StartHost(api, mc)
	if err != nil {
		exit.WithError("Unable to start VM. Please investigate and run 'minikube delete' if possible", err)
	}
	return host, exists
}

// validateNetwork tries to catch network problems as soon as possible
func validateNetwork(h *host.Host, r command.Runner) string {
	ip, err := h.Driver.GetIP()
	if err != nil {
		exit.WithError("Unable to get VM IP address", err)
	}

	optSeen := false
	warnedOnce := false
	for _, k := range proxy.EnvVars {
		if v := os.Getenv(k); v != "" {
			if !optSeen {
				out.T(out.Internet, "Found network options:")
				optSeen = true
			}
			out.T(out.Option, "{{.key}}={{.value}}", out.V{"key": k, "value": v})
			ipExcluded := proxy.IsIPExcluded(ip) // Skip warning if minikube ip is already in NO_PROXY
			k = strings.ToUpper(k)               // for http_proxy & https_proxy
			if (k == "HTTP_PROXY" || k == "HTTPS_PROXY") && !ipExcluded && !warnedOnce {
				out.WarningT("You appear to be using a proxy, but your NO_PROXY environment does not include the minikube IP ({{.ip_address}}). Please see {{.documentation_url}} for more details", out.V{"ip_address": ip, "documentation_url": "https://minikube.sigs.k8s.io/docs/reference/networking/proxy/"})
				warnedOnce = true
			}
		}
	}

	if !driver.BareMetal(h.Driver.DriverName()) && !driver.IsKIC(h.Driver.DriverName()) {
		trySSH(h, ip)
	}

	tryLookup(r)
	tryRegistry(r)
	return ip
}

func trySSH(h *host.Host, ip string) {
	if viper.GetBool("force") {
		return
	}

	sshAddr := net.JoinHostPort(ip, "22")

	dial := func() (err error) {
		d := net.Dialer{Timeout: 3 * time.Second}
		conn, err := d.Dial("tcp", sshAddr)
		if err != nil {
			out.WarningT("Unable to verify SSH connectivity: {{.error}}. Will retry...", out.V{"error": err})
			return err
		}
		_ = conn.Close()
		return nil
	}

	if err := retry.Expo(dial, time.Second, 13*time.Second); err != nil {
		exit.WithCodeT(exit.IO, `minikube is unable to connect to the VM: {{.error}}

	This is likely due to one of two reasons:

	- VPN or firewall interference
	- {{.hypervisor}} network configuration issue

	Suggested workarounds:

	- Disable your local VPN or firewall software
	- Configure your local VPN or firewall to allow access to {{.ip}}
	- Restart or reinstall {{.hypervisor}}
	- Use an alternative --driver
	- Use --force to override this connectivity check
	`, out.V{"error": err, "hypervisor": h.Driver.DriverName(), "ip": ip})
	}
}

func tryLookup(r command.Runner) {
	// DNS check
	if rr, err := r.RunCmd(exec.Command("nslookup", "-type=ns", "kubernetes.io")); err != nil {
		glog.Infof("%s failed: %v which might be okay will retry nslookup without query type", rr.Args, err)
		// will try with without query type for ISOs with different busybox versions.
		if _, err = r.RunCmd(exec.Command("nslookup", "kubernetes.io")); err != nil {
			glog.Warningf("nslookup failed: %v", err)
			// try with the older "host" command, instead of the newer "nslookup"
			if _, err = r.RunCmd(exec.Command("host", "kubernetes.io")); err != nil {
				out.WarningT("Node may be unable to resolve external DNS records")
			}
		}
	}
}
func tryRegistry(r command.Runner) {
	// Try an HTTPS connection to the image repository
	proxy := os.Getenv("HTTPS_PROXY")
	opts := []string{"-sS"}
	if proxy != "" && !strings.HasPrefix(proxy, "localhost") && !strings.HasPrefix(proxy, "127.0") {
		opts = append([]string{"-x", proxy}, opts...)
	}

	repo := viper.GetString(imageRepository)
	if repo == "" {
		repo = images.DefaultKubernetesRepo
	}

	opts = append(opts, fmt.Sprintf("https://%s/", repo))
	if rr, err := r.RunCmd(exec.Command("curl", opts...)); err != nil {
		glog.Warningf("%s failed: %v", rr.Args, err)
		out.WarningT("VM is unable to access {{.repository}}, you may need to configure a proxy or set --image-repository", out.V{"repository": repo})
	}
}