package set
import (
"fmt"
"io"
"net"
"net/url"
"os"
"strconv"
"strings"
"github.com/spf13/cobra"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/meta"
"k8s.io/kubernetes/pkg/api/unversioned"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/util/intstr"
"github.com/openshift/origin/pkg/cmd/templates"
cmdutil "github.com/openshift/origin/pkg/cmd/util"
"github.com/openshift/origin/pkg/cmd/util/clientcmd"
)
var (
probeLong = templates.LongDesc(`
Set or remove a liveness or readiness probe from a pod or pod template
Each container in a pod may define one or more probes that are used for general health
checking. A liveness probe is checked periodically to ensure the container is still healthy:
if the probe fails, the container is restarted. Readiness probes set or clear the ready
flag for each container, which controls whether the container's ports are included in the list
of endpoints for a service and whether a deployment can proceed. A readiness check should
indicate when your container is ready to accept incoming traffic or begin handling work.
Setting both liveness and readiness probes for each container is highly recommended.
The three probe types are:
1. Open a TCP socket on the pod IP
2. Perform an HTTP GET against a URL on a container that must return 200 OK
3. Run a command in the container that must return exit code 0
Containers that take a variable amount of time to start should set generous
initial-delay-seconds values, otherwise as your application evolves you may suddenly begin
to fail.`)
probeExample = templates.Examples(`
# Clear both readiness and liveness probes off all containers
%[1]s probe dc/registry --remove --readiness --liveness
# Set an exec action as a liveness probe to run 'echo ok'
%[1]s probe dc/registry --liveness -- echo ok
# Set a readiness probe to try to open a TCP socket on 3306
%[1]s probe rc/mysql --readiness --open-tcp=3306
# Set an HTTP readiness probe for port 8080 and path /healthz over HTTP on the pod IP
%[1]s probe dc/webapp --readiness --get-url=http://:8080/healthz
# Set an HTTP readiness probe over HTTPS on 127.0.0.1 for a hostNetwork pod
%[1]s probe dc/router --readiness --get-url=https://127.0.0.1:1936/stats
# Set only the initial-delay-seconds field on all deployments
%[1]s probe dc --all --readiness --initial-delay-seconds=30`)
)
type ProbeOptions struct {
Out io.Writer
Err io.Writer
Filenames []string
ContainerSelector string
Selector string
All bool
Builder *resource.Builder
Infos []*resource.Info
Encoder runtime.Encoder
ShortOutput bool
Mapper meta.RESTMapper
OutputVersion unversioned.GroupVersion
PrintObject func([]*resource.Info) error
UpdatePodSpecForObject func(runtime.Object, func(spec *kapi.PodSpec) error) (bool, error)
Readiness bool
Liveness bool
Remove bool
OpenTCPSocket string
HTTPGet string
Command []string
FlagSet func(string) bool
HTTPGetAction *kapi.HTTPGetAction
// Length of time before health checking is activated. In seconds.
InitialDelaySeconds *int
// Length of time before health checking times out. In seconds.
TimeoutSeconds *int
// How often (in seconds) to perform the probe.
PeriodSeconds *int
// Minimum consecutive successes for the probe to be considered successful after having failed.
// Must be 1 for liveness.
SuccessThreshold *int
// Minimum consecutive failures for the probe to be considered failed after having succeeded.
FailureThreshold *int
}
// NewCmdProbe implements the set probe command
func NewCmdProbe(fullName string, f *clientcmd.Factory, out, errOut io.Writer) *cobra.Command {
options := &ProbeOptions{
Out: out,
Err: errOut,
ContainerSelector: "*",
}
cmd := &cobra.Command{
Use: "probe RESOURCE/NAME --readiness|--liveness [options] (--get-url=URL|--open-tcp=PORT|-- CMD)",
Short: "Update a probe on a pod template",
Long: probeLong,
Example: fmt.Sprintf(probeExample, fullName),
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(options.Complete(f, cmd, args))
kcmdutil.CheckErr(options.Validate())
if err := options.Run(); err != nil {
// TODO: move me to kcmdutil
if err == cmdutil.ErrExit {
os.Exit(1)
}
kcmdutil.CheckErr(err)
}
},
}
kcmdutil.AddPrinterFlags(cmd)
cmd.Flags().StringVarP(&options.ContainerSelector, "containers", "c", options.ContainerSelector, "The names of containers in the selected pod templates to change - may use wildcards")
cmd.Flags().StringVarP(&options.Selector, "selector", "l", options.Selector, "Selector (label query) to filter on")
cmd.Flags().BoolVar(&options.All, "all", options.All, "If true, select all resources in the namespace of the specified resource types")
cmd.Flags().StringSliceVarP(&options.Filenames, "filename", "f", options.Filenames, "Filename, directory, or URL to file to use to edit the resource.")
cmd.Flags().BoolVar(&options.Remove, "remove", options.Remove, "If true, remove the specified probe(s).")
cmd.Flags().BoolVar(&options.Readiness, "readiness", options.Readiness, "Set or remove a readiness probe to indicate when this container should receive traffic")
cmd.Flags().BoolVar(&options.Liveness, "liveness", options.Liveness, "Set or remove a liveness probe to verify this container is running")
cmd.Flags().StringVar(&options.OpenTCPSocket, "open-tcp", options.OpenTCPSocket, "A port number or port name to attempt to open via TCP.")
cmd.Flags().StringVar(&options.HTTPGet, "get-url", options.HTTPGet, "A URL to perform an HTTP GET on (you can omit the host, have a string port, or omit the scheme.")
options.InitialDelaySeconds = cmd.Flags().Int("initial-delay-seconds", 0, "The time in seconds to wait before the probe begins checking")
options.SuccessThreshold = cmd.Flags().Int("success-threshold", 0, "The number of successes required before the probe is considered successful")
options.FailureThreshold = cmd.Flags().Int("failure-threshold", 0, "The number of failures before the probe is considered to have failed")
options.PeriodSeconds = cmd.Flags().Int("period-seconds", 0, "The time in seconds between attempts")
options.TimeoutSeconds = cmd.Flags().Int("timeout-seconds", 0, "The time in seconds to wait before considering the probe to have failed")
cmd.MarkFlagFilename("filename", "yaml", "yml", "json")
return cmd
}
func (o *ProbeOptions) Complete(f *clientcmd.Factory, cmd *cobra.Command, args []string) error {
resources := args
if i := cmd.ArgsLenAtDash(); i != -1 {
resources = args[:i]
o.Command = args[i:]
}
if len(o.Filenames) == 0 && len(args) < 1 {
return kcmdutil.UsageError(cmd, "one or more resources must be specified as <resource> <name> or <resource>/<name>")
}
cmdNamespace, explicit, err := f.DefaultNamespace()
if err != nil {
return err
}
clientConfig, err := f.ClientConfig()
if err != nil {
return err
}
o.OutputVersion, err = kcmdutil.OutputVersion(cmd, clientConfig.GroupVersion)
if err != nil {
return err
}
mapper, typer := f.Object(false)
o.Builder = resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.ClientForMapping), kapi.Codecs.UniversalDecoder()).
ContinueOnError().
NamespaceParam(cmdNamespace).DefaultNamespace().
FilenameParam(explicit, false, o.Filenames...).
SelectorParam(o.Selector).
ResourceTypeOrNameArgs(o.All, resources...).
Flatten()
output := kcmdutil.GetFlagString(cmd, "output")
if len(output) > 0 {
o.PrintObject = func(infos []*resource.Info) error {
return f.PrintResourceInfos(cmd, infos, o.Out)
}
}
o.Encoder = f.JSONEncoder()
o.UpdatePodSpecForObject = f.UpdatePodSpecForObject
o.ShortOutput = kcmdutil.GetFlagString(cmd, "output") == "name"
o.Mapper = mapper
if !cmd.Flags().Lookup("initial-delay-seconds").Changed {
o.InitialDelaySeconds = nil
}
if !cmd.Flags().Lookup("timeout-seconds").Changed {
o.TimeoutSeconds = nil
}
if !cmd.Flags().Lookup("period-seconds").Changed {
o.PeriodSeconds = nil
}
if !cmd.Flags().Lookup("success-threshold").Changed {
o.SuccessThreshold = nil
}
if !cmd.Flags().Lookup("failure-threshold").Changed {
o.FailureThreshold = nil
}
if len(o.HTTPGet) > 0 {
url, err := url.Parse(o.HTTPGet)
if err != nil {
return fmt.Errorf("--get-url could not be parsed as a valid URL: %v", err)
}
var host, port string
if strings.Contains(url.Host, ":") {
if host, port, err = net.SplitHostPort(url.Host); err != nil {
return fmt.Errorf("--get-url did not have a valid port specification: %v", err)
}
}
if host == "localhost" {
host = ""
}
o.HTTPGetAction = &kapi.HTTPGetAction{
Scheme: kapi.URIScheme(strings.ToUpper(url.Scheme)),
Host: host,
Port: intOrString(port),
Path: url.Path,
}
}
return nil
}
func (o *ProbeOptions) Validate() error {
if !o.Readiness && !o.Liveness {
return fmt.Errorf("you must specify one of --readiness or --liveness or both")
}
count := 0
if o.Command != nil {
count++
}
if len(o.OpenTCPSocket) > 0 {
count++
}
if len(o.HTTPGet) > 0 {
count++
}
switch {
case o.Remove && count != 0:
return fmt.Errorf("--remove may not be used with any flag except --readiness or --liveness")
case count > 1:
return fmt.Errorf("you may only set one of --get-url, --open-tcp, or command")
case len(o.OpenTCPSocket) > 0 && intOrString(o.OpenTCPSocket).IntVal > 65535:
return fmt.Errorf("--open-tcp must be a port number between 1 and 65535 or an IANA port name")
}
if o.FailureThreshold != nil && *o.FailureThreshold < 1 {
return fmt.Errorf("--failure-threshold may not be less than one")
}
if o.SuccessThreshold != nil && *o.SuccessThreshold < 1 {
return fmt.Errorf("--success-threshold may not be less than one")
}
if o.InitialDelaySeconds != nil && *o.InitialDelaySeconds < 0 {
return fmt.Errorf("--initial-delay-seconds may not be negative")
}
if o.TimeoutSeconds != nil && *o.TimeoutSeconds < 0 {
return fmt.Errorf("--timeout-seconds may not be negative")
}
if o.PeriodSeconds != nil && *o.PeriodSeconds < 0 {
return fmt.Errorf("--period-seconds may not be negative")
}
return nil
}
func (o *ProbeOptions) Run() error {
infos := o.Infos
singular := len(o.Infos) <= 1
if o.Builder != nil {
loaded, err := o.Builder.Do().IntoSingular(&singular).Infos()
if err != nil {
return err
}
infos = loaded
}
patches := CalculatePatches(infos, o.Encoder, func(info *resource.Info) (bool, error) {
transformed := false
_, err := o.UpdatePodSpecForObject(info.Object, func(spec *kapi.PodSpec) error {
containers, _ := selectContainers(spec.Containers, o.ContainerSelector)
if len(containers) == 0 {
fmt.Fprintf(o.Err, "warning: %s/%s does not have any containers matching %q\n", info.Mapping.Resource, info.Name, o.ContainerSelector)
return nil
}
// perform updates
transformed = true
for _, container := range containers {
o.updateContainer(container)
}
return nil
})
return transformed, err
})
if singular && len(patches) == 0 {
return fmt.Errorf("%s/%s is not a pod or does not have a pod template", infos[0].Mapping.Resource, infos[0].Name)
}
if o.PrintObject != nil {
return o.PrintObject(infos)
}
failed := false
for _, patch := range patches {
info := patch.Info
if patch.Err != nil {
fmt.Fprintf(o.Err, "error: %s/%s %v\n", info.Mapping.Resource, info.Name, patch.Err)
continue
}
if string(patch.Patch) == "{}" || len(patch.Patch) == 0 {
fmt.Fprintf(o.Err, "info: %s %q was not changed\n", info.Mapping.Resource, info.Name)
continue
}
obj, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, kapi.StrategicMergePatchType, patch.Patch)
if err != nil {
handlePodUpdateError(o.Err, err, "probes")
failed = true
continue
}
info.Refresh(obj, true)
kcmdutil.PrintSuccess(o.Mapper, o.ShortOutput, o.Out, info.Mapping.Resource, info.Name, false, "updated")
}
if failed {
return cmdutil.ErrExit
}
return nil
}
func (o *ProbeOptions) updateContainer(container *kapi.Container) {
if o.Remove {
if o.Readiness {
container.ReadinessProbe = nil
}
if o.Liveness {
container.LivenessProbe = nil
}
return
}
if o.Readiness {
if container.ReadinessProbe == nil {
container.ReadinessProbe = &kapi.Probe{}
}
o.updateProbe(container.ReadinessProbe)
}
if o.Liveness {
if container.LivenessProbe == nil {
container.LivenessProbe = &kapi.Probe{}
}
o.updateProbe(container.LivenessProbe)
}
}
// updateProbe updates only those fields with flags set by the user
func (o *ProbeOptions) updateProbe(probe *kapi.Probe) {
switch {
case o.Command != nil:
probe.Handler = kapi.Handler{Exec: &kapi.ExecAction{Command: o.Command}}
case o.HTTPGetAction != nil:
probe.Handler = kapi.Handler{HTTPGet: o.HTTPGetAction}
case len(o.OpenTCPSocket) > 0:
probe.Handler = kapi.Handler{TCPSocket: &kapi.TCPSocketAction{Port: intOrString(o.OpenTCPSocket)}}
}
if o.InitialDelaySeconds != nil {
probe.InitialDelaySeconds = int32(*o.InitialDelaySeconds)
}
if o.SuccessThreshold != nil {
probe.SuccessThreshold = int32(*o.SuccessThreshold)
}
if o.FailureThreshold != nil {
probe.FailureThreshold = int32(*o.FailureThreshold)
}
if o.TimeoutSeconds != nil {
probe.TimeoutSeconds = int32(*o.TimeoutSeconds)
}
if o.PeriodSeconds != nil {
probe.PeriodSeconds = int32(*o.PeriodSeconds)
}
}
func intOrString(s string) intstr.IntOrString {
if i, err := strconv.Atoi(s); err == nil {
return intstr.FromInt(i)
}
return intstr.FromString(s)
}