255 lines
7.7 KiB
Go
255 lines
7.7 KiB
Go
|
/*
|
||
|
|
Copyright 2014 The Kubernetes Authors.
|
||
|
|
|
||
|
|
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 cmd
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"io"
|
||
|
|
"math"
|
||
|
|
"os"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"github.com/spf13/cobra"
|
||
|
|
"k8s.io/apimachinery/pkg/api/meta"
|
||
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
||
|
|
"k8s.io/apimachinery/pkg/runtime"
|
||
|
|
"k8s.io/kubernetes/pkg/api"
|
||
|
|
"k8s.io/kubernetes/pkg/api/validation"
|
||
|
|
"k8s.io/kubernetes/pkg/client/restclient"
|
||
|
|
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
|
||
|
|
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
|
||
|
|
"k8s.io/kubernetes/pkg/kubectl/resource"
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
logs_example = templates.Examples(`
|
||
|
|
# Return snapshot logs from pod nginx with only one container
|
||
|
|
kubectl logs nginx
|
||
|
|
|
||
|
|
# Return snapshot logs for the pods defined by label app=nginx
|
||
|
|
kubectl logs -lapp=nginx
|
||
|
|
|
||
|
|
# Return snapshot of previous terminated ruby container logs from pod web-1
|
||
|
|
kubectl logs -p -c ruby web-1
|
||
|
|
|
||
|
|
# Begin streaming the logs of the ruby container in pod web-1
|
||
|
|
kubectl logs -f -c ruby web-1
|
||
|
|
|
||
|
|
# Display only the most recent 20 lines of output in pod nginx
|
||
|
|
kubectl logs --tail=20 nginx
|
||
|
|
|
||
|
|
# Show all logs from pod nginx written in the last hour
|
||
|
|
kubectl logs --since=1h nginx`)
|
||
|
|
|
||
|
|
selectorTail int64 = 10
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
logsUsageStr = "expected 'logs POD_NAME [CONTAINER_NAME]'.\nPOD_NAME is a required argument for the logs command"
|
||
|
|
)
|
||
|
|
|
||
|
|
type LogsOptions struct {
|
||
|
|
Namespace string
|
||
|
|
ResourceArg string
|
||
|
|
Options runtime.Object
|
||
|
|
|
||
|
|
Mapper meta.RESTMapper
|
||
|
|
Typer runtime.ObjectTyper
|
||
|
|
ClientMapper resource.ClientMapper
|
||
|
|
Decoder runtime.Decoder
|
||
|
|
|
||
|
|
Object runtime.Object
|
||
|
|
LogsForObject func(object, options runtime.Object) (*restclient.Request, error)
|
||
|
|
|
||
|
|
Out io.Writer
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewCmdLog creates a new pod logs command
|
||
|
|
func NewCmdLogs(f cmdutil.Factory, out io.Writer) *cobra.Command {
|
||
|
|
o := &LogsOptions{}
|
||
|
|
cmd := &cobra.Command{
|
||
|
|
Use: "logs [-f] [-p] POD [-c CONTAINER]",
|
||
|
|
Short: "Print the logs for a container in a pod",
|
||
|
|
Long: "Print the logs for a container in a pod. If the pod has only one container, the container name is optional.",
|
||
|
|
Example: logs_example,
|
||
|
|
PreRun: func(cmd *cobra.Command, args []string) {
|
||
|
|
if len(os.Args) > 1 && os.Args[1] == "log" {
|
||
|
|
printDeprecationWarning("logs", "log")
|
||
|
|
}
|
||
|
|
},
|
||
|
|
Run: func(cmd *cobra.Command, args []string) {
|
||
|
|
cmdutil.CheckErr(o.Complete(f, out, cmd, args))
|
||
|
|
if err := o.Validate(); err != nil {
|
||
|
|
cmdutil.CheckErr(cmdutil.UsageError(cmd, err.Error()))
|
||
|
|
}
|
||
|
|
cmdutil.CheckErr(o.RunLogs())
|
||
|
|
},
|
||
|
|
Aliases: []string{"log"},
|
||
|
|
}
|
||
|
|
cmd.Flags().BoolP("follow", "f", false, "Specify if the logs should be streamed.")
|
||
|
|
cmd.Flags().Bool("timestamps", false, "Include timestamps on each line in the log output")
|
||
|
|
cmd.Flags().Int64("limit-bytes", 0, "Maximum bytes of logs to return. Defaults to no limit.")
|
||
|
|
cmd.Flags().BoolP("previous", "p", false, "If true, print the logs for the previous instance of the container in a pod if it exists.")
|
||
|
|
cmd.Flags().Int64("tail", -1, "Lines of recent log file to display. Defaults to -1 with no selector, showing all log lines otherwise 10, if a selector is provided.")
|
||
|
|
cmd.Flags().String("since-time", "", "Only return logs after a specific date (RFC3339). Defaults to all logs. Only one of since-time / since may be used.")
|
||
|
|
cmd.Flags().Duration("since", 0, "Only return logs newer than a relative duration like 5s, 2m, or 3h. Defaults to all logs. Only one of since-time / since may be used.")
|
||
|
|
cmd.Flags().StringP("container", "c", "", "Print the logs of this container")
|
||
|
|
|
||
|
|
cmd.Flags().Bool("interactive", false, "If true, prompt the user for input when required.")
|
||
|
|
cmd.Flags().MarkDeprecated("interactive", "This flag is no longer respected and there is no replacement.")
|
||
|
|
cmdutil.AddInclude3rdPartyFlags(cmd)
|
||
|
|
cmd.Flags().StringP("selector", "l", "", "Selector (label query) to filter on.")
|
||
|
|
return cmd
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *LogsOptions) Complete(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string) error {
|
||
|
|
containerName := cmdutil.GetFlagString(cmd, "container")
|
||
|
|
selector := cmdutil.GetFlagString(cmd, "selector")
|
||
|
|
switch len(args) {
|
||
|
|
case 0:
|
||
|
|
if len(selector) == 0 {
|
||
|
|
return cmdutil.UsageError(cmd, logsUsageStr)
|
||
|
|
}
|
||
|
|
case 1:
|
||
|
|
o.ResourceArg = args[0]
|
||
|
|
if len(selector) != 0 {
|
||
|
|
return cmdutil.UsageError(cmd, "only a selector (-l) or a POD name is allowed")
|
||
|
|
}
|
||
|
|
case 2:
|
||
|
|
if cmd.Flag("container").Changed {
|
||
|
|
return cmdutil.UsageError(cmd, "only one of -c or an inline [CONTAINER] arg is allowed")
|
||
|
|
}
|
||
|
|
o.ResourceArg = args[0]
|
||
|
|
containerName = args[1]
|
||
|
|
default:
|
||
|
|
return cmdutil.UsageError(cmd, logsUsageStr)
|
||
|
|
}
|
||
|
|
var err error
|
||
|
|
o.Namespace, _, err = f.DefaultNamespace()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
logOptions := &api.PodLogOptions{
|
||
|
|
Container: containerName,
|
||
|
|
Follow: cmdutil.GetFlagBool(cmd, "follow"),
|
||
|
|
Previous: cmdutil.GetFlagBool(cmd, "previous"),
|
||
|
|
Timestamps: cmdutil.GetFlagBool(cmd, "timestamps"),
|
||
|
|
}
|
||
|
|
if sinceTime := cmdutil.GetFlagString(cmd, "since-time"); len(sinceTime) > 0 {
|
||
|
|
t, err := api.ParseRFC3339(sinceTime, metav1.Now)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
logOptions.SinceTime = &t
|
||
|
|
}
|
||
|
|
if limit := cmdutil.GetFlagInt64(cmd, "limit-bytes"); limit != 0 {
|
||
|
|
logOptions.LimitBytes = &limit
|
||
|
|
}
|
||
|
|
if tail := cmdutil.GetFlagInt64(cmd, "tail"); tail != -1 {
|
||
|
|
logOptions.TailLines = &tail
|
||
|
|
}
|
||
|
|
if sinceSeconds := cmdutil.GetFlagDuration(cmd, "since"); sinceSeconds != 0 {
|
||
|
|
// round up to the nearest second
|
||
|
|
sec := int64(math.Ceil(float64(sinceSeconds) / float64(time.Second)))
|
||
|
|
logOptions.SinceSeconds = &sec
|
||
|
|
}
|
||
|
|
o.Options = logOptions
|
||
|
|
o.LogsForObject = f.LogsForObject
|
||
|
|
o.ClientMapper = resource.ClientMapperFunc(f.ClientForMapping)
|
||
|
|
o.Out = out
|
||
|
|
|
||
|
|
if len(selector) != 0 {
|
||
|
|
if logOptions.Follow {
|
||
|
|
return cmdutil.UsageError(cmd, "only one of follow (-f) or selector (-l) is allowed")
|
||
|
|
}
|
||
|
|
if len(logOptions.Container) != 0 {
|
||
|
|
return cmdutil.UsageError(cmd, "a container cannot be specified when using a selector (-l)")
|
||
|
|
}
|
||
|
|
if logOptions.TailLines == nil {
|
||
|
|
logOptions.TailLines = &selectorTail
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
mapper, typer := f.Object()
|
||
|
|
decoder := f.Decoder(true)
|
||
|
|
if o.Object == nil {
|
||
|
|
builder := resource.NewBuilder(mapper, typer, o.ClientMapper, decoder).
|
||
|
|
NamespaceParam(o.Namespace).DefaultNamespace().
|
||
|
|
SingleResourceType()
|
||
|
|
if o.ResourceArg != "" {
|
||
|
|
builder.ResourceNames("pods", o.ResourceArg)
|
||
|
|
}
|
||
|
|
if selector != "" {
|
||
|
|
builder.ResourceTypes("pods").SelectorParam(selector)
|
||
|
|
}
|
||
|
|
infos, err := builder.Do().Infos()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if selector == "" && len(infos) != 1 {
|
||
|
|
return errors.New("expected a resource")
|
||
|
|
}
|
||
|
|
o.Object = infos[0].Object
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o LogsOptions) Validate() error {
|
||
|
|
logsOptions, ok := o.Options.(*api.PodLogOptions)
|
||
|
|
if !ok {
|
||
|
|
return errors.New("unexpected logs options object")
|
||
|
|
}
|
||
|
|
if errs := validation.ValidatePodLogOptions(logsOptions); len(errs) > 0 {
|
||
|
|
return errs.ToAggregate()
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// RunLogs retrieves a pod log
|
||
|
|
func (o LogsOptions) RunLogs() error {
|
||
|
|
switch t := o.Object.(type) {
|
||
|
|
case *api.PodList:
|
||
|
|
for _, p := range t.Items {
|
||
|
|
if err := o.getLogs(&p); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
default:
|
||
|
|
return o.getLogs(o.Object)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o LogsOptions) getLogs(obj runtime.Object) error {
|
||
|
|
req, err := o.LogsForObject(obj, o.Options)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
readCloser, err := req.Stream()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
defer readCloser.Close()
|
||
|
|
|
||
|
|
_, err = io.Copy(o.Out, readCloser)
|
||
|
|
return err
|
||
|
|
}
|