d12696c20f
Provide an administrator a streaming view of journal logs on Linux systems using journalctl, and event logs on Windows systems using the Get-WinEvent PowerShell cmdlet without them having to implement a client side reader. Only available to cluster admins. The implementation for journald on Linux was originally done by Clayton Coleman. Introduce a heuristics approach to query logs The logs query for node objects will follow a heuristics approach when asked to query for logs from a service. If asked to get the logs from a service foobar, it will first check if foobar logs to the native OS service log provider. If unable to get logs from these, it will attempt to get logs from /var/foobar, /var/log/foobar.log or /var/log/foobar/foobar.log in that order. The logs sub-command can also directly serve a file if the query looks like a file. Co-authored-by: Clayton Coleman <ccoleman@redhat.com> Co-authored-by: Christian Glombek <cglombek@redhat.com>
87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
//go:build windows
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/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"context"
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"fmt"
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"os/exec"
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"strings"
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)
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const powershellExe = "PowerShell.exe"
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// getLoggingCmd returns the powershell cmd and arguments for the given nodeLogQuery and boot
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func getLoggingCmd(n *nodeLogQuery, services []string) (string, []string, error) {
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args := []string{
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"-NonInteractive",
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"-ExecutionPolicy", "Bypass",
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"-Command",
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}
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psCmd := "Get-WinEvent -FilterHashtable @{LogName='Application'"
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if n.SinceTime != nil {
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psCmd += fmt.Sprintf("; StartTime='%s'", n.SinceTime.Format(dateLayout))
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}
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if n.UntilTime != nil {
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psCmd += fmt.Sprintf("; EndTime='%s'", n.UntilTime.Format(dateLayout))
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}
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var providers []string
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for _, service := range services {
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if len(service) > 0 {
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providers = append(providers, "'"+service+"'")
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}
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}
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if len(providers) > 0 {
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psCmd += fmt.Sprintf("; ProviderName=%s", strings.Join(providers, ","))
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}
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psCmd += "}"
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if n.TailLines != nil {
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psCmd += fmt.Sprintf(" -MaxEvents %d", *n.TailLines)
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}
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psCmd += " | Sort-Object TimeCreated"
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if len(n.Pattern) > 0 {
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psCmd += fmt.Sprintf(" | Where-Object -Property Message -Match '%s'", n.Pattern)
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}
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psCmd += " | Format-Table -AutoSize -Wrap"
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args = append(args, psCmd)
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return powershellExe, args, nil
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}
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// checkForNativeLogger always returns true for Windows
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func checkForNativeLogger(ctx context.Context, service string) bool {
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cmd := exec.CommandContext(ctx, powershellExe, []string{
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"-NonInteractive", "-ExecutionPolicy", "Bypass", "-Command",
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fmt.Sprintf("Get-WinEvent -ListProvider %s | Format-Table -AutoSize", service)}...)
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_, err := cmd.CombinedOutput()
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if err != nil {
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// Get-WinEvent will return ExitError if the service is not listed as a provider
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if _, ok := err.(*exec.ExitError); ok {
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return false
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}
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// Other errors imply that CombinedOutput failed before the command was executed,
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// so lets to get the logs using Get-WinEvent at the call site instead of assuming
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// the service is logging to a file
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}
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return true
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}
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