4bb30c3b0e
This change also involves adding a custom error type for probe timeouts so that the kubelet exec prober can distinguish between failed probes that have exited or probes that have timed out. Signed-off-by: Andrew Sy Kim <kim.andrewsy@gmail.com>
85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
/*
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Copyright 2015 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 exec
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import (
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"bytes"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/kubernetes/pkg/features"
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"k8s.io/kubernetes/pkg/kubelet/util/ioutils"
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"k8s.io/kubernetes/pkg/probe"
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"k8s.io/klog/v2"
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"k8s.io/utils/exec"
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)
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const (
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maxReadLength = 10 * 1 << 10 // 10KB
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)
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// New creates a Prober.
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func New() Prober {
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return execProber{}
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}
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// Prober is an interface defining the Probe object for container readiness/liveness checks.
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type Prober interface {
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Probe(e exec.Cmd) (probe.Result, string, error)
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}
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type execProber struct{}
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// Probe executes a command to check the liveness/readiness of container
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// from executing a command. Returns the Result status, command output, and
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// errors if any.
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func (pr execProber) Probe(e exec.Cmd) (probe.Result, string, error) {
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var dataBuffer bytes.Buffer
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writer := ioutils.LimitWriter(&dataBuffer, maxReadLength)
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e.SetStderr(writer)
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e.SetStdout(writer)
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err := e.Start()
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if err == nil {
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err = e.Wait()
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}
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data := dataBuffer.Bytes()
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klog.V(4).Infof("Exec probe response: %q", string(data))
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if err != nil {
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exit, ok := err.(exec.ExitError)
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if ok {
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if exit.ExitStatus() == 0 {
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return probe.Success, string(data), nil
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}
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return probe.Failure, string(data), nil
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}
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timeoutErr, ok := err.(*TimeoutError)
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if ok {
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if utilfeature.DefaultFeatureGate.Enabled(features.ExecProbeTimeout) {
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return probe.Failure, string(data), nil
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}
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klog.Warningf("Exec probe timed out after %s but ExecProbeTimeout feature gate was disabled", timeoutErr.Timeout())
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}
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return probe.Unknown, "", err
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}
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return probe.Success, string(data), nil
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}
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