mirror of
https://github.com/k3s-io/kubernetes.git
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78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// Copyright 2019 Google Inc. All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package docker
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import (
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"time"
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"github.com/google/cadvisor/container"
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"github.com/google/cadvisor/fs"
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info "github.com/google/cadvisor/info/v1"
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"github.com/google/cadvisor/watcher"
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"golang.org/x/net/context"
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"k8s.io/klog"
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)
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const dockerClientTimeout = 10 * time.Second
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// NewPlugin returns an implementation of container.Plugin suitable for passing to container.RegisterPlugin()
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func NewPlugin() container.Plugin {
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return &plugin{}
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}
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type plugin struct{}
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func (p *plugin) InitializeFSContext(context *fs.Context) error {
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SetTimeout(dockerClientTimeout)
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// Try to connect to docker indefinitely on startup.
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dockerStatus := retryDockerStatus()
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context.Docker = fs.DockerContext{
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Root: RootDir(),
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Driver: dockerStatus.Driver,
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DriverStatus: dockerStatus.DriverStatus,
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}
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return nil
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}
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func (p *plugin) Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics container.MetricSet) (watcher.ContainerWatcher, error) {
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err := Register(factory, fsInfo, includedMetrics)
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return nil, err
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}
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func retryDockerStatus() info.DockerStatus {
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startupTimeout := dockerClientTimeout
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maxTimeout := 4 * startupTimeout
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for {
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ctx, _ := context.WithTimeout(context.Background(), startupTimeout)
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dockerStatus, err := StatusWithContext(ctx)
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if err == nil {
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return dockerStatus
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}
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switch err {
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case context.DeadlineExceeded:
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klog.Warningf("Timeout trying to communicate with docker during initialization, will retry")
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default:
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klog.V(5).Infof("Docker not connected: %v", err)
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return info.DockerStatus{}
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}
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startupTimeout = 2 * startupTimeout
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if startupTimeout > maxTimeout {
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startupTimeout = maxTimeout
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}
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}
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}
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