package daemon // import "github.com/docker/docker/daemon" import ( "sync" "github.com/docker/docker/errdefs" "github.com/docker/docker/pkg/plugingetter" "github.com/docker/docker/pkg/plugins" metrics "github.com/docker/go-metrics" "github.com/pkg/errors" "github.com/prometheus/client_golang/prometheus" "github.com/sirupsen/logrus" ) const metricsPluginType = "MetricsCollector" var ( containerActions metrics.LabeledTimer networkActions metrics.LabeledTimer hostInfoFunctions metrics.LabeledTimer engineInfo metrics.LabeledGauge engineCpus metrics.Gauge engineMemory metrics.Gauge healthChecksCounter metrics.Counter healthChecksFailedCounter metrics.Counter stateCtr *stateCounter ) func init() { ns := metrics.NewNamespace("engine", "daemon", nil) containerActions = ns.NewLabeledTimer("container_actions", "The number of seconds it takes to process each container action", "action") for _, a := range []string{ "start", "changes", "commit", "create", "delete", } { containerActions.WithValues(a).Update(0) } hostInfoFunctions = ns.NewLabeledTimer("host_info_functions", "The number of seconds it takes to call functions gathering info about the host", "function") networkActions = ns.NewLabeledTimer("network_actions", "The number of seconds it takes to process each network action", "action") engineInfo = ns.NewLabeledGauge("engine", "The information related to the engine and the OS it is running on", metrics.Unit("info"), "version", "commit", "architecture", "graphdriver", "kernel", "os", "os_type", "os_version", "daemon_id", // ID is a randomly generated unique identifier (e.g. UUID4) ) engineCpus = ns.NewGauge("engine_cpus", "The number of cpus that the host system of the engine has", metrics.Unit("cpus")) engineMemory = ns.NewGauge("engine_memory", "The number of bytes of memory that the host system of the engine has", metrics.Bytes) healthChecksCounter = ns.NewCounter("health_checks", "The total number of health checks") healthChecksFailedCounter = ns.NewCounter("health_checks_failed", "The total number of failed health checks") stateCtr = newStateCounter(ns.NewDesc("container_states", "The count of containers in various states", metrics.Unit("containers"), "state")) ns.Add(stateCtr) metrics.Register(ns) } type stateCounter struct { mu sync.RWMutex states map[string]string desc *prometheus.Desc } func newStateCounter(desc *prometheus.Desc) *stateCounter { return &stateCounter{ states: make(map[string]string), desc: desc, } } func (ctr *stateCounter) get() (running int, paused int, stopped int) { ctr.mu.RLock() defer ctr.mu.RUnlock() states := map[string]int{ "running": 0, "paused": 0, "stopped": 0, } for _, state := range ctr.states { states[state]++ } return states["running"], states["paused"], states["stopped"] } func (ctr *stateCounter) set(id, label string) { ctr.mu.Lock() ctr.states[id] = label ctr.mu.Unlock() } func (ctr *stateCounter) del(id string) { ctr.mu.Lock() delete(ctr.states, id) ctr.mu.Unlock() } func (ctr *stateCounter) Describe(ch chan<- *prometheus.Desc) { ch <- ctr.desc } func (ctr *stateCounter) Collect(ch chan<- prometheus.Metric) { running, paused, stopped := ctr.get() ch <- prometheus.MustNewConstMetric(ctr.desc, prometheus.GaugeValue, float64(running), "running") ch <- prometheus.MustNewConstMetric(ctr.desc, prometheus.GaugeValue, float64(paused), "paused") ch <- prometheus.MustNewConstMetric(ctr.desc, prometheus.GaugeValue, float64(stopped), "stopped") } func (daemon *Daemon) cleanupMetricsPlugins() { ls := daemon.PluginStore.GetAllManagedPluginsByCap(metricsPluginType) var wg sync.WaitGroup wg.Add(len(ls)) for _, plugin := range ls { p := plugin go func() { defer wg.Done() adapter, err := makePluginAdapter(p) if err != nil { logrus.WithError(err).WithField("plugin", p.Name()).Error("Error creating metrics plugin adapter") return } if err := adapter.StopMetrics(); err != nil { logrus.WithError(err).WithField("plugin", p.Name()).Error("Error stopping plugin metrics collection") } }() } wg.Wait() if daemon.metricsPluginListener != nil { daemon.metricsPluginListener.Close() } } type metricsPlugin interface { StartMetrics() error StopMetrics() error } func makePluginAdapter(p plugingetter.CompatPlugin) (metricsPlugin, error) { if pc, ok := p.(plugingetter.PluginWithV1Client); ok { return &metricsPluginAdapter{pc.Client(), p.Name()}, nil } pa, ok := p.(plugingetter.PluginAddr) if !ok { return nil, errdefs.System(errors.Errorf("got unknown plugin type %T", p)) } if pa.Protocol() != plugins.ProtocolSchemeHTTPV1 { return nil, errors.Errorf("plugin protocol not supported: %s", pa.Protocol()) } addr := pa.Addr() client, err := plugins.NewClientWithTimeout(addr.Network()+"://"+addr.String(), nil, pa.Timeout()) if err != nil { return nil, errors.Wrap(err, "error creating metrics plugin client") } return &metricsPluginAdapter{client, p.Name()}, nil } type metricsPluginAdapter struct { c *plugins.Client name string } func (a *metricsPluginAdapter) StartMetrics() error { type metricsPluginResponse struct { Err string } var res metricsPluginResponse if err := a.c.Call(metricsPluginType+".StartMetrics", nil, &res); err != nil { return errors.Wrap(err, "could not start metrics plugin") } if res.Err != "" { return errors.New(res.Err) } return nil } func (a *metricsPluginAdapter) StopMetrics() error { if err := a.c.Call(metricsPluginType+".StopMetrics", nil, nil); err != nil { return errors.Wrap(err, "error stopping metrics collector") } return nil }