package docker import ( "context" "crypto/tls" "encoding/json" "fmt" "io" "net/http" "regexp" "strconv" "strings" "sync" "time" "github.com/docker/docker/api/types" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/filter" "github.com/influxdata/telegraf/internal" "github.com/influxdata/telegraf/plugins/inputs" ) // Docker object type Docker struct { Endpoint string ContainerNames []string Timeout internal.Duration PerDevice bool `toml:"perdevice"` Total bool `toml:"total"` TagEnvironment []string `toml:"tag_env"` LabelInclude []string `toml:"docker_label_include"` LabelExclude []string `toml:"docker_label_exclude"` ContainerInclude []string `toml:"container_name_include"` ContainerExclude []string `toml:"container_name_exclude"` SSLCA string `toml:"ssl_ca"` SSLCert string `toml:"ssl_cert"` SSLKey string `toml:"ssl_key"` InsecureSkipVerify bool newEnvClient func() (Client, error) newClient func(string, *tls.Config) (Client, error) client Client httpClient *http.Client engine_host string filtersCreated bool labelFilter filter.Filter containerFilter filter.Filter } // KB, MB, GB, TB, PB...human friendly const ( KB = 1000 MB = 1000 * KB GB = 1000 * MB TB = 1000 * GB PB = 1000 * TB defaultEndpoint = "unix:///var/run/docker.sock" ) var ( sizeRegex = regexp.MustCompile(`^(\d+(\.\d+)*) ?([kKmMgGtTpP])?[bB]?$`) ) var sampleConfig = ` ## Docker Endpoint ## To use TCP, set endpoint = "tcp://[ip]:[port]" ## To use environment variables (ie, docker-machine), set endpoint = "ENV" endpoint = "unix:///var/run/docker.sock" ## Only collect metrics for these containers, collect all if empty container_names = [] ## Containers to include and exclude. Globs accepted. ## Note that an empty array for both will include all containers container_name_include = [] container_name_exclude = [] ## Timeout for docker list, info, and stats commands timeout = "5s" ## Whether to report for each container per-device blkio (8:0, 8:1...) and ## network (eth0, eth1, ...) stats or not perdevice = true ## Whether to report for each container total blkio and network stats or not total = false ## Which environment variables should we use as a tag ##tag_env = ["JAVA_HOME", "HEAP_SIZE"] ## docker labels to include and exclude as tags. Globs accepted. ## Note that an empty array for both will include all labels as tags docker_label_include = [] docker_label_exclude = [] ## Optional SSL Config # ssl_ca = "/etc/telegraf/ca.pem" # ssl_cert = "/etc/telegraf/cert.pem" # ssl_key = "/etc/telegraf/key.pem" ## Use SSL but skip chain & host verification # insecure_skip_verify = false ` func (d *Docker) Description() string { return "Read metrics about docker containers" } func (d *Docker) SampleConfig() string { return sampleConfig } func (d *Docker) Gather(acc telegraf.Accumulator) error { if d.client == nil { var c Client var err error if d.Endpoint == "ENV" { c, err = d.newEnvClient() } else { tlsConfig, err := internal.GetTLSConfig( d.SSLCert, d.SSLKey, d.SSLCA, d.InsecureSkipVerify) if err != nil { return err } c, err = d.newClient(d.Endpoint, tlsConfig) } if err != nil { return err } d.client = c } // Create label filters if not already created if !d.filtersCreated { err := d.createLabelFilters() if err != nil { return err } err = d.createContainerFilters() if err != nil { return err } d.filtersCreated = true } // Get daemon info err := d.gatherInfo(acc) if err != nil { acc.AddError(err) } // List containers opts := types.ContainerListOptions{} ctx, cancel := context.WithTimeout(context.Background(), d.Timeout.Duration) defer cancel() containers, err := d.client.ContainerList(ctx, opts) if err != nil { return err } // Get container data var wg sync.WaitGroup wg.Add(len(containers)) for _, container := range containers { go func(c types.Container) { defer wg.Done() err := d.gatherContainer(c, acc) if err != nil { acc.AddError(fmt.Errorf("E! Error gathering container %s stats: %s\n", c.Names, err.Error())) } }(container) } wg.Wait() return nil } func (d *Docker) gatherInfo(acc telegraf.Accumulator) error { // Init vars dataFields := make(map[string]interface{}) metadataFields := make(map[string]interface{}) now := time.Now() // Get info from docker daemon ctx, cancel := context.WithTimeout(context.Background(), d.Timeout.Duration) defer cancel() info, err := d.client.Info(ctx) if err != nil { return err } d.engine_host = info.Name fields := map[string]interface{}{ "n_cpus": info.NCPU, "n_used_file_descriptors": info.NFd, "n_containers": info.Containers, "n_containers_running": info.ContainersRunning, "n_containers_stopped": info.ContainersStopped, "n_containers_paused": info.ContainersPaused, "n_images": info.Images, "n_goroutines": info.NGoroutines, "n_listener_events": info.NEventsListener, } // Add metrics acc.AddFields("docker", fields, map[string]string{"engine_host": d.engine_host}, now) acc.AddFields("docker", map[string]interface{}{"memory_total": info.MemTotal}, map[string]string{"unit": "bytes", "engine_host": d.engine_host}, now) // Get storage metrics for _, rawData := range info.DriverStatus { // Try to convert string to int (bytes) value, err := parseSize(rawData[1]) if err != nil { continue } name := strings.ToLower(strings.Replace(rawData[0], " ", "_", -1)) if name == "pool_blocksize" { // pool blocksize acc.AddFields("docker", map[string]interface{}{"pool_blocksize": value}, map[string]string{"unit": "bytes", "engine_host": d.engine_host}, now) } else if strings.HasPrefix(name, "data_space_") { // data space fieldName := strings.TrimPrefix(name, "data_space_") dataFields[fieldName] = value } else if strings.HasPrefix(name, "metadata_space_") { // metadata space fieldName := strings.TrimPrefix(name, "metadata_space_") metadataFields[fieldName] = value } } if len(dataFields) > 0 { acc.AddFields("docker_data", dataFields, map[string]string{"unit": "bytes", "engine_host": d.engine_host}, now) } if len(metadataFields) > 0 { acc.AddFields("docker_metadata", metadataFields, map[string]string{"unit": "bytes", "engine_host": d.engine_host}, now) } return nil } func (d *Docker) gatherContainer( container types.Container, acc telegraf.Accumulator, ) error { var v *types.StatsJSON // Parse container name cname := "unknown" if len(container.Names) > 0 { // Not sure what to do with other names, just take the first. cname = strings.TrimPrefix(container.Names[0], "/") } // the image name sometimes has a version part, or a private repo // ie, rabbitmq:3-management or docker.someco.net:4443/rabbitmq:3-management imageName := "" imageVersion := "unknown" i := strings.LastIndex(container.Image, ":") // index of last ':' character if i > -1 { imageVersion = container.Image[i+1:] imageName = container.Image[:i] } else { imageName = container.Image } tags := map[string]string{ "engine_host": d.engine_host, "container_name": cname, "container_image": imageName, "container_version": imageVersion, } if !d.containerFilter.Match(cname) { return nil } ctx, cancel := context.WithTimeout(context.Background(), d.Timeout.Duration) defer cancel() r, err := d.client.ContainerStats(ctx, container.ID, false) if err != nil { return fmt.Errorf("Error getting docker stats: %s", err.Error()) } defer r.Body.Close() dec := json.NewDecoder(r.Body) if err = dec.Decode(&v); err != nil { if err == io.EOF { return nil } return fmt.Errorf("Error decoding: %s", err.Error()) } daemonOSType := r.OSType // Add labels to tags for k, label := range container.Labels { if d.labelFilter.Match(k) { tags[k] = label } } // Add whitelisted environment variables to tags if len(d.TagEnvironment) > 0 { info, err := d.client.ContainerInspect(ctx, container.ID) if err != nil { return fmt.Errorf("Error inspecting docker container: %s", err.Error()) } for _, envvar := range info.Config.Env { for _, configvar := range d.TagEnvironment { dock_env := strings.SplitN(envvar, "=", 2) //check for presence of tag in whitelist if len(dock_env) == 2 && len(strings.TrimSpace(dock_env[1])) != 0 && configvar == dock_env[0] { tags[dock_env[0]] = dock_env[1] } } } } gatherContainerStats(v, acc, tags, container.ID, d.PerDevice, d.Total, daemonOSType) return nil } func gatherContainerStats( stat *types.StatsJSON, acc telegraf.Accumulator, tags map[string]string, id string, perDevice bool, total bool, daemonOSType string, ) { now := stat.Read memfields := map[string]interface{}{ "container_id": id, } memstats := []string{ "active_anon", "active_file", "cache", "hierarchical_memory_limit", "inactive_anon", "inactive_file", "mapped_file", "pgfault", "pgmajfault", "pgpgin", "pgpgout", "rss", "rss_huge", "total_active_anon", "total_active_file", "total_cache", "total_inactive_anon", "total_inactive_file", "total_mapped_file", "total_pgfault", "total_pgmajfault", "total_pgpgin", "total_pgpgout", "total_rss", "total_rss_huge", "total_unevictable", "total_writeback", "unevictable", "writeback", } for _, field := range memstats { if value, ok := stat.MemoryStats.Stats[field]; ok { memfields[field] = value } } if stat.MemoryStats.Failcnt != 0 { memfields["fail_count"] = stat.MemoryStats.Failcnt } if daemonOSType != "windows" { memfields["limit"] = stat.MemoryStats.Limit memfields["usage"] = stat.MemoryStats.Usage memfields["max_usage"] = stat.MemoryStats.MaxUsage mem := calculateMemUsageUnixNoCache(stat.MemoryStats) memLimit := float64(stat.MemoryStats.Limit) memfields["usage_percent"] = calculateMemPercentUnixNoCache(memLimit, mem) } else { memfields["commit_bytes"] = stat.MemoryStats.Commit memfields["commit_peak_bytes"] = stat.MemoryStats.CommitPeak memfields["private_working_set"] = stat.MemoryStats.PrivateWorkingSet } acc.AddFields("docker_container_mem", memfields, tags, now) cpufields := map[string]interface{}{ "usage_total": stat.CPUStats.CPUUsage.TotalUsage, "usage_in_usermode": stat.CPUStats.CPUUsage.UsageInUsermode, "usage_in_kernelmode": stat.CPUStats.CPUUsage.UsageInKernelmode, "usage_system": stat.CPUStats.SystemUsage, "throttling_periods": stat.CPUStats.ThrottlingData.Periods, "throttling_throttled_periods": stat.CPUStats.ThrottlingData.ThrottledPeriods, "throttling_throttled_time": stat.CPUStats.ThrottlingData.ThrottledTime, "container_id": id, } if daemonOSType != "windows" { previousCPU := stat.PreCPUStats.CPUUsage.TotalUsage previousSystem := stat.PreCPUStats.SystemUsage cpuPercent := calculateCPUPercentUnix(previousCPU, previousSystem, stat) cpufields["usage_percent"] = cpuPercent } else { cpuPercent := calculateCPUPercentWindows(stat) cpufields["usage_percent"] = cpuPercent } cputags := copyTags(tags) cputags["cpu"] = "cpu-total" acc.AddFields("docker_container_cpu", cpufields, cputags, now) // If we have OnlineCPUs field, then use it to restrict stats gathering to only Online CPUs // (https://github.com/moby/moby/commit/115f91d7575d6de6c7781a96a082f144fd17e400) var percpuusage []uint64 if stat.CPUStats.OnlineCPUs > 0 { percpuusage = stat.CPUStats.CPUUsage.PercpuUsage[:stat.CPUStats.OnlineCPUs] } else { percpuusage = stat.CPUStats.CPUUsage.PercpuUsage } for i, percpu := range percpuusage { percputags := copyTags(tags) percputags["cpu"] = fmt.Sprintf("cpu%d", i) fields := map[string]interface{}{ "usage_total": percpu, "container_id": id, } acc.AddFields("docker_container_cpu", fields, percputags, now) } totalNetworkStatMap := make(map[string]interface{}) for network, netstats := range stat.Networks { netfields := map[string]interface{}{ "rx_dropped": netstats.RxDropped, "rx_bytes": netstats.RxBytes, "rx_errors": netstats.RxErrors, "tx_packets": netstats.TxPackets, "tx_dropped": netstats.TxDropped, "rx_packets": netstats.RxPackets, "tx_errors": netstats.TxErrors, "tx_bytes": netstats.TxBytes, "container_id": id, } // Create a new network tag dictionary for the "network" tag if perDevice { nettags := copyTags(tags) nettags["network"] = network acc.AddFields("docker_container_net", netfields, nettags, now) } if total { for field, value := range netfields { if field == "container_id" { continue } var uintV uint64 switch v := value.(type) { case uint64: uintV = v case int64: uintV = uint64(v) default: continue } _, ok := totalNetworkStatMap[field] if ok { totalNetworkStatMap[field] = totalNetworkStatMap[field].(uint64) + uintV } else { totalNetworkStatMap[field] = uintV } } } } // totalNetworkStatMap could be empty if container is running with --net=host. if total && len(totalNetworkStatMap) != 0 { nettags := copyTags(tags) nettags["network"] = "total" totalNetworkStatMap["container_id"] = id acc.AddFields("docker_container_net", totalNetworkStatMap, nettags, now) } gatherBlockIOMetrics(stat, acc, tags, now, id, perDevice, total) } func gatherBlockIOMetrics( stat *types.StatsJSON, acc telegraf.Accumulator, tags map[string]string, now time.Time, id string, perDevice bool, total bool, ) { blkioStats := stat.BlkioStats // Make a map of devices to their block io stats deviceStatMap := make(map[string]map[string]interface{}) for _, metric := range blkioStats.IoServiceBytesRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) _, ok := deviceStatMap[device] if !ok { deviceStatMap[device] = make(map[string]interface{}) } field := fmt.Sprintf("io_service_bytes_recursive_%s", strings.ToLower(metric.Op)) deviceStatMap[device][field] = metric.Value } for _, metric := range blkioStats.IoServicedRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) _, ok := deviceStatMap[device] if !ok { deviceStatMap[device] = make(map[string]interface{}) } field := fmt.Sprintf("io_serviced_recursive_%s", strings.ToLower(metric.Op)) deviceStatMap[device][field] = metric.Value } for _, metric := range blkioStats.IoQueuedRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) field := fmt.Sprintf("io_queue_recursive_%s", strings.ToLower(metric.Op)) deviceStatMap[device][field] = metric.Value } for _, metric := range blkioStats.IoServiceTimeRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) field := fmt.Sprintf("io_service_time_recursive_%s", strings.ToLower(metric.Op)) deviceStatMap[device][field] = metric.Value } for _, metric := range blkioStats.IoWaitTimeRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) field := fmt.Sprintf("io_wait_time_%s", strings.ToLower(metric.Op)) deviceStatMap[device][field] = metric.Value } for _, metric := range blkioStats.IoMergedRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) field := fmt.Sprintf("io_merged_recursive_%s", strings.ToLower(metric.Op)) deviceStatMap[device][field] = metric.Value } for _, metric := range blkioStats.IoTimeRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) deviceStatMap[device]["io_time_recursive"] = metric.Value } for _, metric := range blkioStats.SectorsRecursive { device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor) deviceStatMap[device]["sectors_recursive"] = metric.Value } totalStatMap := make(map[string]interface{}) for device, fields := range deviceStatMap { fields["container_id"] = id if perDevice { iotags := copyTags(tags) iotags["device"] = device acc.AddFields("docker_container_blkio", fields, iotags, now) } if total { for field, value := range fields { if field == "container_id" { continue } var uintV uint64 switch v := value.(type) { case uint64: uintV = v case int64: uintV = uint64(v) default: continue } _, ok := totalStatMap[field] if ok { totalStatMap[field] = totalStatMap[field].(uint64) + uintV } else { totalStatMap[field] = uintV } } } } if total { totalStatMap["container_id"] = id iotags := copyTags(tags) iotags["device"] = "total" acc.AddFields("docker_container_blkio", totalStatMap, iotags, now) } } func copyTags(in map[string]string) map[string]string { out := make(map[string]string) for k, v := range in { out[k] = v } return out } func sliceContains(in string, sl []string) bool { for _, str := range sl { if str == in { return true } } return false } // Parses the human-readable size string into the amount it represents. func parseSize(sizeStr string) (int64, error) { matches := sizeRegex.FindStringSubmatch(sizeStr) if len(matches) != 4 { return -1, fmt.Errorf("invalid size: '%s'", sizeStr) } size, err := strconv.ParseFloat(matches[1], 64) if err != nil { return -1, err } uMap := map[string]int64{"k": KB, "m": MB, "g": GB, "t": TB, "p": PB} unitPrefix := strings.ToLower(matches[3]) if mul, ok := uMap[unitPrefix]; ok { size *= float64(mul) } return int64(size), nil } func (d *Docker) createContainerFilters() error { // Backwards compatibility for deprecated `container_names` parameter. if len(d.ContainerNames) > 0 { d.ContainerInclude = append(d.ContainerInclude, d.ContainerNames...) } filter, err := filter.NewIncludeExcludeFilter(d.ContainerInclude, d.ContainerExclude) if err != nil { return err } d.containerFilter = filter return nil } func (d *Docker) createLabelFilters() error { filter, err := filter.NewIncludeExcludeFilter(d.LabelInclude, d.LabelExclude) if err != nil { return err } d.labelFilter = filter return nil } func init() { inputs.Add("docker", func() telegraf.Input { return &Docker{ PerDevice: true, Timeout: internal.Duration{Duration: time.Second * 5}, Endpoint: defaultEndpoint, newEnvClient: NewEnvClient, newClient: NewClient, filtersCreated: false, } }) }