Support Docker ServiceDiscovery (#1402)

* add docker discovery

* add test

* add labels test and add scrape work

* remove TODO

* refactor to merge apiConfig and sdConfig

* apply suggestion

lib/promscrape/config.go

@@ -21,7 +21,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/consul"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/digitalocean"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dns"
-	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dockerswarm"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/docker"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/ec2"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/eureka"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/gce"
@@ -125,7 +125,8 @@ type ScrapeConfig struct {
 	OpenStackSDConfigs    []openstack.SDConfig         `yaml:"openstack_sd_configs,omitempty"`
 	ConsulSDConfigs       []consul.SDConfig            `yaml:"consul_sd_configs,omitempty"`
 	EurekaSDConfigs       []eureka.SDConfig            `yaml:"eureka_sd_configs,omitempty"`
-	DockerSwarmSDConfigs  []dockerswarm.SDConfig  `yaml:"dockerswarm_sd_configs,omitempty"`
+	DockerSDConfigs       []docker.DockerSDConfig      `yaml:"docker_sd_configs,omitempty"`
+	DockerSwarmSDConfigs  []docker.DockerSwarmSDConfig `yaml:"dockerswarm_sd_configs,omitempty"`
 	DNSSDConfigs          []dns.SDConfig               `yaml:"dns_sd_configs,omitempty"`
 	EC2SDConfigs          []ec2.SDConfig               `yaml:"ec2_sd_configs,omitempty"`
 	GCESDConfigs          []gce.SDConfig               `yaml:"gce_sd_configs,omitempty"`
@@ -174,6 +175,9 @@ func (sc *ScrapeConfig) mustStop() {
 	for i := range sc.EurekaSDConfigs {
 		sc.EurekaSDConfigs[i].MustStop()
 	}
+	for i := range sc.DockerSDConfigs {
+		sc.DockerSDConfigs[i].MustStop()
+	}
 	for i := range sc.DockerSwarmSDConfigs {
 		sc.DockerSwarmSDConfigs[i].MustStop()
 	}
@@ -341,6 +345,34 @@ func (cfg *Config) getOpenStackSDScrapeWork(prev []*ScrapeWork) []*ScrapeWork {
 	return dst
 }
 
+// getDockerSDScrapeWork returns `docker_sd_configs` ScrapeWork from cfg.
+func (cfg *Config) getDockerSDScrapeWork(prev []*ScrapeWork) []*ScrapeWork {
+	swsPrevByJob := getSWSByJob(prev)
+	dst := make([]*ScrapeWork, 0, len(prev))
+	for i := range cfg.ScrapeConfigs {
+		sc := &cfg.ScrapeConfigs[i]
+		dstLen := len(dst)
+		ok := true
+		for j := range sc.DockerSDConfigs {
+			sdc := &sc.DockerSDConfigs[j]
+			var okLocal bool
+			dst, okLocal = appendSDScrapeWork(dst, sdc, cfg.baseDir, sc.swc, "docker_sd_config")
+			if ok {
+				ok = okLocal
+			}
+		}
+		if ok {
+			continue
+		}
+		swsPrev := swsPrevByJob[sc.swc.jobName]
+		if len(swsPrev) > 0 {
+			logger.Errorf("there were errors when discovering docker targets for job %q, so preserving the previous targets", sc.swc.jobName)
+			dst = append(dst[:dstLen], swsPrev...)
+		}
+	}
+	return dst
+}
+
 // getDockerSwarmSDScrapeWork returns `dockerswarm_sd_configs` ScrapeWork from cfg.
 func (cfg *Config) getDockerSwarmSDScrapeWork(prev []*ScrapeWork) []*ScrapeWork {
 	swsPrevByJob := getSWSByJob(prev)

lib/promscrape/discovery/docker/api.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"encoding/json"
@@ -20,7 +20,7 @@ type apiConfig struct {
 	filtersQueryArg string
 }
 
-func getAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
+func getAPIConfigFromDockerSDConfig(sdc *DockerSDConfig, baseDir string) (*apiConfig, error) {
 	v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(sdc, baseDir) })
 	if err != nil {
 		return nil, err
@@ -28,7 +28,15 @@ func getAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
 	return v.(*apiConfig), nil
 }
 
-func newAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
+func getAPIConfigFromDockerSwarmSDConfig(sdc *DockerSwarmSDConfig, baseDir string) (*apiConfig, error) {
+	v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(&sdc.DockerSDConfig, baseDir) })
+	if err != nil {
+		return nil, err
+	}
+	return v.(*apiConfig), nil
+}
+
+func newAPIConfig(sdc *DockerSDConfig, baseDir string) (*apiConfig, error) {
 	cfg := &apiConfig{
 		port:            sdc.Port,
 		filtersQueryArg: getFiltersQueryArg(sdc.Filters),

lib/promscrape/discovery/docker/api_test.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"testing"

lib/promscrape/discovery/docker/containers.go

@@ -0,0 +1,132 @@
+package docker
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
+)
+
+// See https://github.com/moby/moby/blob/314759dc2f4745925d8dec6d15acc7761c6e5c92/docs/api/v1.41.yaml#L4024
+type container struct {
+	Id     string
+	Names  []string
+	Labels map[string]string
+	Ports  []struct {
+		IP          string
+		PrivatePort int
+		PublicPort  int
+		Type        string
+	}
+	HostConfig struct {
+		NetworkMode string
+	}
+	NetworkSettings struct {
+		Networks map[string]struct {
+			IPAddress string
+			NetworkID string
+		}
+	}
+}
+
+func getContainersLabels(cfg *apiConfig) ([]map[string]string, error) {
+	networkLabels, err := getNetworksLabels(cfg, "__meta_docker_")
+
+	if err != nil {
+		return nil, err
+	}
+
+	containers, err := getContainers(cfg)
+	if err != nil {
+		return nil, err
+	}
+	return addContainersLabels(containers, networkLabels, cfg.port), nil
+}
+
+func getContainers(cfg *apiConfig) ([]container, error) {
+	resp, err := cfg.getAPIResponse("/containers/json")
+	if err != nil {
+		return nil, fmt.Errorf("cannot query dockerd api for containers: %w", err)
+	}
+	return parseContainers(resp)
+}
+
+func parseContainers(data []byte) ([]container, error) {
+	var containers []container
+	if err := json.Unmarshal(data, &containers); err != nil {
+		return nil, fmt.Errorf("cannot parse containers: %w", err)
+	}
+	return containers, nil
+}
+
+func addContainersLabels(containers []container, networkLabels map[string]map[string]string, defaultPort int) []map[string]string {
+	var ms []map[string]string
+	for _, c := range containers {
+		if c.Names == nil || len(c.Names) == 0 {
+			continue
+		}
+
+		commonLabels := map[string]string{
+			"__meta_docker_container_id":           c.Id,
+			"__meta_docker_container_name":         c.Names[0],
+			"__meta_docker_container_network_mode": c.HostConfig.NetworkMode,
+		}
+
+		for k, v := range c.Labels {
+			commonLabels["__meta_docker_container_label_"+discoveryutils.SanitizeLabelName(k)] = v
+		}
+
+		for _, network := range c.NetworkSettings.Networks {
+			var added bool
+
+			for _, port := range c.Ports {
+				if port.Type != "tcp" {
+					continue
+				}
+
+				labels := map[string]string{
+					"__meta_docker_network_ip":   network.IPAddress,
+					"__meta_docker_port_private": strconv.FormatInt(int64(port.PrivatePort), 10),
+				}
+
+				if port.PublicPort > 0 {
+					labels["__meta_docker_port_public"] = strconv.FormatInt(int64(port.PublicPort), 10)
+					labels["__meta_docker_port_public_ip"] = port.IP
+				}
+
+				for k, v := range commonLabels {
+					labels[k] = v
+				}
+
+				for k, v := range networkLabels[network.NetworkID] {
+					labels[k] = v
+				}
+
+				labels["__address__"] = discoveryutils.JoinHostPort(network.IPAddress, port.PrivatePort)
+				ms = append(ms, labels)
+
+				added = true
+			}
+
+			if !added {
+				// Use fallback port when no exposed ports are available or if all are non-TCP
+				labels := map[string]string{
+					"__meta_docker_network_ip": network.IPAddress,
+				}
+
+				for k, v := range commonLabels {
+					labels[k] = v
+				}
+
+				for k, v := range networkLabels[network.NetworkID] {
+					labels[k] = v
+				}
+
+				labels["__address__"] = discoveryutils.JoinHostPort(network.IPAddress, defaultPort)
+				ms = append(ms, labels)
+			}
+		}
+	}
+	return ms
+}

lib/promscrape/discovery/docker/containers_test.go

@@ -0,0 +1,404 @@
+package docker
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_parseContainers(t *testing.T) {
+	type args struct {
+		data []byte
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    []container
+		wantErr bool
+	}{
+		{
+			name: "parse two containers",
+			args: args{
+				data: []byte(`[
+  {
+    "Id": "90bc3b31aa13da5c0b11af2e228d54b38428a84e25d4e249ae9e9c95e51a0700",
+    "Names": [
+      "/crow-server"
+    ],
+    "ImageID": "sha256:11045371758ccf9468d807d53d1e1faa100c8ebabe87296bc107d52bdf983378",
+    "Created": 1624440429,
+    "Ports": [
+      {
+        "IP": "0.0.0.0",
+        "PrivatePort": 8080,
+        "PublicPort": 18081,
+        "Type": "tcp"
+      }
+    ],
+    "Labels": {
+      "com.docker.compose.config-hash": "c9f0bd5bb31921f94cff367d819a30a0cc08d4399080897a6c5cd74b983156ec",
+      "com.docker.compose.container-number": "1",
+      "com.docker.compose.oneoff": "False",
+      "com.docker.compose.project": "crowserver",
+      "com.docker.compose.service": "crow-server",
+      "com.docker.compose.version": "1.11.2"
+    },
+    "State": "running",
+    "Status": "Up 2 hours",
+    "HostConfig": {
+      "NetworkMode": "bridge"
+    },
+    "NetworkSettings": {
+      "Networks": {
+        "bridge": {
+          "IPAMConfig": null,
+          "Links": null,
+          "Aliases": null,
+          "NetworkID": "1dd8d1a8bef59943345c7231d7ce8268333ff5a8c5b3c94881e6b4742b447634",
+          "EndpointID": "2bcd751c98578ad1ce3d6798077a3e110535f3dcb0b0735cc84bd1e03905d907",
+          "Gateway": "172.17.0.1",
+          "IPAddress": "172.17.0.2",
+          "IPPrefixLen": 16,
+          "IPv6Gateway": "",
+          "GlobalIPv6Address": "",
+          "GlobalIPv6PrefixLen": 0,
+          "DriverOpts": null
+        }
+      }
+    }
+  },
+  {
+    "Id": "0e0f72a6eb7d9fb443f0426a66f7b8dd7d3283ab7e3a308b2bed584ac03a33dc",
+    "Names": [
+      "/crow-web"
+    ],
+    "ImageID": "sha256:36e04dd2f67950179ab62a4ebd1b8b741232263fa1f210496a53335d5820b3af",
+    "Created": 1618302442,
+    "Ports": [
+      {
+        "IP": "0.0.0.0",
+        "PrivatePort": 8080,
+        "PublicPort": 18082,
+        "Type": "tcp"
+      }
+    ],
+    "Labels": {
+      "com.docker.compose.config-hash": "d99ebd0fde8512366c2d78c367e95ddc74528bb60b7cf0c991c9f4835981e00e",
+      "com.docker.compose.container-number": "1",
+      "com.docker.compose.oneoff": "False",
+      "com.docker.compose.project": "crowweb",
+      "com.docker.compose.service": "crow-web",
+      "com.docker.compose.version": "1.11.2"
+    },
+    "State": "running",
+    "Status": "Up 2 months",
+    "HostConfig": {
+      "NetworkMode": "bridge"
+    },
+    "NetworkSettings": {
+      "Networks": {
+        "bridge": {
+          "IPAMConfig": null,
+          "Links": null,
+          "Aliases": null,
+          "NetworkID": "1dd8d1a8bef59943345c7231d7ce8268333ff5a8c5b3c94881e6b4742b447634",
+          "EndpointID": "78d751dfa31923d73e001e5dc5751ad6f9f5ffeb88056fc950f0a952d7f24302",
+          "Gateway": "172.17.0.1",
+          "IPAddress": "172.17.0.3",
+          "IPPrefixLen": 16,
+          "IPv6Gateway": "",
+          "GlobalIPv6Address": "",
+          "GlobalIPv6PrefixLen": 0,
+          "DriverOpts": null
+        }
+      }
+    }
+  }
+]`),
+			},
+			want: []container{
+				{
+					Id:    "90bc3b31aa13da5c0b11af2e228d54b38428a84e25d4e249ae9e9c95e51a0700",
+					Names: []string{"/crow-server"},
+					Labels: map[string]string{
+						"com.docker.compose.config-hash":      "c9f0bd5bb31921f94cff367d819a30a0cc08d4399080897a6c5cd74b983156ec",
+						"com.docker.compose.container-number": "1",
+						"com.docker.compose.oneoff":           "False",
+						"com.docker.compose.project":          "crowserver",
+						"com.docker.compose.service":          "crow-server",
+						"com.docker.compose.version":          "1.11.2",
+					},
+					Ports: []struct {
+						IP          string
+						PrivatePort int
+						PublicPort  int
+						Type        string
+					}{{
+						IP:          "0.0.0.0",
+						PrivatePort: 8080,
+						PublicPort:  18081,
+						Type:        "tcp",
+					}},
+					HostConfig: struct {
+						NetworkMode string
+					}{
+						NetworkMode: "bridge",
+					},
+					NetworkSettings: struct {
+						Networks map[string]struct {
+							IPAddress string
+							NetworkID string
+						}
+					}{
+						Networks: map[string]struct {
+							IPAddress string
+							NetworkID string
+						}{
+							"bridge": {
+								IPAddress: "172.17.0.2",
+								NetworkID: "1dd8d1a8bef59943345c7231d7ce8268333ff5a8c5b3c94881e6b4742b447634",
+							},
+						},
+					},
+				},
+				{
+					Id:    "0e0f72a6eb7d9fb443f0426a66f7b8dd7d3283ab7e3a308b2bed584ac03a33dc",
+					Names: []string{"/crow-web"},
+					Labels: map[string]string{
+						"com.docker.compose.config-hash":      "d99ebd0fde8512366c2d78c367e95ddc74528bb60b7cf0c991c9f4835981e00e",
+						"com.docker.compose.container-number": "1",
+						"com.docker.compose.oneoff":           "False",
+						"com.docker.compose.project":          "crowweb",
+						"com.docker.compose.service":          "crow-web",
+						"com.docker.compose.version":          "1.11.2",
+					},
+					Ports: []struct {
+						IP          string
+						PrivatePort int
+						PublicPort  int
+						Type        string
+					}{{
+						IP:          "0.0.0.0",
+						PrivatePort: 8080,
+						PublicPort:  18082,
+						Type:        "tcp",
+					}},
+					HostConfig: struct {
+						NetworkMode string
+					}{
+						NetworkMode: "bridge",
+					},
+					NetworkSettings: struct {
+						Networks map[string]struct {
+							IPAddress string
+							NetworkID string
+						}
+					}{
+						Networks: map[string]struct {
+							IPAddress string
+							NetworkID string
+						}{
+							"bridge": {
+								IPAddress: "172.17.0.3",
+								NetworkID: "1dd8d1a8bef59943345c7231d7ce8268333ff5a8c5b3c94881e6b4742b447634",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := parseContainers(tt.args.data)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("parseContainers() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("parseNetworks() \ngot  %v, \nwant %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_addContainerLabels(t *testing.T) {
+	data := []byte(`[
+  {
+    "Name": "host",
+    "Id": "6a1989488dcb847c052eda939924d997457d5ecd994f76f35472996c4c75279a",
+    "Created": "2020-08-18T17:18:18.439033107+08:00",
+    "Scope": "local",
+    "Driver": "host",
+    "EnableIPv6": false,
+    "IPAM": {
+      "Driver": "default",
+      "Options": null,
+      "Config": []
+    },
+    "Internal": false,
+    "Attachable": false,
+    "Ingress": false,
+    "ConfigFrom": {
+      "Network": ""
+    },
+    "ConfigOnly": false,
+    "Containers": {},
+    "Options": {},
+    "Labels": {}
+  },
+  {
+    "Name": "none",
+    "Id": "c9668d06973d976527e913ba207a3819275649f347390379ec8356db375cfde3",
+    "Created": "2020-08-18T17:18:18.428827132+08:00",
+    "Scope": "local",
+    "Driver": "null",
+    "EnableIPv6": false,
+    "IPAM": {
+      "Driver": "default",
+      "Options": null,
+      "Config": []
+    },
+    "Internal": false,
+    "Attachable": false,
+    "Ingress": false,
+    "ConfigFrom": {
+      "Network": ""
+    },
+    "ConfigOnly": false,
+    "Containers": {},
+    "Options": {},
+    "Labels": {}
+  },
+  {
+    "Name": "bridge",
+    "Id": "1dd8d1a8bef59943345c7231d7ce8268333ff5a8c5b3c94881e6b4742b447634",
+    "Created": "2021-03-18T14:36:04.290821903+08:00",
+    "Scope": "local",
+    "Driver": "bridge",
+    "EnableIPv6": false,
+    "IPAM": {
+      "Driver": "default",
+      "Options": null,
+      "Config": [
+        {
+          "Subnet": "172.17.0.0/16",
+          "Gateway": "172.17.0.1"
+        }
+      ]
+    },
+    "Internal": false,
+    "Attachable": false,
+    "Ingress": false,
+    "ConfigFrom": {
+      "Network": ""
+    },
+    "ConfigOnly": false,
+    "Containers": {},
+    "Options": {
+      "com.docker.network.bridge.default_bridge": "true",
+      "com.docker.network.bridge.enable_icc": "true",
+      "com.docker.network.bridge.enable_ip_masquerade": "true",
+      "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
+      "com.docker.network.bridge.name": "docker0",
+      "com.docker.network.driver.mtu": "1500"
+    },
+    "Labels": {}
+  }
+]`)
+	networks, err := parseNetworks(data)
+	if err != nil {
+		t.Fatalf("fail to parse networks: %v", err)
+	}
+	networkLabels := getNetworkLabelsGroupByNetworkID(networks, "__meta_docker_")
+
+	tests := []struct {
+		name    string
+		c       container
+		want    []map[string]string
+		wantErr bool
+	}{
+		{
+			name: "get labels from a container",
+			c: container{
+				Id:    "90bc3b31aa13da5c0b11af2e228d54b38428a84e25d4e249ae9e9c95e51a0700",
+				Names: []string{"/crow-server"},
+				Labels: map[string]string{
+					"com.docker.compose.config-hash":      "c9f0bd5bb31921f94cff367d819a30a0cc08d4399080897a6c5cd74b983156ec",
+					"com.docker.compose.container-number": "1",
+					"com.docker.compose.oneoff":           "False",
+					"com.docker.compose.project":          "crowserver",
+					"com.docker.compose.service":          "crow-server",
+					"com.docker.compose.version":          "1.11.2",
+				},
+				Ports: []struct {
+					IP          string
+					PrivatePort int
+					PublicPort  int
+					Type        string
+				}{{
+					IP:          "0.0.0.0",
+					PrivatePort: 8080,
+					PublicPort:  18081,
+					Type:        "tcp",
+				}},
+				HostConfig: struct {
+					NetworkMode string
+				}{
+					NetworkMode: "bridge",
+				},
+				NetworkSettings: struct {
+					Networks map[string]struct {
+						IPAddress string
+						NetworkID string
+					}
+				}{
+					Networks: map[string]struct {
+						IPAddress string
+						NetworkID string
+					}{
+						"bridge": {
+							IPAddress: "172.17.0.2",
+							NetworkID: "1dd8d1a8bef59943345c7231d7ce8268333ff5a8c5b3c94881e6b4742b447634",
+						},
+					},
+				},
+			},
+			want: []map[string]string{
+				{
+					"__address__":                "172.17.0.2:8080",
+					"__meta_docker_container_id": "90bc3b31aa13da5c0b11af2e228d54b38428a84e25d4e249ae9e9c95e51a0700",
+					"__meta_docker_container_label_com_docker_compose_config_hash":      "c9f0bd5bb31921f94cff367d819a30a0cc08d4399080897a6c5cd74b983156ec",
+					"__meta_docker_container_label_com_docker_compose_container_number": "1",
+					"__meta_docker_container_label_com_docker_compose_oneoff":           "False",
+					"__meta_docker_container_label_com_docker_compose_project":          "crowserver",
+					"__meta_docker_container_label_com_docker_compose_service":          "crow-server",
+					"__meta_docker_container_label_com_docker_compose_version":          "1.11.2",
+					"__meta_docker_container_name":                                      "/crow-server",
+					"__meta_docker_container_network_mode":                              "bridge",
+					"__meta_docker_network_id":                                          "1dd8d1a8bef59943345c7231d7ce8268333ff5a8c5b3c94881e6b4742b447634",
+					"__meta_docker_network_ingress":                                     "false",
+					"__meta_docker_network_internal":                                    "false",
+					"__meta_docker_network_ip":                                          "172.17.0.2",
+					"__meta_docker_network_name":                                        "bridge",
+					"__meta_docker_network_scope":                                       "local",
+					"__meta_docker_port_private":                                        "8080",
+					"__meta_docker_port_public":                                         "18081",
+					"__meta_docker_port_public_ip":                                      "0.0.0.0",
+				},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			labelsMap := addContainersLabels([]container{tt.c}, networkLabels, 80)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("addContainersLabels() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(labelsMap, tt.want) {
+				t.Errorf("addContainersLabels() \ngot  %v, \nwant %v", labelsMap, tt.want)
+			}
+		})
+	}
+}

lib/promscrape/discovery/docker/docker.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"fmt"
@@ -7,19 +7,18 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/proxy"
 )
 
-// SDConfig represents docker swarm service discovery configuration
+// DockerSDConfig defines the `docker_sd` section for Docker based discovery
 //
-// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config
-type SDConfig struct {
+// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#docker_sd_config
+type DockerSDConfig struct {
 	Host    string   `yaml:"host"`
-	Role    string   `yaml:"role"`
 	Port    int      `yaml:"port,omitempty"`
 	Filters []Filter `yaml:"filters,omitempty"`
 
 	HTTPClientConfig  promauth.HTTPClientConfig  `yaml:",inline"`
 	ProxyURL          proxy.URL                  `yaml:"proxy_url,omitempty"`
 	ProxyClientConfig promauth.ProxyClientConfig `yaml:",inline"`
-	// refresh_interval is obtained from `-promscrape.dockerswarmSDCheckInterval` command-line option
+	// refresh_interval is obtained from `-promscrape.dockerSDCheckInterval` command-line option
 }
 
 // Filter is a filter, which can be passed to SDConfig.
@@ -28,25 +27,16 @@ type Filter struct {
 	Values []string `yaml:"values"`
 }
 
-// GetLabels returns dockerswarm labels according to sdc.
-func (sdc *SDConfig) GetLabels(baseDir string) ([]map[string]string, error) {
-	cfg, err := getAPIConfig(sdc, baseDir)
+// GetLabels returns docker labels according to sdc.
+func (sdc *DockerSDConfig) GetLabels(baseDir string) ([]map[string]string, error) {
+	cfg, err := getAPIConfigFromDockerSDConfig(sdc, baseDir)
 	if err != nil {
 		return nil, fmt.Errorf("cannot get API config: %w", err)
 	}
-	switch sdc.Role {
-	case "tasks":
-		return getTasksLabels(cfg)
-	case "services":
-		return getServicesLabels(cfg)
-	case "nodes":
-		return getNodesLabels(cfg)
-	default:
-		return nil, fmt.Errorf("unexpected `role`: %q; must be one of `tasks`, `services` or `nodes`; skipping it", sdc.Role)
-	}
+	return getContainersLabels(cfg)
 }
 
 // MustStop stops further usage for sdc.
-func (sdc *SDConfig) MustStop() {
+func (sdc *DockerSDConfig) MustStop() {
 	configMap.Delete(sdc)
 }

lib/promscrape/discovery/docker/dockerswarm.go

@@ -0,0 +1,37 @@
+package docker
+
+import (
+	"fmt"
+)
+
+// DockerSwarmSDConfig represents docker swarm service discovery configuration
+//
+// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config
+type DockerSwarmSDConfig struct {
+	Role           string `yaml:"role"`
+	DockerSDConfig `yaml:",inline"`
+	// refresh_interval is obtained from `-promscrape.dockerswarmSDCheckInterval` command-line option
+}
+
+// GetLabels returns dockerswarm labels according to sdc.
+func (sdc *DockerSwarmSDConfig) GetLabels(baseDir string) ([]map[string]string, error) {
+	cfg, err := getAPIConfigFromDockerSwarmSDConfig(sdc, baseDir)
+	if err != nil {
+		return nil, fmt.Errorf("cannot get API config: %w", err)
+	}
+	switch sdc.Role {
+	case "tasks":
+		return getTasksLabels(cfg)
+	case "services":
+		return getServicesLabels(cfg)
+	case "nodes":
+		return getNodesLabels(cfg)
+	default:
+		return nil, fmt.Errorf("unexpected `role`: %q; must be one of `tasks`, `services` or `nodes`; skipping it", sdc.Role)
+	}
+}
+
+// MustStop stops further usage for sdc.
+func (sdc *DockerSwarmSDConfig) MustStop() {
+	configMap.Delete(sdc)
+}

lib/promscrape/discovery/docker/network.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"encoding/json"
@@ -18,18 +18,18 @@ type network struct {
 	Labels   map[string]string
 }
 
-func getNetworksLabelsByNetworkID(cfg *apiConfig) (map[string]map[string]string, error) {
+func getNetworksLabels(cfg *apiConfig, labelPrefix string) (map[string]map[string]string, error) {
 	networks, err := getNetworks(cfg)
 	if err != nil {
 		return nil, err
 	}
-	return getNetworkLabelsByNetworkID(networks), nil
+	return getNetworkLabelsGroupByNetworkID(networks, labelPrefix), nil
 }
 
 func getNetworks(cfg *apiConfig) ([]network, error) {
 	resp, err := cfg.getAPIResponse("/networks")
 	if err != nil {
-		return nil, fmt.Errorf("cannot query dockerswarm api for networks: %w", err)
+		return nil, fmt.Errorf("cannot query docker/dockerswarm api for networks: %w", err)
 	}
 	return parseNetworks(resp)
 }
@@ -42,18 +42,18 @@ func parseNetworks(data []byte) ([]network, error) {
 	return networks, nil
 }
 
-func getNetworkLabelsByNetworkID(networks []network) map[string]map[string]string {
+func getNetworkLabelsGroupByNetworkID(networks []network, labelPrefix string) map[string]map[string]string {
 	ms := make(map[string]map[string]string)
 	for _, network := range networks {
 		m := map[string]string{
-			"__meta_dockerswarm_network_id":       network.ID,
-			"__meta_dockerswarm_network_name":     network.Name,
-			"__meta_dockerswarm_network_internal": strconv.FormatBool(network.Internal),
-			"__meta_dockerswarm_network_ingress":  strconv.FormatBool(network.Ingress),
-			"__meta_dockerswarm_network_scope":    network.Scope,
+			labelPrefix + "network_id":       network.ID,
+			labelPrefix + "network_name":     network.Name,
+			labelPrefix + "network_internal": strconv.FormatBool(network.Internal),
+			labelPrefix + "network_ingress":  strconv.FormatBool(network.Ingress),
+			labelPrefix + "network_scope":    network.Scope,
 		}
 		for k, v := range network.Labels {
-			m["__meta_dockerswarm_network_label_"+discoveryutils.SanitizeLabelName(k)] = v
+			m[labelPrefix+"network_label_"+discoveryutils.SanitizeLabelName(k)] = v
 		}
 		ms[network.ID] = m
 	}

lib/promscrape/discovery/docker/network_test.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"reflect"
@@ -46,7 +46,7 @@ func Test_addNetworkLabels(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got := getNetworkLabelsByNetworkID(tt.args.networks)
+			got := getNetworkLabelsGroupByNetworkID(tt.args.networks, "__meta_dockerswarm_")
 			var networkIDs []string
 			for networkID := range got {
 				networkIDs = append(networkIDs, networkID)

lib/promscrape/discovery/docker/nodes.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"encoding/json"

lib/promscrape/discovery/docker/nodes_test.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"reflect"

lib/promscrape/discovery/docker/services.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"encoding/json"
@@ -51,7 +51,7 @@ func getServicesLabels(cfg *apiConfig) ([]map[string]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	networksLabels, err := getNetworksLabelsByNetworkID(cfg)
+	networksLabels, err := getNetworksLabels(cfg, "__meta_dockerswarm_")
 	if err != nil {
 		return nil, err
 	}

lib/promscrape/discovery/docker/services_test.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"reflect"

lib/promscrape/discovery/docker/tasks.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"encoding/json"
@@ -7,7 +7,6 @@ import (
 	"strconv"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
-
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
 )
 
@@ -45,7 +44,7 @@ func getTasksLabels(cfg *apiConfig) ([]map[string]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	networkLabels, err := getNetworksLabelsByNetworkID(cfg)
+	networkLabels, err := getNetworksLabels(cfg, "__meta_dockerswarm_")
 	if err != nil {
 		return nil, err
 	}

lib/promscrape/discovery/docker/tasks_test.go

@@ -1,4 +1,4 @@
-package dockerswarm
+package docker
 
 import (
 	"reflect"

lib/promscrape/scraper.go

@@ -39,6 +39,9 @@ var (
 	gceSDCheckInterval = flag.Duration("promscrape.gceSDCheckInterval", time.Minute, "Interval for checking for changes in gce. "+
 		"This works only if gce_sd_configs is configured in '-promscrape.config' file. "+
 		"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#gce_sd_config for details")
+	dockerSDCheckInterval = flag.Duration("promscrape.dockerSDCheckInterval", 30*time.Second, "Interval for checking for changes in docker. "+
+		"This works only if docker_sd_configs is configured in '-promscrape.config' file. "+
+		"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#docker_sd_config for details")
 	dockerswarmSDCheckInterval = flag.Duration("promscrape.dockerswarmSDCheckInterval", 30*time.Second, "Interval for checking for changes in dockerswarm. "+
 		"This works only if dockerswarm_sd_configs is configured in '-promscrape.config' file. "+
 		"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config for details")
@@ -114,6 +117,7 @@ func runScraper(configFile string, pushData func(wr *prompbmarshal.WriteRequest)
 	scs.add("dns_sd_configs", *dnsSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDNSSDScrapeWork(swsPrev) })
 	scs.add("ec2_sd_configs", *ec2SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getEC2SDScrapeWork(swsPrev) })
 	scs.add("gce_sd_configs", *gceSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getGCESDScrapeWork(swsPrev) })
+	scs.add("docker_sd_configs", *dockerSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDockerSDScrapeWork(swsPrev) })
 	scs.add("dockerswarm_sd_configs", *dockerswarmSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDockerSwarmSDScrapeWork(swsPrev) })
 	scs.add("digitalocean_sd_configs", *digitaloceanSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDigitalOceanDScrapeWork(swsPrev) })
 	scs.add("http_sd_configs", *http.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getHTTPDScrapeWork(swsPrev) })