mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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133b288681
Previously multiple scrape jobs could create multiple watchers for the same apiURL. Now only a single watcher is used. This should reduce load on Kubernetes API server when many scrape job configs use Kubernetes service discovery.
83 lines
2.7 KiB
Go
83 lines
2.7 KiB
Go
package kubernetes
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import (
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"fmt"
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"net"
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"os"
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"strings"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
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)
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// apiConfig contains config for API server
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type apiConfig struct {
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aw *apiWatcher
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}
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func (ac *apiConfig) mustStop() {
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ac.aw.mustStop()
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}
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var configMap = discoveryutils.NewConfigMap()
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func getAPIConfig(sdc *SDConfig, baseDir string, swcFunc ScrapeWorkConstructorFunc) (*apiConfig, error) {
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v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(sdc, baseDir, swcFunc) })
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if err != nil {
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return nil, err
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}
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return v.(*apiConfig), nil
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}
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func newAPIConfig(sdc *SDConfig, baseDir string, swcFunc ScrapeWorkConstructorFunc) (*apiConfig, error) {
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switch sdc.Role {
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case "node", "pod", "service", "endpoints", "endpointslices", "ingress":
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default:
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return nil, fmt.Errorf("unexpected `role`: %q; must be one of `node`, `pod`, `service`, `endpoints`, `endpointslices` or `ingress`", sdc.Role)
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}
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ac, err := promauth.NewConfig(baseDir, sdc.BasicAuth, sdc.BearerToken, sdc.BearerTokenFile, sdc.TLSConfig)
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if err != nil {
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return nil, fmt.Errorf("cannot parse auth config: %w", err)
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}
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apiServer := sdc.APIServer
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if len(apiServer) == 0 {
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// Assume we run at k8s pod.
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// Discover apiServer and auth config according to k8s docs.
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// See https://kubernetes.io/docs/reference/access-authn-authz/service-accounts-admin/#service-account-admission-controller
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host := os.Getenv("KUBERNETES_SERVICE_HOST")
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port := os.Getenv("KUBERNETES_SERVICE_PORT")
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if len(host) == 0 {
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return nil, fmt.Errorf("cannot find KUBERNETES_SERVICE_HOST env var; it must be defined when running in k8s; " +
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"probably, `kubernetes_sd_config->api_server` is missing in Prometheus configs?")
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}
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if len(port) == 0 {
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return nil, fmt.Errorf("cannot find KUBERNETES_SERVICE_PORT env var; it must be defined when running in k8s; "+
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"KUBERNETES_SERVICE_HOST=%q", host)
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}
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apiServer = "https://" + net.JoinHostPort(host, port)
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tlsConfig := promauth.TLSConfig{
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CAFile: "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt",
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}
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acNew, err := promauth.NewConfig(".", nil, "", "/var/run/secrets/kubernetes.io/serviceaccount/token", &tlsConfig)
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if err != nil {
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return nil, fmt.Errorf("cannot initialize service account auth: %w; probably, `kubernetes_sd_config->api_server` is missing in Prometheus configs?", err)
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}
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ac = acNew
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}
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if !strings.Contains(apiServer, "://") {
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proto := "http"
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if sdc.TLSConfig != nil {
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proto = "https"
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}
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apiServer = proto + "://" + apiServer
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}
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for strings.HasSuffix(apiServer, "/") {
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apiServer = apiServer[:len(apiServer)-1]
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}
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aw := newAPIWatcher(apiServer, ac, sdc, swcFunc)
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cfg := &apiConfig{
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aw: aw,
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}
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return cfg, nil
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}
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