package server import ( "context" "io/ioutil" "os" "path/filepath" "time" "github.com/rancher/k3s/pkg/etcd" "github.com/sirupsen/logrus" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" ) // setETCDLabelsAndAnnotations will set the etcd role label if not exists also it // sets special annotaitons on the node object which are etcd node id and etcd node // address, the function will also remove the controlplane and master role labels if // they exist on the node func setETCDLabelsAndAnnotations(ctx context.Context, config *Config) error { t := time.NewTicker(5 * time.Second) defer t.Stop() for range t.C { controlConfig := &config.ControlConfig sc, err := NewContext(ctx, controlConfig.Runtime.KubeConfigAdmin) if err != nil { logrus.Infof("Failed to set etcd role label: %v", err) continue } if err := sc.Start(ctx); err != nil { logrus.Infof("Failed to set etcd role label: %v", err) continue } controlConfig.Runtime.Core = sc.Core nodes := sc.Core.Core().V1().Node() nodeName := os.Getenv("NODE_NAME") if nodeName == "" { logrus.Info("Failed to set etcd role label: node name not set") continue } node, err := nodes.Get(nodeName, metav1.GetOptions{}) if err != nil { logrus.Infof("Failed to set etcd role label: %v", err) continue } if node.Labels == nil { node.Labels = make(map[string]string) } // remove controlplane label if role label exists var controlRoleLabelExists bool if _, ok := node.Labels[MasterRoleLabelKey]; ok { delete(node.Labels, MasterRoleLabelKey) controlRoleLabelExists = true } if _, ok := node.Labels[ControlPlaneRoleLabelKey]; ok { delete(node.Labels, ControlPlaneRoleLabelKey) controlRoleLabelExists = true } if v, ok := node.Labels[ETCDRoleLabelKey]; ok && v == "true" && !controlRoleLabelExists { break } node.Labels[ETCDRoleLabelKey] = "true" // this is replacement to the etcd controller handleself function if node.Annotations == nil { node.Annotations = map[string]string{} } fileName := filepath.Join(controlConfig.DataDir, "db", "etcd", "name") data, err := ioutil.ReadFile(fileName) if err != nil { logrus.Infof("Waiting for etcd node name file to be available: %v", err) continue } etcdNodeName := string(data) node.Annotations[etcd.NodeNameAnnotation] = etcdNodeName address, err := etcd.GetAdvertiseAddress(controlConfig.PrivateIP) if err != nil { logrus.Infof("Waiting for etcd node address to be available: %v", err) continue } node.Annotations[etcd.NodeAddressAnnotation] = address _, err = nodes.Update(node) if err == nil { logrus.Infof("Successfully set etcd role label and annotations on node %s", nodeName) break } select { case <-ctx.Done(): return ctx.Err() } } return nil }