k8s.io/kubernetes@v1.31.0-alpha.0.0.20240520171757-56147500dadc/pkg/proxy/node.go (about) 1 /* 2 Copyright 2022 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package proxy 18 19 import ( 20 "context" 21 "reflect" 22 "sync" 23 24 v1 "k8s.io/api/core/v1" 25 "k8s.io/klog/v2" 26 "k8s.io/kubernetes/pkg/proxy/config" 27 "k8s.io/kubernetes/pkg/proxy/healthcheck" 28 ) 29 30 // NodePodCIDRHandler handles the life cycle of kube-proxy based on the node PodCIDR assigned 31 // Implements the config.NodeHandler interface 32 // https://issues.k8s.io/111321 33 type NodePodCIDRHandler struct { 34 mu sync.Mutex 35 podCIDRs []string 36 logger klog.Logger 37 } 38 39 func NewNodePodCIDRHandler(ctx context.Context, podCIDRs []string) *NodePodCIDRHandler { 40 return &NodePodCIDRHandler{ 41 podCIDRs: podCIDRs, 42 logger: klog.FromContext(ctx), 43 } 44 } 45 46 var _ config.NodeHandler = &NodePodCIDRHandler{} 47 48 // OnNodeAdd is a handler for Node creates. 49 func (n *NodePodCIDRHandler) OnNodeAdd(node *v1.Node) { 50 n.mu.Lock() 51 defer n.mu.Unlock() 52 53 podCIDRs := node.Spec.PodCIDRs 54 // initialize podCIDRs 55 if len(n.podCIDRs) == 0 && len(podCIDRs) > 0 { 56 n.logger.Info("Setting current PodCIDRs", "podCIDRs", podCIDRs) 57 n.podCIDRs = podCIDRs 58 return 59 } 60 if !reflect.DeepEqual(n.podCIDRs, podCIDRs) { 61 n.logger.Error(nil, "Using NodeCIDR LocalDetector mode, current PodCIDRs are different than previous PodCIDRs, restarting", 62 "node", klog.KObj(node), "newPodCIDRs", podCIDRs, "oldPodCIDRs", n.podCIDRs) 63 klog.FlushAndExit(klog.ExitFlushTimeout, 1) 64 } 65 } 66 67 // OnNodeUpdate is a handler for Node updates. 68 func (n *NodePodCIDRHandler) OnNodeUpdate(_, node *v1.Node) { 69 n.mu.Lock() 70 defer n.mu.Unlock() 71 podCIDRs := node.Spec.PodCIDRs 72 // initialize podCIDRs 73 if len(n.podCIDRs) == 0 && len(podCIDRs) > 0 { 74 n.logger.Info("Setting current PodCIDRs", "podCIDRs", podCIDRs) 75 n.podCIDRs = podCIDRs 76 return 77 } 78 if !reflect.DeepEqual(n.podCIDRs, podCIDRs) { 79 n.logger.Error(nil, "Using NodeCIDR LocalDetector mode, current PodCIDRs are different than previous PodCIDRs, restarting", 80 "node", klog.KObj(node), "newPodCIDRs", podCIDRs, "oldPODCIDRs", n.podCIDRs) 81 klog.FlushAndExit(klog.ExitFlushTimeout, 1) 82 } 83 } 84 85 // OnNodeDelete is a handler for Node deletes. 86 func (n *NodePodCIDRHandler) OnNodeDelete(node *v1.Node) { 87 n.logger.Error(nil, "Current Node is being deleted", "node", klog.KObj(node)) 88 } 89 90 // OnNodeSynced is a handler for Node syncs. 91 func (n *NodePodCIDRHandler) OnNodeSynced() {} 92 93 // NodeEligibleHandler handles the life cycle of the Node's eligibility, as 94 // determined by the health server for directing load balancer traffic. 95 type NodeEligibleHandler struct { 96 HealthServer *healthcheck.ProxierHealthServer 97 } 98 99 var _ config.NodeHandler = &NodeEligibleHandler{} 100 101 // OnNodeAdd is a handler for Node creates. 102 func (n *NodeEligibleHandler) OnNodeAdd(node *v1.Node) { n.HealthServer.SyncNode(node) } 103 104 // OnNodeUpdate is a handler for Node updates. 105 func (n *NodeEligibleHandler) OnNodeUpdate(_, node *v1.Node) { n.HealthServer.SyncNode(node) } 106 107 // OnNodeDelete is a handler for Node deletes. 108 func (n *NodeEligibleHandler) OnNodeDelete(node *v1.Node) { n.HealthServer.SyncNode(node) } 109 110 // OnNodeSynced is a handler for Node syncs. 111 func (n *NodeEligibleHandler) OnNodeSynced() {}