Kubernetes clusterip These pods internal-pod-a, internal-pod-b, internal-pod-c serve for internal needs only. 168. 6)，而不需要任何自动化。我相信对于像我这样的初学者来说，这是一个获得亲身 在 Kubernetes 中，Service 是用于将流量路由到一组 Pod 的抽象层。Service 有三种类型：ClusterIP、NodePort 和 LoadBalancer。其中，ClusterIP 是默认类型，它只能在集 Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Before you begin Install kubectl. local is the kubernetes Dokumen ini menjelaskan bagaimana cara membuat objek Service Kubernetes yang mengekspos alamat IP eksternal. ClusterIP是Kubernetes默认的服务类型。当您创建一个Service资源对象而没有指定服务类型时，默认会被设置为ClusterIP类型。这种类型的服务仅 The architectural concepts behind Kubernetes. 97. 0. 15. 4:3306 Session Affinity: None You need your Intro 오늘은 쿠버네티스의 Pod로 접근하기위해 네트워크에 노출시키는 Service에 대해 설명하고자 합니다. 10:8085,172. The control plane's components make global decisions about the cluster (for example, scheduling), Kubernetes » Monitoring Kubernetes Cluster dengan Prometheus Grafana (kube-prometheus-stack) Setup Informations: server-01 : 192. i need to change the below configuration via CLI the http port to https port the port number the type to Load Balancer Is there a way to do 然后，根据Service名称和端口号，Traefik会通过Kubernetes的API server获取Service的ClusterIP和端口号，并将请求转发到这个ClusterIP和端口上。 Kubernetes作为容 Ref- Difference between kubernetes service types ClusterIP Service Type Flow Here the internal client will call the service port 80 on which the kubernetes service is deployed 详细看这里 ClusterIP：默认值，它是Kubernetes系统自动分配的虚拟IP，只能在集群内部访问 NodePort：将Service通过指定的Node上的端口暴露给外部，通过此方法，就可 ¿Cuándo usar un NodePort en Kubernetes? Tal y como hemos comentado antes, el uso de NodePort va a dar acceso a través de la red a tu servicio, por lo que para entornos 文章浏览阅读3. 96. The documentation says:. MySQL Operator for Kubernetes manages the full lifecycle with setup and I am deploying a mongo express pod which talks to mong db pod via internal service (clusterIP). Kubernetes is an open-source platform and is How to get client IP address from inside a Azure Kubernetes with a ClusterIP service. Use a cloud provider like Google ClusterIp is "None" when you want to create a headless service. And queues are created via stomp producer. How to get the client ip inside the pod without cloud provider or LB. In Kubernetes, a Service Create a ClusterIP service with the specified name. 0. The NodePort type allows to proxy the service over its node port, which is open on the IP of every node. Example: apiVersion: v1 kind: Service metadata: name: myawesomeservice このページではKubernetesによるDNSサポートについて概観します。 イントロダクション KubernetesのDNSはクラスター上でDNS PodとServiceをスケジュールし、DNSの This page shows how to use kubectl port-forward to connect to a MongoDB server running in a Kubernetes cluster. clusterIP: invalid value '': the provided range does not match the current range At The answer depends on DB type you are using. Open an . cluster. The name of an Ingress object must be a valid DNS subdomain name. クラスター内部のIPでServiceを公開する。このタイプではServiceはクラスター内部からのみ疎通性があります。 ClusterIP: Internal Only. 80 selector: So in summary (and in order to redirect the traffic from the outside world to your k8s clusterIp service): Do you need a Load balancer to make your kind:Ingress works ? Yes, this is I have a k8s service of type clusterIP. 서비스는 (type: ClusterIP인 서비스를 통해) 클러스터-범위의 가상 IP 주소를 가진다. If you have a specific, answerable question about how to use Kubernetes, ask it on Stack Overflow. ClusterIP is a Kubernetes Service type that exposes the Service on an internal IP within the cluster. How can I point my Nginx instance at the ClusterIP service for another pod? Hot Network Questions ClusterIPはPodへの接続を実現するためのKubernetesのリソースです。 とあるアプリケーションが10個のPodで動作している場合に、その中のどれか1つにアクセスするときのVIPとしてClusterIPが存在します。 通信の流 How do you find the cluster/service CIDR for a Kubernetes cluster, once it is already running? I know for Minikube, it is 10. When you create the SVC in to Kubernetes with type ClusterIP it assigns the Virtual IP to Feedback. You It looks like you can specify the clusterIP field under spec on a ClusterIP kind service. Understanding the differences between ClusterIP, NodePort, and LoadBalancer services in Kubernetes is crucial for efficiently managing your applications. How can I expose a service, so that I can access the service via a browser on my Mac? AGE kubernetes It looks like the answer is present in the StatefulSet Basics documentation section Using Stable Network Identities:. Today I am excited to discuss Kubernetes services in more detail by venturing into the role of ClusterIP as one of the prominent services to enable communications of multiple pods within the ClusterIP: Exposes the service on a cluster-internal IP, accessible only within the cluster. Basically what happens is when you create a kind: service object, ClusterIP is the most common Service as well as it is the Default type of Service, meaning when you create a Service and not specify a type it will automatically take ClusterIP I'm running a local kubernetes bundled with docker on Mac OS. kubernetes. Are all backends affected by NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE cluster-ip-service ClusterIP 10. Node overprovisioning is a strategy that proactively reserves a portion of 初学k8s,对集群里面的IP真的不是很理解，一会是PodIP,一会是ClusterIP,总结一下这些IP。 Kubernetes集群里有三种IP Kubernetes在其所有节点上开放一个端口给外部访 Today I am excited to discuss Kubernetes services in more detail by venturing into the role of ClusterIP as one of the prominent services to enable communications of multiple The Kubernetes network model. But when you curl clusterIP+port, then the iptables rule You can not access the clusterIP from outside the cluster, nodeport is the port open on your node which will redirect to your clusterIP, hence even if you're accessing from outside このページでは、外部IPアドレスを公開するKubernetesのServiceオブジェクトを作成する方法を示します。 始める前に kubectlをインストールしてください。 Kubernetesク 위의 주어진 서비스 "busybox-subdomain"과 spec. 149 Kubernetes. subdomain to "busybox-subdomain", the first Pod will see its own FQDN as "busybox A ClusterIP exposes the following: spec. Requires ingress resource & ingress controller to receive external traffic. The Kubernetes project recommends upgrading to the latest patch Kubernetes ClusterIP service reachable from outside the cluster? 0. --as-group strings: Group to impersonate for the 有时不需要或不想要负载均衡，以及单独的 Service IP。遇到这种情况，可以通过指定 Cluster IP（spec. Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must Une manière abstraite d'exposer une application s'exécutant sur un ensemble de Pods en tant que service réseau. 223:6443 8d kubectl get svc. kubectl create service clusterip NAME [--tcp=<port>:<targetPort>] [--dry-run=server|client|none] Examples # A cluster is a set of nodes (physical or virtual machines) running Kubernetes agents, managed by the control plane. ipFamilyPolicy 设置为 PreferDualStack。当你在双栈集群上创建此 Service 时，Kubernetes 会为此 Service 分配 IPv4 和 IPv6 地址。 控制平面更 This page shows how to create a Kubernetes Service object that exposes an external IP address. It is accessible from its spec. AGE quickstart-es-http ClusterIP 10. Although, it's technically possible to specify a service address range within the same virtual network as ClusterIP is the default service type in Kubernetes which allows you to reach your service only within the cluster. Your service will be exposed on a ClusterIP unless you manually define another type. Ingress routing not working for services deployed with helm. For general information about working Edit kubernetes-dashboard service. AKS. Kubernetes - connection refuse This comprehensive guide on Kubernetes architecture aims to explain each Kubernetes component workflow in detail with animated illustrations. Control plane components. 251. Google Kubernetes Engine 또는 Kubernetes的service有三种类型：ClusterIP，NodePort，LoadBalancer，今天我们来看看ClusterIP。 创建Deployment 首先我们先创建一个Deployment，这个Deployment是一 Kubernetes uses iptables to distribute traffic across a set of pods, as officially explained by kubernetes. Provide details and share your research! But avoid . targetPort is set it will route from the port to the 可以在Pod内部以Service的域名的方式，访问集群内部的无状态服务，或者以变量的方式来访问，一般不会以ClusterIP的方式来访问，因为需要Service创建后，Kubernetes才 If you want to expose the service externally, you will need a service that is ClusterIP backed whether that be a NodePort or LoadBalancer; even if you use ingress, you will need to 文章浏览阅读6k次。本文记录了一位用户在使用 Kubernetes 的 ClusterIP 网络类型时遇到的问题，即服务、网络状态正常，但通过 curl 访问 ClusterIP 映射的端口无法成功。经 每个服务都分配有一个类型——ClusterIP、NodePort 或 LoadBalancer。这些定义了外部流量如何到达服务。 集群IP. It provides a stable IP address for accessing the Pods that are part of the --as string: Username to impersonate for the operation. 用語 ClusterIP. 193 <none> 80/TCP 10m kubernetes ClusterIP 10. 그러나 pod의 ip는 고정 되어 있지 않습니다. weighted routing is a bit beyond the ClusterIP. Currently, I'm trying to create a Kubernetes cluster on Google Cloud with two load balancers: one for backend (in Spring boot) and another for frontend (in Angular), where each KubernetesにおけるServiceとは、 クラスター内で1つ以上のPodとして実行されているネットワークアプリケーションを公開する方法です。 Kubernetesでは、なじみのない 文章浏览阅读2k次，点赞31次，收藏15次。集群内部通信：ClusterIP 为 Service 提供了一个虚拟的内部 IP 地址，用于在 Kubernetes 集群内的其他组件和服务之间进行通信。其他 Pod 可以通 Whether prompt, What linked in kubernetes this message: The Service "skudns" is invalid:spec. 222. をPodに接続しておけばService IPでPodへのアクセスが可能になります。 Podは性能障害またはKubernetes障害など 在 Kubernetes 中，NodePort 类型的 Service 允许用户通过每个节点的 IP 地址和指定的端口访问应用程序。 如果 NodePort 类型的 Service 无法通过节点的 IP地址和指定端口进行访问，可 二、ClusterIP. While i think Endpoint IP that you got, is might be external and you can access Synopsis Dump cluster information out suitable for debugging and diagnosing cluster problems. Change type: Synopsis Delete the specified cluster from the kubeconfig. NodePort : Exposes the service on a static port on each node’s IP, allowing external Kubernetes 中的 Service 是一种抽象，定义了一组逻辑上的 Pod 以及一种访问这些 Pod 的策略。 即使 Pod 动态扩缩容，Service 也能够保持外部访问的稳定性。Service 通过标签选择器来识别 Pod 并将流量路由给相应的 Pod Kubernetes API Server Bypass Risks (EN) Linux kernel security constraints for Pods and containers (EN) Security Checklist (EN) ClusterIP: 서비스를 클러스터-내부 IP에 Kubernetesでは、ServiceはPodの集合上で実行しているアプリケーションを抽象的に公開する方法です。Serviceはクラスター内で仮想IPアドレス(type: ClusterIPのServiceを ClusterIP ClusterIP is the default Kubernetes service. Kubernetes v1. 1 <none> 「type:CluserIP」のサービスを作ると Kubernetes クラスタ内からのみアクセス可能な仮想 IP が割り振られ、これを ClusterIP という。 やってみる。 Kubernetes完全ガイド impress top 标题：探秘Kubernetes：ClusterIP访问困境与破解之道 在数字化转型的浪潮中，Kubernetes以其强大的容器编排能力，成为了现代IT架构的基石。然而，即便是如此强大的 简介 创建指定名称的 ClusterIP Service。 kubectl create service clusterip NAME [--tcp=<port>:<targetPort>] [--dry-run=server|client|none] 示例 # 新建一个名为 my-cs 的 쿠버네티스에서 서비스는 파드 집합에서 실행되는 애플리케이션을 노출하는 추상적인 방법이다. 16. If web is something external to the kubernetes cluster, it might have sense to access Pods deployed on kubernetes cluster via Kubernetes automates the distribution and scheduling of application containers across a cluster in a more efficient way. **ClusterIP未映射到外部IP**[^1]: 如果 应用上述清单时，系统将创建一个名为 "my-service" 的、 服务类型默认为 ClusterIP 的 Service。 该 Service 指向带有标签 app. The output says "ClusterIP" while you created a "NodePort" service. Example: debugging a down/unreachable node. clusterIp:spec. 162. 3. namespace. You can adjust the amount of I think you've mixed it up a bit. Was this page helpful? Yes No. 1. 18 [stable] This page provides an overview of NodeLocal DNSCache feature in Kubernetes. cpu: Selector: app=mysql Type: ClusterIP IP: 10. 內部服務如何訪問？ 我們知道NodePort是暴露給外部 那內部服務如何訪問？ That is an expected behavior as when we do curl on a Kubernetes Service object, it is expected to pass the requests to only one of the endpoints (IP of the pods). 101. gcloud container clusters [root@server2 ~]# kubectl get svc 查看svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10. 31. NAME TYPE CLUSTER-IP AGE dark-room-dep KUBERNETES_SERVICE_PORT=443 STAGING_POSTGRESQL_SERVICE_HOST=10. In my cluster I have a backend api developed with dropwizard, front end Cluster API is a Kubernetes sub-project focused on providing declarative APIs and tooling to simplify provisioning, upgrading, and operating multiple Kubernetes clusters. There are 4 distinct networking problems to address: Highly Replace failedspec. 11 and later, CoreDNS is recommended and is This page provides an overview of the steps you should follow to upgrade a Kubernetes cluster. 145 <none> ClusterIP Service 是 K8s 提供的內部反向代理. Gunakan The operator automatically creates and manages Kubernetes resources to achieve the desired state of the Elasticsearch cluster. 10 <none> I created a ReplicaSet with replicas = 3. 4w次，点赞3次，收藏10次。转载自麦兜搞ip的博客Kubernetes Service之ClusterIPKubernetes Service ClusterIPKubernetes的service有三种类 WHY & HOW TO. Find type: 如果 从Internet 没法访问 ClusterIP 服务，那么我们为什么要讨论它呢？那是因为我们可以通过 Kubernetes 的 proxy 模式来访问该服务！ 启动 Kubernetes proxy 模式： $ kubectl proxy --port=8080 ; 这样你可以通 Kubernetes lets you configure single-stack IPv4 networking, single-stack IPv6 networking, or dual stack networking with both network families active. If your service type is set as LoadBalancer or NodePort, MySQL Operator for Kubernetes manages MySQL InnoDB Cluster setups inside a Kubernetes Cluster. (a service Unable to access Kubernetes ClusterIP services via nginx-ingress-controller. La intención es permitir a los usuarios personalizar sus Kubernetes requires nodes in your cluster to run pods. How to find 此 Service 规约显式地将 . You cannot ping the Recently i did install kubernetes using kubeadm on my old dual core AMD machine using bionic ubuntu and lxc. Asking for help, Get the service name: kubectl get service -n test URL to a kubernetes service is service-name. Avec Kubernetes, vous n'avez pas besoin de modifier votre application pour utiliser un mécanisme de Synopsis Create a cluster role. Thanks for the feedback. Kubernetes介绍 1. io/name: MyApp 的所有 Pod ClusterIP is local IP that is used internally in the cluster, you can use it to access the application. 17. service란 pod은 자체 ip를 가지고있으며 같은 클러스터 내부라면 해당 ip를 통해 통신을 할 수 있습니다. Then I created a service with ClusterIP type to 文章浏览阅读8k次，点赞6次，收藏23次。本文介绍了Kubernetes Service的四种类型：ClusterIP（集群内访问）、NodePort（外部访问）、LoadBalancer（云服务负载均衡） 我对k8s很陌生，我试图从零开始运行Vagrant (Ubuntu16. 在 kubernetes 中，pod是应用程序的载体，我们可以通过pod的ip来访问应用程序，但是pod的ip地址不是固定的，这也就意味着不方便直接采用pod的ip对服务进 Networking is a central part of Kubernetes, but it can be challenging to understand exactly how it is expected to work. 9. $ kubectl -n kube-system edit service kubernetes-dashboard You should see yaml representation of the service. this is a k8s abstraction for a load Debugging common cluster issues. tech. 2. kubectl create clusterrole NAME --verb=verb --resource=resource. Admin Service — a I am pretty new to kubernetes and I have successfully setup a cluster on google container engine . User could be a regular user or a service account in a namespace. the cluster's control plane automatically picks a free IP address from within Expose an application running in your cluster behind a single outward-facing endpoint, even when the workload is split across multiple backends. kubectl create service clusterip my-cs --tcp=5678:8080. $ kubectl 1. The Kubernetes network model is built out of several pieces: Each pod in a cluster gets its own unique cluster-wide IP address. # Create a new ClusterIP service named my-cs. 32 supports clusters with up to 5,000 Kubernetes 控制平面组件的兼容版本; Kubernetes 系统组件的指标; Kubernetes 对象状态的指标; 系统日志; Kubernetes 系统组件的跟踪; Kubernetes 中的代理; API 优先级和公平性; 集群自动 이 페이지에서는 외부 IP 주소를 노출하는 쿠버네티스 서비스 오브젝트를 생성하는 방법에 대해 설명한다. clusterIp port. This means providing capacity for the workload Pods and for Kubernetes itself. 232 Port: <unset> 3306/TCP TargetPort: 3306/TCP Endpoints: 172. In your service template (yaml file) if clusterIp is set to "None" then cluster-ip is not assigned for your service. (pod에 문제가 생겨 使用Kubernetes clusterIP实现负载均衡的最佳实践与配置指南 引言 在现代微服务架构中，Kubernetes已成为事实上的容器编排标准。其强大的功能之一是内置的负载均衡机制， 文章浏览阅读1. By default, dumps everything to stdout. In Kubernetes version 1. But, when the express pod run it never connects via the service name to I have a Bare-Metal Kubernetes custom setup (manually setup cluster using Kubernetes the Hard Way). ClusterIP is ideal for internal communication within the cluster, By utilizing ClusterIP services, you can efficiently manage internal communications in your Kubernetes clusters without exposing unnecessary components to the outside world. For GKE, you can find out via. The Pods’ ordinals, hostnames, SRV records, and A record Setting up docker (ubuntu 16. A pod has As far as I know, the Kubernetes service in the default namespace is a service which forwards requests to the Kubernetes master (typically Kubernetes API server). One or more pods that match a label selector can forward traffic to the IP address. as you said yourself, its time for a new player to enter the game - an ingress controller. ClusterIP 是默认的 Kubernetes 服务。除非您手动定义另一种类型，否则 Unable to access Kubernetes ClusterIP services via nginx-ingress-controller. 04)中的3节点(主+2工人)集群(v1. spec. A ClusterIP provides network Kubernetes基礎(5)：Service-ClusterIP, NodePort, LoadBalancer. External traffic cannot hit a service of type ClusterIP directly. kubernetes; activemq-artemis; kubernetes 我在使用ClusterIP网络使用的时候，遇见一个问题，就是服务、网络、状态都没有问题，但是我的Clusterl映射的端口就是用curl访问不到。下面是我排查的一个流程，在这里说 ClusterIP of Services, on the other will be allocated from the Kubernetes Service Address Range, discussed above. 1 应用部署方式演变 在部署应用程序的方式上，主要经历了三个时代： 传统部署：互联网早期，会直接将应用程序部署在物理机上 优点：简单， In order to expose Dashboard using NodePort you need to edit kubernetes-dashboard service. kubectl config delete-cluster NAME Examples # Delete the minikube cluster kubectl config delete-cluster minikube If the service used iptables to implement, then the clusterIp cannot ping, because iptables just only permit tcp packet. Each one lets you expose The ClusterIP provides a load-balanced IP address. # Create a new Kubernetes supports several ways of getting external traffic into your cluster. 202 - controller server-02 : In nutshell: currently, depending on the proxy mode, for ClusterIP it's just round robin/random. local:service-port where cluster. subdomain이 "busybox-subdomain"으로 설정된 파드에서, 첫번째 파드는 다음과 같은 자기 자신의 FQDN을 확인하게 当服务 type 设置为 LoadBalancer 时，Kubernetes 向集群中的 Pod 提供的功能等同于 type 设置为 ClusterIP，并通过使用托管了相关 Kubernetes Pod 的节点作为条目对负载 Este documento cataloga las diferentes vías de comunicación entre el kube-apiserver y el clúster de Kubernetes. Sometimes when debugging it can be useful to look at the status of a node -- for example, Hi All, Please help answer, I am curious why we have “Kubernetes” service in default namespace? $ k get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE This page guides you through configuring Node overprovisioning in your Kubernetes cluster. Started by the kubectl get services -o wide redis-cluster ClusterIP 10. You can optionally specify a Synopsis Create a ClusterIP service with the specified name. port; You can only access this service while inside the cluster. 66. 1. This is my lxc profile which i found in web: config: limits. Ceci est défini par le paramètre service-cluster-ip-range dans le serveur d'API Kubernetes. Sebelum kamu memulai Instal kubectl. It's done by kube-proxy, which runs on each nodes, proxies UDP and TCP and Yes, service type ClusterIP uses kube-proxy's iptables rules to distribute the requests roughly evenly in a round robin manner. AGE coredns-primary ClusterIP 10. ports[*]. io. 98. FEATURE STATE: Kubernetes v1. Generally Service is just an abstract way to expose an application running on a set of Pods as a network service. 1 <none> 443/TCP 6d1h Learn about Kubernetes cluster and create a simple cluster using Minikube. 04 only) (warning : change inverted commas in commands while copy pasting :P) Install the maximum supported version of docker by Kubernetes offers a DNS cluster addon, which most of the supported environments enable by default. 3. 9:8085 19h kubernetes 10. This type of connection can be useful for database The problem is that I expected this to also happen with kubernetes clusterIp service on default namespace: NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 1 Service介绍. . One of its key features is service abstraction, which allows users to expose their NAME ENDPOINTS AGE dark-room-dep 172. kubectl -n kube-system edit service kubernetes-dashboard. 1k次，点赞2次，收藏6次。在Kubernetes中，Headless Service和ClusterIP Service都是Service资源的类型，它们都用于为应用程序提供服务发现和负载均衡等 La valeur clusterIp doit être une adresse IP valide dans la plage configurée pour votre cluster. 서비스를 네트워크에 어떤 방식으로 노출 시킬 것인가에 따라서 타입이 文章浏览阅读7k次，点赞7次，收藏23次。本文详细介绍了如何在Kubernetes中使用ClusterIP和服务节点端口(NodePort)创建Service，包括部署、配置与访问。通过实例展示， An Ingress needs apiVersion, kind, metadata and spec fields. clusterIP）的值为 "None" 来创建 Headless Service。 您可以使用 Kubernetes 1. If a spec. 167 <none> 6379/TCP,16379/TCP 22h app=redis-cluster When connecting to the cluster IP from the node Yes, you will be able to access the ClusterIP from Kubernetes worker nodes. group [--resource-name=resourcename] [--dry-run=server|client|none] 前回はKubernetesのクラスタにPodを配置する方法、ReplicaSetやDeploymentの違いについて整理しました。前回まではPodを配置しただけで、まだクラスタ外部へ公開さ Default Service — a ClusterIP service for application neo4j/bolt and http(s) connections to the Neo4j database, originating from inside the Kubernetes cluster. Kubernetes ingress is not working , default backend 404. ClusterIPs, NodePorts, and Ingresses are three widely used resources that all have a role in routing traffic. So all the What I currently use is a kubernetes clusterip service I created that splits traffics to pods. Improve this question. 238. By default, the Given the above Service "busybox-subdomain" and the Pods which set spec. 1/24. When Kubernetes needs to assign a virtual IP address for a Service,that assignment happens one of two ways: dynamically 1. clusterIP: invalid value '': field is immutable kubernetes; google-kubernetes-engine; Share. 시작하기 전에 kubectl을 설치한다. svc. The ClusterIP service must define one or In this tutorial, we’ll delve into the three primary service types in Kubernetes – ClusterIP, NodePort, and LoadBalancer, exploring their benefits and limitations and understanding best practices for their usage. 122. If you have more that one pod running for Kubernetes is a powerful tool for container orchestration, enabling the easy management and deployment of containerized applications. まぁ 1 行で表すなら iptables でできてます。(ほんとは kube-proxy で構成されていて、それが iptables モードで動いてることがおおい、ということ 宿主机ping clusterIP报Destination Port Unreachable通常意味着尝试访问的服务端口并未开放或不可达。这可能是由于以下几个原因： 1.
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