All Questions
Tagged with kubernetes domain-name-system
50
questions
0
votes
1
answer
57
views
Custom changes in Core DNS (Kube-DNS) in OKE (Oracle Cloud Kubernetes) are reverted automatically after one day
I have created an Enhanced Cluster of Kubernetes (OKE) in Oracle Cloud (OCI). Some cluster pods connect to VM instances outside OKE but in the same VCN subnet as the pods.
I want these connections to ...
- 101
0
votes
1
answer
63
views
Containers can't resolve hostname rke2 cluster
I am currently running into a problem around connecting to websites from an rke2 container. Whenever I try to connect to a site from inside of a container I receive an unknown host error. for example ...
- 1
0
votes
1
answer
82
views
How do Fargate pods locate CoreDNS?
How do Kubernetes serverless pods (EKS Fargate) know the IP address to access the cluster's DNS server (the CoreDNS service deployment)?
I recently updated a Kubernetes cluster to set up serverless ...
- 141
0
votes
1
answer
202
views
how to ingress correctly in kuberenetes with nginx-ingress
I'm new to k8s and I'm having slight trouble setting up a local cluster on virtual machines and have it be accessible from at least my host machine.
setup.
I've a local cluster consisting of three ...
- 131
0
votes
0
answers
106
views
dns problems in self managed aws ec2 cluster with aws-vpc-cni
I'm new to k8s and I've been trying to learn it. I faced a problem with trying to setup aws-vpc-k8s-cni on my fresh k8s cluster with coredns. Here's the problem in detail.
Cluster & Network ...
- 131
1
vote
1
answer
77
views
In kubernetes DNS queries fail between nodes
I have an issue with kubernetes and coreDNS that I am not able to solve.
System information
1 master + 2 workers
Red Hat Enterprise Linux release 9.3 (Plow)
k8s: v1.28.7
flannel: v0.24.2
coreDNS: v1....
- 21
2
votes
1
answer
595
views
The pod's /etc/resolv.conf does not reflect the changes on the host
When my pod's dnsPolicy is set to Default it picks up the DNS servers from the host's /run/systemd/resolve/resolv.conf (as configured by the resolvConf flag in Kubernetes) and stores them in /etc/...
- 121
0
votes
0
answers
253
views
Microk8s Cluster - Pods cannot reach nameserver/CoreDNS pod - No route to host
Disclaimer:
This is my first question in ServerFault and I'm a complete noob.
I have the following set up:
remote VM, running CentOS 7, running MicroK8s (v1.28.3).
It's a single-node cluster so I have ...
- 101
0
votes
0
answers
213
views
minikube dns does not resolve on host fedora systemd-resolve
I have setup minikube with the docker driver, but the problem is the same with the virtualbox driver.
I'm on fedora 39 and i followed the explanation here:
https://minikube.sigs.k8s.io/docs/handbook/...
0
votes
0
answers
116
views
DNS Issues with Kubernetes Cluster : no servers could be reached
I'm still experiencing dns and network issues
And I'm at a dead point, looking for hints and suggestions
Summing up :
Following the indications found here : https://kubernetes.io/docs/tasks/administer-...
- 177
0
votes
1
answer
438
views
Coredns does not return the result properly
I configured new Coredns in kubernetes and exposed it to LoadBalancer of service. Also I added a dns server to my local laptop. This is my new zone.
nlabs.hosts nlabs.io:53 {
hosts {
10.0....
- 101
0
votes
0
answers
634
views
Why are my DNS query responses from Technitium failing to make it back to my kubernetes container?
I've explored every nook and cranny I can imagine, and I can't figure out what's going wrong.
I've got a k3s setup on my server where I'm hosting technitium in hostNetwork mode. Technitium is ...
- 1
1
vote
1
answer
333
views
Kubernetes cluster with incorrect DNS resolution
Question Description:
I have a harvester HCI Cluster (RKE2), where pods do not resolve the correct IP addresses for internet domains.
kubectl run debug --image=busybox -i --tty --rm -- sh
/ # ping ...
- 249
3
votes
1
answer
967
views
Kubernetes cluster via kubeadm - CoreDNS buffer size too small / Pods network problems
I am new to deploying on-premise Kubernetes clusters. I managed to deploy one using kubeadm with weave CNI.
Internet connection inside Pods is somewhat sluggish / non-working. I am trying to deploy ...
- 31
1
vote
0
answers
150
views
nslookup weird behavior in 2 pods on the same node in kubernetes
I have 2 containers running in the same namespace.
in-pod dns of the pod xwing does not resolving host name but will resolve FQDN
but in-pod dns of the pod utils resolve it properly.
✗ kgpo
NAME ...
- 835
1
vote
1
answer
375
views
Exposing OpenShift Services to External Domain Using Ingress Controller
I have an OpenShift cluster set up with the default Ingress controller for an internal domain, let's say app.internal.com. I need to expose specific services to the internet and access them via ...
- 11
1
vote
1
answer
487
views
Bad address translation in Kubernetes UDP service by kube-proxy with iptables
For educational purposes, I made myself a Kubernetes cluster according to Kubernetes the Hard Way guide - except I did it on my own set of local VMs rather than using Google Cloud.
Everything seemed ...
- 121
0
votes
1
answer
345
views
Local Kubernetes Dns failure on one of three worker nodes
I have a problem with my Kubernetes on-premise cluster created with kubespray.
I don't know why, but the dns resolutions is not working on one of my three nodes.
I try to mount a debug container to ...
0
votes
0
answers
641
views
DNS resolution is not working in k8 pods after k8 version upgraded to v1.25
We have upgraded our Kubernetes version from v1.24 to v1.25. We have used kubespray (version v1.2.21) for cluster creation. The cluster is upgraded successfully to v1.25. But once we deploy pods, not ...
- 101
0
votes
0
answers
72
views
nslookup output shows result and error within a container
/ $ nslookup aplha-sidecar.pa-beta.beta.cloud
Server: 172.20.0.10
Address: 172.20.0.10:53
Name: aplha-sidecar.pa-beta.beta.cloud
Address: 10.151.62.118
Name: aplha-sidecar.pa-...
0
votes
1
answer
95
views
How to setup DNS so I don't need to change A PTR everytime load balancer IP changes?
How should I setup DNS such that I don't have to change 20 A records for different domains everytime the k8s load balancer IP changes?
Normally I setup an A record called 'k8s.domain.com' that points ...
- 143
2
votes
1
answer
9k
views
It seems like the kubelet isn't running or healthy. [kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with erro
I am trying to do sudo kubeadm init of kubeadm 1.26.0 on an Ubuntu 22.04 machine. But I get the following result:
[init] Using Kubernetes version: v1.26.0
[preflight] Running pre-flight checks
[...
- 427
2
votes
1
answer
1k
views
archlinux: kubernetes - coredns does not work properly
I have installed kubernetes v1.23.0 with Arch Linux as distribution. The cluster consists of a master and a node. Booth systems are KVM based VMs.
When a pod wants to make a DNS query, it gets a ...
- 367
0
votes
1
answer
588
views
Deny direct IP access to an application deployed in Kubernetes
I have a NodeJS application with express.js as a backend framework deployed on cloud using Kubernetes. The K8s runs on top of an Ubuntu template. The application deployed in Kubernetes is of service ...
- 63
0
votes
0
answers
986
views
access my website (Nginx) Through another machine from local network
I work on K3S kuberentes cluster on ubuntu.
Local IP address 192.168.111.2
public IP address : 192.168.20.90
ip loadbalancer : 192.168.111.100
I build an Nginx with the k3sdomain.com domain on my K3S ...
2
votes
1
answer
679
views
How to configure DNS for Services and Pods in Kubernetes?
I have been going through the K8s documentation on DNS for Services and Pods. The main task that I want to resolve is my K8s deployment has NodePort as service type. Meaning, I use the external IP ...
- 63
4
votes
3
answers
8k
views
kubernetes coredns is in CrashLoopBackOff status with "no nameservers found" error
I have tried to build kubernetes using kubeadm on my bare-metal server with containerd as cri, but it seemed that coredns failed to start after installing cni (weave-net).
Two coredns containers are ...
- 393
1
vote
1
answer
11k
views
Trouble with DNS resolution on and Microk8s cluster
My microk8s cluster is running on a centos8 vm and I have some issues with DNS resolution of my pods. Nameserver are at x.x.x.101 and x.x.x.100 both are ping able from within the pods and I can also ...
- 111
1
vote
0
answers
103
views
Kubernetes External DNS
Has anyone configured Kube's external dns project to use an IP other then that of the service or ingress it is creating the record for?
I'm on bare metal and I have:
(Internet) -> (HAProxy) -> (...
- 125
1
vote
2
answers
2k
views
How to clear dns cache for GKE pool from metadata.google.internal?
I have a problem where dns entry for a external domain broke.
The nature of the problem at the time is unknown.
That domain got queried from kubernetes cluster pod in the Google Kubernetes Engine ...
google-cloud-platform
1
vote
1
answer
3k
views
KubeADM cluster: how to configure DNS properly
I have the following project that I use to create my own Kubernetes cluster on the local machine (macOS) via KubeAdm: https://github.com/sasadangelo/k8s-cluster
Basically, I started from this project ...
1
vote
0
answers
131
views
Controlling Egress calls of kubernetes pods based on intermediate host file
Can I modify and use /etc/host.allow file or something similar to restrict the outgoing (egress) calls from my kubernetes pods. If there is intermediate lookup happening while making an egress call ...
- 265
1
vote
0
answers
240
views
Coredns ACL plugin for restricting domain from Kubernetes Pod
How can I use use coredns acl plugin for the domain based access [blocking/allowing] the egress calls ? As per my use case I want to control the outgoing calls from my pod.
something like this :
. {
...
- 265
1
vote
0
answers
483
views
Domain whitelisting in Kubernetes DNS Service
Can I use Kubernetes dns service to whitelist the domains for my pods? I want to restrict the outgoing (egress) calls using Kubernetes dns service. if I can achieve this, can someone let me know the ...
- 265
3
votes
1
answer
6k
views
How to change the hostname on the single-node K8s node
Environments:
OS: Ubuntu 18.04.5 LTS
Kubernetes: v1.16.15
deployment tool: kubeadm v1.16.15
I initialize a single-node K8s on my workstation with the following configuraions:
---
apiVersion: kubeadm....
- 31
0
votes
1
answer
1k
views
Bare metal kubernetes DNS not forwarding
I have a bare metal kubernetes cluster set up for my own education purposes. It's three VMs - one master, two workers, running Ubuntu 20.04. I'm having problems with pods forwarding DNS requests.
...
- 119
0
votes
2
answers
213
views
Single IP to access Kubernetes cluster ingress
I have an amazon EKS cluster that I'm using to host multiple websites, I have an ingress controller and a load balancer that spins up more pods as needed.
I normally use CNAME type "eg alias or ...
- 101
0
votes
0
answers
921
views
Is there a limit on length of CNAME chain in getaddrinfo lookup?
Update 1
I changed the nameserver in /etc/resolv.conf and that fixes the problem, but it will cause issues with internal name resolutions. So what does it mean? dig querying the same NS gets all 7 ...
- 101
0
votes
1
answer
894
views
Kubernetes through Virtualbox; Pods can't access internet services
System:
VirtualBox, Debian 10 Server, Kubernetes with kubeadm
I've setup a deployment and a service and I am exposing it via NodePort but my Pods somehow cant access the internet. The worker node ...
- 111
0
votes
1
answer
5k
views
Kubernetes: kube-dns servers are not reachable (other pods are reachable)
this is an odd one.
I've setup my K8s cluster, 1 master and 1 worker. It uses calico as cni, and everything looks to be working as expected (I'm able to deploy pods, services, etc). I'm able to reach ...
- 119
3
votes
1
answer
6k
views
curl & wget cannot resolve internal dns names within the aks cluster but nslookup , host , dig work fine
I have a managed kubernetes instance on azure. I am very sure that the core dns is working and the dns pods are healthy.
I have a couple of services
frontend-service with one pod - Image [nginx-...
- 51
0
votes
2
answers
1k
views
Resolving Kubernetes service via internal DNS server - Bare Metal
I have a kubernetes cluster running w/ 4 nodes, my main master node plus for other nodes. I used kubespray to get everything running. This is on my home network, which I will explain down bellow. ...
- 343
2
votes
1
answer
2k
views
No DNS resolution and Internet access from Kubernetes POD on Windows
I’ve built a cluster (v1.15.4) on hyper-v with
- linux node (master)
- linux node (worker)
- windows node (worker)
- networking - flannel (host-gw)
- mac spoofing enabled for vms
deployed win-...
- 321
0
votes
1
answer
1k
views
dns appending local domain to random queries
Aug 9 23:14:45 dnsmasq[11657]: reply registry-1.docker.io is 54.88.231.116
Aug 9 23:14:45 dnsmasq[11657]: reply registry-1.docker.io is 100.24.246.89
Aug 9 23:14:45 dnsmasq[11657]: reply ...
- 221
1
vote
2
answers
1k
views
Kubernetes kube-dns not resolving
I am noticing an unusual high latency when trying to resolve local and external DNS lookups inside Kubernetes. nslookup requests are sometimes resolved but take on average 40 seconds to complete.
...
0
votes
2
answers
860
views
Kubernetes service via OpenVPN
We have lot of access-points which are connecting to FreeRADIUS such way:
AP is connecting to OpenVPN service
via vpn it have access to freeradius server
Now we want to move our environment to ...
- 169
0
votes
1
answer
470
views
Container Engine/Kubernetes DNS to external
I want to let my containers on Google Container Engine point to a static IP outside of my Container Engine cluster (namely my db). Is it possible for me to prevent the use of an /etc/hosts file or a ...
- 101
3
votes
2
answers
1k
views
In a container cluster like Kubernetes or Docker 1.12 Swarm, how do you resolve with external DNS to the good container on the good host?
Maybe I am dumb, maybe am I just not using the good words, but I can't find even one answer anywhere on Stackexchange or the whole Web.
I have created lots of website, mostly with Wordpress, Drupal, ....
- 309
1
vote
2
answers
3k
views
Access service on subdomain in Kubernetes
I have following setup:
Private OpenStack Cloud - o̲n̲l̲y̲ Web UI (Horizon) is accessible
(API is restricted but maybe I could get access)
I have used CoreOS with a setup of ...
- 113
0
votes
2
answers
2k
views
How to provide Kubernetes api-server credentials to kube2sky inside a docker container in CoreOS
I've got a Kubernetes installation on CoreOS with DNS addon running in a pod.
My problem is this: kube2sky cannot access the api-server. By default it uses 127.0.0.1:8080 which is not available to ...
- 1,203