Highest scored 'kubernetes' questions

262 votes

5 answers

317k views

Kubernetes stuck on ContainerCreating

A pod in my Kubernetes cluster is stuck on "ContainerCreating" after running a create. How do I see logs for this operation in order to diagnose why it is stuck? kubectl logs doesn't seem to work ...

four43

2,875

asked Oct 13, 2015 at 20:40

124 votes

8 answers

155k views

Is it possible to rerun kubernetes job?

I have the following Kubernetes Job configuration: --- apiVersion: batch/v1 kind: Job metadata: name: dbload creationTimestamp: spec: template: metadata: name: dbload spec: ...

Bostone

1,373

asked Oct 17, 2016 at 23:35

75 votes

4 answers

68k views

Why disable swap on kubernetes

Since Kubernetes 1.8, it seems I need to disable swap on my nodes (or set --fail-swap-on to false). I cannot find the technical reason why Kubernetes insists on the swap being disabled. Is this for ...

Jeroen Jacobs

1,406

asked Nov 2, 2017 at 13:22

68 votes

5 answers

127k views

How do I tell when/if/why a container in a kubernetes cluster restarts?

I have a single node kubernetes cluster in google container engine to play around with. Twice now, a small personal website I host in it has gone offline for a couple minutes. When I view the logs ...

Marc Hughes

845

asked Oct 6, 2015 at 15:43

38 votes

6 answers

58k views

How to increase disk size in a stateful set

I'm managing an Elasticsearch deployment in Kubernetes. I see that the disk storage is getting close to full, so I would like to increase the size of the persistent volumes. I want to change this ...

Brent Bradburn

481

asked Feb 22, 2019 at 14:26

37 votes

16 answers

172k views

kubectl get nodes error: You must be logged in to the server (Unauthorized) - how to fix

Without changes in infrastructure If I execute any kubectl command, ie: kubectl get nodes I get the error You must be logged in to the server (Unauthorized) The kubernetes cluster was opperating ok ...

Wojtas.Zet

491

asked Sep 2, 2020 at 7:07

33 votes

7 answers

35k views

rsync files to a kubernetes pod

I need to rsync a file tree to a specific pod in a kubernetes cluster. It seems it should be possible if only one can convince rsync that kubectl acts sort of like rsh. Something like: rsync --rsh='...

Bittrance

3,130

asked Dec 8, 2015 at 19:17

32 votes

8 answers

103k views

Kubernetes always gives 503 Service Temporarily Unavailable with multiple TLS Ingress

I have a kubernetes cluster setup by kops on Amazon Web Services I have a 2 sites setup. One is secured via SSL/TLS/https and the other is just http. Both are Wordpress sites. Domains changed to ...

Greg Pagendam-Turner

1,033

asked Aug 12, 2017 at 2:24

32 votes

2 answers

19k views

What is spec - selector - matchLabels used for while creating a deployment?

From Kubernetes documentation: The selector field defines how the Deployment finds which Pods to manage. But, when creating deployment, I already specify the pod template as part of the ...

Paddy

475

asked Jun 19, 2018 at 18:45

30 votes

3 answers

96k views

How to mount volume with specific UID in Kubernetes Pod?

So, I'm trying to get Nexus running based off of this image in Kubernetes, but it's failing with: mkdir: cannot create directory '../sonatype-work/nexus3/log': Permission denied mkdir: cannot create ...

srkiNZ84

581

asked Apr 5, 2018 at 3:50

28 votes

5 answers

9k views

Expose port 80 and 443 on Google Container Engine without load balancer

Currently I'm working on a small hobby project which I'll make open source once it's ready. This service is running on Google Container Engine. I chose GCE to avoid configuration hassle, the costs are ...

Ruben Ernst

383

asked Sep 5, 2016 at 18:26

25 votes

5 answers

19k views

Is microk8s suitable for production environments, or is it just for development?

microk8s appears to be an easy way to install Kubernetes on Ubuntu. Several places refer to it as an alternative to minikube, which is not aimed at production environments, and this post seems to ...

Travis

385

asked Nov 27, 2018 at 16:54

24 votes

3 answers

88k views

How could I find the Kubernetes Pod restart reasons

In have scaled my Pods to 20 in my cluster and when I see the next day the few of the scaled Pods were recreated. When I say Pod recreated, it is getting deleted and created freshly and the timestamp ...

Nikhil

301

asked May 16, 2021 at 12:02

23 votes

4 answers

34k views

Using environment variables in Kubernetes deployment spec

I currently use a Kubernetes spec Deployment.yaml for deploying a service. The spec includes a verbatim reference to a specific IP address (marked as <static-ip-address> below): spec: type: ...

Drux

706

asked Jul 25, 2016 at 2:42

23 votes

4 answers

30k views

kubernetes dns resolver in nginx

I was developing locally in docker-compose, and had an nginx container doing a simple proxy_pass like so: location /app/ { proxy_pass http://webapp:3000/; proxy_http_version 1.1; ...

sharif9876

331

asked Sep 30, 2017 at 20:28

20 votes

10 answers

44k views

failed to run Kubelet: validate service connection: CRI v1 runtime API is not implemented for endpoint

I have installed kubelet 1.26.0 on Ubuntu 22.04 using apt install kubelet command, but when I try journalctl -xeu kubelet I get the following result: ░░ ░░ The unit kubelet.service has entered the '...

best_of_man

427

asked Dec 14, 2022 at 23:46

19 votes

1 answer

91k views

Back-off restarting failed container - Error syncing pod in Minikube

I'm facing this error when trying to create pods. It is occurring with even very common images like Ubuntu,Alpine also. I'm fairly new to Kubernetes and using a Minikube Node ( version v0.24.1 ) ...

Ram Krishnan

191

asked Jul 31, 2018 at 9:48

19 votes

5 answers

83k views

How do i view logs for my Kubernetes Ingress Controller?

I have recently started to learn about Kubernetes and i'm trying understand why my ingress controller is giving a 502 error. i'm working with google cloud platform. i can see my service of type: ...

X0r0N

305

asked Jul 15, 2017 at 10:38

18 votes

3 answers

24k views

How to choose the external IP address of a Kubernetes load balancer in Google Kubernetes Engine

I'm deploying a web app using Google Kubernetes Engine and I want to make it accessible via a load balancer on an existing static IP address that I control as part of the same project in Google Cloud ...

Ben

283

asked Jul 14, 2015 at 11:48

17 votes

5 answers

57k views

How to find the service principal assigned to a newly created AKS cluster?

I have just created an AKS cluster using a standard az aks create ... --ssh-key-value .... According to https://docs.microsoft.com/en-us/azure/aks/kubernetes-service-principal, an AKS cluster is ...

JoaoCC

305

asked Feb 10, 2018 at 21:41

15 votes

3 answers

49k views

Kubernetes nginx ingress: How to redirect foo.example.org to example.org?

My ingress currently looks like this: apiVersion: networking.k8s.io/v1beta1 kind: Ingress metadata: name: ingress annotations: kubernetes.io/ingress.class: nginx cert-manager.io/cluster-...

mpen

463

asked Aug 2, 2020 at 20:09

15 votes

6 answers

19k views

How to list all containers in Kubernetes?

How do i list all containers in Kubernetes cluster using kubectl? Current documentation doesn't mention anything like 'container' resource. kubectl get pod -o json lists all pods which contains ...

czerny

265

asked Sep 13, 2017 at 16:10

15 votes

2 answers

50k views

How to rewrite url to backend while preserving browser url in nginx ingress?

I'm trying to rewrite the path to the service while preserving the browser url with nginx ingress on kubernetes. What I need is this: http://example.com/path => http://service http://example.com/...

Natan

253

asked May 15, 2020 at 20:31

14 votes

4 answers

7k views

Error creating GCE load balancer: requested address ip is neither static nor assigned to LB

I have a situation where Kubernetes apparently can no longer assign an external IP address to a service upon kubectl create -f Deployment.yaml. kubectl describe service <my-service> reports the ...

Drux

706

asked Aug 15, 2016 at 12:29

14 votes

1 answer

7k views

Kubernetes v1.24.3 upgrade broke ingress-nginx

After upgrading our AKS kubernetes cluster to from v1.23.8 to v1.24.3 our ingress stopped working properly. No errors logged in events and the ingress-nginx pod does not report any errors on the ...

sevenam

441

asked Sep 8, 2022 at 18:35

14 votes

2 answers

4k views

Kubernetes - can I avoid using the GCE Load Balancer to reduce cost?

I'm deploying a Kubernetes cluster on GCE using Gitlab-CI. I'd like to keep the cost to a minimum - here's my current setup: Nodes run on 3 f1-micro instances A system pod running Traefik configured ...

Mitkins

255

asked Jul 22, 2017 at 0:01

14 votes

1 answer

5k views

Enable VPC-native (alias IP) on an existing GKE cluster

Is there a way to enable Alias IP on existing GKE cluster (with disabled Alias IP)? (Besides using https://github.com/bowei/k8s-custom-iptables to create NATs on each node)

vtemian

181

asked Aug 21, 2018 at 15:15

13 votes

1 answer

2k views

Graceful shutdown of Kubernetes cluster

We have a 4 node Kubernetes cluster, installed using Juju 2.0 and the official canonical Kubernetes charm. The sole purpose of this very local and private installation is development and testing. One ...

Kamil Tamiola

131

asked Nov 14, 2016 at 21:48

12 votes

4 answers

33k views

How do I check the max pod capacity of a Kubernetes node

I am busy setting up new k8s cluster. I am using rke with the --max-pods: 200 kubelet: # https://rancher.com/docs/rke/latest/en/config-options/services/services-extras/#extra-args extra_args: ...

nelaaro

654

asked Feb 24, 2020 at 6:54

12 votes

3 answers

5k views

HorizontalPodAutoscaling on Amazon EKS

When trying to setup a HorizontalPodAutoscaler on Amazon EKS, the TARGETS column always displays <unknown>/50% and when describing the HPA, I see Warning FailedGetResourceMetric 17s (x50 ...

James Mills

223

asked Jun 22, 2018 at 18:33

11 votes

2 answers

36k views

Can host aliases be assigned to deployments in Kubernetes? If so, how?

This article describes how to assign host aliases to pods in kubernetes, is there anyway to do it for a deployment and not for a pod as such? Any other suggestions to add host entries in kubernetes ...

Ulukai

919

asked Jan 31, 2018 at 23:32

11 votes

2 answers

18k views

Is there a regex function for kubernetes helm templates available?

I'm trying to implement an ingress helm template encoding the current application version into the url. This shall allow users to do soft migration by providing them different versions of the ...

Oliver Probst

133

asked Jul 14, 2017 at 6:43

11 votes

1 answer

8k views

minikube/k8s/kubectl "failed to watch file [ ... ]: no space left on device"

I'm fairly new to k8s and minikube, and could use help understanding the frequent-but-not-ubiquitous error I get when running kubectl logs -f <POD NAME> I get this, sometimes, and ...

Ben

251

asked Apr 17, 2019 at 18:34

11 votes

1 answer

6k views

Can a Kubernetes pod span nodes?

The Docs say... A pod (as in a pod of whales or pea pod) is a group of one or more containers (such as Docker containers), the shared storage for those containers, and options about how to run the ...

Bruno Bronosky

4,539

asked Oct 19, 2016 at 14:26

11 votes

3 answers

36k views

How do I give a docker container its own routable IP on the original network?

Main question Imagine this scenario. A network of 192.168.0.0/24. A computer with hostname 'Docker-Host' is running a docker engine at 192.168.0.2 'Docker-Host' has sshd server running On 'Docker-...

TrevorKS

263

asked Mar 15, 2019 at 1:39

10 votes

2 answers

28k views

Kubernetes pod /etc/resolv.conf has the wrong nameserver

I have a 4-node cluster setup at home that I am playing with, and ran into a problem when I started trying to do pod-to-pod communications. I used Kubespray to install the nodes (1 "server/controller"...

CodeChimp

343

asked Mar 29, 2020 at 3:38

9 votes

4 answers

8k views

kube-proxy won't start in Minikube because of permission denied issue with /proc/sys/net/netfilter/nf_conntrack_max

After updating Arch Linux (sudo pacman -Syu) and restarting the system, Minikube fails to start because of kube-proxy. The logs show it was trying to modify /proc/sys/net/netfilter/nf_conntrack_max ...

RedGiant

211

asked May 11, 2021 at 5:25

9 votes

5 answers

30k views

kubectl cannot authenticate with AWS EKS

I cannot get kubectl to authenticate with the EKS Kubernetes instance my coworker created. I've followed the documentation: the AWS CLI can run aws eks commands (I'm an AWS Full Administrator), and ...

spiffytech

1,123

asked Jun 10, 2018 at 23:47

9 votes

2 answers

18k views

Kubernetes: relation between Service IP's and pod IP's

I'm trying to understand a bit more about Kubernetes networking. That's why I've deployed a cluster in google cloud and checked the networking: gcloud container clusters describe cluster0 | grep -i ...

DenCowboy

343

asked Apr 27, 2018 at 17:02

9 votes

1 answer

3k views

NGINX vs. GCE Kubernetes ingress classes

When setting up a Kubernetes ingress on Google Container Engine, you can choose the ingress class (gce or nginx). I realize that the GCE class provisions a load balancer on Google's Cloud Platform, ...

Wes Cossick

333

asked Oct 6, 2017 at 17:21

9 votes

1 answer

17k views

Amazon EKS: how to configure S3 access for worker nodes?

How can I configure an EKS cluster to automatically allow S3 access from worker nodes? I've set up an EKS cluster following the Getting Started guide and have run the example Guest Book app. Now I ...

jackkamm

251

asked Sep 21, 2018 at 20:01

9 votes

1 answer

9k views

Detecting Kubernetes OOMKilled Events in GKE Logs

I'd like to set up instrumentation for OOMKilled events, which look like this when examining a pod: Name: pnovotnak-manhole-123456789-82l2h Namespace: test Node: test-cluster-cja8smaK-oQSR/10.x....

pnovotnak

260

asked Feb 3, 2017 at 23:20

9 votes

1 answer

14k views

How to find out PID of the container using crictl

Kubernetes is deprecating Docker as CRI engine. Now there is containerd and CRI-O, which can be used as an alternative to it. Both can be managed via crictl from cri-tools. I need some common way to ...

kvaps

263

asked Feb 26, 2021 at 8:18

9 votes

1 answer

1k views

Tailing logs with GCE and stackdriver

I have a running Kubernetes cluster that aggregates it's logfiles in stackdriver and would like to tail the aggregated logs on the command line. But so far I am only able to view the json stream float ...

keyboardsamurai

271

asked Jun 22, 2017 at 17:20

8 votes

1 answer

8k views

Worker Group VS Node Group EKS

I am trying to use https://registry.terraform.io/modules/terraform-aws-modules/eks/aws/12.2.0(Terraform AWS EKS provider) What is the difference between worker nodes and node group?

Alex Kok

83

asked Sep 8, 2020 at 19:41

8 votes

2 answers

23k views

Pod keeps restarting and is in a CrashLoopBackOff state

One of our pods won't start and is constantly restarting and is in a CrashLoopBackOff state: NAME READY STATUS RESTARTS AGE ...

Dexter J.

93

asked Jan 28, 2016 at 0:38

8 votes

1 answer

17k views

Kubernetes deployment "failed to pull image" with local registry, minikube

I'm getting a "Failed to pull image" error on my deployment in minikube with a local registry, despite other deployments using the same image registry working as expected. My workflow is to build ...

Ben

251

asked Apr 23, 2019 at 20:33

8 votes

3 answers

12k views

Kubernetes - how to map docker run command-line parameters to kubectl command line

I need to run this Docker command in Kubernetes: docker run -p 8080:8080 sagemath/sagemath sage -notebook I can map everything across except "-notebook" - does anyone know how to do that? Here is ...

A X

529

asked Jan 17, 2018 at 1:07

8 votes

1 answer

8k views

What is the difference between objects project and namespace in Openshift 4.x

In openshift 4.x, you have an API for project which seems to be totally similar to namespace in the sense that when you create a project there a namespace created and the other way around. I know ...

Baptiste Mille-Mathias

728

asked Jul 17, 2020 at 13:36

8 votes

2 answers

13k views

How to setup Mosquitto MQTT Broker in Kubernetes

I have been trying to set up ChirpStack in a Kubernetes space, but it doesn't seem to be working for me, and I can't find any resources online that have been the solution. **chirpstack-application-...

J M Smith

81

asked Dec 10, 2020 at 15:10

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