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Questions tagged [kubeadm]

89 questions
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4 answers

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: - max-pods: 200 #…
nelaaro
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4
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1 answer

Kubernetes: Pod IP address is out of range specified in --pod-network-cidr

After upgrading to v1.24.0 (after Dockershim removal), I had to install cri-dockerd, then I did the following: sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --cri-socket=unix:///var/run/cri-dockerd.sock…
TheDHM
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3
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2 answers

What is the proper way to modify kubelet and control-plane configuration with kubeadm?

I've installed a kubernetes (v1.20.0) cluster with 3 masters and 3 nodes using kubeadm init and kubeadm join, all on Ubuntu 20.04. Now I need to update the configuration and Add --cloud-provider=external kubelet startup flag on all nodes as I'm…
Diddi Oskarsson
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2
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2 answers

Kubeadm 1.24 with containerd. Kubeadm init fail (centos 7)

I try to install a single node cluster on centos 7, with kubadm 1.24 and with containerd, i followed the installation steps, and i did: containerd config default > /etc/containerd/config.toml and passed : SystemdCgroup = true but the kubeadm init…
awot83
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2
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2 answers

How do I configure Kubernetes to use kubenet with kubeadm?

I deployed a Kubernetes cluster using kubeadm. $ kubectl get nodes NAME STATUS ROLES AGE VERSION ip-172-31-33-9.us-east-2.compute.internal NotReady 48m …
timkay
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2
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1 answer

Kubernets 1.21.3 The recommended value for "clusterCIDR" in "KubeProxyConfiguration"

I am trying to join new node to existing v1.21.3 cluster with Calico CNI. join command giving clusterCIDR warning. How to fix this subnet warning message? # kubeadm join master-vip:8443 --token xxx --discovery-token-ca-cert-hash…
sfgroups
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3 answers

How can I find which kubernetes certificate has expired?

I have a kubeadm installed kubernetes cluster. Recently it stopped working. kubelet is running but seems stuck in initialization phases. I think the root cause is this recurring log in kube-apiserver: 1 authentication.go:63] "Unable to authenticate…
Antoine
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2
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1 answer

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.k8s.io/v1beta2 kind:…
huang06
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2
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1 answer

coredns pods stuck in Pending state

I'm trying to learn k8s and since I happen to have access to OpenStack cloud I figured I'll try to install k8s on it, following this wiki. So far I was able to initialize cluster, install weave CNI, connected an external worker and install…
Bartek Gmerek
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1 answer

Which certificate does kubelet use?

This is a kubeadm based 1.16 cluster. The way I understand mTLS work between an apiserver & kubelet is: apiserver -> kubelet --kubelet-client-certificate & --kubelet-client-key => The certs & key given here(apiserver) is for apiserver(client) to…
swetad90
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2
votes
1 answer

Warnings in kubeadm after migrating from docker to containerd

I run a kubernetes cluster, installed with kubeadm. I recently upgraded from 1.19 to 1.20 and migrated the container runtime from docker to containerd, since docker is now deprecated. I configured containerd and kubelet to use it, and uninstalled…
Antoine
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2
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1 answer

Kube-apiserver crashing

I am trying to create a kubernetes cluster on my local machine. I created 3 vm's (two master and a slave). I am using kubespray(v2.15.0) to create my cluster, But my kube-apiserver contianer keeps crashing with following…
Vishak Vinod
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2
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1 answer

Update apiserver certificates for HA k8s cluster

I have HA k8s cluster that was created by kubeadm. I would like to update API server certificate to add additional SANs. For this purpose I followed some steps described in another post, but what I did for HA cluster: Removed API server…
Anatoli
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2
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1 answer

AWS Cloud Provider Integration with Kubernetes - Nodes stuck with "uninitialized: true" taint after bootstrapping

Summary I am attempting to bootstrap a Kubernetes cluster on AWS using Kubeadm. Please before you suggest them, I am not interested in using EKS or another bootstrapping solution like Kops, Kubespray, etc. It appears that there is a lot of…
TJ Zimmerman
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1
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1 answer

kube-apiserver high much ram usage

I have a Kubernetes cluster with 4 nodes and around 100 pods and kube-apiserver start with flag --target-ram-mb=512 kube-apiserver consumes ~3GB of RAM and it is growing (pprof) top Showing nodes accounting for 1.42GB, 82.29% of 1.73GB…
user2265148
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