Kubeadm init

kubeadm init to bootstrap a Kubernetes control-plane node

• kubeadm init --pod-network-cidr=10.244.0.0/16
• kubeadm init --ignore-preflight-errors=All

With errors

 
 kubeadm init --pod-network-cidr=10.244.0.0/16
 W0419 17:17:35.020389   29884 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io 
 kubeproxy.config.k8s.io]
 [init] Using Kubernetes version: v1.18.2
 [preflight] Running pre-flight checks
 [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: docker is required for container runtime: exec: "docker": 
 executable file not found in $PATH
	[WARNING FileExisting-socat]: socat not found in system path
	[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
 error execution phase preflight: [preflight] Some fatal errors occurred:
	[ERROR NumCPU]: the number of available CPUs 1 is less than the required 2
	[ERROR FileExisting-crictl]: crictl not found in system path
	[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables does not exist
	[ERROR FileExisting-conntrack]: conntrack not found in system path
	[ERROR KubeletVersion]: couldn't get kubelet version: cannot execute 'kubelet --version': executable file not found in $PATH
 [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
 To see the stack trace of this error execute with --v=5 or higher

[ERROR NumCPU]: the number of available CPUs 1 is less than the required 2

• If using multipass: Multipass: Modify number of CPU on an existing instance

kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=All

With errors: docker not installed

kubeadm init

 W0823 18:18:03.055636   30827 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
 [init] Using Kubernetes version: v1.18.8
 [preflight] Running pre-flight checks
 [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: docker is required for 
 container runtime: exec: "docker": executable file not found in $PATH
 	[WARNING FileExisting-socat]: socat not found in system path 
	[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
 error execution phase preflight: [preflight] Some fatal errors occurred:
	[ERROR NumCPU]: the number of available CPUs 1 is less than the required 2
	[ERROR FileExisting-crictl]: crictl not found in system path
	[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables does 
 not exist
	[ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1
	[ERROR FileExisting-conntrack]: conntrack not found in system path
 [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
 To see the stack trace of this error execute with --v=5 or higher

Related terms

• conntrack (command) Netfilter (apt install conntract)
• socat: apt install socat
• kubeadm config images pull
• Kubernetes (snap install)

See also

• kubeadm [ init | token | config | reset | version | upgrade | join | --help ]
• Kubernetes: distributions, tools, CKA, CKS, Kubernetes interfaces: CSI, CNI, installation, workloads, networking, kubeadm, Kubernetes API, Kubernetes API Server, kubectl, kubeadm, kubelet, kube-proxy, Cloud services: EKS, GKE, TKE, DKS, Helm, Kubernetes RBAC, Kubernetes deployments, Minikube, Rancher, OpenShift, Charmed Kubernetes, Ingress, Kubernetes scheduler, Kubernetes Finalizers, logging, Kubernetes operator, Orka, kind:, Kubernetes namespaces, Kubernetes dashboard, Kubernetes Metrics Server, Field Selectors, CoreDNS, CRI, Kubernetes Topology Manager, Kubernetes governance: (SIG, KEP), Kustomize, controllers, ReadinessProbe, LivenessProbe, KOPS, K9s, Kui, k3s, ImagePullBackOff, PDB, EndPoints, Kots, metadata, Karpenter, Replicated.com, Kubernetes Authenticating, Kubernetes timeline, Changelog/Versions, service accounts, Kubernetes Pod Lifecycle, Kubernetes Conformance Certified, Kubernetes backup, Kubernetes Pod Security Admission, tEKS, Kubernetes events, Kubernetes ports, Kubernetes policies, Connect, addons, DoKC, Kubernetes control plane, Kubernetes Federation, Kubernetes info, Kubetest2, Sidecar (Kubernetes)