Difference between revisions of "Kubeadm init"

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<code>[[kubeadm init]] --[[pod]]-network-cidr=10.244.0.0/16</code>
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{{lowercase}}
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<code>[[kubeadm]] init</code> to bootstrap a Kubernetes [[control-plane]] node
  
  
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* <code>[[kubeadm]] init --[[pod-network-cidr]]=10.244.0.0/16</code>
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* <code>[[kubeadm init --ignore-preflight-errors=All]]</code>
  
 +
Dependencies:
 +
* <code>[[kubeadm config images pull]]</code>
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* <code>[[apt install socat]] [[conntrack]]</code>
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* <code>[[snap install kubectl --classic]]</code>
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* <code>[[snap install kubelet --classic]] && [[snap start kubelet.daemon]]</code>
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* [[Ubuntu crictl installation|crictl-tools]]
 +
 +
== [[Play-with-K8s]] ==
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* <code>[[kubeadm init --apiserver-advertise-address $(hostname -i) --pod-network-cidr 10.5.0.0/16]]</code>
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* <code>[[kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml]]</code>
 +
 +
== With errors ==
 +
 +
kubeadm init --pod-network-cidr=10.244.0.0/16
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W0419 17:17:35.020389  29884 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io
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kubeproxy.config.k8s.io]
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[init] Using Kubernetes version: v1.18.2
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[preflight] Running pre-flight checks
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[preflight] WARNING: Couldn't create the interface used for talking to the container runtime: docker is required for container runtime: exec: "docker":
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executable file not found in $PATH
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[WARNING FileExisting-socat]: socat not found in system path
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[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
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  error execution phase preflight: [preflight] Some fatal errors occurred:
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[ERROR NumCPU]: the number of available CPUs 1 is less than the required 2
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[ERROR FileExisting-crictl]: [[crictl]] not found in system path
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[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables does not exist
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[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
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  [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 ===
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* If using <code>[[multipass]]</code>: [[Multipass: Modify number of CPU on an existing instance]]
 +
 +
 +
kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=All
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 +
== With errors: [[docker]] not installed ==
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kubeadm init
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<pre>
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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
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not exist
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[ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1
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[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
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</pre>
 +
 +
 +
== [[v1.25]].4 ==
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[init] Using Kubernetes version: v1.25.4
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[preflight] Running pre-flight checks
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W1203 13:22:13.289185  159684 checks.go:1019] [preflight] WARNING: Couldn't create the interface used for talking to the container
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runtime: [[crictl]] is required by the container runtime: executable file not found in $PATH
 +
[WARNING SystemVerification]: missing optional [[cgroups]]: [[blkio]]
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[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
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error execution phase preflight: [preflight] Some fatal errors occurred:
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[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-crictl]: crictl 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
 +
 +
== Related terms ==
 +
* <code>[[conntrack]] (command)</code> [[Netfilter]] (<code>[[apt install conntrack]]</code>)
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* <code>[[socat]]</code>: <code>[[apt install]] [[socat]]</code>
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* <code>[[kubeadm config images pull]]</code>
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* [[Kubernetes (snap install)]]
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* <code>[[kubeadm join]]</code>
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* <code>[[kind: ClusterConfiguration]]</code>
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* <code>[[snap install kubelet --classic]]</code>
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* <code>[[/etc/kubernetes/manifests/]]</code>
  
 
== See also ==
 
== See also ==
 +
* {{kubeadm init}}
 
* {{kubeadm}}
 
* {{kubeadm}}
−
* {{K8s}}
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* {{Kubernetes installation}}
  
  
 
[[Category:Kubernetes]]
 
[[Category:Kubernetes]]

Latest revision as of 10:43, 20 March 2024

kubeadm init to bootstrap a Kubernetes control-plane node


Dependencies:

Play-with-K8s[edit]

With errors[edit]

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[edit]


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

With errors: docker not installed[edit]

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


v1.25.4[edit]

[init] Using Kubernetes version: v1.25.4
[preflight] Running pre-flight checks
W1203 13:22:13.289185  159684 checks.go:1019] [preflight] WARNING: Couldn't create the interface used for talking to the container 
runtime: crictl is required by the container runtime: executable file not found in $PATH 
	[WARNING SystemVerification]: missing optional cgroups: blkio
	[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
error execution phase preflight: [preflight] Some fatal errors occurred:
	[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-crictl]: crictl 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

Related terms[edit]

See also[edit]

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