Update cheatsheets

kubeadm

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# kubeadm
+
+> Command-line interface for creating and managing Kubernetes clusters.
+> More information: <https://kubernetes.io/docs/reference/setup-tools/kubeadm>.
+
+- Create a Kubernetes master node:
+
+`kubeadm init`
+
+- Bootstrap a Kubernetes worker node and join it to a cluster:
+
+`kubeadm join --token {{token}}`
+
+- Create a new bootstrap token with a TTL of 12 hours:
+
+`kubeadm token create --ttl {{12h0m0s}}`
+
+- Check if the Kubernetes cluster is upgradeable and which versions are available:
+
+`kubeadm upgrade plan`
+
+- Upgrade Kubernetes cluster to a specified version:
+
+`kubeadm upgrade apply {{version}}`
+
+- View the kubeadm ConfigMap containing the cluster's configuration:
+
+`kubeadm config view`
+
+- Revert changes made to the host by 'kubeadm init' or 'kubeadm join':
+
+`kubeadm reset`