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kubeadm upgrade

kubeadm upgrade is a user-friendly command that wraps complex upgrading logic behind one command, with support for both planning an upgrade and actually performing it. kubeadm upgrade can also be used for downgrading cluster if necessary.

kubeadm upgrade guidance

Every upgrade process might be a bit different, so we’ve documented each minor upgrade process individually. For more version-specific upgrade guidance, see the following resources:

For older versions, please refer to older documentation sets on the Kubernetes website.

In Kubernetes v1.11.0 and later, you can use kubeadm upgrade diff to see the changes that would be applied to static pod manifests.

To use kube-dns with upgrades in Kubernetes v1.13.0 and later please follow this guide.

In Kubernetes v1.15.0 and later, kubeadm upgrade apply and kubeadm upgrade node will also automatically renew the kubeadm managed certificates on this node, including those stored in kubeconfig files. To opt-out, it is possible to pass the flag --certificate-renewal=false. For more details about certificate renewal see the certificate management documentation.

kubeadm upgrade plan

Check which versions are available to upgrade to and validate whether your current cluster is upgradeable. To skip the internet check, pass in the optional [version] parameter

Synopsis

Check which versions are available to upgrade to and validate whether your current cluster is upgradeable. To skip the internet check, pass in the optional [version] parameter

kubeadm upgrade plan [version] [flags]

Options

      --allow-experimental-upgrades        Show unstable versions of Kubernetes as an upgrade alternative and allow upgrading to an alpha/beta/release candidate versions of Kubernetes.
      --allow-release-candidate-upgrades   Show release candidate versions of Kubernetes as an upgrade alternative and allow upgrading to a release candidate versions of Kubernetes.
      --config string                      Path to a kubeadm configuration file.
      --feature-gates string               A set of key=value pairs that describe feature gates for various features. No feature gates are available in this release.
  -h, --help                               help for plan
      --ignore-preflight-errors strings    A list of checks whose errors will be shown as warnings. Example: 'IsPrivilegedUser,Swap'. Value 'all' ignores errors from all checks.
      --kubeconfig string                  The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file. (default "/etc/kubernetes/admin.conf")
      --print-config                       Specifies whether the configuration file that will be used in the upgrade should be printed or not.

Options inherited from parent commands

      --rootfs string   [EXPERIMENTAL] The path to the 'real' host root filesystem.

kubeadm upgrade apply

Upgrade your Kubernetes cluster to the specified version

Synopsis

Upgrade your Kubernetes cluster to the specified version

kubeadm upgrade apply [version]

Options

      --allow-experimental-upgrades        Show unstable versions of Kubernetes as an upgrade alternative and allow upgrading to an alpha/beta/release candidate versions of Kubernetes.
      --allow-release-candidate-upgrades   Show release candidate versions of Kubernetes as an upgrade alternative and allow upgrading to a release candidate versions of Kubernetes.
      --certificate-renewal                Perform the renewal of certificates used by component changed during upgrades. (default true)
      --config string                      Path to a kubeadm configuration file.
      --dry-run                            Do not change any state, just output what actions would be performed.
      --etcd-upgrade                       Perform the upgrade of etcd. (default true)
      --feature-gates string               A set of key=value pairs that describe feature gates for various features. No feature gates are available in this release.
  -f, --force                              Force upgrading although some requirements might not be met. This also implies non-interactive mode.
  -h, --help                               help for apply
      --ignore-preflight-errors strings    A list of checks whose errors will be shown as warnings. Example: 'IsPrivilegedUser,Swap'. Value 'all' ignores errors from all checks.
      --image-pull-timeout duration        The maximum amount of time to wait for the control plane pods to be downloaded. (default 15m0s)
      --kubeconfig string                  The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file. (default "/etc/kubernetes/admin.conf")
      --print-config                       Specifies whether the configuration file that will be used in the upgrade should be printed or not.
  -y, --yes                                Perform the upgrade and do not prompt for confirmation (non-interactive mode).

Options inherited from parent commands

      --rootfs string   [EXPERIMENTAL] The path to the 'real' host root filesystem.

kubeadm upgrade diff

Show what differences would be applied to existing static pod manifests. See also: kubeadm upgrade apply –dry-run

Synopsis

Show what differences would be applied to existing static pod manifests. See also: kubeadm upgrade apply –dry-run

kubeadm upgrade diff [version] [flags]

Options

      --api-server-manifest string           path to API server manifest (default "/etc/kubernetes/manifests/kube-apiserver.yaml")
      --config string                        Path to a kubeadm configuration file.
  -c, --context-lines int                    How many lines of context in the diff (default 3)
      --controller-manager-manifest string   path to controller manifest (default "/etc/kubernetes/manifests/kube-controller-manager.yaml")
  -h, --help                                 help for diff
      --scheduler-manifest string            path to scheduler manifest (default "/etc/kubernetes/manifests/kube-scheduler.yaml")

Options inherited from parent commands

      --rootfs string   [EXPERIMENTAL] The path to the 'real' host root filesystem.

kubeadm upgrade node

Upgrade commands for a node in the cluster

Synopsis

Upgrade commands for a node in the cluster

The “node” command executes the following phases:

control-plane   Upgrade the control plane instance deployed on this node, if any
kubelet-config  Upgrade the kubelet configuration for this node

kubeadm upgrade node [flags]

Options

      --dry-run                  Do not change any state, just output the actions that would be performed.
  -h, --help                     help for node
      --kubeconfig string        The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file. (default "/etc/kubernetes/admin.conf")
      --kubelet-version string   The *desired* version for the kubelet config after the upgrade. If not specified, the KubernetesVersion from the kubeadm-config ConfigMap will be used
      --skip-phases strings      List of phases to be skipped

Options inherited from parent commands

      --rootfs string   [EXPERIMENTAL] The path to the 'real' host root filesystem.

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