```

If your cluster was installed by kubeadm, you should edit the `featureGates` field in the `kubeadm-config` ConfigMap. You can do this using `kubectl -n kube-system edit cm kubeadm-config` before upgrading. For example:

kubeadm-config Before:

```
apiVersion: v1
kind: ConfigMap
metadata:
  name: kubeadm-config
data:
  MasterConfiguration: |
    kubeProxy:
      config:

* Trusty: Regional release .tar.gz support ([#23558](https://github.com/kubernetes/kubernetes/pull/23558), [@andyzheng0831](https://github.com/andyzheng0831))
* Make ConfigMap volume readable as non-root ([#23793](https://github.com/kubernetes/kubernetes/pull/23793), [@pmorie](https://github.com/pmorie))

  // +optional
  optional string apiGroup = 1;

  // Kind is the type of resource being referenced. This is the same
  // value as in the parameter object's metadata, for example "ConfigMap".
  optional string kind = 2;

  // Name is the name of resource being referenced.
  optional string name = 3;
}

// ResourceClaimSchedulingStatus contains information about one particular

[Service Discovery](#ServiceDiscovery) and [Config Store](#ConfigStore) were already discussed above, so do not need more explanation here.

#### Mesh Config

    runAsUser: 1000
    runAsGroup: 1000
  resources:
    requests:
      memory: 128Mi
  ## Additional volumes to add to the post-job.
  extraVolumes: []
    # - name: extra-policies
    #   configMap:
    #     name: my-extra-policies-cm
  ## Additional volumeMounts to add to the custom commands container when
  ## running the post-job.
  extraVolumeMounts: []
    # - name: extra-policies

  # otherwise pods stops trying to resolve the domain.
  if [ "${IP_FAMILY}" = "ipv6" ] || [ "${IP_FAMILY}" = "dual" ]; then
    # Get the current config
    original_coredns=$(kubectl get -oyaml -n=kube-system configmap/coredns)
    echo "Original CoreDNS config:"
    echo "${original_coredns}"
    # Patch it
    fixed_coredns=$(
      printf '%s' "${original_coredns}" | sed \

- Resolves spurious `Failed to list *v1.Secret` or `Failed to list *v1.ConfigMap` messages in kubelet logs. ([#99538](https://github.com/kubernetes/kubernetes/pull/99538), [@liggitt](https://github.com/liggitt)) [SIG Auth and Node]

data:
  excludel2.yaml: |
    announcedInterfacesToExclude: ["^docker.*", "^cbr.*", "^dummy.*", "^virbr.*", "^lxcbr.*", "^veth.*", "^lo$", "^cali.*", "^tunl.*", "^flannel.*", "^kube-ipvs.*", "^cni.*", "^nodelocaldns.*"]
kind: ConfigMap
metadata:
  name: metallb-excludel2
  namespace: metallb-system
---
apiVersion: v1
kind: Secret
metadata:
  name: webhook-server-cert
  namespace: metallb-system
---

    * `kubectl version` now supports `--output` ([#39858](https://github.com/kubernetes/kubernetes/pull/39858), [@alejandroEsc](https://github.com/alejandroEsc))

    * `kubectl create configmap` has a new option `--from-env-file` that populates a configmap from file which follows a key=val format for each line. ([#38882](https://github.com/kubernetes/kubernetes/pull/38882), [@fraenkel](https://github.com/fraenkel))

* Add IPv6 address support for pods - does NOT include services ([#23090](https://github.com/kubernetes/kubernetes/pull/23090), [@tgraf](https://github.com/tgraf))
* Use local disk for ConfigMap volume instead of tmpfs ([#25306](https://github.com/kubernetes/kubernetes/pull/25306), [@pmorie](https://github.com/pmorie))