* Fix kubectl create secret/configmap to allow = values ([#24989](https://github.com/kubernetes/kubernetes/pull/24989), [@derekwaynecarr](https://github.com/derekwaynecarr))
* Upgrade installed packages when building hyperkube to improve the security profile ([#25114](https://github.com/kubernetes/kubernetes/pull/25114), [@aaronlevy](https://github.com/aaronlevy))

* Added a `kubeadm config images list` command that lists required container images for a kubeadm install. ([#63450](https://github.com/kubernetes/kubernetes/pull/63450), [@chuckha](https://github.com/chuckha))

it requires installation of the OpenStack Cinder CSI Driver. The in-tree AWS OpenStack Cinder driver "kubernetes.io/cinder" was deprecated in 1.16 and will be removed in 1.20. Users should enable CSIMigration + CSIMigrationOpenStack features and install the OpenStack Cinder CSI Driver (https://github.com/kubernetes/cloud-provider-openstack) to avoid disruption to existing Pod and PVC objects at that time. Users should start using the OpenStack Cinder CSI Driver directly for any new volumes. ([#8...

    /** The key of the message: {0} is not found. */
    public static final String ERRORS_plugin_file_is_not_found = "{errors.plugin_file_is_not_found}";

    /** The key of the message: Failed to install {0}. */
    public static final String ERRORS_failed_to_install_plugin = "{errors.failed_to_install_plugin}";

    /** The key of the message: Could not find available plugins. */

    server.useHttps(handshakeCertificates.sslSocketFactory())
    server.enqueue(MockResponse(body = "this response comes via HTTPS"))
    server.enqueue(MockResponse(body = "another response via HTTPS"))

    // install a custom SSL socket factory so the server can be authorized
    client =
      client
        .newBuilder()
        .sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),

  for actions against a CRI endpoint. The kubeadm deb/rpm packages will continue to install the `cri-tools`
  package for one more release, but in you must adapt your scripts to install `crictl` manually from
  https://github.com/kubernetes-sigs/cri-tools/releases or a different location.
  

- Changed the dependency version for CoreDNS. Kubernetes tools now install CoreDNS `v1.12.0`. ([#128926](https://github.com/kubernetes/kubernetes/pull/128926), [@bzsuni](https://github.com/bzsuni)) [SIG Cloud Provider and Cluster Lifecycle]

* Add SSH_OPTS to config ssh and scp port ([#28872](https://github.com/kubernetes/kubernetes/pull/28872), [@lojies](https://github.com/lojies))
* kube-up: install new Docker pre-requisite (libltdl7) when not in image ([#28745](https://github.com/kubernetes/kubernetes/pull/28745), [@justinsb](https://github.com/justinsb))

- `kube-proxy`: Added an option/flag for configuring the `nf_conntrack_tcp_be_liberal` sysctl (in the kernel's netfilter conntrack subsystem).  When enabled, `kube-proxy` will not install the `DROP` rule for invalid conntrack states, which currently breaks users of asymmetric routing. ([#120354](https://github.com/kubernetes/kubernetes/pull/120354), [@aroradaman](https://github.com/aroradaman))

### Feature

- The cluster addon for dashboard was removed. To install dashboard, see [here](https://github.com/kubernetes/dashboard/blob/master/docs/user/README.md). ([#107481](https://github.com/kubernetes/kubernetes/pull/107481), [@shu-mutou](https://github.com/shu-mutou))