- [Changelog since v1.21.4](#changelog-since-v1214)
  - [Important Security Information](#important-security-information)
    - [CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access](#cve-2021-25741-symlink-exchange-can-allow-host-filesystem-access)
  - [Changes by Kind](#changes-by-kind-8)
    - [Feature](#feature-6)
    - [Bug or Regression](#bug-or-regression-8)

func isHostIP(ipAddress string) bool {
	host, _, err := net.SplitHostPort(ipAddress)
	if err != nil {
		host = ipAddress
	}
	// Strip off IPv6 zone information.
	if i := strings.Index(host, "%"); i > -1 {
		host = host[:i]
	}
	return net.ParseIP(host) != nil
}

// extractHostPort - extracts host/port from many address formats

- Kubeadm: switch the preflight check (called 'Swap') that verifies if swap is enabled on Linux hosts to report a warning instead of an error. This is related to the graduation of the NodeSwap feature gate in the kubelet to Beta and being enabled by default in 1.23 - allows swap support on Linux hosts. In the next release of kubeadm (1.24) the preflight check will be removed, thus we recommend that you stop using it - e.g. via `--ignore-preflight-errors`...

- Service Controller: will now update load balancer hosts after node's `ProviderID` is
  updated. ([#120492](https://github.com/kubernetes/kubernetes/pull/120492), [@cezarygerard](https://github.com/cezarygerard))

- Images for cloud-controller-manager, kube-apiserver, kube-controller-manager, and kube-scheduler now contain a minimal /etc/nsswitch.conf and should respect /etc/hosts for lookups ([#69238](https://github.com/kubernetes/kubernetes/pull/69238), [@BenTheElder](https://github.com/BenTheElder))

### SIG Scheduling

        final Tuple3<String, String, String>[] vHosts = ComponentUtil.getFessConfig().getVirtualHosts();
        return LaRequestUtil.getOptionalRequest().map(req -> {
            for (final Tuple3<String, String, String> host : vHosts) {
                final String headerValue = req.getHeader(host.getValue1());
                if (host.getValue2().equalsIgnoreCase(headerValue)) {
                    return func.apply(host.getValue3());
                }

  // requirements.
  // +optional
  optional string nodeName = 10;

  // Host networking requested for this carp. Use the host's network namespace.
  // If this option is set, the ports that will be used must be specified.
  // Default to false.
  // +k8s:conversion-gen=false
  // +optional
  optional bool hostNetwork = 11;

  // Use the host's pid namespace.
  // Optional: Default to false.
  // +k8s:conversion-gen=false

    assertThat(parse("http:\\\\host/path"))
      .isEqualTo(parse("http://host/path"))
    assertThat(parse("http:///host/path"))
      .isEqualTo(parse("http://host/path"))
    assertThat(parse("http:\\//host/path"))
      .isEqualTo(parse("http://host/path"))
    assertThat(parse("http:/\\/host/path"))
      .isEqualTo(parse("http://host/path"))
    assertThat(parse("http://\\host/path"))

  and removed `--short` flag entirely. ([#116720](https://github.com/kubernetes/kubernetes/pull/116720), [@soltysh](https://github.com/soltysh))
- Kube-controller-manager deprecate `--volume-host-cidr-denylist` and `--volume-host-allow-local-loopback` flags. ([#118128](https://github.com/kubernetes/kubernetes/pull/118128), [@carlory](https://github.com/carlory)) [SIG API Machinery, Apps, Network, Node, Storage and Testing]

* Refactor addons into multiple packages ([#50214](https://github.com/kubernetes/kubernetes/pull/50214), [@andrewrynhard](https://github.com/andrewrynhard))
* Kubelet now manages `/etc/hosts` file for both hostNetwork Pods and non-hostNetwork Pods. ([#49140](https://github.com/kubernetes/kubernetes/pull/49140), [@rickypai](https://github.com/rickypai))