- Added support to the kube-proxy nodePortAddresses / --nodeport-addresses option to
  accept the value "primary", meaning to only listen for NodePort connections
  on the node's primary IPv4 and/or IPv6 address (according to the Node object).
  This is strongly recommended, if you were not previously using
  --nodeport-addresses, to avoid surprising behavior.

* Allow kube- and cloud-controller-manager to listen on ports up to 65535. ([#65860](https://github.com/kubernetes/kubernetes/pull/65860), [@sttts](https://github.com/sttts))
* Allow kube-scheduler to listen on ports up to 65535. ([#65833](https://github.com/kubernetes/kubernetes/pull/65833), [@sttts](https://github.com/sttts))

- Add --permit-address-sharing flag to `kube-apiserver` to listen with `SO_REUSEADDR`. While allowing to listen on wildcard IPs like 0.0.0.0 and specific IPs in parallel, it avoids waiting for the kernel to release socket in `TIME_WAIT` state, and hence, considerably reducing `kube-apiserver` restart times under certain conditions. (...

pkg syscall (freebsd-386-cgo), func Kill(int, Signal) error
pkg syscall (freebsd-386-cgo), func Kqueue() (int, error)
pkg syscall (freebsd-386-cgo), func Listen(int, int) error
pkg syscall (freebsd-386-cgo), func Lstat(string, *Stat_t) error
pkg syscall (freebsd-386-cgo), func Mkfifo(string, uint32) error
pkg syscall (freebsd-386-cgo), func Mknod(string, uint32, int) error

- This PR sets the --cluster-dns flag value to kube-dns service IP whether or not NodeLocal DNSCache is enabled. NodeLocal DNSCache will listen on both the link-local as well as the service IP. ([#84383](https://github.com/kubernetes/kubernetes/pull/84383), [@prameshj](https://github.com/prameshj))
- kube-dns add-on:

pkg crypto/tls, const VerifyClientCertIfGiven ClientAuthType
pkg crypto/tls, func Client(net.Conn, *Config) *Conn
pkg crypto/tls, func Dial(string, string, *Config) (*Conn, error)
pkg crypto/tls, func Listen(string, string, *Config) (net.Listener, error)
pkg crypto/tls, func LoadX509KeyPair(string, string) (Certificate, error)
pkg crypto/tls, func NewListener(net.Listener, *Config) net.Listener

* Implement alpha version of PreferAvoidPods ([#20699](https://github.com/kubernetes/kubernetes/pull/20699), [@jiangyaoguo](https://github.com/jiangyaoguo))
* Retry when apiserver fails to listen on insecure port ([#28797](https://github.com/kubernetes/kubernetes/pull/28797), [@aaronlevy](https://github.com/aaronlevy))

cluster-internal resources installed by kubeadm will be overwritten when upgrading from v1.6 to v1.7. ([#47081](https://github.com/kubernetes/kubernetes/pull/47081), [@luxas](https://github.com/luxas))

* kubeadm deb/rpm packages: cAdvisor doesn't listen on `0.0.0.0:4194` without authentication/authorization because of the possible information leakage. The cAdvisor API can still be accessed via `https://{node-ip}:10250/stats/`, though. ([kubernetes/release#356](https://github.com/kubernetes/release/pull/356),...

                        unique across all servers.
                      type: string
                    port:
                      description: The Port on which the proxy should listen for incoming
                        connections.
                      properties:
                        name:
                          description: Label assigned to the port.

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