### TLS with SNI Extension { #tls-with-sni-extension }

**Only one process** in the server can be listening on a specific **port** in a specific **IP address**. There could be other processes listening on other ports in the same IP address, but only one for each combination of IP address and port.

TLS (HTTPS) uses the specific port `443` by default. So that's the port we would need.

		// Range can only be numeric.
		{":9000", []string{"/export1{a...z}"}, false},
		// Duplicate disks not allowed.
		{":9000", []string{"/export1{1...32}", "/export1{1...32}"}, false},
		// Same host cannot export same disk on two ports - special case localhost.
		{":9001", []string{"http://localhost:900{1...2}/export{1...64}"}, false},
		// Valid inputs.
		{":9000", []string{"/export1"}, true},

* support for mounting local-ssds on GCI ([#27143](https://github.com/kubernetes/kubernetes/pull/27143), [@adityakali](https://github.com/adityakali))
* AWS: support mixed plaintext/encrypted ports in ELBs via service.beta.kubernetes.io/aws-load-balancer-ssl-ports annotation ([#26976](https://github.com/kubernetes/kubernetes/pull/26976), [@therc](https://github.com/therc))

 * Side Public License, v 1.
 */

package org.elasticsearch.gradle.internal;

import org.elasticsearch.gradle.internal.util.ports.AvailablePortAllocator;
import org.elasticsearch.gradle.internal.util.ports.ReservedPortRange;
import org.gradle.api.Plugin;
import org.gradle.api.Project;

public class InternalAvailableTcpPortProviderPlugin implements Plugin<Project> {

    @Override

### 多個行程 - Workers { #multiple-processes-workers }

如果你的客戶端比單一行程所能處理的更多（例如虛擬機規格不大），而伺服器 CPU 有「多核心」，那你可以同時執行「多個行程」載入相同的應用，並把所有請求分散給它們。

當你執行同一個 API 程式的「多個行程」時，通常稱為「workers（工作行程）」。

### 工作行程與連接埠 { #worker-processes-and-ports }

還記得文件中[關於 HTTPS](https.md) 的說明嗎：在一台伺服器上，一組 IP 與連接埠的組合只能由「一個行程」監聽？

這裡同樣適用。

因此，若要同時擁有「多個行程」，就必須有「單一行程」在該連接埠上監聽，然後以某種方式把通信傳遞給各個工作行程。

### 每個行程的記憶體 { #memory-per-process }

 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.gradle.internal.util.ports;

public interface PortDetector {
    boolean isAvailable(int port);

 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.gradle.internal.util.ports;

import org.gradle.internal.Pair;

import java.util.ArrayList;
import java.util.List;

public class AvailablePortAllocator {
    public static final int MIN_PRIVATE_PORT = 10300;

- kube- and cloud-controller-manager can now listen on ports up to 65535 rather than 32768, solving problems with operating systems that request these higher ports.. ([#65860](https://github.com/kubernetes/kubernetes/pull/65860), [@sttts](https://github.com/sttts))

 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.gradle.internal.util.ports;

public interface ReservedPortRangeFactory {
    ReservedPortRange getReservedPortRange(int startPort, int endPort);

 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.gradle.internal.util.ports;

import java.io.IOException;
import java.net.DatagramSocket;
import java.net.ServerSocket;

public class DefaultPortDetector implements PortDetector {
    /**
     * Checks to see if a specific port is available.