And the **container** itself (in contrast to the **container image**) is the actual running instance of the image, comparable to a **process**. In fact, a container is running only when it has a **process running** (and normally it's only a single process). The container stops when there's no process running in it.

## Container Images { #container-images }

      new ListenerCallQueue.Event<Listener>() {
        @Override
        public void call(Listener listener) {
          listener.running();
        }

        @Override
        public String toString() {
          return "running()";
        }
      };
  private static final ListenerCallQueue.Event<Listener> STOPPING_FROM_STARTING_EVENT =
      stoppingEvent(STARTING);

    String result;
    if (state == DONE) {
      result = "running=[DONE]";
    } else if (state instanceof Blocker) {
      result = "running=[INTERRUPTED]";
    } else if (state instanceof Thread) {
      // getName is final on Thread, no need to worry about exceptions
      result = "running=[RUNNING ON " + ((Thread) state).getName() + "]";
    } else {
      result = "running=[NOT STARTED YET]";
    }

            final String sessionId = crawler.execute();

            // Wait for crawler to start running with polling
            long startTime = System.currentTimeMillis();
            while (crawler.crawlerContext.getStatus() != CrawlerStatus.RUNNING && System.currentTimeMillis() - startTime < 5000) {
                try {
                    Thread.sleep(50);

    }

    /**
     * Checks if the crawler is currently running.
     *
     * @return true if the crawler is running, false otherwise
     */
    public boolean isCrawlerRunning() {
        return crawlerRunning;
    }

    /**
     * Sets the crawler running status.
     *
     * @param crawlerRunning true to indicate the crawler is running, false otherwise
     */

    }

    /**
     * Checks if any processes are currently running.
     *
     * @return true if at least one process is running, false otherwise
     */
    public boolean isProcessRunning() {
        return !runningProcessMap.isEmpty();
    }

    /**
     * Checks if the process with the given session ID is currently running.
     *
     * @param sessionId unique identifier for the process session

     * @param roundEnv environment for information about the current and prior round
     * @return whether or not the set of annotations are claimed by this processor
     */
    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        logMessage(
                Diagnostic.Kind.NOTE, "Processing " + roundEnv.getRootElements().size() + " classes");

package org.codelibs.fess.crawler;

/**
 * Enum representing the status of a crawler.
 * It can be INITIALIZING, RUNNING, or DONE.
 */
public enum CrawlerStatus {
    /**
     * The crawler is initializing.
     */
    INITIALIZING,

    /**
     * The crawler is currently running.
     */
    RUNNING,

    /**
     * The crawler has completed its task.
     */
    DONE;

 */
public class MockWitnessService implements AutoCloseable {
    private static final Logger log = LoggerFactory.getLogger(MockWitnessService.class);

    private ServerSocket serverSocket;
    private final AtomicBoolean running = new AtomicBoolean(false);
    private final AtomicInteger registrationCounter = new AtomicInteger(0);
    private final ConcurrentHashMap<String, MockRegistration> registrations = new ConcurrentHashMap<>();

Let's check back those deployment concepts from before:

* Security - HTTPS
* Running on startup
* Restarts
* **Replication (the number of processes running)**
* Memory
* Previous steps before starting

Up to this point, with all the tutorials in the docs, you have probably been running a **server program**, for example, using the `fastapi` command, that runs Uvicorn, running a **single process**.