## What is a Container Image { #what-is-a-container-image }

A **container** is run from a **container image**.

A container image is a **static** version of all the files, environment variables, and the default command/program that should be present in a container. **Static** here means that the container **image** is not running, it's not being executed, it's only the packaged files and metadata.

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                return false;
            }

            String mimeTypeStr = mimeType.toString();
            // Support PDF and common image formats
            return "application/pdf".equals(mimeTypeStr) || "image/jpeg".equals(mimeTypeStr) || "image/png".equals(mimeTypeStr);
        }

        @Override
        public boolean isAvailable() {
            return available;
        }

        Exception cause = new RuntimeException("Image processing error");
        ThumbnailGenerationException exception = new ThumbnailGenerationException(message, cause);

        assertEquals(message, exception.getMessage());
        assertEquals(cause, exception.getCause());
        assertEquals("Image processing error", exception.getCause().getMessage());
    }

version: '3.7'

# Settings and configurations that are common for all containers
x-minio-common: &minio-common
  image: quay.io/minio/minio:RELEASE.2025-09-06T17-38-46Z
  command: server --console-address ":9001" http://minio{1...4}/data{1...2}
  expose:
    - "9000"
    - "9001"
  # environment:
    # MINIO_ROOT_USER: minioadmin
    # MINIO_ROOT_PASSWORD: minioadmin
  healthcheck:
    test: ["CMD", "mc", "ready", "local"]
    interval: 5s

import okio.BufferedSink
import okio.ForwardingSink
import okio.buffer

class UploadProgress {
  companion object {
    private const val IMGUR_CLIENT_ID = "9199fdef135c122"
    private val MEDIA_TYPE_PNG = "image/png".toMediaType()
  }

  private val client = OkHttpClient()

  @Throws(Exception::class)
  fun run() {
    val progressListener =
      object : ProgressListener {
        private var firstUpdate = true

      private val client = OkHttpClient()

      fun run() {
        // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
        val requestBody = MultipartBody.Builder()
            .setType(MultipartBody.FORM)
            .addFormDataPart("title", "Square Logo")
            .addFormDataPart("image", "logo-square.png",
                File("docs/images/logo-square.png").asRequestBody(MEDIA_TYPE_PNG))

	sf.line, sf.col = val.Line, val.Column
	return nil
}

// InRange returns true in the following cases and false otherwise,
// - sf.LowerBound < sz, when sf.LowerBound alone is specified
// - sz < sf.UpperBound, when sf.UpperBound alone is specified
// - sf.LowerBound < sz < sf.UpperBound when both are specified,
func (sf BatchJobSizeFilter) InRange(sz int64) bool {
	if sf.UpperBound > 0 && sz > int64(sf.UpperBound) {

/// info

Notice how the `images` key now has a list of image objects.

///

## Deeply nested models { #deeply-nested-models }

You can define arbitrarily deeply nested models:

{* ../../docs_src/body_nested_models/tutorial007_py310.py hl[7,12,18,21,25] *}

/// info

Notice how `Offer` has a list of `Item`s, which in turn have an optional list of `Image`s

///

  private static final String IMGUR_CLIENT_ID = "9199fdef135c122";
  private static final MediaType MEDIA_TYPE_PNG = MediaType.get("image/png");

  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
    final ProgressListener progressListener = new ProgressListener() {
      boolean firstUpdate = true;