103 lines
10 KiB
Markdown
Executable File
103 lines
10 KiB
Markdown
Executable File
# HTTP Status Codes Table
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| Status Code | Category | Description |
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|-------------|------------------------|---------------------------------------------------------------------------------------|
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| **100** | Informational (1xx) | Continue: The client should continue with its request. |
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| **101** | Informational (1xx) | Switching Protocols: Server is switching protocols. |
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| **102** | Informational (1xx) | Processing (WebDAV): Server has received and is processing the request. |
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| **200** | Success (2xx) | OK: The request was successful. |
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| **201** | Success (2xx) | Created: The request was successful and a resource was created. |
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| **202** | Success (2xx) | Accepted: The request has been accepted for processing. |
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| **203** | Success (2xx) | Non-Authoritative Information: The server is a proxy, not the original. |
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| **204** | Success (2xx) | No Content: The server successfully processed the request, but no content is returned.|
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| **205** | Success (2xx) | Reset Content: The client should reset the view. |
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| **206** | Success (2xx) | Partial Content: The server is delivering part of the resource (range requests). |
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| **300** | Redirection (3xx) | Multiple Choices: Multiple options for the resource are available. |
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| **301** | Redirection (3xx) | Moved Permanently: The resource has moved permanently to a new URI. |
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| **302** | Redirection (3xx) | Found: The resource is temporarily at a different URI. |
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| **303** | Redirection (3xx) | See Other: The response is at another URI. |
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| **304** | Redirection (3xx) | Not Modified: The resource has not been modified since the last request. |
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| **305** | Redirection (3xx) | Use Proxy: The requested resource is available only through a proxy. |
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| **307** | Redirection (3xx) | Temporary Redirect: The resource resides temporarily at a different URI. |
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| **308** | Redirection (3xx) | Permanent Redirect: The resource has moved permanently, and this URI should be used. |
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| **400** | Client Errors (4xx) | Bad Request: The server could not understand the request due to invalid syntax. |
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| **401** | Client Errors (4xx) | Unauthorized: Authentication is required and has failed. |
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| **402** | Client Errors (4xx) | Payment Required: Reserved for future use. |
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| **403** | Client Errors (4xx) | Forbidden: The request was understood but refuses to authorize it. |
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| **404** | Client Errors (4xx) | Not Found: The resource could not be found. |
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| **405** | Client Errors (4xx) | Method Not Allowed: The request method is not supported for the resource. |
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| **406** | Client Errors (4xx) | Not Acceptable: The resource cannot produce content acceptable to the client. |
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| **407** | Client Errors (4xx) | Proxy Authentication Required: The client must authenticate with the proxy first. |
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| **408** | Client Errors (4xx) | Request Timeout: The server timed out waiting for the request. |
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| **409** | Client Errors (4xx) | Conflict: The request could not be processed because of a conflict. |
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| **410** | Client Errors (4xx) | Gone: The resource is no longer available. |
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| **411** | Client Errors (4xx) | Length Required: The request did not specify the length. |
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| **412** | Client Errors (4xx) | Precondition Failed: The preconditions set by the client were not met. |
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| **413** | Client Errors (4xx) | Payload Too Large: The request is too large to process. |
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| **414** | Client Errors (4xx) | URI Too Long: The URI provided was too long for the server to process. |
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| **415** | Client Errors (4xx) | Unsupported Media Type: The media type of the request is not supported. |
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| **416** | Client Errors (4xx) | Range Not Satisfiable: The client requested a portion that cannot be supplied. |
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| **417** | Client Errors (4xx) | Expectation Failed: The server cannot meet the expectation of the request. |
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| **418** | Client Errors (4xx) | I'm a teapot (RFC 2324): An April Fools' joke code. |
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| **421** | Client Errors (4xx) | Misdirected Request: The request was directed at a wrong server. |
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| **422** | Client Errors (4xx) | Unprocessable Entity (WebDAV): The request was well-formed but semantic errors exist. |
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| **423** | Client Errors (4xx) | Locked (WebDAV): The resource being accessed is locked. |
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| **424** | Client Errors (4xx) | Failed Dependency (WebDAV): A previous request failed, causing this one to fail. |
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| **425** | Client Errors (4xx) | Too Early: The server is unwilling to process this request yet. |
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| **426** | Client Errors (4xx) | Upgrade Required: The client needs to switch to a different protocol. |
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| **428** | Client Errors (4xx) | Precondition Required: The server requires the request to be conditional. |
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| **429** | Client Errors (4xx) | Too Many Requests: Too many requests sent in a given amount of time. |
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| **431** | Client Errors (4xx) | Request Header Fields Too Large: The request's header fields are too large. |
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| **451** | Client Errors (4xx) | Unavailable For Legal Reasons: The resource is unavailable for legal reasons. |
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| **500** | Server Errors (5xx) | Internal Server Error: An unexpected server error occurred. |
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| **501** | Server Errors (5xx) | Not Implemented: The server lacks the ability to fulfill the request. |
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| **502** | Server Errors (5xx) | Bad Gateway: Received an invalid response from the upstream server. |
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| **503** | Server Errors (5xx) | Service Unavailable: The server is overloaded or down for maintenance. |
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| **504** | Server Errors (5xx) | Gateway Timeout: No timely response from the upstream server. |
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| **505** | Server Errors (5xx) | HTTP Version Not Supported: The server does not support the HTTP version. |
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| **506** | Server Errors (5xx) | Variant Also Negotiates: Internal configuration error. |
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| **507** | Server Errors (5xx) | Insufficient Storage (WebDAV): The server cannot store the representation. |
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| **508** | Server Errors (5xx) | Loop Detected (WebDAV): The server detected an infinite loop while processing. |
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| **510** | Server Errors (5xx) | Not Extended: Extensions are required for the server to fulfill the request. |
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| **511** | Server Errors (5xx) | Network Authentication Required: Client must authenticate to gain network access. |
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---
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# Docker Image Layers
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A **Docker image** is composed of multiple layers that work together to create a fully functional container. Each layer represents a step in the build process, and layers are stacked on top of one another to form the complete image.
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### Structure of a Docker Image:
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1. **BootFS (Boot File System):**
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- **Description:** This is the bottom-most layer in the Docker image. It includes files and directories needed to boot up a system.
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- **Function:** It sets up the foundation for the base operating system within the container, similar to the host machine’s `/boot` folder.
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2. **Base Image:**
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- **Description:** The base image is typically a minimal operating system (e.g., Ubuntu, Alpine Linux) or any other image that acts as a starting point for your container.
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- **Examples:** Ubuntu, Alpine, Debian.
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- **Function:** Provides the core OS functionalities and dependencies needed for the higher layers.
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3. **Libraries:**
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- **Description:** Libraries required by the applications running in the container.
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- **Examples:** libc, libssl, or any other standard libraries needed by the applications.
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- **Function:** Provides necessary functionality for applications, ensuring they can function correctly within the container.
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4. **Packages and Applications:**
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- **Description:** Specific software, tools, or libraries that your application depends on.
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- **Examples:** vim, curl, git, node.js, or custom software required by your application.
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- **Function:** These packages allow you to run applications and scripts necessary for the container's purpose.
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5. **User Application (Optional):**
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- **Description:** The main application code that you intend to run within the container.
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- **Examples:** A web server like Apache, Nginx, or any microservice application.
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- **Function:** It is the purpose of the container, which could be serving web traffic, processing data, or any other specific task.
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### Writable Layer (Container-Specific):
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- **Description:** Once a container is created from a Docker image, a writable layer is added on top of the image layers.
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- **Function:** Any changes made during the container's runtime (like creating files or modifying configurations) are stored in this writable layer.
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- **Key Point:** Changes to the writable layer do not impact the underlying image layers.
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---
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