https://github.com/markphamm/docker
A hands-on repository documenting my journey learning Docker — from container basics to building and orchestrating real-world applications.
https://github.com/markphamm/docker
Last synced: 30 days ago
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A hands-on repository documenting my journey learning Docker — from container basics to building and orchestrating real-world applications.
- Host: GitHub
- URL: https://github.com/markphamm/docker
- Owner: MarkPhamm
- License: mit
- Created: 2025-04-20T19:50:30.000Z (about 1 month ago)
- Default Branch: main
- Last Pushed: 2025-04-20T20:33:11.000Z (about 1 month ago)
- Last Synced: 2025-04-20T20:33:23.760Z (about 1 month ago)
- Size: 0 Bytes
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# 🐳 Exploring Docker Commands
A hands-on repository documenting my journey learning Docker — from container basics to building and orchestrating real-world applications.
# Understanding Docker Concepts
1. **Container:** A lightweight, standalone, and executable package that includes everything needed to run a piece of software.
2. **Image:** Think of this as a template or blueprint for containers. It contains all the instructions needed to create a container.
3. **Docker Hub:** Like GitHub but for Docker images — it's where you can find and share container images.
4. **Docker Engine:** The core technology that runs and manages containers on your machine.
---
- The **Docker Engine** runs containers
- **Images** are used to create containers
- **Docker Hub** stores images
- The Docker Engine can **pull** images from and **push** images to Docker Hub
---
Sure! Here's the revised Markdown version with a clearer hierarchy and only the Docker command section featuring an icon:
---
# Docker Command
## `docker run hello-world`
```bash
docker run hello-world
```
- **`docker`** – CLI to interact with Docker Engine
- **`run`** – Instructs Docker to create and start a container
- **`hello-world`** – The name of the image to run
---
**What Happens When You Run This**
1. Docker checks if the `hello-world` image exists locally
2. If not, it pulls the image from Docker Hub
3. A new container is created from the image
4. The container runs, prints a message, then exits
---
**Behind the Scenes**
- The **Docker client** sends the command to the **Docker daemon**
- The daemon pulls the image from Docker Hub if needed
- It creates and starts a container from that image
- The container’s output is printed in your terminal
---
## `docker images`
```bash
docker images
```
Example Output
```
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest feb5d9fea6a5 2 weeks ago 13.3kB
```
**Column Breakdown**
- **REPOSITORY** – Name of the image (e.g., `hello-world`)
- **TAG** – Version label (default is `latest`)
- **IMAGE ID** – Unique identifier for the image
- **CREATED** – When the image was built
- **SIZE** – Disk space used by the image
## `docker ps`
Lists all **running containers** on your system.
```bash
docker ps
```
- Shows container ID, image, status, ports, and more
- Add `-a` to see **all containers**, including stopped ones:
```bash
docker ps -a
```
---
# Docker Hub
🔗 [https://hub.docker.com/](https://hub.docker.com/)
On an image's page, you can typically find:
- A description of the image
- Usage instructions
- The number of pulls (downloads) the image has
- Available tags (versions)
Docker Hub is where Docker looks for images when you run a `docker run` command and the image isn’t available locally. This is why you were able to run the `hello-world` container even if you hadn't downloaded it beforehand.
---
## Key Points About Docker Hub
- **Official Images**
Curated by Docker, these images are typically well-maintained and documented. Great for beginners and production use.
- **Tags**
Images can have multiple versions, called **tags** (e.g., `latest`, `1.0`, `2.1`).
If you don’t specify a tag (as in `docker run hello-world`), Docker defaults to using the `latest` tag.
- **Pull Command**
Each image page shows a pull command you can use to manually download the image without running it.
Example:
```bash
docker pull hello-world
```
- **Dockerfile**
Many images provide a link to their `Dockerfile`, which is the script used to build the image. Reviewing it can help you understand what’s inside the image and how it was created.
---