Run Your First Docker Container (2026 Step-by-Step)

Quick one-liner: Learn how to run your first Docker container — from finding images on Docker Hub to accessing the container shell and cleaning up properly.

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Why This Matters

Now that Docker is installed, it's time to run your first container.

If you're like most people starting with Docker, you might be tempted to just copy-paste commands without understanding what they do. I've been there. But here's the thing: knowing what each flag does means you'll understand what's happening when you run a container.

This guide walks you through running your first real container, step by step. No copy-paste without explanation. Every command broken down.

By the end, you'll know how to:

• Find and pull images from Docker Hub
• Run containers with the right flags
• Access a running container's shell

• Stop and clean up properly

  Prerequisites

• Docker installed (rootless mode recommended — see Ubuntu guide or SLES guide)

• 5 minutes to run your first container

• Terminal access to your Docker host

  Finding Images on Docker Hub

Docker Hub is the primary registry for Docker images. Think of it as an app store for containers.

You can browse at hub.docker.com or search from the command line:

$ docker search nginx

Look for images with the Official badge — these are maintained by the software's creators and are regularly updated with security patches.

My advice: If there's an official image, use it. It's more likely to be secure, up-to-date, and well-maintained.

If there's no official image, look for:

• High download counts
• Recent updates
• Good star ratings

Each image page shows:

• Available tags (versions) — for example, nginx:latest, nginx:1.25, nginx:alpine
• Usage instructions and supported environment variables
• Pull count and last update date

Note: When no tag is specified, Docker uses latest by default. For production, pin to a specific version like nginx:1.25 so your builds don't break when a new version drops.

Running Your First Container

Let's run nginx — the most popular web server.

$ docker container run -d --rm --name dtnginx nginx

Let me break down each flag:

Flag	What It Does
-d	Detach — runs in the background so your terminal stays free
--rm	Auto-remove — deletes the container when it stops (keeps things clean)
--name dtnginx	Name it — use "dtnginx" instead of a random ID like "a1b2c3d4e5f6"
nginx	The image — pulled from Docker Hub if not already present

The first time you run this, Docker downloads the image:

Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx
09f376ebb190: Pull complete
5529e0792248: Pull complete
Status: Downloaded newer image for nginx:latest

And... done. The container is now running in the background. You didn't see anything pop up, but trust me, it's there.

Checking Container Status

Let's verify it's actually running.

$ docker ps

You should see:

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a1b2c3d4e5f6 nginx "/docker-entrypoint..." 5 sec Up 4 seconds 80/tcp dtnginx

A few things to note:

• CONTAINER ID — you can use this to manage the container. But since we gave it a name (dtnginx), just use that. It's way easier to remember.
• PORTS — shows nginx is listening on port 80 inside the container. You can't access it from your host yet — we'll cover port forwarding in a later post.
• STATUS — "Up 4 seconds" means it's running.

To see all containers (including stopped ones):

$ docker ps -a

Accessing the Container Shell

Here's something cool — you can open a shell inside a running container.

$ docker exec -it dtnginx /bin/bash

Let me explain the flags:

Flag	What It Does
-i	Keeps standard input open — so you can type commands
-t	Allocates a terminal — so you get a proper prompt

Together, -it is what you'll use 99% of the time.

Important: The best command to access a container depends on what's inside.

• nginx, Ubuntu, Debian → /bin/bash works

• Alpine-based images → Use /bin/sh instead (bash isn't installed)

• Redis → Has /bin/bash and /bin/sh, but redis-cli is more useful for interacting with the database

Always check the image documentation on Docker Hub to see what's available.

You're now inside the container. Check the prompt — it probably says something like root@a1b2c3d4e5f6.

You're root inside this container. But remember, this is isolated from your host system.

Let's verify nginx is actually running. The official nginx image includes curl:

dtnginx# curl localhost

You should see the default nginx welcome page HTML:

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
...

Exit the container shell:

dtnginx# exit

And you're back on your host system.

Stopping and Cleaning Up

To stop the container:

$ docker stop dtnginx

Because we used --rm when we created it, the container is automatically removed after stopping.

Let's confirm:

$ docker ps -a

If you don't see dtnginx, that's good — it was automatically removed.

Note: If you had started a container without --rm, it would stick around in a stopped state. In that case, you'd need to clean it up manually:

docker rm dtnginx

Good habit to get into — clean up your stopped containers. If you have the containers from previous tutorials that are not removed and randomly named, you can remove them using the following command:

$ docker container rm container_id

Exercise

Try it yourself.

Part 1: nginx with Shell Access

1. Run an nginx container named dtnginx in detached mode without the --rm flag
2. Access the shell with docker exec -it dtnginx /bin/bash
3. Verify nginx is running by running curl localhost inside the container
4. Exit the container shell
5. Stop the container with docker stop dtnginx
6. Verify that it was not removed with docker ps -a
7. Remove the container with docker rm dtnginx

Part 2: Redis with redis-cli (No Shell Needed)

Not all containers require a shell to be useful. Redis is a great example — while it does have /bin/bash and /bin/sh available, the native redis-cli tool is far more useful for interacting with the database.

1. Run a Redis container named dtredis with the --rm flag:

docker run -d --rm --name dtredis redis

1. Access Redis using redis-cli directly:

docker exec -it dtredis redis-cli

1. Set and get a key :

127.0.0.1:6379> SET mykey "Hello from Docker!"
OK
127.0.0.1:6379> GET mykey
"Hello from Docker!"

1. Exit redis-cli :

127.0.0.1:6379> exit

1. Stop the container :

docker stop dtredis

Key takeaway: The command you use to access a container depends on what's inside. For shells, try /bin/bash first, then /bin/sh. For databases and specialized applications, use their native CLI tools (redis-cli, psql, mysql, etc.) — they're often more useful than a generic shell.

What's Next

Now that you've run your first container, you can:

• Try other images — Redis, PostgreSQL, Node.js, Python
• Learn about port forwarding — make your container accessible from outside
• Explore container networking — connect containers to each other

Coming up: Learn how to manage your Docker environment — listing images, viewing logs, using environment variables, and cleaning up disk space. Then we'll cover Docker volumes to keep your data safe across container restarts.

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Want More?

This guide covers the basics from Chapter 3: Running Docker Images in my book, "Levelling Up with Docker" — 14 chapters of practical, hands-on Docker guides.

📚 Grab the book: "Levelling Up with Docker" on Amazon

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Published: 17 Mar 2026

Author: David Tio

Tags: Docker, Beginners, Tutorial, Linux, DevOps, Container

Word Count: ~900