[Docker] How to Attach to a Running Container

To interact with the input, output, or error streams of a running Docker container, you can use the attach command. Follow these steps:

Step 1: Start a Nginx web server container:

docker run -d --name nginx -p 8080:80 nginx:alpine

Step 2: Ensure Nginx is running:

curl -4 localhost:8080

Step 3: Attach to the Nginx container:

docker attach nginx

Step 4: In another terminal, run:

for n in {1..10}; do curl -4 localhost:8080; done;

Step 5: You will see the Nginx log output.

Step 6: Exit with Ctrl + C.

Step 8: Clean up by removing the Nginx container:

docker container rm --force nginx

Congratulations, you've successfully attached to and interacted with the Nginx container!