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Coding

How to Access a Docker Container

Method 1: Interactive Session (Also the Most Common)

To work directly inside a running container create a shell session like SSH into a server.

Get Container ID or Name: Use docker ps to list running containers.

Interactive Shell:

docker exec -it <container_id or name> /bin/bash which is common for most Linux containers.

docker exec -it <container_id or name> cmd for Windows containers.

Now Inside: You’re now inside the container and can run commands, look at files or whatever else you want to do.

Method 2: Executing a Single Command

To run a command without getting an interactive shell you should do this.

docker exec <container_id or name> <command>

Example: docker exec my_webserver ls -la /var/www

Method 3: Copying Files

To transfer files between your host machine and the container do this.

docker cp

Example of copying from container to host: docker cp my_app:/app/data.txt

Example of copying from host into container: docker cp backup.sql my_db:/backups

Method 4: Port Mapping

For accessing services inside the container from your host machine try this.

During Launch: When starting the container, use the -p flag.

Example: docker run -d -p 8080:80 nginx maps port 8080 of your machine to port 80 inside the container.

Access via Browser: If container runs a web server, access it like http://localhost:8080

Important Things

Running Containers: Methods 1 and 2 need the container to be already running.

Base Image Matters: For interactive shells like /bin/bash, the container needs the relevant tools installed in its base image.

Troubleshooting

Cannot Connect: Check if your container’s process is running and if ports are exposed correctly.

“Command Not Found” Errors: Make sure the commands you’re trying to run exist inside the container’s image.

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