Create connect-container.md

Author: Prajwal Koirala

Docker/connect-container.md

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+If you've exited or disconnected from a Docker container and want to reconnect to it, you can do so using Docker's built-in commands. Here’s how you can reconnect to a running or stopped container:
+
+### 1. **Reconnect to a Running Container**
+
+If your container is still running, you can use `docker attach` or `docker exec` to reconnect to it.
+
+#### Using `docker attach`
+
+The `docker attach` command will reattach your terminal to the container's main process. Note that this might not always be ideal if the container is running a service like a web server or application that doesn’t handle terminal input/output well.
+
+```bash
+docker attach my_ubuntu_container
+```
+
+#### Using `docker exec`
+
+A more flexible approach is using `docker exec` to start a new interactive session. This is especially useful if you want to run a new shell session:
+
+```bash
+docker exec -it my_ubuntu_container bash
+```
+
+This command starts a new Bash shell in the running container, allowing you to interact with it as if you had just started it.
+
+### 2. **Reconnect to a Stopped Container**
+
+If the container is stopped, you'll need to start it again before you can reconnect.
+
+#### Start the Container
+
+First, start the container:
+
+```bash
+docker start my_ubuntu_container
+```
+
+#### Reconnect to the Container
+
+After starting it, you can use `docker exec` to open a new session:
+
+```bash
+docker exec -it my_ubuntu_container bash
+```
+
+### 3. **Check Container Status**
+
+To see if your container is running or stopped, use:
+
+```bash
+docker ps -a
+```
+
+This command lists all containers, their statuses, and their IDs.
+
+### Summary
+
+- **Running Container**: Use `docker exec -it container_name bash` for a new interactive session.
+- **Stopped Container**: Use `docker start container_name` to start it, then `docker exec -it container_name bash` to reconnect.
+- **Container Status**: Check with `docker ps -a`.
+
+By following these steps, you should be able to reconnect to your Docker container, whether it's currently running or has been stopped.