added Docker Essential commands

04-containers/Docker_Essential_CheetSheet.md

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+# Essential Docker Commands Cheat Sheet
+
+---
+
+## **General Commands**
+
+1. **Check Docker Version:**
+   ```bash
+   docker --version
+   ```
+
+2. **Show System-Wide Docker Information:**
+   ```bash
+   docker info
+   ```
+
+---
+
+## **Container Lifecycle**
+
+1. **List Running Containers:**
+   ```bash
+   docker ps
+   ```
+
+2. **List All Containers (Running and Stopped):**
+   ```bash
+   docker ps -a
+   ```
+
+3. **Restart a Stopped Container:**
+   ```bash
+   docker start <container_id>
+   ```
+
+4. **Stop a Running Container:**
+   ```bash
+   docker stop <container_id>
+   ```
+
+5. **Access a Running Container (Interactive Mode):**
+   ```bash
+   docker exec -it <container_id> bash
+   ```
+
+6. **Remove a Specific Container:**
+   ```bash
+   docker rm <container_id>
+   ```
+
+---
+
+## **Advanced Commands**
+
+1. **Run a Container in Detached Mode:**
+   ```bash
+   docker run -d <image_name>
+   ```
+
+2. **Remove All Stopped Containers, Unused Images, and Volumes:**
+   ```bash
+   docker system prune -a --volumes
+   ```
+
+3. **Run a Container with Resource Limits:**
+   ```bash
+   docker run --memory="512m" --cpus="1" <image_name>
+   ```
+
+---
+
+## **Image Management**
+
+1. **List All Docker Images:**
+   ```bash
+   docker images
+   ```
+
+2. **Pull a Specific Image from Docker Hub:**
+   ```bash
+   docker pull <image_name>:<tag>
+   ```
+   Example:
+   ```bash
+   docker pull ubuntu:20.04
+   ```
+
+3. **Export an Image to a `.tar` File:**
+   ```bash
+   docker save -o my_image.tar <image_name>:<tag>
+   ```
+
+4. **Load an Image from a `.tar` File:**
+   ```bash
+   docker load -i my_image.tar
+   ```
+
+5. **Tag an Image:**
+   ```bash
+   docker tag <image_id> <new_image_name>:<tag>
+   ```
+
+6. **Push an Image to a Docker Registry:**
+   ```bash
+   docker push <image_name>:<tag>
+   ```
+
+7. **Remove a Specific Image:**
+   ```bash
+   docker rmi <image_id>
+   ```
+
+8. **Remove All Unused Images:**
+   ```bash
+   docker image prune -a
+   ```
+
+---
+
+## **Saving, Importing, and Exporting**
+
+1. **Save a Docker Image to a `.tar` File:**
+   ```bash
+   docker save -o my_image.tar <image_name>:<tag>
+   ```
+
+2. **Load a Docker Image from a `.tar` File:**
+   ```bash
+   docker load -i my_image.tar
+   ```
+
+3. **Export a Container to a `.tar` File:**
+   ```bash
+   docker export -o my_container.tar <container_id>
+   ```
+
+4. **Import a Container's Filesystem from a `.tar` File:**
+   ```bash
+   cat my_container.tar | docker import - my_container
+   ```
+
+---
+
+## **Volume Management**
+
+1. **List All Volumes:**
+   ```bash
+   docker volume ls
+   ```
+
+2. **Create a Named Volume:**
+   ```bash
+   docker volume create <volume_name>
+   ```
+
+3. **Inspect a Volume:**
+   ```bash
+   docker volume inspect <volume_name>
+   ```
+
+4. **Remove a Volume:**
+   ```bash
+   docker volume rm <volume_name>
+   ```
+
+---
+
+## **Networking**
+
+1. **List Docker Networks:**
+   ```bash
+   docker network ls
+   ```
+
+2. **Create a Docker Network:**
+   ```bash
+   docker network create <network_name>
+   ```
+
+3. **Connect a Container to a Network:**
+   ```bash
+   docker network connect <network_name> <container_id>
+   ```
+
+4. **Disconnect a Container from a Network:**
+   ```bash
+   docker network disconnect <network_name> <container_id>
+   ```
+
+---
+
+## **Debugging and Troubleshooting**
+
+1. **View Container Logs:**
+   ```bash
+   docker logs <container_id>
+   ```
+
+2. **Inspect Container Details:**
+   ```bash
+   docker inspect <container_id>
+   ```
+
+3. **Check Resource Usage of Containers:**
+   ```bash
+   docker stats
+   ```
+
+4. **Check Disk Usage of Docker Resources:**
+   ```bash
+   docker system df
+   ```
+
+---
+
+
+## **Commands for Docker Compose**
+
+1. **Start Services Defined in `docker-compose.yml`:**
+   ```bash
+   docker-compose up
+   ```
+
+2. **Stop Services:**
+   ```bash
+   docker-compose down
+   ```
+
+3. **Rebuild and Start Services:**
+   ```bash
+   docker-compose up --build
+   ```
+
+4. **Check Logs of Services:**
+   ```bash
+   docker-compose logs
+   ```
+
+---
+
+
+## **Key Cleanup Commands**
+
+1. **Stop All Running Containers:**
+   ```bash
+   docker stop $(docker ps -q)
+   ```
+
+2. **Remove All Containers (Stopped or Running):**
+   ```bash
+   docker rm $(docker ps -aq)
+   ```
+
+3. **Remove All Unused Images:**
+   ```bash
+   docker image prune -a
+   ```
+
+4. **Remove All Docker Resources (DANGEROUS):**
+   ```bash
+   docker system prune -a --volumes
+   ```