change dir name orch,container

Containerization-Orchestration/Docker/2-Commands.md

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+# **Docker Commands Guide**
+
+## **1. Docker Data Directories**
+Docker stores essential data, including images, containers, and volumes, in specific directories.
+
+- **`/var/lib/docker/`**: Main directory for Docker's data, including images, containers, and volumes.
+- **`/var/lib/docker/containers/`**: Stores configuration files for individual containers.
+- **`/var/lib/docker/volumes/`**: Stores data for Docker volumes, which persist beyond the container’s lifecycle.
+
+---
+
+## **2. Installing Docker on Ubuntu**
+
+### **Step 1: Update Package List and Install Dependencies**
+```bash
+sudo apt update && sudo apt install -y ca-certificates curl
+```
+- **`sudo apt update`**: Refreshes the package list.
+- **`sudo apt install -y ca-certificates curl`**: Installs certificates and `curl` to securely download Docker packages.
+
+### **Step 2: Add Docker’s GPG Key**
+```bash
+sudo install -m 0755 -d /etc/apt/keyrings 
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc 
+sudo chmod a+r /etc/apt/keyrings/docker.asc
+```
+- **`install -m 0755 -d /etc/apt/keyrings`**: Creates the `/etc/apt/keyrings` directory with appropriate permissions.
+- **`curl -fsSL <url> -o <file>`**: Downloads Docker’s GPG key.
+- **`chmod a+r`**: Grants read permissions for all users to the GPG key.
+
+### **Step 3: Add Docker’s Official Repository**
+```bash
+echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+```
+- Adds Docker’s repository to the Apt sources list.
+
+### **Step 4: Install Docker**
+```bash
+sudo apt update && sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+```
+- **`docker-ce`**: Installs Docker Community Edition.
+- **`docker-ce-cli`**: Docker command-line interface.
+- **`containerd.io`**: Container runtime.
+- **`docker-buildx-plugin`**: Provides advanced build functionality.
+- **`docker-compose-plugin`**: Manages multi-container applications.
+
+---
+
+## **3. Docker CLI Commands**
+
+### **3.1 Authentication**
+```bash
+docker login
+```
+- **`docker login`**: Logs into Docker Hub or a private registry by prompting for credentials.
+
+### **3.2 Image Management**
+- **Download an image:**
+  ```bash
+  docker pull <repo-addr>
+  ```
+  - Downloads an image from a repository.
+
+- **List images:**
+  ```bash
+  docker images
+  ```
+  - Displays all available images.
+
+- **Remove an image:**
+  ```bash
+  docker rmi -f <image-id>
+  ```
+  - Forcefully removes a specific image.
+
+- **Save an image as a `.tar` file:**
+  ```bash
+  docker save -o <file-location-and-name> <image-name>
+  ```
+
+- **Load an image from a `.tar` file:**
+  ```bash
+  docker load -i <file-location>
+  ```
+
+### **3.3 Container Management**
+- **Run a container:**
+  ```bash
+  docker run <options> <image-name>
+  ```
+
+- **Run an interactive container with a terminal:**
+  ```bash
+  docker run -it <image-name>
+  ```
+
+- **Run a container in detached mode:**
+  ```bash
+  docker run -dit <image-name>
+  ```
+
+- **Set a container to always restart:**
+  ```bash
+  docker run -dit --restart=always <image-name>
+  ```
+
+- **Name a container:**
+  ```bash
+  docker run -dit --name <container-name> <image-name>
+  ```
+
+- **Assign a hostname:**
+  ```bash
+  docker run -dit --hostname=<hostname> <image-name>
+  ```
+
+- **Set environment variables:**
+  ```bash
+  docker run -dit -e var1=data --name <container-name> --hostname=<hostname> <image-name>
+  ```
+
+- **Map host and container ports:**
+  ```bash
+  docker run -dit -p <host-port>:<container-port> <image-name>
+  ```
+
+- **Run a container with memory and CPU limits:**
+  ```bash
+  docker run -dit --name nginx --memory-reservation 150m --memory 500m nginx
+  ```
+  - Limits memory reservation to 150MB and usage to a maximum of 500MB.
+
+  ```bash
+  docker run -dit --name nginx --cpus 2 --cpu-shares 100 nginx
+  ```
+  - Limits the container to 2 CPUs.
+
+- **Stream container logs in real-time:**
+  ```bash
+  docker logs -f <container-name>
+  ```
+
+- **Access a container’s terminal:**
+  ```bash
+  docker exec -it <container-name> /bin/bash
+  ```
+
+- **Stop a container:**
+  ```bash
+  docker stop <container-name>
+  ```
+
+- **Remove a container:**
+  ```bash
+  docker rm <container-name>
+  ```
+
+- **Forcefully remove a running container:**
+  ```bash
+  docker rm -f <container-name>
+  ```
+
+- **List all container IDs (including stopped):**
+  ```bash
+  docker ps -aq
+  ```
+
+- **Prune stopped containers:**
+  ```bash
+  docker container prune
+  ```
+
+- **Commit a container to an image:**
+  ```bash
+  docker commit <container-name> <new-image-name>
+  ```
+
+- **Inspect container details:**
+  ```bash
+  docker inspect <container-name>
+  ```
+
+- **Copy files between host and container:**
+  ```bash
+  docker cp <file-on-local> <container-name>:/<container-path>
+  ```
+
+  ```bash
+  docker cp <container-name>:/<container-path> <local-path>
+  ```
+
+- **View real-time container resource usage:**
+  ```bash
+  docker stats
+  ```
+
+- **Build an image from a Dockerfile:**
+  ```bash
+  docker build -t <app-name>:<app-version> <path-to-dockerfile>
+  ```
+
+---
+
+## **4. Volume Management**
+Volumes store data that persists even when a container is deleted.
+
+- **List all volumes:**
+  ```bash
+  docker volume ls
+  ```
+
+- **Create a volume:**
+  ```bash
+  docker volume create <volume-name>
+  ```
+
+- **Inspect a volume:**
+  ```bash
+  docker volume inspect <volume-name>
+  ```
+
+- **Mount a volume to a container:**
+  ```bash
+  docker run -dit --name <container-name> -v <volume-name>:<container-path> <image-name>
+  ```
+
+- **Mount a file with read-only access:**
+  ```bash
+  docker run -dit --name nginx -v /etc/resolv.conf:/etc/resolv.conf:ro nginx
+  ```
+
+- **Mount temporary filesystem in memory:**
+  ```bash
+  docker run -dit --name nginx --tmpfs /opt:100M nginx
+  ```
+
+---
+
+## **5. Network Management**
+Docker networks allow communication between containers.
+
+- **List all networks:**
+  ```bash
+  docker network ls
+  ```
+
+- **Create a network:**
+  ```bash
+  docker network create <network-name>
+  ```
+
+- **Create a custom network with subnet and gateway:**
+  ```bash
+  docker network create --subnet <subnet> --gateway <gateway-ip> --driver=<network-type> <network-name>
+  ```
+
+- **Run a container on a specific network:**
+  ```bash
+  docker run -dit --name <container-name> --network <network-name> <image-name>
+  ```
+
+- **Connect a running container to a network:**
+  ```bash
+  docker network connect <network-name> <container-name>
+  ```
+
+- **Disconnect a container from a network:**
+  ```bash
+  docker network disconnect <network-name> <container-name>
+  ```
+
+  ---
+
+## **6. System Commands**
+
+- **Show Docker Disk usage:**
+  ```bash
+    docker system df 
+  ```
+- **Remove Unuse Cache,Container And More**
+- ```bash
+-   docker system prune
+- ```
+-
+-