radin/my-docs

Fork 0

Files

RadinPirouz 6beeea3e5c change dir name orch,container

2025-10-04 09:53:08 +03:30

6.7 KiB

Executable File

Raw Blame History

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

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

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

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

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

docker login

docker login: Logs into Docker Hub or a private registry by prompting for credentials.

3.2 Image Management

Download an image:
```
docker pull <repo-addr>
```
- Downloads an image from a repository.
List images:
```
docker images
```
- Displays all available images.
Remove an image:
```
docker rmi -f <image-id>
```
- Forcefully removes a specific image.

Save an image as a .tar file:

docker save -o <file-location-and-name> <image-name>

Load an image from a .tar file:
```
docker load -i <file-location>
```

3.3 Container Management

Run a container:
```
docker run <options> <image-name>
```
Run an interactive container with a terminal:
```
docker run -it <image-name>
```
Run a container in detached mode:
```
docker run -dit <image-name>
```

Set a container to always restart:

docker run -dit --restart=always <image-name>

Name a container:

docker run -dit --name <container-name> <image-name>

Assign a hostname:

docker run -dit --hostname=<hostname> <image-name>

Set environment variables:

docker run -dit -e var1=data --name <container-name> --hostname=<hostname> <image-name>

Map host and container ports:

docker run -dit -p <host-port>:<container-port> <image-name>

Run a container with memory and CPU limits:

docker run -dit --name nginx --memory-reservation 150m --memory 500m nginx

Limits memory reservation to 150MB and usage to a maximum of 500MB.

docker run -dit --name nginx --cpus 2 --cpu-shares 100 nginx

Limits the container to 2 CPUs.

Stream container logs in real-time:
```
docker logs -f <container-name>
```

Access a container’s terminal:

docker exec -it <container-name> /bin/bash

Stop a container:
```
docker stop <container-name>
```
Remove a container:
```
docker rm <container-name>
```
Forcefully remove a running container:
```
docker rm -f <container-name>
```
List all container IDs (including stopped):
```
docker ps -aq
```
Prune stopped containers:
```
docker container prune
```

Commit a container to an image:

docker commit <container-name> <new-image-name>

Inspect container details:
```
docker inspect <container-name>
```

Copy files between host and container:

docker cp <file-on-local> <container-name>:/<container-path>

docker cp <container-name>:/<container-path> <local-path>

View real-time container resource usage:
```
docker stats
```

Build an image from a Dockerfile:

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:
```
docker volume ls
```
Create a volume:
```
docker volume create <volume-name>
```
Inspect a volume:
```
docker volume inspect <volume-name>
```

Mount a volume to a container:

docker run -dit --name <container-name> -v <volume-name>:<container-path> <image-name>

Mount a file with read-only access:

docker run -dit --name nginx -v /etc/resolv.conf:/etc/resolv.conf:ro nginx

Mount temporary filesystem in memory:

docker run -dit --name nginx --tmpfs /opt:100M nginx

5. Network Management

Docker networks allow communication between containers.

List all networks:
```
docker network ls
```
Create a network:
```
docker network create <network-name>
```

Create a custom network with subnet and gateway:

docker network create --subnet <subnet> --gateway <gateway-ip> --driver=<network-type> <network-name>

Run a container on a specific network:

docker run -dit --name <container-name> --network <network-name> <image-name>

Connect a running container to a network:

docker network connect <network-name> <container-name>

Disconnect a container from a network:

docker network disconnect <network-name> <container-name>

6. System Commands

Show Docker Disk usage:
```
  docker system df 
```
Remove Unuse Cache,Container And More
docker system prune

6.7 KiB Executable File Raw Blame History Unescape Escape