Docker

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Index

• Basic docker commands

• Building and running image

• Other docker commands

• Docker hub

• Docker volumes

• Docker Networks

  • Bridge networks
  • Host network
  • None

• Docker Web-Interface (portainer-ce)

• Dockerfile

• Docker compose

• Sources

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Installing docker

# Remove previous installs
for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done


# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

# Install docker
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin 

Pls dont use this

## PLS DONT USE THS
# for debian/ubuntu users
sudo apt update
sudo apt install docker.io

# for fedora users
sudo dnf install docker

# for arch users
sudo pacman -S docker

Running docker daemon

sudo systemctl enable --now docker.service

For adding user to docker group

sudo usermod -aG docker $USER

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Basic docker commands

1. HELP 🆘

docker help

2. Current running docker processes (containers) 🏃

docker ps

docker ps -a

• -a --> to get all the running containers
• -q --> to get just the container id

3. Stopping and Removing 🛑

docker stop [container_id]
docker rm [docker_id]

docker stop $(docker ps -a -q)
docker rm $(docker ps -a -q)

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Building and running image

1. For building docker image 🏗️

docker build -t [image_name] [dir_of_Dockerfile]

2. For creating & running docker image 🏃

docker run --nane [container_name] [image_name]

• can add -rm for stooping and removing docker as u exit
• can add -d for detaching it from terminal after running (if ur using default bridge network)
• add -p [host_port]:[docker_port] for mapping a specific docker port to host port

3. For executing something inside docker image 🖱️

docker exec [file/command_wanna_run] [container_name]

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Other docker commands

1. KILL IT 🔪💀

docker kill [container_id]

2. Logs 📃

docker logs [container_id]

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Docker hub

1. Pull

docker pull [image_name]:[tag]

• list of docker image

  docker image ls

2. Tag

docker tag [image_id] [image_name]:[tag]

3. Push

docker push [image_name]:[tag]    # default tag is "latest"

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Docker volumes

1. create

docker volume create [volume_name]

2. manage

docker volume list
docker colume inspect [volume_name]

3. mount

# for mounting docker volume 
docker run -v [volume_name]:[path_in_container] [docker_image]

# for mounting host directry
docker run -v "[host_directry]":[volume_name] [docker_image]

4. remove

docker volume rm [volume_name]

docker volume prune   # to remove all unused volumes

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Docker Networks

1. Creating network

docker network create [network_name]

2. Connect

docker network connect [network_name] [container_name]

3. Disconnect

docker network disconect [network_name] [container_name]

2. List & Inspect

docker network ls

docker inspect [network_name]

3. Delete network

docker network rm [network_name]

doceker network prune    #delete all unused network

Default networks

1. Bridge networks
2. Host network
3. None

Other networks

4. macvlan
5. ipvlan
6. overlay

(There are other possible P&C too....)

Parameters (flags)

• --subnet 172.76.0.0/16 --> to define subnet
• --gateway 172.76.0.1/16 --> to define the gateway of the network
• -o parent=[network_interface] --> to define the physical network interface

Bridge network

It's the default one no need for any flags.

User-Defined Bridge Network

docker network create [network_name]
docker run --network [network_name] [container_id] [image_name]

Host network

docker run --network host [container_id] [image_name]

None

docker run --network none [container_id] [image_name]

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Docker Web-Interface

portainer-ce

1. Instalation

Create a docker voume or direct mount to a host directry

docker volume create portainer_data

Run the portainer as a contatiner on the bridge network

docker run -d -p 8000:8000 -p 9443:9443 --name portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:2.21.5

Sample docker-compose

---
services:
  portainer:
    image: portainer/portainer:latest
    container_name: portainer
    environment:
      - PUID = ${UID}
      - PGID = ${GID}
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - ${DATA}:/data
    ports:
      - 8000:8000
      # - 9000:9000 #HTTP port
      - 9443:9443 #HTTPS port
    restart: always

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Dockerfile

Common tags:

• FROM --> Base image
• COPY --> Commands to run
• WORKDIR --> current working dir in the container
• EXPOSE --> expose the mentioned port
• CMD --> run the final service (should not have a terminatig shell)

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Docker Compose

Common paramaters:

- service
  - [service-name]
    - image: [image_name]
    - container_name: [any_name_for_container]
    - hostname: [hostname]
    - user: [GID]:[UID]
    # - env_file:
    #   - [.env_location]
    - environment:
      - [parameter]=[value]
    - volumes:
      - [host_location]\:[container_location]
    - ports:
      - [host_port]\:[container_port]
    - restart: [always, unless-stopped, ....]

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Sources

1. https://docs.docker.com/
2. https://dockerlabs.collabnix.com/
3. https://www.docker.com/blog/
4. https://docs.portainer.io/