Docker

Links:

• More: https://github.com/hexops/dockerfile
• Many Images: https://hub.docker.com/u/linuxserver/
• how-to-clean-text-data-at-the-command-line https://www.ezzeddinabdullah.com/posts/how-to-clean-text-data-at-the-command-line

Basics

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Network issues on Windows

Network issues on Windows with Docker for Windows:

Show IP address allocated by the docker host: docker inspect -f "{{ .NetworkSettings.IPAddress }}" <docker-name>

Required port is reserved

• Check, if your required port is reserved: netsh interface ipv4 show excludedportrange protocol=tcp
• If it your port is in one of the ranges, stop winnat: net stop winnat
• Do stuff that didn't work before
• Prohibit dynamic reservation for your required port (here for example, 50051, as stated in the original question): netsh int ipv4 add excludedportrange protocol=tcp startport=50051 numberofports=1 Restart winnat: net start winnat

Stop IIS:

• Stop IIS: iisreset /STOP

Activate Docker in WSL2

Make sure WSL is installed and ready:

dism.exe /online /enable-feature /featurename:Microsoft-Windows-Subsystem-Linux /all /norestart
dism.exe /online /enable-feature /featurename:VirtualMachinePlatform /all /norestart

wsl --install
wsl --set-default-version 2

wsl --install Ubuntu
wsl --set-version Ubuntu 2

run this in Ubuntu WSL

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common libssl-dev libffi-dev git wget nano

sudo groupadd docker
sudo usermod -aG docker ${USER}

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update

sudo apt-get install -y docker-ce containerd.io docker-compose
sudo update-alternatives --config iptables

Add this to your ~/.profile

if grep -q "microsoft" /proc/version > /dev/null 2>&1; then
    if service docker status 2>&1 | grep -q "is not running"; then
        wsl.exe --distribution "${WSL_DISTRO_NAME}" --user root \
            --exec /usr/sbin/service docker start > /dev/null 2>&1
    fi
fi

Test Docker in your Ubuntu WSL:

docker run hello-world

In case this didn't work try to restart wsl and try again

wsl --shutdown

To communicate containers don't use localhost, point to: [ubuntu terminal]. This is usually the first IP that appears when running this command:

ip addr | grep eth0 | grep inet

To ensure docker service is running on startup to workaround having to deal with sudo

wsl.exe -u root service docker status || wsl.exe -u root service docker start

To limit ressources create a file in the user's folder C:\Users\<User>\.wslconfig and add the following information.

[wsl2]
memory = 4GB # Limits memory
processors = 2 # Limits virtual processors

Save and restart the LxssManager service.

Install Docker & Docker-compose on Ubuntu

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common libssl-dev libffi-dev git wget nano
sudo groupadd docker
sudo usermod -aG docker ${USER}
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get install -y docker-ce containerd.io docker-compose
sudo update-alternatives --config iptables # select iptables-legacy

Restart WSL to make sure changes apply.

Test if docker is running with sudo service docker status; if not start docker with sudo service docker start. Now run a hello-world container to see if docker is working: sudo docker run hello-world.

Settings

Run docker on startup

wsl.exe -u root service docker status || wsl.exe -u root service docker start

Start docker service

sudo service docker start

To limit the resources of your WSL:

• Enter the user's folder. C:\Users\USER
• Create the file: .wslconfig

• Enter the following:

  txt [wsl2] memory = 2GB processors = 1

• Save and restart the LxssManager service

Maintainance

Search through all images to find and delete the ones without active references. The -a tag will keep images that are tagged but not in use. (see Docs for more)

docker image prune -a --volumes

Images available locally:

docker image ls

Remove a specific image:

docker image rm IMAGEID

Storage used by images locally:

sudo du -sh /var/lib/docker/

To also remove all stopped containers run:

docker container prune

And run docker image prune -a if you want to remove all images linked to stopped containers.

Stop all the containers

docker stop $(docker ps -a -q)

Remove all the containers

docker rm $(docker ps -a -q)

Create Docker Compose Container

Example docker compose file

FROM nginx
COPY . /usr/share/nginx/html

Build: docker build -t img-static-site-example .
Run: docker run -it -d -p 80:80 img-static-site-example

docker-compose.yml

version: '3'
services:
  web:
    image: img-static-site-example
    build: .
    container_name: my-static-site
    restart: always
    ports:
      - "8080:80"

Build Container(s)

docker-compose build

Run Container(s)

docker-compose up -d

Container

A list with some cool containerized applications:

More examples:

• Trigger script in Powershell in Docker: docker run -it -v C:\Users\username\src:/src mcr.microsoft.com/azure-powershell:3.6.1-ubuntu-18.04 pwsh -file /src/script.ps1
• Webtop reset password: docker exec -it webtop passwd supers3cure

NoteCalc

git clone https://github.com/bbodi/notecalc3.git
cd notecalc3
docker build . --tag notecalc3
docker run --rm -d -p 5000:5000 notecalc3