How to use Docker and migrate your existing Apps? We will cover all the cool advantages of containerization, and how to easily migrate and manage your existing services and apps into Docker Containers on your Linux Server!
We will use the free and open-source software Docker.
Project Homepage: https://www.docker.com/ Documentation: https://docs.docker.com/
Video: https://youtu.be/y0GGQ2F2tvs
Prerequisites
- Linux Server running Ubuntu 20.04 LTS or newer
You can still install Docker on a Linux Server that is not running Ubuntu, however, this may require different commands!
1. Install Docker, and Docker-Compose
You can still install Docker on a Linux Server that is not running Ubuntu, however, this may require different commands!
1.1. Install Docker
sudo apt update
sudo apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
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 $(lsb_release -cs) stable"
sudo apt update
sudo apt-get install docker-ce docker-ce-cli containerd.io
1.2. Check if Docker is installed correctly
sudo docker run hello-world
1.3. Install Docker-Compose
Download the latest version (in this case it is 1.25.5, this may change whenever you read this tutorial!)
sudo curl -L "https://github.com/docker/compose/releases/download/1.25.5/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
1.4. Check if Docker-Compose is installed correctly
sudo docker-compose --version
1.5. (optional) Add your linux user to the docker
group
sudo usermod -aG docker $USER
2. Docker Basics
2.1. Run a Docker Container
docker run hello-world
2.2. How to find Docker Images?
To get new applications, just visit the official Docker Hub. Because most vendors and communities maintain their own images, you will find Images for many applications there.
2.3. Expose Ports
Run a simple NGINX webserver.
docker run -p 80:80 -d nginx
2.4. Persistent Volumes
docker run -p 80:80 -v nginx_data:/var/www/html -d nginx
2.5. Migrate static files to a Docker Volume
Migrate a NGINX webserver to Docker.
sudo systemctl stop nginx sudo systemctl disable nginx docker run -p 80:80 -v /var/www/html:/var/www/html -d nginx
2.6. Migrate databases to a Docker Volume
Migrate a MySQL Server to Docker.
sudo systemctl stop mysql-server sudo systemctl disable mysql-server docker run -v /var/lib/mysql:/var/lib/mysql -d mysql
3. Set up Portainer
3.1. Create a new Docker Volume
docker volume create portainer_data
3.2. Launch Portainer
docker run -d -p 8000:8000 -p 9000:9000 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce
Reference: videos/docker-tutorial at main · ChristianLempa/videos · GitHub
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