Que es Docker

Docker permite ejecutar aplicaciones en contenedores aislados. Ideal para correr multiples servicios en un solo VPS sin conflictos.

Instalar en Ubuntu

apt update
apt install ca-certificates curl gnupg -y
install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" > /etc/apt/sources.list.d/docker.list
apt update
apt install docker-ce docker-ce-cli containerd.io docker-compose-plugin -y
docker --version

Primer contenedor

docker run -d --name web -p 80:80 nginx
docker ps

Docker Compose - WordPress

# docker-compose.yml
version: "3.8"
services:
  db:
    image: mysql:8
    environment:
      MYSQL_ROOT_PASSWORD: secreto123
      MYSQL_DATABASE: wordpress
    volumes:
      - db_data:/var/lib/mysql
  wordpress:
    image: wordpress:latest
    ports:
      - "80:80"
    environment:
      WORDPRESS_DB_HOST: db
      WORDPRESS_DB_NAME: wordpress
      WORDPRESS_DB_PASSWORD: secreto123
volumes:
  db_data:
docker compose up -d