services: web: image: nginx:latest ports: - "8080:80" command: >- bash -c "COLORS=('red' 'green' 'blue' 'yellow' 'cyan' 'magenta' 'orange' 'purple' 'pink' 'lime' 'teal' 'brown' 'gold' 'navy' 'olive' 'maroon' 'aqua' 'coral' 'salmon' 'violet'); COLOR=$${COLORS[$$RANDOM % $${#COLORS[@]}]}; echo \"

Mi color de fondo es $$COLOR

\" > /usr/share/nginx/html/index.html && nginx -g 'daemon off;'"