DOCKER CHIT-CHAT Davide Academy Pills 

2 AGENDA ● Docker? ● docker vs docker-compose ● Useful commands ● Q&A 

DOCKER IS NOT A VM ● Virtualize software, not hardware ● It’s faster! At least mom told my so... ● It’s Schrödinger simple 

IMAGES vs CONTAINERS ● An image is a template, containing a series of instruction ● A container is the executable instance, result such instructions IMAGE CONTAINER CONTAINER CONTAINER 

IMAGES vs CONTAINERS ● An image is a template, containing a series of instruction ● A container is the executable instance, result such instructions ● Images can be extended BASE_IMAGE IMAGE_ONE IMAGE_TWO FROM utnaf/BASE_IMAGE FROM utnaf/IMAGE_ONE 

HOW TO DOCKER IMAGE? 

HOW TO DOCKERFILE? https://github.com/utnaf/practical-docker 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image Set the base workdir 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image Set the base workdir Copy the files for dependencies installation 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image Set the base workdir Copy the files for dependencies installation Install dependencies 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image Set the base workdir Copy the files for dependencies installation Install dependencies Copy the rest of the files 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image Set the base workdir Copy the files for dependencies installation Install dependencies Copy the rest of the files Expose the port that the app is listening to 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image Set the base workdir Copy the files for dependencies installation Install dependencies Copy the rest of the files Expose the port that the app is listening to Entrypoint command 

HOW TO DOCKERFILE? FROM node:14.15.0 WORKDIR /var/www COPY package*.json ./ RUN npm install COPY . ./ EXPOSE 3000 CMD ["npm", "start"] Starting image Set the base workdir Copy the files for dependencies installation Install dependencies Copy the rest of the files Expose the port that the app is listening to Entrypoint command docker build --tag my-image:1.0.0 . docker run -p "3000:3000" my-image:1.0.0 

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docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j \ -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j \ -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j \ -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j \ -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

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DOCKER COMPOSE TO THE RESCUE ● Tool for multi-container application ● YAML based ● Single command ● Works in all environments: dev, prod, CI, etc... 

DOCKER COMPOSE TO THE RESCUE version: "2" services: frontend: image: my-image:1.0.0 networks: - myApp neo4j: image: neo4j:4.2 networks: - myApp ports: - 7474:7474 - 7687:7687 environment: - NEO4J_AUTH=neo4j/password - NEO4JLABS_PLUGINS=["apoc","graph-data-science"] volumes: - neo4j:/data networks: myApp: volumes: neo4j: 

DOCKER COMPOSE TO THE RESCUE version: "2" services: frontend: image: my-image:1.0.0 networks: - myApp neo4j: image: neo4j:4.2 networks: - myApp ports: - 7474:7474 - 7687:7687 environment: - NEO4J_AUTH=neo4j/password - NEO4JLABS_PLUGINS=["apoc","graph-data-science"] volumes: - neo4j:/data networks: myApp: volumes: neo4j: docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 

DOCKER COMPOSE TO THE RESCUE docker run -d --network myApp --name frontend my-image:1.0.0 docker run -d --name neo4j -p "7474:7474" -p "7687:7687" \ -e NEO4J_AUTH='neo4j/password' \ -e NEO4JLABS_PLUGINS='["apoc","graph-data-science"]' \ -v 'neo4j-data:/data' \ --network myApp \ neo4j:4.2 docker-compose up -d 

IMAGE Dockerfile docker build . docker run [IMAGE] CONTAINER CONTAINER CONTAINER CONTAINER docker-compose.yml docker-compose up 

Relax Time + Questions 

34 USEFUL COMMANDS 

DOCKER # build the image from the given dockerfile docker build . docker build -t [image_name]:[version] # tag the image docker build -t [username]/[image_name]:[version] # add a DockerHub repository # run the image docker run [...options] [image_name]:[version] # DockerHub commands docker login docker push [username]/[image_name] docker pull [username]/[image_name] 

DOCKER HUB 

DOCKER HUB docker push utnaf/myApp docker pull utnaf/myApp docker pull utnaf/myApp docker pull utnaf/myApp docker pull utnaf/myApp docker pull utnaf/myApp 

PROS ● Docker-based deploy ● Avoid passing the Dockerfile around ● Avoid building the image on every machine ● Has webhooks 

DOCKER COMPOSE # start and stop the containers docker-compose up docker-compose up -d # start the container in detached mode docker-compose stop # stop the containers docker-compose down # stop **and remove** the containers # debug containers docker-compose logs # print the last logs docker-compose logs -f # print logs in follow mode docker-compose logs [container] # print the logs of the specified container docker-compose exec [container] [command] # run the command in the container docker-compose exec myApp bash # enter a bash session on the myApp container docker-compose ps # show the current status of the containers 

DOCKER COMPOSE # start and stop the containers docker-compose up docker-compose up -d # start the container in detached mode docker-compose stop # stop the containers docker-compose down # stop **and remove** the containers # debug containers docker-compose logs # print the last logs docker-compose logs -f # print logs in follow mode docker-compose logs [container] # print the logs of the specified container docker-compose exec [container] [command] # run the command in the container docker-compose exec myApp bash # enter a bash session on the myApp container docker-compose ps # show the current status of the containers Available on docker command as well 

Questions? 

THANKS FOR YOUR ATTENTION Davide