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# Inherit from the Node 4.2.2 image
FROM node:4.2.2
# Copy the server files
ADD . /app
# Install the node module
RUN cd /app && npm install
# Expose the default port
EXPOSE 3000
# Run base binary
ENTRYPOINT ["node", "bin/ldf-server"]
# Default command
CMD ["--help"]
> cat Dockerfile](https://image.slidesharecdn.com/dockerintro-161108060903/75/Docker-Intro-12-2048.jpg)
![Search the Docker hub, and download images to your local repo
Or use the command-line...
17
> docker search ubuntu
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
ubuntu Ubuntu is a Debian-based Linux operating s... 4958 [OK]
ubuntu-upstart Upstart is an event-based replacement for ... 67 [OK]
rastasheep/ubuntu-sshd Dockerized SSH service, built on top of of... 47 [OK]
> docker pull ubuntu
12.04: Pulling from library/ubuntu
ba2b457ecfb2: Pull complete
26180b0fe8fb: Pull complete
edd7c1974a70: Pull complete
57bca5139a13: Pull complete
library/ubuntu:12.04: The image you are pulling has been verified.
Status: Downloaded newer image for ubuntu:12.04](https://image.slidesharecdn.com/dockerintro-161108060903/75/Docker-Intro-17-2048.jpg)
Uploaded byRuben Taelman
Docker Intro
This document provides an introduction to Docker. It describes Docker as a platform for running software in isolated containers. It discusses how Docker allows running multiple software versions simultaneously and makes software easily installable and disposable. It covers Docker concepts like images, containers, Dockerfiles for building images, and running containers from images. It also discusses Docker networking, Docker Compose for defining multi-container apps, and tools for monitoring Docker performance and usage.
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Docker Intro
- 1. An Introduction toDocker 1 Ruben Taelman - @rubensworks imec - Ghent University
- 2. So what isDocker? Platform for running software in isolated containers 2
- 3. So what isDocker? Platform for running software in isolated containers 3 Traditional webserver NGINX PostgreSQL Node
- 4. So what isDocker? Platform for running software in isolated containers 4 Traditional webserver Docker webserver NGINX PostgreSQL Node NGINX PostgreSQL Node
- 5. So what isDocker? Platform for running software in isolated containers 5 Traditional webserver Docker webserver NGINX PostgreSQL Node NGINX PostgreSQL Node ✓Linux ✓Windows ✓Mac
- 6. (Reproducible) software evaluations Easilyinstallable and disposable software Running different software versions simultaneously What to use Docker for? 6
- 7.
- 8.
- 9. Virtual machines vscontainers (Docker) containers don’t need separate OS’s, so they are more lightweight. 9
- 10. Docker workflow 10 Dockerfile ImageContainer Build Run Description of an image Built image Available for reuse Instantiated image
- 11. Dockerfile Layered image descriptions 11 Debian NodeJS LDF server
- 12. 12 # Inherit fromthe Node 4.2.2 image FROM node:4.2.2 # Copy the server files ADD . /app # Install the node module RUN cd /app && npm install # Expose the default port EXPOSE 3000 # Run base binary ENTRYPOINT ["node", "bin/ldf-server"] # Default command CMD ["--help"] > cat Dockerfile
- 13. RUN Executed whenthe image is being built Zero or more RUN’s per Dockerfile Typically used for installing software Result will be stored in image CMD Executed when the image is being run/instantiated Only one CMD per Dockerfile Default command to run when starting the container Can be overridden by user ! Difference between RUN and CMD ! 13
- 14. Build image toyour local repository Building a Dockerfile to an image 14 > docker build -t <image-name> <path-to-dir>
- 15. All your availableimages Your local image repository 15 > docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE ldf-server latest db3a7fb38cb2 10 minutes ago 683.3 MB stuff latest do89d002jbsd 1 week ago 102.2 MB
- 16.
- 17. Search the Dockerhub, and download images to your local repo Or use the command-line... 17 > docker search ubuntu NAME DESCRIPTION STARS OFFICIAL AUTOMATED ubuntu Ubuntu is a Debian-based Linux operating s... 4958 [OK] ubuntu-upstart Upstart is an event-based replacement for ... 67 [OK] rastasheep/ubuntu-sshd Dockerized SSH service, built on top of of... 47 [OK] > docker pull ubuntu 12.04: Pulling from library/ubuntu ba2b457ecfb2: Pull complete 26180b0fe8fb: Pull complete edd7c1974a70: Pull complete 57bca5139a13: Pull complete library/ubuntu:12.04: The image you are pulling has been verified. Status: Downloaded newer image for ubuntu:12.04
- 18. Instantiate an image Runningan image 18 > docker run -it --rm ldf-server Important options: -i -t --rm -d -p 8080:80 -v /mydir:/targetdir ... Keep STDIN open Allocate new terminal Remove container after stopping (default: stopped state) Run in background Map host port to container port Map local directory to container directory
- 19. List running containers Listrunning + stopped containers Stop container Remove container List images Remove image Image and container management 19 docker ps docker ps -a docker stop <container-hash-or-name> docker rm <container-hash-or-name> docker images docker rmi <image-name>
- 20. Attach an image(not guaranteed to have a CLI) Using detached containers 20 > docker attach <container-hash> Open shell in container (useful for debugging) > docker exec -it <container-hash> /bin/bash CTRL+p CTRL+q to detach
- 21.
- 22. Connect microservices using virtualDocker networks 22 Docker webserver NGINX PostgreSQL Node
- 23. Managing networks 23 > dockernetwork ls NETWORK ID NAME DRIVER 7fca4eb8c647 bridge bridge 9f904ee27bf5 none null cf03ee007fb4 host host Default Dummy network Same as host network > docker network create --driver bridge <network-name> > docker network inspect <network-name> > docker run --network=<network-name> <image-name>
- 24. using Docker swarm Swarm Runningcontainers on multiple hosts 24 Manager Node 1Node 0 Node 2
- 25. Scale applications, byrunning containers N times Load balancing Automatic management Deploying applications in clusters 25
- 26. Scale applications, byrunning containers N times Load balancing Automatic management Deploying applications in clusters 26
- 27.
- 28. Docker Compose Declaratively definemulti-container applications in docker-compose.yml 28 > docker-compose up -d > docker-compose stop > docker-compose rm
- 29. 29 version: '2' services: server: image: linkeddatafragments/server.js ports: -"3000:3000" volumes: - ${DATA_DIR}:/data - ./config-server.json:/tmp/config.json command: /tmp/config.json 3000 ${LDF_WORKERS} server-cache: image: nginx:stable ports: - "80:80" volumes: - ./nginx-default:/etc/.../default:ro links: - server > cat docker-compose.yml
- 30. Docker Machine Install DockerEngine on any host Easily SSH to any host to control it 30
- 31. Methods for measuringCPU, memory usage, I/O … Third-party alternatives: Datadog, CAdvisor, Scout ... Monitoring 31 > docker stats CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O 1285939c1fd3 0.07% 796 KiB / 64 MiB 1.21% 788 B / 648 B 3.568 MB / 512 KB 9c76f7834ae2 0.07% 2.746 MiB / 64 MiB 4.29% 1.266 KB / 648 B 12.4 MB / 0 B d1ea048f04e4 0.03% 4.583 MiB / 64 MiB 6.30% 2.854 KB / 648 B 27.7 MB / 0 B
- 32.