This document provides an overview of Docker concepts and commands for building, running, and managing Docker containers. It demonstrates how to run a simple Node.js application as a Docker container using commands like docker run, docker build, docker ps, and docker-compose. It also shows how to link containers, mount folders, push images to Docker Hub, and remove containers.

1. Docker in Action
Simon Su @ Linker
https://goo.gl/q2ng7h

2. Prepare - start from a piece of code
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000 || process.env.PORT;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello Worldn');
});
server.listen(port, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});
Run it...
Test it...
web.js

3. docker

4. See the local images
docker images

5. Search from Docker Hub
docker search node

6. docker run ...
docker run -it node bash
docker run -d node
docker run -d node node web.js

7. Run process and mount a folder
docker run -v `pwd`/web.js:/web.js
-d node node web.js

8. Expose a port
docker run -it -p 3000:3000 node bash

9. Give it a name
docker run -d -p 5984:5984
--name db couchdb

10. Link with another container
docker run -it --link db:db node bash

11. Attach to running instance
docker attach $id

12. Attach to running instance with “exec”
docker exec -it $id bash

13. See your process...
docker ps
docker ps -q
docker ps -a
docker ps -a -q

14. Stop & Start
docker stop $id
docker start $id

15. Kill container(s)
docker rm $id
docker rm -f $id

16. Kill process more easy
docker rm -f `docker ps -q`
docker rm -f `docker ps -a -q`

17. A complex start command
docker run -d -p 5984:5984 --name db couchdb
docker run -d --restart=always -l webserver
--name webserver
--link db:db
-v `pwd`/web.js:/app/web.js
-p 80:3000
-e PORT=3000
-w /app
node node web.js

18. FROM node
RUN apt-get update -y && apt-get install curl -y
ADD /app /app
WORKDIR /app
CMD ["node","web.js"]
Dockerfile

19. Build the Dockerfile
docker build -t devops-node .

20. Run the new image
docker run -d -p 80:3000 devops-node
Test it… curl localhost

21. Push to Docker Hub
docker build -t myname/devops-node .
docker push myname/devops-node

22. Image maintain
docker rmi myname/devops-node

23. docker-compose

24. couchdb:
restart: always
image: couchdb
container_name: couchdb
volumes:
- /data/couchdb:/usr/local/var/lib/couchdb
environment:
- COUCHDB_USER=admin
- COUCHDB_PASSWORD=12345678
ports:
- "5984:5984"
webserver:
restart: always
image: devops-node
container_name: webserver
environment:
- PORT=3000
links:
- couchdb:couchdb
ports:
- "3000:3000"
Web Server
CouchDB
Port: 5984
Port: 3000
docker-compose.yml

25. Run default compose
docker-compose up
docker-compose up -d

26. Run single instance in compose file
docker-compose up -d couchdb

27. Check process
docker-compose ps
docker-compose -f file.yml ps

28. Delete compose process
docker-compose down
docker-compose -f file.yml down
docker-compose down couchdb

29. Something in advance...
● Docker swarm
● Kubernetes
● DCOS
● Monitoring

30. 想學Swarm… 可以參考Evan大大的文章
http://www.evanlin.com/til-2016-07-13/