Embed Size (px)
Citation preview
BEYOND VIRTUALIZATION!
CORE IDEAS
Containers vs virtual machines
What is docker?
Docker architecture
docker jargonImage:
A Docker image is a read-only template. For example, an image could contain an Ubuntu operating system with Apache and your web application installed. Images are used to create Docker containers.
docker jargonContainer:
A Docker container holds everything that is needed for an application to run. Each container is created from a Docker image. Docker containers can be run, started, stopped, moved, and deleted. Each container is an isolated and secure application platform.
docker jargonRegistry:
Docker registries hold images. These are public or private stores from which you upload or download images.
Default registry -> https://hub.docker.com/
Installing DOCKER
Docker is supported in a broad range of OS.
https://docs.docker.com/installation/
show me the code
listing my local images
> docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
listing my running containers
> docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
starting our very first container
> docker run ubuntu:14.04 /bin/echo 'Hello world'
Hello world
starting our very first container
> docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZEubuntu 14.04 91e54dfb1179 6 weeks ago 188.4 MB
starting our very first container
> docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
second try. Interactive containers
> docker run -t -i ubuntu:14.04 /bin/bash
root@433bacbdbcb7:/#
Lucky third. application containers
> docker run -d -P training/webapp python app.py
2e32450e554a9f969af74e955b0639ea988436b14983dd26802800143ac8
Lucky third. application containers
> docker run -d -P training/webapp python app.py
2e32450e554a9f969af74e955b0639ea988436b14983dd26802800143ac8
Lucky third. application containers
> docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES2e32450e554a training/webapp "python app.py" 7 minutes ago Up 7 minutes 0.0.0.0:32772->5000/tcp hungry_khorana
building images
A SIMPLE DOCKERFILEFROM centos:6.7MAINTAINER Javier Lopez <[email protected]>
EXPOSE 9324
ADD https://s3-eu-west-1.amazonaws.com/elasticmq-server-0.8.11.jar /usr/share/elasticmq-server-0.8.11.jarRUN yum install -y java-1.7.0-openjdk
CMD ["java", "-jar", "/usr/share/elasticmq-server-0.8.11.jar"]
available instructions
ENV
ADD
COPY
WORKDIR
EXPOSE
VOLUME
USER
COPY
ENTRYPOINT
MAINTAINER
CMD
FROM
creating an image
> docker build -t rightster/elasticmq:0.8.11 .
publishing our image
> docker login
> docker push rightster/elasticmq:0.8.11 .
Create an account at http://hub.docker.com
more than one container
LINKING CONTAINERS> docker run -d
--name my-db
-e MYSQL_ROOT_PASSWORD=my-secret-pw
mysql:5.5
> docker run -d -p 80
--name phpmyadmin
--link my-db:mysql
-e MYSQL_USERNAME=root
corbinu/docker-phpmyadmin
docker composemysql: image: mysql:5.5 environment: - MYSQL_ROOT_PASSWORD=my-secret-pwphpmyadmin: image: corbinu/docker-phpmyadmin environment: - MYSQL_USERNAME=root links: - mysql expose: - "80"
docker-compose.yml
docker compose
> docker-compose up
more than a few containers
quick overview of kubernetes
