A presentation at ISTAcon in in Sofia, Bulgaria by Petyo Dimitrov
Achieving Continuous Delivery with Docker for Java Enterprise applications Petyo Dimitrov | Musala Soft JSC 18-19 November, Sofia
Agenda • • • • • • • 2/38 A typical Enterprise Java landscape Continuous Delivery pipeline Identified problems What are Docker containers? Docker “ecosystem” Demo Tips & Tricks 18-19 November, Sofia
Dev landscape for Java EE applications 3/38 18-19 November, Sofia
Continuous Delivery pipeline 4/38 18-19 November, Sofia
potential issues 5/38 18-19 November, Sofia
inadequate packaging of application artifacts 6/38 18-19 November, Sofia
inconsistencies across environments 7/38 18-19 November, Sofia
high cost supporting multiple static environments 8/38 18-19 November, Sofia
lack of freedom experimenting with new languages, technologies and frameworks 9/38 18-19 November, Sofia
how can docker containers help? 10/38 wait…what… containers? 18-19 November, Sofia
getting sea sick here!!! 11/38 18-19 November, Sofia
sea-free analogy 12/38 18-19 November, Sofia
High level view of a container • it is like a lightweight Virtual Machine • it provides: • own process space • own network interface • running stuff as root 13/38 18-19 November, Sofia
Low level view of a container • container = “process in a box” • shares kernel with host boots faster • processes run directly on the host • there is no device emulation • none or little CPU, memory, network and I/O overhead 14/38 18-19 November, Sofia
Virtual machines vs Containers 15/38 18-19 November, Sofia .
How does it work? – Isolation • isolation via namespaces • pid, mnt, net, uts, user, ipc • isolation via control groups • memory, cpu, blkio, devices 16/38 18-19 November, Sofia
How does it work? – Storage • union file system (aufs, overlayfs) • allows reusing common layers • reduces traffic and storage • allows tracking changes • copy-on-write pattern used for speed 17/38 18-19 November, Sofia
Developers Operations • care about apps • care about containers • put stuff in containers • work with containers • code & data • logging & monitoring • libraries • networking • applications • scaling 18/38 18-19 November, Sofia
docker “ecosystem” 19/38 18-19 November, Sofia
Client-Server model 20/38 18-19 November, Sofia
Docker engine • runs and commoditizes Linux containers • uses copy-on-write for quick provisioning • runs as daemon and has CLI • allows building and sharing images • functionality is exposed via REST API • defines standard format for containers 21/38 18-19 November, Sofia
Docker commands • ~40 commands • for working with: • images • containers • registry 22/38 18-19 November, Sofia
Dockerfile-s FROM jenkins:1.625.1 MAINTAINER Petyo Dimitrov ENV REFRESHED_AT 2015-10-24 RUN curl -L https://github.com/… > /usr/local/bin/docker-compose && chmod +x /usr/local/bin/docker-compose RUN mkdir /var/cache/jenkins RUN chown -R jenkins:jenkins /var/cache/jenkins docker build –t myjenkins .
COPY plugins.txt /plugins.txt RUN /usr/local/bin/plugins.sh /plugins.txt 23/38 18-19 November, Sofia
Docker Hub/Registry • collection of ready-made images • options: • public/private registry • local registry • REST API for access 24/38 18-19 November, Sofia
But how to build a stack of containers? 25/38 18-19 November, Sofia
Docker Compose • manages a collection of containers • fast, isolated development environments using Docker • define environment via YAML file • quick and easy to start docker-compose up –d 26/38 18-19 November, Sofia
YAML example 27/38 18-19 November, Sofia
How can I quickly provision a Docker host? 28/38 18-19 November, Sofia
Docker Machine • allows creating Docker hosts on local computer or in cloud providers • automatically creates host, installs Docker and configures the client • offers commands to start, stop, restart and inspect a host docker-machine create —driver virtualbox default 29/38 18-19 November, Sofia
Docker Summary • put my software in containers • run those containers anywhere • write recipes to automatically build containers 30/38 18-19 November, Sofia
Demonstration https://github.com/petyodimitrov/spring-music.git https://github.com/petyodimitrov/app-setup.git https://github.com/petyodimitrov/ci-setup.git 31/38 18-19 November, Sofia
Standard Java application build 2 1 32/38 18-19 November, Sofia
Adding docker images build 4 1 2 33/38 3 5 18-19 November, Sofia
Runtime view of containers 34/38 18-19 November, Sofia
Demonstration 35/38 18-19 November, Sofia
36/38 18-19 November, Sofia
Tips & Tricks • • • • • 37/38 single process per container security considerations use data containers for portability consider reducing image sizes etc… 18-19 November, Sofia
Thank you! petyo.dimitrov@gmail.com Petyo Dimitrov | Musala Soft JSC 18-19 November, Sofia
The interest in Docker and container technologies, in general, has skyrocketed in the last two years. It is seen by many as the next step in Continuous Delivery (CD), making it faster, more predictable, and more secure. In this presentation, we would explore how Docker can be used for Continuous Delivery. First, we would examine a “standard” Java Enterprise landscape using Jenkins, Maven, Nexus, etc, and use it to highlight issues that I and my team have experienced in our current project. Afterward, we would take a deeper look at Docker containers and showcase how they can improve upon our process. A demonstration of the “dockerized” solution would be presented to support the discussed topics.
for free. You
can too.