Docker - Demo on PHP Application deployment
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The document provides an overview of Docker and its application in deploying a PHP application, including the benefits of using Docker containers, such as portability, isolation, and reduced overhead compared to virtual machines. It outlines the basic components of the Docker system, the process for building and running a Docker image for a PHP application, and concludes with a demo on how to deploy using a specific Dockerfile. The author emphasizes the efficiency of Docker in managing development and operations workflows.
![Demo explained
Dockerfile
# Set the base image to Ubuntu
FROM ubuntu ï Base image
RUN apt-get update
# File Author / Maintainer
MAINTAINER Example Arun
RUN apt-get install apache2 ây ï Installed Apache
# Copy the configuration files from host
ADD apache2files/apache2.conf /etc/apache2/apache2.conf ï Configuration files are copied during image build
ADD apache2files/ports.conf /etc/apache2/ports.conf
# Expose the default port
EXPOSE 80
#CMD ["/usr/sbin/apache2", "-D", "FOREGROUND"] ï These lines are not working, when new instance starts, cant start apache
#CMD service apache2 start
RUN echo 'service apache2 start ' > /etc/bash.bashrc ï Hence I started apache this way ,
# Set default container command
#ENTRYPOINT /bin/bash](https://image.slidesharecdn.com/arun-docker-140423085912-phpapp01/85/Docker-Demo-on-PHP-Application-deployment-15-320.jpg)
Docker - Demo on PHP Application deployment
- 1. Introduction to Docker Demo on PHP Application deployment Arun prasath S April, 2014
- 2. Static website Web frontend User DB Queue Analytics DB Background workers API endpoint nginx 1.5 + modsecurity + openssl + bootstrap 2 postgresql + pgv8 + v8 hadoop + hive + thrift + OpenJDK Ruby + Rails + sass + Unicorn Redis + redis-sentinel Python 3.0 + celery + pyredis + libcurl + ffmpeg + libopencv + nodejs + phantomjs Python 2.7 + Flask + pyredis + celery + psycopg + postgresql-client Development VM QA server Public Cloud Disaster recovery Contributorâs laptop Production Servers The ChallengeMultiplicityofStacksMultiplicityof hardware environments Production Cluster Customer Data Center Doservicesandapps interact appropriately? CanImigrate smoothlyand quickly?
- 3. Static website Web frontendUser DB Queue Analytics DB Development VM QA server Public Cloud Contributorâs laptop Docker is a shipping container system for codeMultiplicityofStacks Multiplicityof hardware environments Production Cluster Customer Data Center Doservicesandapps interact appropriately? CanImigrate smoothlyandquickly âŠthat can be manipulated using standard operations and run consistently on virtually any hardware platform An engine that enables any payload to be encapsulated as a lightweight, portable, self- sufficient containerâŠ
- 4. Why Developers Care Build onceâŠ(finally) run anywhere* âą A clean, safe, hygienic and portable runtime environment for your app. âą No worries about missing dependencies, packages and other pain points during subsequent deployments. âą Run each app in its own isolated container, so you can run various versions of libraries and other dependencies for each app without worrying âą Automate testing, integration, packagingâŠanything you can script âą Reduce/eliminate concerns about compatibility on different platforms, either your own or your customers. âą Cheap, zero-penalty containers to deploy services? A VM without the overhead of a VM? Instant replay and reset of image snapshots? Thatâs the power of Docker
- 5. Why Devops Cares? Configure onceâŠrun anything âą Make the entire lifecycle more efficient, consistent, and repeatable âą Increase the quality of code produced by developers. âą Eliminate inconsistencies between development, test, production, and customer environments âą Support segregation of duties âą Significantly improves the speed and reliability of continuous deployment and continuous integration systems âą Because the containers are so lightweight, address significant performance, costs, deployment, and portability issues normally associated with VMs
- 6. Underlying Technology âą Namespaces (pid, net, ipc, mnt, uts) âą Control group âą UnionFS Containers
- 7. App A Containers vs. VMs Hypervisor (Type 2) Host OS Server Guest OS Bins/ Libs App Aâ Guest OS Bins/ Libs App B Guest OS Bins/ Libs AppAâ Docker Host OS Server Bins/Libs AppA Bins/Libs AppB AppBâ AppBâ AppBâ VM Container Containers are isolated, but share OS and, where appropriate, bins/libraries Guest OS Guest OS âŠresult is significantly faster deployment, much less overhead, easier migration, faster restart
- 8. Why are Docker containers lightweight? Bins/ Libs App A Original App (No OS to take up space, resources, or require restart) AppÎ Bins/ App A Bins/ Libs App Aâ Guest OS Bins/ Libs Modified App Union file system allows us to only save the diffs Between container A and container Aâ VMs Every app, every copy of an app, and every slight modification of the app requires a new virtual server App A Guest OS Bins/ Libs Copy of App No OS. Can Share bins/libs App A Guest OS Guest OS VMs Containers
- 9. What are the basics of the Docker system? Source Code Repository Dockerfile For A Docker Engine Docker Container Image Registry Build Docker Host 2 OS (Linux) ContainerA ContainerB ContainerC ContainerA Push Search Pull Run Host 1 OS (Linux)
- 10. Why containers matter Physical Containers Docker Content Agnostic The same container can hold almost any type of cargo Can encapsulate any payload and its dependencies Hardware Agnostic Standard shape and interface allow same container to move from ship to train to semi-truck to warehouse to crane without being modified or opened Using operating system primitives (e.g. LXC) can run consistently on virtually any hardwareâVMs, bare metal, openstack, public IAAS, etc.âwithout modification Content Isolation and Interaction No worry about anvils crushing bananas. Containers can be stacked and shipped together Resource, network, and content isolation. Avoids dependency hell Automation Standard interfaces make it easy to automate loading, unloading, moving, etc. Standard operations to run, start, stop, commit, search, etc. Perfect for devops: CI, CD, autoscaling, hybrid clouds Highly efficient No opening or modification, quick to move between waypoints Lightweight, virtually no perf or start-up penalty, quick to move and manipulate Separation of duties Shipper worries about inside of box, carrier worries about outside of box Developer worries about code. Ops worries about infrastructure.
- 11. Usecases
- 12. Demo â PHP application deployment In this demo, I will show how to build a apache image from a Dockerfile and deploy a PHP application which is present in an external folder using custom configuration files. Requirements: Linux OS with Docker installed
- 13. Demo quick run : 1) Download this folder or files from Git - https://github.com/bingoarunprasath/php-app-docker.git 2) Now build a image for app deployment. From the folder downloaded, run the command docker build -t bingoarunprasath/php . 3) Run the image by this command docker run -i -t -d -p 80 -v /root/php-app/www:/var/www bingoarunprasath/php /bin/bash 4) You can run as many instances you want by running the above command 5) Run docker ps command to see the launched container. Note down the port number. (in my case 49172) 6) Now you can see your web application by visiting http://<your-host-ip>:49172 or http://<your-container-ip>:80 (You can view your container ID by docker ps and can view your container IP by docker inspect <container-ID>)
- 14. Demo explained Folder structure php-app |______apache2files------apache2.conf | |___ports.conf -> Apache configuration files | |______Dockerfile -> Docker file for building image | |______www/ -> PHP Application folder
- 15. Demo explained Dockerfile # Set the base image to Ubuntu FROM ubuntu ï Base image RUN apt-get update # File Author / Maintainer MAINTAINER Example Arun RUN apt-get install apache2 ây ï Installed Apache # Copy the configuration files from host ADD apache2files/apache2.conf /etc/apache2/apache2.conf ï Configuration files are copied during image build ADD apache2files/ports.conf /etc/apache2/ports.conf # Expose the default port EXPOSE 80 #CMD ["/usr/sbin/apache2", "-D", "FOREGROUND"] ï These lines are not working, when new instance starts, cant start apache #CMD service apache2 start RUN echo 'service apache2 start ' > /etc/bash.bashrc ï Hence I started apache this way , # Set default container command #ENTRYPOINT /bin/bash
- 16. Demo explained Commands 1) Build image by using the Dockerfile in the current folder $ docker build -t bingoarunprasath/php-app . 2) Run an instance from image build $ docker run -i -t -d -p 80 -v /root/php-app/www:/var/www bingoarunprasath/php-app /bin/bash -v /root/php-app/www:/var/www ï PHP files are mounted during instance launch, Hence different apps can be mounted using the same image