(Hey... Chapter 1 is here)
Honestly, I don’t want to clone all Kubernetes Documentation into here 😂, I just wanted to share my fun experiences when I was playing with it. So please don’t forget to check the official documentations if you have some doubts.
Alright, let’s talk about our project:
We have a terribly simple project, a PHP file which output PHP’s info:
We’d like to deploy it into our servers: we have 2 servers running whatever-linux-distro-let’s-say-Ubuntu-18-LTS.
Our dream-dev-team is using PHP like this: One uses PHP 5 (don’t worry, he is our key person for 100 years), someone uses PHP 7.1/7.2/7.3/7.4,.. Ah, they are also using different OS… your best dream team ever 🤣
Marketing team planned a big launch event, expecting 1 million people will visit our website (well, to see our PHP’s info). So we’d like to have a load balancer, but really, nobody knows how many minions we should put – wait, we don’t want to bring up 100 minions running in the midnight to serve nobody.
Sometime, for some funny reason,
phpinfo() just crashed php-fpm, and your testers were seeing some not-so-nice 5xx error from nginx.
What we’re gonna do? Just put the file, config nginx, php-fpm, spin up a load balancer, and pray? Well, Hell NO
Let’s start everything with development. Everyone, please download and install Docker – Your new friend to make it easier to create, run, and deploy applications by using container!
I don’t care about your OS, your PHP installation, we’re gonna work with the same environment as we have on production: PHP-FPM 7.4
While our devs are busy downloading & installing their new friend Docker, let’s init the repository:
Project | |-- Dockerfile |-- src |-- index.php
Dockerfile is a definition for your container, where you create the environment for your application.
FROM php:7.4-fpm RUN mkdir /app WORKDIR /app COPY src .
Pretty simple huh?
- Line 1) My environment is based on php:7.4-fpm – a PHP official Docker image version 7.4 with PHP-FPM. Means you’re gonna create an environment which has PHP-FPM 7.4, perfect.
- Line 2) I create a new directory called /app – where I’m gonna put my application.
- Line 3) I want to set the current working directory to /app. So everything I’m gonna do from now is for the directory /app.
- Line 4) Finally I want to put our codebase (which is located under directory src inside the repo) into the working directory. Done!
Just that, with 4 lines, you defined the environment for your devteam and also for our production server.
Let’s wait for the devteam finishes and pushes their codebase into the repo:
Ok, we’re ready to run. First of all, we need to package our application codebase along with our environment:
$ docker build -t funny-project .
You just built your first ever Docker image, which contains the codebase, and PHP-FPM 7.4.
Let’s verify it
$ docker images -a REPOSITORY TAG SIZE funny-project latest 405MB
A 405MB image is registered on your Docker. Let’s try to run it:
$ docker run -p 9000:9000 funny-project
It will spin up a new Container, based on funny-project image, expose port 9000 from its environment to outside.
You can test it by a fcgi tool (You'd need to install cgi-fcgi)
$ SCRIPT_FILENAME=index.php REQUEST_METHOD=GET cgi-fcgi -bind -connect localhost:9000 | grep ">PHP Version <"
It works! You’re having a working container, which is ready to be deployed.
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