Now Shall We

Docker, the new sheriff in town whose new gold boots is getting everyone excited. Why? because Docker is development bliss since it ensures consistency on both your development and production cycles therefore standardizing your environment

I assume you're as excited about docker as the rest of us and hence explains why you have stumbled upon this post. I'll be honest, docker at first, without any prior knowledge is a nightmare, as any other new concept without prior knowledge, but once you do get the hang of it, it'll save you tonnes of time you'll have otherwise invested during deployment.

This post is intended mostly for beginners who probably have little or no knowledge about docker. The motivation behind this post lies on the fact that I wasn't able to find any comprehensive Laravel Docker tutorials online. I was only able in the end to accomplish this task through continuous reading of multiple blog posts and combining all this into a massive comprehensive series of steps that I'll attempt to document in this post.

Now Onto The Good Stuff..

Before I start, I assume that you already have your Laravel Application ready with you. If you don't, you can jump on to the Laravel Documentation Page and build yourself an app, then head back here and continue reading.

I also assume that you already have Docker installed on your machine. In case you don't, you have the following options:

1. Windows 10 Pro Users: Docker Desktop
2. Windows 10 Version that's below Windows 10 Pro Users: Docker Toolbox .This is because of Docker Desktop system requirements. Docker Toolbox leverages on the functionalities of VirtualBox.
3. Linux Users: Docker CentOS . You can choose your Linux distribution (if its not CentOS) from the side menu on the screen that comes up and follow those distribution specific instructions.

First Step: Creating your 'docker-compose' file

What is a docker-compose file? This is a file that defines all your multiple docker containers and all these containers can be spawned up by running a relatively simple command like:

docker-compose -f docker-compose.prod.yml up --build

Here, we'll be setting up a development environment (Which can also be used in your production environment, with a few minor changes that I'll document in my next post :-))

Create a file in your root directory and name it: docker-compose.yml

You'll be defining the containers in the next steps in this file.

In our docker-compose file, we define three containers: mysql, nginx and our laravel app.

So, for starters, our laravel app container will be defined as follows:

version: '2'
services:
The Application
app:

container_name: laravel_app

build:

context: ./

dockerfile: development/app.dockerfile

volumes:

- ./storage:/var/www/storage

env_file: ‘.env.prod’

environment:

- “DB_HOST=database”

- “REDIS_HOST=cache”

Overview of the Above Code:

1. version - Feel free to change this to your choosing
2. container_name - You’ll use this name to refer to your container. i.e. if you’d want to close your container, you’ll use this name to refer to it specifically. Also feel free to change it to your choosing.
3. build - Used to build an image from a Dockerfile. Has the following additional options:

• Context - Docker uses this context (basically, where your laravel files reside) to reference any files within it. In this case, the ./ refers to the root laravel folder assuming that the docker-compose file is stored in your laravel root folder.
• dockerfile: docker images are built from Dockerfiles, which often contain additional commands that should be run inside the container. In this case, the dockerfile we use to build our appcontainer. Also note that we have used development/app.dockerfile .This means that our docker file is located in a ‘development’ folder on the root of our laravel app.

1. volumes - Volumes are used by docker containers to share files between the host machine and the docker container that is running. The left hand side of the full colon represents our host machine and the right hand side represents our docker container. In this case, we’re sharing all data in the storage folder on our laravel app with the docker container mounted at /var/www/storage
2. env_file - This defines our laravel’s .env file, in our case env.prod that we’ll use to input docker container specific environment variables as we’ll see later on this post.
3. environment - This defines the environment variables that will be set on our docker machine. In this case, if we can execute a bash command inside our linux container and reference the environment variables we define here, i.e. echo $DB_HOST will print out: database

Our NGINX Container will be defined as follows:

# The Web Server

web:

container_name: nginx_server

build:

context: ./

dockerfile: development/web.dockerfile

volumes:

- ./storage/logs/:/var/log/nginx

ports:

- 8990:80

Overview of the Above Code:

1. container_name - Again, the name of your container, which you can choose to change.
2. build - Definition same as above. Here you can see that we define this container’s dockerfile as web.dockerfile.
3. volumes - Definition same as above. Here we share our laravel’s logs folder with nginx’s logs folder.
4. ports - Here, we define the port in the host machine that our docker container will be listening on and the port on the virtual network created by docker during container deployment. This can be easily visualised by understanding that the left side of the colon defines the host machines, therefore ports on the host machine and the right side of the colon the docker container, therefore the ports on the docker container.

Our MySQL Container will be defined as follows:

# The Database

database:

container_name: mysql_database

image: mysql:5.7

volumes:

- dbdata:/var/lib/mysql

environment:

- “MYSQL_DATABASE=Baly”

- “MYSQL_USER=phpmyadmin”

- “MYSQL_PASSWORD=phpmyadmin”

- “MYSQL_ROOT_PASSWORD=finallyJDBC2017.”

ports:

- 8991:3306

Overview of the Above Code:

1. container_name - Refer to above.
2. image - In this case, we haven’t defined a dockerfile to base our container build on, but rather an image. Our docker container will therefore be built from the image we’ve defined in this case mysql5:7image. You can switch this mysql version with the version you’re developing with. Remember that, with reference to your laravel application, the newest versions of mysql may not work with your laravel app. This is because the newest versions MySQL use a different technique of authentication that may not be supported by either mysql or pdo php extensions. Therefore, beware when invoking mysql:latest instead of mysql:5.7.
3. volumes - Still the same concept, except that now we’ve defined dbdata from our host machine that will map to /var/lib/mysql on the docker container.
4. environment - Same concept as defined above, except that in this case, our mysql database will be initialized with the variables we have set. Therefore, our container after build, will automatically have a database named database , a user named secret identified by the password secret and a root password of secret_root. You can feel free to change these as you please. We define these settings in our env.prodfile so as not to collide our current .env file settings with our container file settings.
5. ports - same as above, except that our mysql container will be listening on port 8991 on the host machine and 3306 (mysql’s default port) on the container’s network.

Defining your named volumes

Copy paste the following into your docker-compose.yml file:

volumes:

dbdata:

Ensure that you need to preserve the indenting in your docker-compose.yml file to ensure that docker-compose reads it correctly. In the end, your docker-compose file should look as follows:

version: ‘2’

services:
The Application
app:

container_name: laravel_app

build:

context: ./

dockerfile: development/app.dockerfile

volumes:

- ./storage:/var/www/storage

env_file: ‘.env.prod’

environment:

- “DB_HOST=database”

- “REDIS_HOST=cache”
The Web Server
web:

container_name: nginx_server

build:

context: ./

dockerfile: development/web.dockerfile

volumes:

- ./storage/logs/:/var/log/nginx

ports:

- 8990:80
The Database
database:

container_name: mysql_database

image: mysql:5.7

volumes:

- dbdata:/var/lib/mysql

environment:

- “MYSQL_DATABASE=Baly”

- “MYSQL_USER=phpmyadmin”

- “MYSQL_PASSWORD=phpmyadmin”

- “MYSQL_ROOT_PASSWORD=finallyJDBC2017.”

ports:

- 8991:3306
# redis

cache:

image: redis:3.0-alpine
volumes:

dbdata:

Second Step: Defining our Dockerfiles.

In this step, we define the dockerfiles for the containers we just defined in our docker-compose file. These dockerfiles will represent a series of commands that we’ll want to run inside our docker containers.

Defining our ‘app’ dockerfile (laravel_app)

Create a folder in your laravel app’s root directory and name it development. Inside the folder you just created, create a file and name it app.dockerfile(yes, without any extensions). Open this file and copy paste the following code into it:

FROM php:7.2-fpm

COPY composer.lock composer.json /var/www/
COPY database /var/www/database
WORKDIR /var/www
RUN apt-get update && apt-get -y install git && apt-get -y install zip
RUN php -r “copy(‘https://getcomposer.org/installer’, ‘composer-setup.php’);” 

&& php -r “if (hash_file(‘SHA384’, ‘composer-setup.php’) === ‘a5c698ffe4b8e849a443b120cd5ba38043260d5c4023dbf93e1558871f1f07f58274fc6f4c93bcfd858c6bd0775cd8d1’) { echo ‘Installer verified’; } else { echo ‘Installer corrupt’; unlink(‘composer-setup.php’); } echo PHP_EOL;” 

&& php composer-setup.php 

&& php -r “unlink(‘composer-setup.php’);” 

&& php composer.phar install --no-dev --no-scripts 

&& rm composer.phar
COPY . /var/www
RUN chown -R www-data:www-data 

/var/www/storage 

/var/www/bootstrap/cache
RUN php artisan cache:clear
RUN php artisan optimize
RUN  apt-get install -y libmcrypt-dev 

libmagickwand-dev --no-install-recommends 

&& pecl install mcrypt-1.0.2 

&& docker-php-ext-install pdo_mysql 

&& docker-php-ext-enable mcrypt
RUN mv .env.prod .env
RUN php artisan optimize

Overview of the Above Code

1. From php:7.2-fpm - This means will be building our container from an image, php:7.2-fpm. Also, you can change this version to meet your development environment needs.
2. COPY - In the first copy command, we copy our composer.lock and composer.json from our root folder (in our host machine) to /var/www/ in the docker container. In the second copy command, we copy our database folder in the host machine to /var/www/databasefolder in the docker container. This is because, one, we’ll want to make sure that the dependencies we use in our development environment (in composer.json) will be reflected inside the container when we download dependencies and two, that we can access our migrate files inside the docker container in cases we may need to run migrate command.
3. WORKDIR - We set the working directory to /var/www which means we don’t have to cd to this folder (move to this folder) in cases we’ll need to run bash commands.
4. RUN - Here, we install all the dependencies that will be needed by laravel, including composer and the dependencies needed by composer. Please note the if(hash_file(‘SHA384’… line. The hash value defined there will change with every update, and therefore if your installer fails with the message: installer corrupt, consider getting the correct hash value from: Get Hash Value.
5. COPY . /var/www - At this point we copy all our folder contents into /var/www folder in the docker container.
6. RUN - In the final run commands, we clear our application cache and other cache and install the mysql driver that laravel uses to make connections to the database. Afterwards, we rename our .env.prodfile to .env since this file will contain the correct environment variables specific to the docker container environment and therefore should be used by laravel. We run php artisan optimize to remove the cached version of the .env file.

Please note that it is unnecessary to copy everything from our root folder (like vendor folder) and docker provides a .dockerignore file which works pretty much like a .gitignore file. Our dockeringore file will look as follows:

.git

.idea

.env

node_modules

vendor

storage/framework/cache/**

storage/framework/sessions/**

storage/framework/views/**

development

Save this file in the same folder as your app.dockerfile (development folder).

For your .env.prod file, copy paste your .env file and rename it to .env.prod. In the database settings, change the DB_HOST to match the name of your mysql container, and the password to match what you defined in your docker-compose.yml file. If you followed all my steps without changing a thing, then your .env.prod file should resemble the following:

DB_CONNECTION=mysql

DB_HOST=mysql_database

DB_PORT=3306

DB_DATABASE=Baly

DB_USERNAME=phpmyadmin

DB_PASSWORD=phpmyadmin

Defining our ‘web’ dockerfile

In the same folder you just created (the development folder) create a web.dockerfile. Copy paste the following to the dockerfile:

FROM nginx:1.10-alpine

ADD development/vhost.conf /etc/nginx/conf.d/default.conf
COPY public /var/www/public

Overview of the Above Code

We build our dockerfile from the image: nginx:1.10-alpine. We then replace nginx’s default.conf file with the vhost.conf we’ll create in a sec.

We also copy our laravel app’s public directory to the public directory of nginx, that will server all our public assets.

Create a vhost.conf file in this same directory (development) and copy paste this into it:

server {

listen 80;

index index.php index.html;

root /var/www/public;

access_log /var/log/nginx/access.log;

error_log /var/log/nginx/error.log;

location / {

try_files $uri /index.php?$args;

}

location ~ \.php$ {
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass app:9000;
    fastcgi_index index.php;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO $fastcgi_path_info;
}

}

our php-fpm container will be listening on port 9000 and hence app:9000

Almost there…

So, to counter-check, you need to already have the following files:

1. Root folder - docker-compose.yml and .env.prod
2. development folder:

• .dockerignore
• app.dockerfile
• web.dockerfile
• vhost.conf

If so, then you’re almost done, but first, some prerequisites:

If you are using Docker Toolbox on Windows and your laravel app folder is in a folder other than C:/users you will have trouble sharing volumes between your host machine and your docker containers. This is because any other folder that’s not C:/users is not mounted by virtual box when your docker machine starts. Therefore, to fix this, first stop your running docker machine by running:

docker-machine stop

Then open virtualbox, right-click the machine named default and click on settings . Navigate to Shared Folders click on it, and add a new folder that defines the location of your laravel app folder. Remember to check against Auto mount. Afterwards, start your docker machine by running:

docker-machine start default

Drum Rolls…

Assuming you have done everything correctly, go ahead and run the following command:

docker-compose up --build

Make sure that you are running this command inside the root folder of your laravel app. This command builds your container images and finally starts them. If everything goes according to plan, you should be able to access your laravel app running inside your container at:

0.0.0.0:8990

Replace 8990 with the port you defined in your docker-compose.yml file if you used a different port.

Also, please note that for users using Docker Toolbox, docker creates a virtual network and assigns an IP address to it. You can find this IP address by searching for docker quickstart terminal and running it. The IP address assigned will be displayed in the terminal that pops up and you’ll be able to access your laravel app by going to:

your-docker-machine-ip:8990

And there you have it folks! You have successfully deployed your laravel app on docker! Stay tuned for my next post where I’ll be describing on how to deploy your Laravel app on a production environment.

Thanks for reading. If you liked this post, share it with all of your programming buddies!

#laravel #docker #mysql #devops #web-development #php