Test and deploy Laravel applications with GitLab CI and Envoy

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+# Test and deploy Laravel applications with GitLab CI and Envoy
+
+> **Type:** tutorial ||
+> **Level:** intermediary ||
+> **Author:** [Mehran Rasulian](https://gitlab.com/mehranrasulian) ||
+> **Publication date:** 2017/06/14
+
+## Introduction
+
+GitLab features our applications with Continuous Integration, and it is possible to deploy the new code changes to the production server whenever we want just by clicking a button!
+
+In this tutorial, we'll show you how to initialize a [Laravel](http://laravel.com/) application and setup our [Envoy](laravel.com/docs/envoy) tasks, then we'll jump into see how to test and deploy it with [GitLab CI](/gitlab-ci/) via [Continuous Delivery](https://about.gitlab.com/2016/08/05/continuous-integration-delivery-and-deployment-with-gitlab/).
+
+We assume you have a basic experience with Laravel, Linux servers,
+and you know how to use GitLab.
+
+Laravel is a high quality web framework written in PHP.
+It has a great community with a [fantastic documentation](https://laravel.com/docs).
+Aside from the usual routing, controllers, requests, responses, views, and (blade) templates, out of the box Laravel provides plenty of additional services such as cache, events, localization, authentication and many others.
+
+We will use [Envoy](https://laravel.com/docs/master/envoy) as an SSH task runner which is based on PHP.
+It uses a clean, minimal [Blade syntax](https://laravel.com/docs/blade) to setup tasks that can run on remote servers.
+Those tasks can be cloning your project from the repository, installing the Composer dependencies, running [Artisan commands](https://laravel.com/docs/artisan) and more.
+
+## Initialize our Laravel app on GitLab
+
+We assume [you have installed a new laravel project](https://laravel.com/docs/installation#installation), so we start with writing a unit test, and initialize the git for the project.
+
+### Unit Test
+
+Every new installation of Laravel (currently 5.4) comes with two type of tests 'Feature' and 'Unit' placed in the tests directory.
+Here's a unit test from `test/Unit/ExampleTest.php`:
+
+```php
+<?php
+
+namespace Tests\Unit;
+
+...
+
+class ExampleTest extends TestCase
+{
+    public function testBasicTest()
+    {
+        $this->assertTrue(true);
+    }
+}
+```
+
+This test is as simple as asserting that the given value is true!
+
+Laravel uses `PHPUnit` for tests by default.
+If we run `vendor/bin/phpunit` we should see green!
+
+```bash
+vendor/bin/phpunit
+OK (1 test, 1 assertions)
+```
+
+This test will be used later for continuously testing our app with GitLab CI.
+
+### Push to GitLab
+
+Since we have our app up and running locally, it's time to push the codebase to our remote repository.
+Let's create [a new project](https://docs.gitlab.com/ee/gitlab-basics/create-project.html) in GitLab named `laravel-sample`.
+After that, follow the command line instructions displayed on the project's homepage to initiate the repository on our machine and do the first commit.
+
+
+```bash
+cd laravel-sample
+git init
+git remote add origin git@gitlab.example.com:<USERNAME>/laravel-sample.git
+git add .
+git commit -m 'Initial Commit'
+git push -u origin master
+```
+
+## Configure the production server
+
+Before we begin setting up Envoy and GitLab CI, let's quickly make sure the production server is ready for deployment.
+We have installed LEMP stack which stands for Linux, Nginx, MySQL and PHP on our Ubuntu 16.04.
+
+### Create a new user
+
+Let's now create a new user that will be used to deploy our website and give it
+the needed permissions using [Linux ACL](https://serversforhackers.com/video/linux-acls):
+
+```bash
+# Create user deployer
+sudo adduser deployer
+# Give the read-write-execute permissions to deployer user for directory /var/www
+sudo setfacl -R -m u:deployer:rwx /var/www
+```
+
+If you don't have ACL installed on your Ubuntu server, use this command to install it:
+
+```bash
+sudo apt install acl
+```
+
+### Add SSH key
+
+Let's suppose we want to deploy our app to the production server from a private repository on GitLab. First, we need to [generate a new SSH key pair **with no passphrase**](../../ssh/README.md) for the deployer user.
+
+After that, we need to copy the private key, which will be used to connect to our server as the deployer user with SSH, to be able to automate our deployment process:
+
+```bash
+# As the deployer user on server
+#
+# Copy the content of public key to authorized_keys
+cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
+# Copy the private key text block
+cat ~/.ssh/id_rsa
+```
+
+Now, add it to your GitLab project as a [secret variable](../../ci/variables/README.html#secret-variables).
+Secret variables are user-defined variables and are stored out of `.gitlab-ci.yml`, for security purposes.
+They can be added per project by navigating to **Project** > **Settings** > **CI/CD Pipelines**.
+
+![secret variables page](img/secret_variables_page.png)
+
+To the field **KEY**, add the name `SSH_PRIVATE_KEY`, and to the **VALUE** field, paste the private key you've copied earlier.
+We'll use this variable in the `.gitlab-ci.yml` later, to easily connect to our remote server as the deployer user without entering its password.
+
+We also need to add the public key to **Project** > **Settings** > **Repository** as [Deploy Keys](../../ce/ssh/README.html/#deploy-keys), which gives us the ability to access our repository from the server through [SSH protocol](../../ee/gitlab-basics/command-line-commands.html/#start-working-on-your-project).
+
+
+```bash
+# As the deployer user on the server
+#
+# Copy the public key
+cat ~/.ssh/id_rsa.pub
+```
+
+![deploy keys page](img/deploy_keys_page.png)
+
+To the field **Title**, add any name you want, and paste the public key into the **Key** field.
+
+Now, let's clone our repository on the server just to make sure the `deployer` user has access to the repository.
+
+```bash
+# As the deployer user on server
+#
+git clone git@gitlab.example.com:<USERNAME>/laravel-sample.git
+```
+
+>**Note:**
+Answer **yes** if asked `Are you sure you want to continue connecting (yes/no)?`.
+It adds GitLab.com to the known hosts.
+
+### Configuring Nginx
+
+Now, let's make sure our web server configuration points to the `current/public` rather than `public`.
+
+Open the default Nginx server block configuration file by typing:
+
+```bash
+sudo nano /etc/nginx/sites-available/default
+```
+
+The configuration should be like this.
+
+```
+server {
+    root /var/www/app/current/public;
+    server_name example.com;
+    # Rest of the configuration
+}
+```
+
+>**Note:**
+You may replace the app's name in `/var/www/app/current/public` with the folder name of your application.
+
+## Setting up Envoy
+
+So we have our Laravel app ready for production.
+The next thing is to use Envoy to perform the deploy.
+
+To use Envoy, we should first install it on our local machine [using the given instructions by Laravel](https://laravel.com/docs/envoy/#introduction).
+
+### How Envoy works
+
+The pros of Envoy is that it doesn't require Blade engine, it just uses Blade syntax to define tasks.
+To start, we create an `Envoy.blade.php` in the root of our app with a simple task to test Envoy.
+
+
+```php
+@servers(['web' => 'remote_username@remote_host'])
+
+@task('list', [on => 'web'])
+    ls -l
+@endtask
+```
+
+As you may expect, we have an array within `@servers` directive at the top of the file, which contains a key named `web` with a value of the server's address (e.g. deployer@192.168.1.1).
+Then within our `@task` directive we define the bash commands that should be run on the server when the task is executed.
+
+On the local machine use the `run` command to run Envoy tasks.
+
+```bash
+envoy run list
+```
+
+It should execute the `list` task we defined earlier, which connects to the server and lists directory contents.
+
+Envoy is not a dependency of Laravel, therefore you can use it for any PHP application.
+
+### Zero downtime deployment
+
+Every time we deploy to the production server, Envoy downloads the latest release of our app from GitLab repository and replace it with preview's release.
+Envoy does this without any [downtime](https://en.wikipedia.org/wiki/Downtime),
+so we don't have to worry during the deployment while someone might be reviewing the site.
+Our deployment plan is to clone the latest release from GitLab repository, install the Composer dependencies and finally, activate the new release.
+
+#### @setup directive
+
+```php
+...
+
+@setup
+    $repository = 'git@gitlab.example.com:<USERNAME>/laravel-sample.git';
+    $releases_dir = '/var/www/app/releases';
+    $app_dir = '/var/www/app';
+    $release = date('YmdHis');
+    $new_release_dir = $releases_dir .'/'. $release;
+@endsetup
+
+...
+```
+
+- `$repository` is the address of our repository
+- `$releases_dir` directory is where we deploy the app
+- `$app_dir` is the actual location of the app that is live on the server
+- `$release` contains a date, so every time that we deploy a new release of our app, we get a new folder with the current date as name
+- `$new_release_dir` is the full path of the new release which is used just to make the tasks cleaner
+
+The first step of our deployment process is to define a set of variables within [@setup](https://laravel.com/docs/envoy/#setup) directive.
+You may change the `app` to your application's name.
+
+#### @story directive
+
+```php
+...
+
+@story('deploy')
+    clone_repository
+    run_composer
+    update_symlinks
+@endstory
+
+...
+```
+
+The [@story](https://laravel.com/docs/envoy/#stories) directive allows us define a list of tasks that can be run as a single task.
+Here we have three tasks called `clone_repository`, `run_composer`, `update_symlinks`. These variables are usable to making our task's codes more cleaner.
+
+Let's create these three tasks one by one.
+
+#### Clone the repository
+
+The first task will create the `releases` directory (if it doesn't exist), and then clone the `master` branch of the repository (by default) into the new release directory, given by the `$new_release_dir` variable.
+The `releases` directory will hold all our deployments:
+
+```php
+...
+
+@task('clone_repository')
+    echo 'Cloning repository'
+    [ -d {{ $releases_dir }} ] || mkdir {{ $releases_dir }}
+    git clone --depth 1 {{ $repository }} {{ $new_release_dir }}
+@endtask
+
+...
+```
+
+While our project grows, its Git history will be very very long over time.
+Since we are creating a directory for each release, it might not be necessary to have the history of the project downloaded for each release.
+The `--depth 1` option is a great solution which saves systems time and disk space as well.
+
+#### Installing dependencies with Composer
+
+As you may suppose, this task just navigates to the new release directory and runs Composer to install the application dependencies:
+
+```php
+...
+
+@task('run_composer')
+    echo "Starting deployment ({{ $release }})"
+    cd {{ $new_release_dir }}
+    composer install --prefer-dist --no-scripts -q -o
+@endtask
+
+...
+```
+
+#### Activate new release
+
+Next thing to do after preparing the requirements of our new release, is to remove the storage directory from it and to create two symbolic links to point the application's `storage` directory and `.env` file to the new release.
+Then, creating another symbolic link to the new release with the name of `current` placed in the app directory.
+The `current` symbolic link always points to the latest release of our app:
+
+```php
+...
+
+@task('update_symlinks')
+    echo "Linking storage directory"
+    rm -rf {{ $new_release_dir }}/storage
+    ln -nfs {{ $app_dir }}/storage {{ $new_release_dir }}/storage
+
+    echo 'Linking .env file'
+    ln -nfs {{ $app_dir }}/.env {{ $new_release_dir }}/.env
+
+    echo 'Linking current release'
+    ln -nfs {{ $new_release_dir }} {{ $app_dir }}/current
+@endtask
+```
+
+As you see, we use `-nfs` as an option for `ln` command, which says that the `storage`, `.env` and `current` no longer points to the preview's release and will point them to the new release by force (`f` from -nfs means force), which is the case when we are doing multiple deployments.
+
+### Full script
+
+The script is ready, but make sure to change the `deployer@192.168.1.1` to your server and also change `/var/www/app` with the directory you want to deploy your app.
+
+At the end, our `Envoy.blade.php` file will look like this:
+
+```php
+@servers(['web' => 'deployer@192.168.1.1'])
+
+@setup
+    $repository = 'git@gitlab.example.com:<USERNAME>/laravel-sample.git';
+    $releases_dir = '/var/www/app/releases';
+    $app_dir = '/var/www/app';
+    $release = date('YmdHis');
+    $new_release_dir = $releases_dir .'/'. $release;
+@endsetup
+
+@story('deploy')
+    clone_repository
+    run_composer
+    update_symlinks
+@endstory
+
+@task('clone_repository')
+    echo 'Cloning repository'
+    [ -d {{ $releases_dir }} ] || mkdir {{ $releases_dir }}
+    git clone --depth 1 {{ $repository }} {{ $new_release_dir }}
+@endtask
+
+@task('run_composer')
+    echo "Starting deployment ({{ $release }})"
+    cd {{ $new_release_dir }}
+    composer install --prefer-dist --no-scripts -q -o
+@endtask
+
+@task('update_symlinks')
+    echo "Linking storage directory"
+    rm -rf {{ $new_release_dir }}/storage
+    ln -nfs {{ $app_dir }}/storage {{ $new_release_dir }}/storage
+
+    echo 'Linking .env file'
+    ln -nfs {{ $app_dir }}/.env {{ $new_release_dir }}/.env
+
+    echo 'Linking current release'
+    ln -nfs {{ $new_release_dir }} {{ $app_dir }}/current
+@endtask
+```
+
+One more thing we should do before any deployment is to manually copy our application `storage` folder to the `/var/www/app` directory on the server for the first time.
+You might want to create another Envoy task to do that for you.
+We also create the `.env` file in the same path to setup our production environment variables for Laravel.
+These are persistent data and will be shared to every new release.
+
+Now, we would need to deploy our app by running `envoy run deploy`, but it won't be necessary since GitLab can handle that for us with CI's [environments](../../ce/ci/environments.html), which will be described [later](#setting-up-gitlab-ci) in this tutorial.
+
+It is time to commit [Envoy.blade.php](https://gitlab.com/mehranrasulian/laravel-sample/blob/master/Envoy.blade.php) and push it to the `master` branch.
+To keep things simple, we commit directly to `master`, without using [feature-branches](../../ee/workflow/gitlab_flow.html/#github-flow-as-a-simpler-alternative) since collaboration is beyond the scope of this tutorial.
+In a real world project, teams may use [Issue Tracker](../../user/project/issues/index.md) and [Merge Requests](../../user/project/merge_requests/index.md) to move their code across branches:
+
+```bash
+git add Envoy.blade.php
+git commit -m 'Add Envoy'
+git push origin master
+```
+
+## Continuous Integration with GitLab
+
+We have our app ready on GitLab, and we also can deploy it manually.
+But let's take a step forward to do it automatically with Continuous Delivery method.
+We need to check every commit with a set of automated tests to become aware of issues at the earliest, and then, we can deploy to the target environment if we are happy with the result of the tests.
+
+[GitLab CI](/gitlab-ci/) allows us to use [Docker](https://docker.com/) engine to handle the process of testing and deploying our app.
+In the case you're not familiar with Docker, refer to [How to Automate Docker Deployments](http://paislee.io/how-to-automate-docker-deployments/).
+
+Before setting up GitLab CI, we need to prepare our work environment to be able to build, test, and deploy our app with GitLab CI.
+To do that, We'll use a Docker image which has the minimum requirements that a Laravel app needs to run.
+[There are other ways](../../ce/ci/examples/php.html/#test-php-projects-using-the-docker-executor) to do that as well, but they may lead our builds run slowly, which is not what we want when there are faster options to use.
+
+With Docker images our builds run incredibly faster!
+
+### Create a Container Image
+
+Let's create a [Dockerfile](https://gitlab.com/mehranrasulian/laravel-sample/blob/master/Dockerfile) in the root directory of our app with the following content:
+
+```bash
+# Set the base image for subsequent instructions
+FROM php:7.1
+
+# Update packages
+RUN apt-get update
+
+# Install PHP and composer dependencies
+RUN apt-get install git curl libmcrypt-dev libjpeg-dev libpng-dev libfreetype6-dev libbz2-dev -yqq
+
+# Clear out the local repository of retrieved package files
+RUN apt-get clean
+
+# Install needed extensions
+# Here you can install any other extension that you need during the test and deployment process
+RUN docker-php-ext-install mcrypt pdo_mysql zip
+
+# Install Composer
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+
+# Install Laravel Envoy
+RUN composer global require "laravel/envoy=~1.0"
+```
+
+We added the [official PHP 7.1 Docker image](https://hub.docker.com/r/_/php/), which consist of a minimum installation of Debian Jessie with PHP pre-installed, and works perfectly for our use case.
+
+We used `docker-php-ext-install` (provided by the official PHP Docker image) to install the PHP extensions we need.
+
+#### Setting Up GitLab Container Registry
+
+Now that we have our `Dockerfile` let's build and push it to our [GitLab Container Registry](../ce/user/project/container_registry.html).
+
+> The registry is the place to store and tag images for later use. Developers may want to maintain their own registry for private, company images, or for throw-away images used only in testing. Using GitLab Container Registry means you don't need to set up and administer yet another service or use a public registry.
+
+On your GitLab project repository navigate to the **Registry** tab.
+
+![container registry page empty image](img/container-registry-page-empty-image.png)
+
+You may need to enable container registry (under project's settings) to your project to see this tab.
+![container registry checkbox](img/container-registry-checkbox.png)
+
+To start using Container Registry on our machine, we first need to login to the GitLab registry using our GitLab username and password.
+
+```bash
+docker login registry.gitlab.com
+```
+Then we can build and push our image to GitLab:
+
+```bash
+docker build -t registry.gitlab.com/<USERNAME>/laravel-sample .
+
+docker push registry.gitlab.com/<USERNAME>/laravel-sample
+```
+
+>**Note:**
+To run the above commands, we first need to have [Docker](https://docs.docker.com/engine/installation/) installed on our machine.
+
+Congratulations! You just pushed the first Docker image to the GitLab registry, and if you refresh the page you should be able to see it.
+
+![container registry page with image](img/container-registry-page-with-image.png)
+
+>**Note:**
+You can also [use GitLab CI](https://about.gitlab.com/2016/05/23/gitlab-container-registry/#use-with-gitlab-ci) to build and push your Docker images, rather than doing that on your machine!
+
+We'll use this image further down in the `.gitlab-ci.yml` config file to handle the process of testing and deploying our app.
+
+Let's commit the `Dockerfile` file.
+
+```bash
+git add Dockerfile
+git commit -m 'Add Dockerfile'
+git push origin master
+```
+
+### Setting up GitLab CI
+
+In order to build and test our app with GitLab CI, we need a file called `.gitlab-ci.yml` in our repository's root. It is similar to Circle CI and Travis CI, but built in GitLab.
+
+```yaml
+image: registry.gitlab.com/<USERNAME>/laravel-sample:latest
+
+services:
+  - mysql:5.7
+
+variables:
+  MYSQL_DATABASE: homestead
+  MYSQL_ROOT_PASSWORD: secret
+
+stages:
+  - test
+  - deploy
+
+unit_test:
+  stage: test
+  script:
+    - composer install
+    - cp .env.example .env
+    - php artisan key:generate
+    - php artisan migrate
+    - vendor/bin/phpunit
+
+deploy_production:
+  stage: deploy
+  script:
+    - 'which ssh-agent || ( apt-get update -y && apt-get install openssh-client -y )'
+    - eval $(ssh-agent -s)
+    - ssh-add <(echo "$SSH_PRIVATE_KEY")
+    - mkdir -p ~/.ssh
+    - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
+
+    - ~/.composer/vendor/bin/envoy run deploy
+  environment:
+    name: production
+    url: http://192.168.1.1
+  when: manual
+  only:
+    - master
+```
+
+That's a lot to take in, isn't it? Let's run through it step by step.
+
+#### Image and Services
+
+[GitLab Runners](../ee/ci/runners/README.html) run the script defined by .gitlab-ci.yml.
+The `image` keyword tells the Runners which image to use.
+The `services` keyword defines additional images [that are linked to the main image](../ce/ci/docker/using_docker_images.html/#what-is-a-service).
+Here we use the container image we created before as our main image and also use MySQL 5.7 as a service.
+
+```yaml
+image: registry.gitlab.com/<USERNAME>/laravel-sample:latest
+
+services:
+  - mysql:5.7
+
+...
+```
+
+>**Note:**
+If you wish to test your app with different PHP versions and [database management systems](../ee/ci/services/README.html), you can define different `image` and `services` keywords for each test job.
+
+#### Variables
+
+GitLab CI allows us to use [environment variables](../ce/ci/yaml/#variables) in our jobs.
+We defined MySQL as our database management system, which comes with a superuser root, created by default.
+So we just should adjust the configuration of MySQL instance by defining `MYSQL_DATABASE` variable as our database name and `MYSQL_ROOT_PASSWORD` variable as the password of `root`.
+Find out more about MySQL variables at the [official MySQL Docker Image](https://hub.docker.com/r/_/mysql/).
+
+```yaml
+...
+
+variables:
+  MYSQL_DATABASE: homestead
+  MYSQL_ROOT_PASSWORD: secret
+
+...
+```
+
+Clone the `.env.example` file to `.env.testing` from your root repository and set the variables `DB_HOST` to `mysql` and `DB_USERNAME` to `root`.  Make sure to set the `APP_KEY` for `.env.testing` as well. This file will override values from the `.env` file when running PHPUnit tests or executing Artisan commands with the `--env=testing option`.
+
+We define `DB_HOST` as `mysql` instead of `127.0.0.1`, as we use MySQL Docker image as a service which [is linked to the main Docker image](../ce/ci/docker/using_docker_images.html/#how-services-are-linked-to-the-build).
+
+#### Unit Test as the first job
+
+We defined the required shell scripts as an array of the [script](../ce/ci/yaml/#script) variable to be executed when running `unit_test` job.
+
+These scripts are some Artisan commands to prepare the Laravel, and, at the end of the script, we'll run the tests by `PHPUnit`.
+
+```yaml
+...
+
+unit_test:
+  script:
+    # Install app dependencies
+    - composer install
+    # Setup .env
+    - cp .env.example .env
+    # Generate an environment key
+    - php artisan key:generate
+    # Run migrations
+    - php artisan migrate
+    # Run tests
+    - vendor/bin/phpunit
+
+...
+```
+
+#### Deploy Production
+
+The job `deploy_production` will deploy the app to the production server.
+To deploy our app with Envoy, we had to set up the `$SSH_PRIVATE_KEY` variable as an [SSH private key](../ce/ci/ssh_keys/README.html/#ssh-keys-when-using-the-docker-executor).
+If the SSH keys have added successfully, we can run Envoy.
+
+GitLab CI supports [Continuous Delivery](https://about.gitlab.com/2016/08/05/continuous-integration-delivery-and-deployment-with-gitlab/#continuous-delivery) as well.
+The [environment](../ce/ci/yaml/#environment) keyword tells GitLab that this job deploys to the `production` environment.
+The `url` keyword is used to generate a link to our application on the GitLab Environments page.
+The `only` keyword tells GitLab CI that the job should be executed only when the pipeline is building the `master` branch.
+Lastly, `when: manual` is used to turn the job from running automatically to a manual action.
+
+```yaml
+...
+
+deploy_production:
+  script:
+    # Add the private SSH key to the build environment 
+    - 'which ssh-agent || ( apt-get update -y && apt-get install openssh-client -y )'
+    - eval $(ssh-agent -s)
+    - ssh-add <(echo "$SSH_PRIVATE_KEY")
+    - mkdir -p ~/.ssh
+    - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
+
+    # Run Envoy
+    - ~/.composer/vendor/bin/envoy run deploy
+
+  environment:
+    name: production
+    url: http://192.168.1.1
+  when: manual
+  only:
+    - master
+```
+
+You may also want to add another job for [staging environment](https://about.gitlab.com/2016/08/26/ci-deployment-and-environments), to final test your application before deploying to production.
+
+### Turn on GitLab CI
+
+We have prepared everything we need to test and deploy our app with GitLab CI.
+To do that, commit and push `.gitlab-ci.yml` to the `master` branch. It will trigger a pipeline, which you can watch live under your project's **Pipelines**.
+
+![pipelines page](img/pipelines-page.png)
+
+Here we see our **Test** and **Deploy** stages.
+The **Test** stage has the `unit_test` build running.
+click on it to see the Runner's output.
+
+![pipeline page](img/pipeline_page.png)
+
+After our code passed through the pipeline successfully, we can deploy to our production server by clicking the **play** button on the right side.
+
+![pipelines page deploy button](img/pipelines_page_deploy_button.png)
+
+Once the deploy pipeline passed successfully, navigate to **Pipelines > Environments**.
+
+![environments page](img/environments_page.png)
+
+If something doesn't work as expected, you can roll back to the latest working version of your app.
+
+![environment page](img/environment_page.png)
+
+By clicking on the external link icon specified on the right side, GitLab opens the production website.
+Our deployment successfully was done and we can see the application is live.
+
+![laravel welcome page](img/laravel_welcome_page.png)
+
+In the case that you're interested to know how is the application directory structure on the production server after deployment, here are three directories named `current`, `releases` and `storage`.
+As you know, the `current` directory is a symbolic link that points to the latest release.
+The `.env` file consists of our Laravel environment variables.
+
+
+![production server app directory](img/production_server_app_directory.png)
+
+If you navigate to the `current` directory, you should see the application's content.
+As you see, the `.env` is pointing to the `/var/www/app/.env` file and also `storage` is pointing to the `/var/www/app/storage/` directory.
+
+![production server current directory](img/production_server_current_directory.png)
+
+## Conclusion
+
+We configured GitLab CI to perform automated tests and used the method of [Continuous delivery](https://continuousdelivery.com/) to deploy to production a Laravel application with Envoy, directly from the codebase.
+Envoy also was a great match to help us deploy the application without writing our custom bash script and doing Linux magics.
+
+## About guest author
+Mehran is a web developer writing applications with PHP, Javascript. Recently interested in learning swift.
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