Manage environment variables to avoid hardcode and share code without…

… revealing database login credentials

README.md

@@ -1,9 +1,16 @@
 # php-app-with-slim-and-docker
 PHP Application with SLIMPHP web framework using Docker connecting to third-party API
 
+
+## Build the image and tagged it as kenvilar/weather-app to easily create a container from this image
+```docker
+docker build . -t kenvilar/weather-app
 ```
-$ docker pull php:latest
-$ docker pull php:5.6
+
+
+```docker
+docker pull php:latest  
+docker pull php:5.6     
 # run the hello.php (optional)
 docker run --rm -v $(pwd):/app php:latest php /app/hello.php
 # install the slim library
@@ -13,16 +20,20 @@ docker run --rm -p 38000:80 -v $(pwd):/var/www/html php:apache
 # or run the app in detached mode
 docker run -d --rm -p 38000:80 -v $(pwd):/var/www/html php:apache
 # name the container
-docker run -d --rm --name=weather-app -p 38000:80 -v $(pwd):/var/www/html php:apache
+docker run -d --rm --name=weather_app -p 38000:80 -v $(pwd):/var/www/html php:apache
 # display running containers
-docker ps
+docker ps       
 # or display all containers including the stopped containers
-docker ps -a
+docker ps -a        
 # stop the container with id of three characters or more
-docker stop <ID>
+docker stop <ID>        
 # stop the container (alternative)
-docker stop <container-name>
-# run the docker container again by typing this command docker run -d --rm --name=weather-app -p 38000:80 -v $(pwd):/var/www/html php:apache
+docker stop <container-name>    
+```
+
+```docker
+# run the docker container again 
+docker run -d --rm --name=weather_app -p 38000:80 -v $(pwd):/var/www/html php:apache
 # run the database container and named it as weather_db from image mysql with version  5.7
 docker run -d --rm --name=weather_db -e MYSQL_USER=kenvilar -e MYSQL_DATABASE=weather_app -e MYSQL_PASSWORD=kenvilarsamplepassword -e MYSQL_RANDOM_ROOT_PASSWORD=true mysql:5.7
 # check if the database weather_app is running
@@ -51,6 +62,11 @@ mysql> show tables;
 
 # Linking the PHP container
 ```docker
-docker run -d --rm --name=weather-app -p 38000:80 -v $(pwd):/var/www/html --link weather_db kenvilar/weather-app
-# if it gets an error then you have to remove the container named weather-app
-```
+docker run -d --rm --name=weather_app -p 38000:80 -v $(pwd):/var/www/html --link weather_db kenvilar/weather-app
+# if it gets an error then you have to remove the container named weather_app
+```
+
+# Stop the container and re-run it with the environment variables
+```docker
+docker run -d --rm --name=weather_app -p 38000:80 -v $(pwd):/var/www/html --link weather_db -e DATABASE_HOST='weather_db' -e DATABASE_USER='kenvilar' -e DATABASE_PASSWORD='kenvilarsamplepassword' -e DATABASE_NAME='weather_app' kenvilar/weather-app
+```

index.php

@@ -7,10 +7,10 @@
     },
     'mysql' => function () {
         $mysqli = new mysqli(
-            'weather_db',
-            'kenvilar',
-            'kenvilarsamplepassword',
-            'weather_app'
+            getenv('DATABASE_HOST'),
+            getenv('DATABASE_USER'),
+            getenv('DATABASE_PASSWORD'),
+            getenv('DATABASE_NAME')
         );
         if ($mysqli->connect_errno) {
             echo "Failed to connect to MYSQL: " . $mysqli->connect_error;