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readme.md

+# Docker Workshop
+Lab 1: Docker Compose
+
+---
+
+## Install docker-compose
+
+ - install docker-compose:
+```
+sudo apt install docker-compose
+```
+
+## Preparations
+
+ - Create a new folder for the lab:
+```
+mkdir lab-11
+cd lab-11
+```
+
+## Instructions
+
+- Create a **"docker-compose.yml"** file with the content below:
+
+```
+version: '3.3'
+
+services:
+  db:
+    image: mysql:5.7
+    volumes:
+    - db_data:/var/lib/mysql
+    restart: always
+    environment:
+      MYSQL_ROOT_PASSWORD: somewordpress
+      MYSQL_DATABASE: wordpress
+      MYSQL_USER: admin
+      MYSQL_PASSWORD: wordpress
+
+  wordpress:
+    depends_on:
+    - db
+    image: wordpress:latest
+    ports:
+    - "8000:80"
+    restart: always
+    environment:
+      WORDPRESS_DB_HOST: db:3306
+      WORDPRESS_DB_USER: admin
+      WORDPRESS_DB_PASSWORD: wordpress
+
+volumes:
+  db_data:
+```
+ 
+ - Start all the environment in detached mode:
+
+```
+ docker-compose up -d
+```
+ 
+ - Wait until docker complete to start the containers, meanwhile let's inspect the wordpress logs:
+
+```
+docker-compose logs -f wordpress
+```
+
+ - Check the running containers:
+
+```
+docker-compose ps
+```
+
+ - Browse to the wordpress portal:
+ 
+```
+http://<Your-Server-IP>:8000
+```
+  
+ - Enter to the mysql container:
+   
+```
+docker-compose exec db bin/bash
+```
+
+ - Print the environment variable **"MYSQL_USER"** (passed in the yaml file):
+   
+```
+echo $MYSQL_USER
+```
+
+ - Exit from the container
+```
+exit
+```
+  
+ - Update the mysql image used in the **docker-compose.yml** file to "5.7.24":
+```
+image: mysql:5.7.24
+```
+```
+db:
+  image: mysql:5.7.24
+  volumes:
+  - db_data:/var/lib/mysql
+  restart: always
+  environment:
+    MYSQL_ROOT_PASSWORD: somewordpress
+    MYSQL_DATABASE: wordpress
+    MYSQL_USER: admin
+    MYSQL_PASSWORD: wordpress
+```
+
+ - Apply the changes to the running environment:
+
+```
+docker-compose up -d
+```
+  
+ - Let's clean our environment (remove the containers defined in the docker-compose file):
+
+```
+docker-compose down
+```
+
+ - Note that volumes are not deleted by default, so you can recreate the environment at any time
+
+```
+docker volume ls
+```
+
+ - To remove the volumes as well you can use "docker-compose down --volume"
+ 
+