Add new exercises

Also added indexes for AWS and Linux.

exercises/containers/solutions/containerized_db.md

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+# Containerized DB
+
+1. Run a container with a database of any type of you prefer (MySql, PostgreSQL, Mongo, etc.)
+2. Verify the container is running
+3. Access the container and create a new table (or collection, depends on which DB type you chose) for students
+4. Insert a row (or document) of a student
+5. Verify the row/document was added
+
+
+## Solution
+
+```
+# Run the container
+podman run --name mysql -e MYSQL_USER=mario -e MYSQL_PASSWORD=tooManyMushrooms -e MYSQL_DATABASE=university -e MYSQL_ROOT_PASSWORD=MushroomsPizza -d mysql
+
+# Verify it's running
+podman ps
+
+# Add student row to the database
+podman exec -it mysql /bin/bash
+mysql -u root
+use university;
+CREATE TABLE Students (id int NOT NULL, name varchar(255) DEFAULT NULL, PRIMARY KEY (id));
+insert into Projects (id, name) values (1,'Luigi');
+select * from Students;
+```

exercises/containers/solutions/containerized_db_persistent_storage.md

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+# Containerized DB with Persistent Storage
+
+1. Run a container with a database of any type of you prefer (MySql, PostgreSQL, Mongo, etc.)
+  1. Use a mount point on the host for the database instead of using the container storage for that
+  2. Explain why using the host storage instead of the container one might be a better choice
+2. Verify the container is running
+
+
+## Solution
+
+```
+# Create the directory for the DB on host
+mkdir -pv ~/local/mysql
+sudo semanage fcontext -a -t container_file_t '/home/USERNAME/local/mysql(/.*)?'
+sudo restorecon -R /home/USERNAME/local/mysql
+
+# Run the container
+podman run --name mysql -e MYSQL_USER=mario -e MYSQL_PASSWORD=tooManyMushrooms -e MYSQL_DATABASE=university -e MYSQL_ROOT_PASSWORD=MushroomsPizza -d mysql -v /home/USERNAME/local/mysql:/var/lib/mysql/db
+
+# Verify it's running
+podman ps
+```
+
+It's better to use the storage host because in case the container ever gets removed (or storage reclaimed) you have the DB data still available.