Issue #83: More tweaks for Let's Encrypt example in chapter 12.

https-letsencrypt/README.md

@@ -13,8 +13,8 @@ This demonstrates generating valid TLS certificates using Let's Encrypt and Cert
 
   1. Create a publicly-accessible VM running Ubuntu 18.04 (on your favorite cloud provider, like AWS, DigitalOcean, etc.).
   2. Point a valid domain name at this server's IP address (e.g. using Route53 or your DNS provider).
-  3. Make sure your SSH key is added to the root user account.
-  4. Make sure you can SSH into the server using `ssh root@domain.example.com` (where `domain.example.com` is the domain name you have pointed at the server's IP address).
+  3. Make sure your SSH key is added to your user account, and your account has `sudo` access.
+  4. Make sure you can SSH into the server using `ssh myuser@subdomain.example.com` (where `subdomain.example.com` is the domain name you have pointed at the server's IP address).
 
 ### 3 - Configure the inventory
 

https-letsencrypt/inventory.example

@@ -1,2 +1,2 @@
 [letsencrypt]
-domain.example.com ansible_ssh_user=root [email protected]
+subdomain.example.com ansible_ssh_user=myuser [email protected]

https-letsencrypt/main.yml

@@ -1,5 +1,5 @@
 ---
-- hosts: all
+- hosts: letsencrypt
   gather_facts: false
   become: true
 
@@ -15,7 +15,7 @@
       setup:
 
     - name: Ensure apt cache is updated.
-      apt: update_cache=yes cache_valid_time=600
+      apt: update_cache=true cache_valid_time=600
 
   roles:
     - geerlingguy.firewall

https-letsencrypt/vars/main.yml

@@ -7,13 +7,13 @@ firewall_allowed_tcp_ports:
 
 # Nginx settings.
 nginx_vhosts: []
-nginx_remove_default_vhost: True
-nginx_ppa_use: True
+nginx_remove_default_vhost: true
+nginx_ppa_use: true
 nginx_ppa_version: stable
 nginx_docroot: /var/www/html
 
 # Let's Encrypt certificate settings.
-certbot_create_if_missing: yes
+certbot_create_if_missing: true
 certbot_admin_email: "{{ letsencrypt_email }}"
 certbot_certs:
   - domains: