Trying to configure a Ghost subdomain; what's wrong here?

So, I’ve got nginx up and running just fine, serving the main static site like I want it to. I’ve also got Ghost running just fine; if I plug in my site’s address and append :2368, I can look at the blog right now. Here’s how my zone file looks:

$ORIGIN landermkerbey.com.
$TTL 1800
landermkerbey.com. IN SOA ns1.digitalocean.com. hostmaster.landermkerbey.com. 1430683439 10800 3600 604800 1800
landermkerbey.com. 1800 IN A 162.243.45.221
landermkerbey.com. 1800 IN NS ns1.digitalocean.com.
landermkerbey.com. 1800 IN NS ns2.digitalocean.com.
landermkerbey.com. 1800 IN NS ns3.digitalocean.com.
*.landermkerbey.com. 1800 IN CNAME landermkerbey.com.
blog.landermkerbey.com. 1800 IN A 162.243.45.221

I have one nginx/sites-available file for both the main site and the blog, both of which have symbolic links in the sites-enabled directory. The one for the blog looks like this:

server {
listen 80 default_server;
listen [::]:80 default_server ipv6only=on;

server_name blog.landermkerbey.com; 
access_log /var/log/nginx/ghost.log


client_max_body_size 10G;

location / {
    proxy_pass http://localhost:2368;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_buffering off;
} 

It also has a location /doc and location /images section, though those are unedited from the default file provided by nginx.

As for my config.js file, I went ahead and modified the production section:

// ### Production
// When running Ghost in the wild, use the production environment
// Configure your URL and mail settings here
production: {
url: 'http://blog.landermkerbey.com',
mail: {},
database: {
client: 'sqlite3',
connection: {
filename: path.join(__dirname, '/content/data/ghost.db')
},
debug: false
},
server: {
// Host to be passed to node's net.Server#listen()
host: '127.0.0.1',
// Port to be passed to node's net.Server#listen(), for iisnode set this to process.env.PORT
port: '2368'
}
},

So, what am I doing wrong? Should the blog and main site be contained in a single sites-available file?