docker run -e NODE_ENV=production --name ghost1 -v /path/to/data/ghost/ghost1/:/var/lib/ghost -d ghost
docker run -e NODE_ENV=production --name ghost2 -v /path/to/data/ghost/ghost2/:/var/lib/ghost -d ghost

root@fabfd4bacfda:/# cat /etc/hosts
172.17.0.3   ghost1 d19c0134011a
172.17.0.5   ghost2 0e2e66ba70e0
172.17.0.4   fabfd4bacfda

http {
  server {
    listen 80;
    server_name www.domain1.tk domain1.tk;

    location / {
      proxy_pass http://ghost1:2368;
      proxy_redirect   off;
      proxy_set_header  Host       $host;
      proxy_set_header  X-Real-IP    $remote_addr;
      proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
    }
  }
  server {
    listen 80;
    server_name www.domain2.tk domain2.tk;

    location / {
      proxy_pass http://ghost2:2368;
      proxy_redirect   off;
      proxy_set_header  Host       $host;
      proxy_set_header  X-Real-IP    $remote_addr;
      proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
    }
  }

}