Ghost is an amazing blogging platform used to host this blog! Bitnami even has a prebuilt AMI to make it easy to get going with minimal setup. However, after a configuration change I ran into issues with Ghost not even starting! >.<
On linux, most logs are stored in /var/logs, which is what I expected for Ghost! But they weren't. It turns out the default location is content/logs/.
On bitnami, the install location is /opt/bitnami/ghost/ so the logs are in /opt/bitnami/ghost/content/logs.
Side-note: It is possible to change the log location - see https://ghost.org/docs/config/#logging for more details!