MRTG on Lightsail Ubuntu

While I don't have specific information about setting up MRTG (Multi Router Traffic Grapher) on a Lightsail Ubuntu instance, I can provide some related information that might be helpful for monitoring your Lightsail instance, including RAM usage.

For monitoring system resources on a Lightsail Ubuntu instance, a popular open-source tool that's often used is Prometheus along with Node Exporter. This combination allows you to collect and store time-series data about your system's performance, including RAM usage.

To set this up on a Lightsail Ubuntu instance, you would need to:

1. Create a Lightsail instance using the Ubuntu blueprint.
2. Attach a static IP address to your instance.
3. Open the necessary ports in your instance's firewall (typically ports 9090 and 9100 for Prometheus and Node Exporter).
4. Install Prometheus and Node Exporter on your instance.
5. Configure Prometheus to collect data from Node Exporter.

Once set up, you can use Prometheus to monitor various system metrics, including RAM usage. This setup would allow you to track memory utilization over time and set up alerts if usage exceeds certain thresholds.

If you're experiencing issues with your Lightsail instance freezing or becoming unresponsive, monitoring RAM usage is indeed crucial. It's worth noting that by default, Ubuntu doesn't create a swap file, which can lead to system crashes if memory usage hits maximum capacity. Creating a swap file might help prevent such issues.

Additionally, Lightsail provides some built-in instance metrics that you can view, such as CPU utilization and burst capacity. These metrics can be useful for understanding your instance's performance and resource usage.

While this isn't specifically about MRTG, these alternative monitoring solutions should provide you with the ability to track RAM usage and other important system metrics on your Lightsail Ubuntu instance.
Sources
Monitor system resources and apps with Prometheus on Lightsail - Amazon Lightsail
Lightsail Instance Freezing | AWS re:Post

Hello.

Since Lightsail itself is a normal virtual server, I think you can install MRTG using the installation method that suits the OS you are using.
For example, if you choose Ubuntu on Lightsail, I think you can install it by referring to the following document.
https://help.ubuntu.com/community/MRTG