You got a cert for that domain from Google Trust Services. This forum is for the Let's Encrypt Certificate Authority. Use a tool like crt.sh to see your cert history. Your latest cert is this one
You should ask about this on a forum for Google Cloud / Trust Services.
Yes! I was just looking into that! But I am not sure how to generate one for my subdomain. I have access to an SSH for my Compute Engine instance. Do you know how I can generate a cert here?
If your linux virtual machine is just a single instance and you have a domain pointing to it then you can use certbot (https://certbot.eff.org/) to acquire a certificate from any ACME CA (Let's Encrypt, Google etc). If it's starting from a image you provide (like a container image etc) that's more complicated. If it's part of an instance group (cluster of VMs) that's also more complicated.
Note that getting a certificate is one thing, deploying it is something else and the two things are not always directly connected.
To get a certificate you have to prove to the certificate authority (.e.g Let's Encrypt) that you control the domain, usually using either http or dns validation, using ACME via a tool such as certbot. Once you've completed that and got your certificate you will have a public certificate file (generated by the CA) and a private key file (generated by you), these combine to form the public and private parts of your certificate.
You then use these in whatever service need to use the certificate (most often a web server but also pretty much anything that has a domain name).
If you are using an external service in front of your server, such as a load balancer or application gateway service then generally you need to provide the cert to that so it knows how to terminate TLS for your domain, or occasionally the service provider (e.g. google) can automatically do all that for you and just proxy requests back to your server (e.g. via http or https).
I currently have an Ubuntu Compute Engine Instance running on Google Cloud, and have successfully pointed my pod.danielbakas.com domain to the server's external IP.
Right now I'm not sure whether I need to generate a certificate or if I already got one for that subdomain. If I do have one I am also curious as to how to retrieve the key and cert since the command I'm trying to use is asking for the http cert and key.
Thanks for your help!!! I'm excited to know what you think
If you ignore where your hosting is etc, what command are you trying to use, why, why are you not using certbot etc. Are you following some sort of guide for hosting something like a website?
Ok, try installing and using certbot to get a certificate. You will probably want to the the "standalone" option to perform http vailidation. Make sure port 80 is open so http validation will work.
Then use the fullchain.pem file that creates as the cert, and the privkey file as the key. Certbot Instructions | Certbot
sudo community-solid-server -b http://pod.danielbakas.com -c @css:config/https-file-cli.json -p 80 --httpsKey {File path to the HTTPS key} --httpsCert {File path to the HTTPS certificate}
on a Compute Engine with Ubuntu.