504 Gateway Timeout -- Memory Error

I’m getting “504 Gateway Timeout” error on the production site, and I know I’m pointing to the server because if I access this route https://165.227.0.69:8080/test I get the expected result.

I ran in this while looking for answers:

https://www.digitalocean.com/community/questions/recurring-502-bad-gateway-nginx-and-504-gateway-time-out-nginx-error

I ran the commands described above and got the following results:

1. free -m

total used free shared buff/cache available Mem: 985 190 192 0 602 642 Swap: 0 0 0

2. mpstat

Linux 4.15.0-51-generic (ubuntu-s-1vcpu-1gb-sfo2-01) 06/11/19 x86_64 (1 CPU)

14:07:05 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle 14:07:05 all 0.31 0.01 0.07 0.28 0.00 0.00 0.01 0.00 0.00 99.33

The first one it’s confusing since it shows that we have as free memory only 190 but then it shows 642 as available? The post said this error could be related to not having enough memory for the server, but how can I be sure about this?

I have 2 html websites and this angular firebase application (which we’re trying to configure with socket.io) running on a 1 GB Memory / 25 GB Disk / SFO2 - Ubuntu 16.04.5 x64 which has been upgraded to 18.04.