In your screenshot, you have database host : Localhost. You should change it to your postgresql host, i believe the 35.200.156.83

Also i don't know if your OS is equiped with SELinux, but it could be that you need to alter the SElinux config to allow http and php to communicatie to your database. For mysql you need the following selinux configs :
setsebool -P httpd_can_network_connect 1
setsebool -P httpd_can_network_connect_db 1

Hi there.
It never hurts to be a member of multiple communities. Seems like lot of known names are here.... can't be bad.

I used Evolution on my box and this works very well. But i stopped using it in favour of OWA once we were on office365. Evolution still works on office365, but the owa interface (chromium and firefox alike) works very well.

Besides anisble there are other tools for remote tooling. In a linux world you need bash. this is a basic need.
On top of bash, it really depends on the environmnet you're in. I would suggest python on top of this. You can use python in ansible, chef, terraform, etc... Also on non linux environments, python is availlable (bsd, windows).