Zabbix has been running now for half an hour, and it’s now showing some errors that need fixing.
1st Error is about Zabbix-agent on zabbix-server. I install it and start it, and now the graphs are showing data.
I’ve registered a domain name elsewhere and pointed the A name record to the new IP address I got from Digital Ocean,
I’ve install certbot with the apache addon, which installs the SSL certificate and sets it up on apache.
I then fix the swap file problem reported in Zabbix by using the information in this video. https://www.youtube.com/watch?v=hXb50RxB-YU
Zabbix is all happy now, and so am I.