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TL;DR: It depends, as most things in IT do.

It helps to know how your application functions/where the bottlenecks are. But again, would really really recommend hiring a consultant/sysadmin. That's great, and it could make things easier. Or it might not. Because, again, it's far from a one-size fit all solution. This article might be a...

It's a good goal, but not one I can provide an answer to here and now. Again, there are many many many variables. For one, how much load exactly? What kind of budget? Are you solely trying to meet a concurrency goal? Or HA for uptime/failover? Do you currently have this traffic? Is it bursts or...

Not really a Plesk question. Tuning NGINX or anything really requires knowledge of what you're hosting. Streaming videos? Building a CDN? A forum? I'd recommend either doing some research yourself on what-does-what when it comes to NGINX, or hiring a system admin. Any advice I or anyone else...

This isn't a bug, so it shouldn't be here. You can update your MDB to 10.5:  How to upgrade MySQL 5.5 to 5.6/5.7 or MariaDB 5.5 to 10.x on Linux?

Have you tried: yum install plesk-php80-devel

You can use the wp-toolkit cli, and register the instance: wp-toolkit: WordPress Toolkit

Here's a "hacky" solution we ran by Plesk support: Note, this is not supported by Plesk, and could break in the coming updates - a cron job via CLI is a better idea, though that lacks auto-pruning. Their response: So - use at your own risk. You'll have to manage the rules via MySQL, not GUI.

It looks like it is doing a graceful restart. If the website works while apache "down" you should be fine, though you'll want to figure out what is trying to restart apache every hour. A graceful restart has, in theory, zero downtime as requests are gracefully finished, and new requests are queued.

You don't need to use the Plesk firewall to use IPtables

> Thanks John for the advice. But doesn't the modem's IP address change once in a while on behalf of the ISP? Wouldn't I need a permanent IP address? It may, it may not. Totally depends on your ISP. We firewall off everything so only internal networks (ie, VPN) can access the server, so we just...

Quick note @Coltrane70 for future reference - you can just whitelist your IP by adding it to f2b via "Trusted IPs" in Plesk and it won't ban you. Not redundant - you can post the ID. It doesn't - both are used. One is applied per-site, another globally.

Yes, it does

Is postfix running?

Generally, it's expected that you maintain at least some basic knowledge of system administration. Plesk is not a replacement for a system's administrator, nor does it do everything you should be doing. Otherwise, submit a feature request in user voice

We don't have it loaded, but the configuration is:

Yeah, it's just not allowed in the A + N settings. You can edit the nginx configuration files directly. It'll be overwritten, but this should only be a temporary change anyways. It should be in /var/www/vhosts/system/<domain>/conf

Yes.

Yeah - I think the user was on Centmindmod (which has some really great tweaks) so his 5.5 was tuned well, but on upgrade, they reverted to default. So, it wasn't default to default per-se....

As for the answer to your latter question: The database itself could pose a bottleneck if you have sufficiently tested it. You always want to benchmark your server an see how it performs when pushed to the limits. You could check out loader.io, k6s.io, work, h2load, ab, siege, etc You'll also...