Questions[httpd](server)

So I just installed Apache on a new CentOS 7 server, using Yum. I've installed Apache many times before, but never have I seen this: When I run ps aux now, it always shows

/usr/sbin/httpd -DFOREGROUND

Google tells me that means the process will run in the foreground and not detach from the shell, but I don't really get what that means - if I close my shell, will Apache die?

I just want to get the normal Apache behaviour, and have httpd run like it always used to, chugging along in the background, do I need to disable DFOREGROUND? (I can't figure out how to btw)

This is a Canonical Question about selecting the right Apache httpd MPM.

I'm a little confused between the different MPMs offered by Apache - 'worker', 'event', 'prefork', etc.

What are the major differences between them, and how can I decide which one will be best for a given deployment?

What are some different ways/tools to verify that keep-alive is working on the server from the client's end?

I'm trying to configure mercurial access using Apache http. It requires authentication. My /etc/apache2/sites-enabled/mercurial looks like this:

NameVirtualHost *:8080

<VirtualHost *:8080>
    UseCanonicalName Off
    ServerAdmin  webmaster@localhost
    AddHandler cgi-script .cgi
    ScriptAliasMatch ^(.*) /usr/lib/cgi-bin/hgwebdir.cgi/$1
</VirtualHost>

Every tutorial I read on the internet tells me to insert these lines:

AuthType Basic
AuthUserFile /usr/local/etc/httpd/users

But when I do it I get the following error:

# /etc/init.d/apache2 reload
Syntax error on line 8 of /etc/apache2/sites-enabled/mercurial:
AuthType not allowed here

My distro is a customized Ubuntu called Turnkey Linux Redmine

What best practices do you use while using NGinx?