Just to add another approach, you can use a separate file for each virtual domain or site you're hosting.
You can use a copy of default as a starting point for each one and customize for each site.
Then create symlinks in sites-enabled. In this way you can take sites up and down just by adding or removing a symlink and issuing a service nginx reload.
You can get creative and use this method to redirect sites to a maintenance mode page while you are doing site maintenance.
So the structure looks like this:
/sites-available/ (you can use obvious file names like this)
|
|-> a.mysite.com
|-> b.mysite.com
|-> someOtherSite.com
/sites-enabled/ (these are just symlinks to the real files in /sites-available)
|
|-> a.mysite.com
|-> b.mysite.com
Notice that since there are only the first two entries are the only symlinked items in sites-enabled
, the third entry, someOtherSite.com
is therefore offline.
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