[EHPweb] ehpmaster AND ehpbackup

[Jeremy M Fee]

Hi Pete,


> What is the significance of ehpmaster and ehpbackup for those of us  
> who may
> someday use ProductClient to push web products to you?

The significance of ehpmaster and ehpbackup is the same, regardless of  
how the content gets there.  Both are "master" web servers that  
process realtime content and replicate it to "public" web servers.

The advantage of using the ProductClient is you don't need to know  
about ehpmaster and ehpbackup.  You send your content to PD hubs,   
which provide redundant delivery paths to our master web servers.   
This means you don't reconfigure if/when we change our web server  
addresses/locations.  Additionally, anyone else listening to PD can  
receive your products directly, not just via our web servers.


> It would be nice if there was some documentation of how your EHP web  
> system works.

For more documentation of how our web system works, take a look at our  
wiki (assuming fws allow it, if not talk to Chris Bidwell).   
Specifically these pages:
	https://ehptools.cr.usgs.gov/trac/wiki/webserver_architecture
	https://ehptools.cr.usgs.gov/trac/wiki/optimization
If something on the wiki is unclear, let us know so we can fix it.


> By the way, I am still not able to connect to ehpdevel.cr.usgs.gov  
> port 11235 from Berkeley machines.

As for PDL firewalls, we have DOI/ESN's blessing and ITSOT claims they  
have implemented the changes (as of minutes ago).  Please try again.


Thanks,

Jeremy