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Up to now we've dealt with and configured in genetics to serve static files of various types leaving

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the rendering of that file to be handled by the client or browser based on its content type or MIME

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type.

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Now while serving static files is great a critical part of most web servers is the ability to serve

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dynamic content that's been generated from a server side language such as P. HP.

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If you recall from the first section of this course I mentioned that engine X isn't able to embed its

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server side language processors so instead then we'll configure a standalone BHB service namely p p

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if P. M. to which engine X will pass the request for processing and then upon receiving the response

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typically has h.t. amelle return there to the client.

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This is essentially engine X functioning as a reverse proxy server.

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One of the strong points but we'll dig into that specific topic later on in the course.

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Step one then is to actually install the page b f P. M. service.

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We can safely use our package manager to do this.

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So again UPDATE AP t..

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Just good practice.

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And once that's done run apt get install the HP F. P. M. which will install the latest stable release

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of BHP fbm available to a peaty which we can see here happens to be BHB seven point one confirm.

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Fast forward through this and all done now.

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As with most services we install using a p t p s p f P. M. is very conveniently already configured as

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a system D service.

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Same as we've done for engine X which we can see happened year as Patch B seven point one dash F. P.

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M..

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Not just pitch b f be m as we installed it.

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This version number being a common naming convention of BHB just in order to have multiple versions

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in use at once.

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Should that be a requirement for development or testing.

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We can confirm that the service exists by listing all the system D services system C T L list units

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filtering the results with grep for anything containing be and there we have it.

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As expect it be B seven point one f P. M..

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Check the status of our newbie HP Service System C T L status.

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B seven point one dash F be M which is already running a single master process and two workers.

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So with B F be m running and ready to process page B requests Let's head over to engine next hour conf

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and configure the passing of our appear to be files to this service.

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First addition to this file is the inclusion of the index directive.

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This being a standard directive which tells engine X which file to load if the request point to a directory

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the default so the current value being indexed to HD moul.

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Hence why when we request our domain slash indexed or HDMI loads route Plus this index value.

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This like the try files.

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DirecTV can take multiple arguments in order of importance.

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So with the inclusion of BHB we'll typically want to serve index Dogpatch P first if it exists in a

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directory and if not.

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Secondly look for indexed or h.t. amelle the default.

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This by no means being a hard and fast rule but the most likely configuration when dealing with a to

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be based project.

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Next I'll get rid of this location create a new one for Slash So a prefix match for anything in which

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we're going to try it with try files the request that you are by then.

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Alternatively the requested you are I with an add a trailing slash in case it maps to a directory with

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either indexed of BHB or indexed dot aged here Mel.

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And finally if none of these exist go back to the default engine next foro for which we can write with

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equals forro for.

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So this location will take care of any requests for static content.

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Meaning that in a second location block using a regular expression match so it will take priority over

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this prefix match.

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We can match anything ending in dot BHB like so in order to pass a 2p edge.

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P if P. M..

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Which will do.

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By means of the fast CGI protocol.

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If you're not familiar with fast CGI I've linked to some information in the list and resources but essentially

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it's a protocol like HTP for transferring binary data.

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You don't need to understand this but just know that it's how engine X will communicate with B.

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B F p. m..

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We could have done this using the standard htb Protocol also.

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But fast CGI is slightly faster before we pass requests in this location context to be a.

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B f be m however we still need to include some other configuration parameters.

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Luckily as with our MIME types.

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Engine X provides a very good include with fast g.g. I preconfigured you might have spotted it during

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the installation but to double check.

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It's located at slash ATC slash engine X fast CGI dot conf.

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So in the same directory as the engine start con file meaning we can again just reference it relative

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to this file fast CGI dot conf then to pass this request to be a b f P. M. using fast e.g. I say FAST

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C I underscore pass and what we want to pass this to is a Unix socket created by page pfb M..

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Think of a socket as an HTP port a file on which a service can listen for binary data.

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Hence the use of fast CGI as a protocol.

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Again understanding the fast CGI protocol and Unix sockets is by no means required for understanding

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how to configure BHB within generics.

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But it's good to at least get an overall understanding of what's happening and why it's done like this

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to indicate that this endpoint is a Unix socket.

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Then we can say Unix colon and the location of that socket.

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In this case it's going to be located at slash run slash BHB slash BHB seven point one dash.

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If B M dot soc.

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I'll show you how to find the socket location for your install in a second.

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Save this over to the terminal and before we reload this engine XT configuration we can make sure the

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HP fbm socket is in fact at that location.

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By searching for it I'll use the find command.

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Look in the root of this machine.

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So searching everything by name and we'll search for any thing ending worth F be M dot shock enter and

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found at that exact location.

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As I've configured engine X so knowing that's correct reload engine X configuration.

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We still don't have any BHB files to test this worth so we'll create a simple test file.

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Just write the contents directly to our new page B file.

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Make it BHB opening statement calling BHB info close BHB to slash sites slash demo slash info Dogpatch

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be.

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If you're not familiar with BHB this is just saying start processing the content as patch.

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Be here call the BHB info function which is a native P P function for displaying all of page piece configuration

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information and stop processing BHB which wasn't really necessary as the file ends here.

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Anyway it over to the browser so we can test this.

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I'll just reload the demesne without any path and we get that same indexed to htl page from the demo

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directory.

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This of course being as we've named the BHB file info dot BHP meaning on this root directory request

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engineer is first checking for indexed or HP which isn't found then for indexed or HDL and serving the

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old demo page.

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This request also not containing a BHB extension.

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Hence not being matched on the BHB location.

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Change this request for info Dogpatch.

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However meaning will match on the BHB location and we get this error 5 0 too bad gateway.

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This being a prime example of when engine x error logs can really help out check the very last entry

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of the error log with tail and N flag one meaning one line of the end of this file var log.

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Engine x error log critical error connecting to Unix socket slash run slash B.

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B B.

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B seven point one.

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If B em sock with the reason engine x cannot connect to the socket being permission denied.

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A very common situation in this case.

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We can very quickly find the reason for this permissions error by checking the user with which the engine

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XT process is running the worker process here.

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Nobody which is the default for change and X and the p p if P. M. process w w w dashed data.

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Meaning this nobody user does not have permission to appear to be fbm socket.

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There is of course a number of ways we can solve this including changing the permissions of the socket.

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But the most secure and easiest way by far is to configure engine X to run as the same user w w w dash

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data in the configuration file.

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Simply add in the main context user w w w dashed data safe.

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Reload engine x.

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Check that process again which is now correctly running as w w w desch Data reload info Dogpatch.

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Be in the browser and it works.

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We get that full output of the BHB info function meaning engine X received the request matched it on

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the BHB location past that to the pier.

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B if B MS service where it was processed and passed back to engine X which in turn then served that

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processed response to us.

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One last point to cover is this index directive with indexed or appear to be as the priority.

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Let's create an index stoppage be file in that demo directory again.

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I'll write some content directly to at Echo a h one date.

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Then as beatch be echo the date function with a format of day of the week L..

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Day of the month.

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J.

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Capital S and month.

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F.

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End p.

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P processing.

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And close that each one statement.

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Writing there to slash sites.

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Slash demo slash indexed iph be back in the browser.

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Remove the request path.

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So previously serving indexed old h.t. a email and we get that indexed iph page instead.

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Meaning this indexed directive prioritized.

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Oh a new page B page over there h.t. a mail one that wraps up the basics of configuring a server side

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language process for INJ annexe.

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But be sure to check out all the links in the lesson and resources for more advanced configurations

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and implementations.