02-17-2020
Quote:
I'm not inclined to install an application which relies on HTTP at the data transport layer to monitor a LAMP application where HTTP and apache2 are at the core of the problem. However, for a different scenario, an HTTP-transport based monitoring system might be "just the ticket".
I'm not sure if you understood it right. Prometheus is getting the Performance data via http, that's correct, but it does not use the installed http-server which is serving normal http requests. That obviously would be senseless for the reason you mentioned.
That data provisioning is done by
exporters which are tiny lightweight webservers running standalone on the target systems. Like the apache exporter(see
here). And well - "lightweight" might be a bit irritating label for a binary with 12 MB size, but as it is
go it is statically compiled that's a bit different from a normal dynamically linked executable.
The apache exporter fetches data from apache status module and listens on port 9117 by default.
Last edited by stomp; 02-17-2020 at 12:56 PM..
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LEARN ABOUT SUSE
tnm::http
http(n) Tnm Tcl Extension http(n)
__________________________________________________________________________________________________________________________________________________
NAME
http - Send and process HTTP requests.
_________________________________________________________________
DESCRIPTION
The Hypertext Transfer Protocol (HTTP) (RFC 1945) is a client/server protocol used to retrieve documents in the World Wide Web. Documents
are addressed using Uniform Resource Locators (URL) (RFC 1738). The http command allows to implement HTTP clients and a simple HTTP server.
HTTP COMMAND
The following list of http commands is useful for HTTP clients:
http proxy [url]
The http proxy command allows to define a proxy HTTP server which will be used in subsequent client commands. Using this command
without an url argument will return the URL to the currently used proxy or an empty string. Providing a url argument sets the proxy
server. Setting the proxy to an empty string turns the proxy feature off.
http head url
The http head command retrieves the HTTP header for the document located at url. The header is returned as a list of keys and values
which can be converted into a Tcl array using the array set command.
http get url fileName
The http get command retrieves the document located at url. The body of the document is written to the file named fileName. The com-
mand returns the HTTP header as described for the http head command above.
http post url docFileName fileName
The http post command posts the document in docFileName to the location url. The body of the returned document is written to the
file named fileName. The command returns the HTTP header as described for the http head command above.
http put url docFileName
The http put command puts the document in docFileName to the location url. The command returns the HTTP header as described for the
http head command above.
http delete url
The http delete command deletes the document at the location defined by url. The command returns HTTP status information.
The following set of http commands is useful for a simple HTTP server:
http server [port]
The http server command starts a simple HTTP server listening on port port. If called without a port argument, the currently used
port number or an empty string is returned. An empty string indicates that no server is currently active.
http mime type extension
The http mime command is used to add mime type definitions to the internal table which maps file name extension to mime types. If
called without an argument, the list of all mime type mappings is returned. A new mapping is created by supplying a mime type and
the file name extension.
http bind pattern method [script]
The http bind command binds a Tcl script to the invocation of a HTTP method where the URL matches pattern. Whenever a HTTP request
of type method is received that matches the pattern, script is evaluated. The return value of the script must be a name of a file
which will be send back to the client. Errors during the evaluation of the script will result in an error response.
The following % sequences are substituted before a script bound to a URL is evaluated:
%A The network address of the client.
%P The URL path requested by the client.
%S The search path contained in the URL path.
SEE ALSO
scotty(1), Tnm(n), Tcl(n)
AUTHORS
Juergen Schoenwaelder <schoenw@cs.utwente.nl>
Tnm http(n)