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README for Plack FCGI interface for LedgerSMB Chris Travers 2012-11-13 ---------------- WARNING: Plack support for LedgerSMB is still designated as "expermental" which means that it may have bugs not found in the core distribution. Serious bugs in this area were fixed as recently as 1.3.25. Use at your own risk. In addition, persistant code environments are more sensitive generally than the CGI environments and when the script dies one does not always get a helpful error. In particular, blank, white screens are typical of the software exiting before the standard output is returned to the web server. There have been cases (which have been corrected) which caused these kinds of errors under plack only. ---------------- This addon provides an app.psgi for LedgerSMB which allows you to properly run servelets as fcgi scripts instead of as CGI scripts. This makes LedgerSMB significantly more responsive but performance is more difficult to manage under load. The current module preloads a fair number of modules and then runs a fork/wait/execute loop where the less safe code is run. This performs well on platforms which provide copy on write functionality, but may not perform as well on Windows. The startup overhead for the dependencies is thus limited in this case to a one-time load on starting the servelet. Tests suggest that this eliminates 2/3 or more of the startup overhead. This module has been tested on fcgi backends but has not been tested on other backends. I know of no reason it shouldn't work on starlet and other backends, so if it works for you, please let us know. The preloads are all set in the app.psgi. You can adjust them there. Note that preloaded modules are not reloaded when altered so you will have to restart the fcgi daemon if you change the preloads. One solution is that for a performance cost you can comment out a preload, and restart the daemon when working on a preloaded module. Currently this will preload configuration settings so changes to the ledgersmb.conf will require a restart. By default this currently starts up to 10 processes. This number can be tweaked. To run the servelet, you will need to run the following from a startup script somewhere: plackup -s FCGI -D --listen /var/run/httpd/fastcgi/lsmb.sock We have also packaged a few utilities here that are helpful, and these are included in the tools/system directory. These include lsmbstart and lsmbstop, both bash scripts designed to start and stop the fcgi processes. We also include ledgersmb.service which is a systemd config file for systemd systems (including Fedora) to use in starting/stopping the service. A Sys V init script is not currently included but that is likely to be in future versions (contributions welcome).