05-28-2009
Cygwin <--> CMD App Problem (Terminal Type?)
I'm not sure if this is the right place to post this, but here it is. We have a nightly process that runs on an HP-UX box to stop our application and backend database servers, unmount their SAN hosted file systems, and then snapshot the SAN LUNs for backup and refresh of data on "report" and "test" systems. For the past five years it's all been done on the HP-UX side. But the new EVA4000 SAN we just moved to was purchased with a Windows 2003 server as the SAN manager.
We still need the snapshot creation/deletion managed from the HP-UX side. So to try and get this to happen, I installed Cygwin on the box. OpenSSH, Bash, and Vim were selected components. I got OpenSSH working great with the auth keys. I also am able to run many Windows CLI commands from the default Bash shell, or if need be set CMD.exe up as a shell for the SSH session. The problem is when I attempt to run the HP Commandview EVA "SSSU.EXE" command. The prompt goes away and there is no output from the app. I have to Ctrl-C to get out and sometimes an image of SSSU.EXE is left running on the system.
If I run SSSU from Bash on the Windows box itself, it also does the same thing. However, if I run it from CMD.EXE on the Windows box, it works. So I tried replacing the shell for the SSH login with CMD.EXE and SSSU still fails. As a test I tried running MS 'EDIT' in CMD directly on the box. That works as expected. But in Bash, or over OpenSSH, it behaves the same way the SSSU does.
What I suspect is happening is that both EDIT and SSSU expect something that only the CMD shell provides when executed locally. Likely some form of console or tty that Cygwin doesn't provide. So my question is... what might these applications be expecting that Cygwin isn't providing?
I wasn't sure whether to post this here or to the Windows mailing list I belong to. It feels kind of halfway between the Windows and *nix worlds.
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LEARN ABOUT DEBIAN
catalyst::manual::deployment::fastcgi
Catalyst::Manual::Deployment::FastCGI(3pm) User Contributed Perl Documentation Catalyst::Manual::Deployment::FastCGI(3pm)
NAME
Catalyst::Manual::Deployment::FastCGI - Deploying Catalyst with FastCGI
FastCGI Deployment
FastCGI is a high-performance extension to CGI. It is suitable for production environments, and is the standard method for deploying
Catalyst in shared hosting environments.
Pros
Speed
FastCGI performs equally as well as mod_perl. Don't let the 'CGI' fool you; your app runs as multiple persistent processes ready to
receive connections from the web server.
App Server
When using external FastCGI servers, your application runs as a standalone application server. It may be restarted independently from the
web server. This allows for a more robust environment and faster reload times when pushing new app changes. The frontend server can even
be configured to display a friendly "down for maintenance" page while the application is restarting.
Load-balancing
You can launch your application on multiple backend servers and allow the frontend web server to perform load-balancing among all of them.
And of course, if one goes down, your app continues to run.
Multiple versions of the same app
Each FastCGI application is a separate process, so you can run different versions of the same app on a single server.
Can run with threaded Apache
Since your app is not running inside of Apache, the faster mpm_worker module can be used without worrying about the thread safety of your
application.
Widely supported.
FastCGI is compatible with many server implementations, not just Apache.
Cons
You may have to disable mod_deflate. If you experience page hangs with mod_fastcgi then remove deflate.load and deflate.conf from
mods-enabled/
More complex environment
With FastCGI, there are more things to monitor and more processes running than when using mod_perl.
Standalone FastCGI Server
In server mode the application runs as a standalone server and accepts connections from a web server. The application can be on the same
machine as the web server, on a remote machine, or even on multiple remote machines. Advantages of this method include running the
Catalyst application as a different user than the web server, and the ability to set up a scalable server farm.
To start your application in server mode, install the FCGI::ProcManager module and then use the included fastcgi.pl script.
$ script/myapp_fastcgi.pl -l /tmp/myapp.socket -n 5
Command line options for fastcgi.pl include:
-d -daemon Daemonize the server.
-p -pidfile Write a pidfile with the pid of the process manager.
-l -listen Listen on a socket path, hostname:port, or :port.
-n -nproc The number of processes started to handle requests.
See below for the specific web server configurations for using the external server.
WEB SERVERS
Any web server which supports FastCGI should work with Catalyst. Configuration recipies for well-known web servers are linked below, and we
would welcome contributions from people deploying Catalyst on other web servers.
Apache
Catalyst::Manual::Deployment::Apache::FastCGI
nginx
Catalyst::Manual::Deployment::nginx::FastCGI
lighttpd
Catalyst::Manual::Deployment::lighttpd::FastCGI
Microsoft IIS
Catalyst::Manual::Deployment::IIS::FastCGI
AUTHORS
Catalyst Contributors, see Catalyst.pm
COPYRIGHT
This library is free software. You can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.14.2 2012-01-20 Catalyst::Manual::Deployment::FastCGI(3pm)