06-02-2011
need advice on AIX virtualization
Hi all,
first of all, beg your pardon for dummy questions. Please help me to sort it out.
I'm an internal consultant in a technology unit, and currently we are relocating some applications to another Data Center. In the old Data Center, applications are running on IBM AIX, mostly AIX 5.3. The IT team is saying that all these applications are virtualized.
We want to buy new servers in another Data Center for these applications. AIX 5.3 is already end of marketing, i.e. we cannot buy a new server with AIX 5.3. My IT department is saying that this means that we necessarily need to hire system integrators to migrate applications to AIX 6. That is quite expensive.
I don't quite understand their statement. I thought that if application is virtualized, you don't really care what is the version of the host OS. I.e. we can buy a new server with AIX 6.0 for the new Data Center and still run AIX 5.3 on it as a guest OS, without migrating the application.
Please let me know where the truth is. Many thanks!
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LEARN ABOUT SUSE
cgi-fcgi
NAME
cgi-fcgi - bridge from CGI to FastCGI
SYNOPSIS
cgi-fcgi -f cmdPath
cgi-fcgi -bind -connect connName
cgi-fcgi -start -connect connName appPath [nServers]
cgi-fcgi -connect connName appPath [nServers]
DESCRIPTION
cgi-fcgi is a CGI/1.1 program that communicates with an
already-running FastCGI application in order to respond to
an
HTTP request. cgi-fcgi is also capable of starting a FastC-
GI
application.
When you invoke cgi-fcgi as
cgi-fcgi -f cmdPath
then cgi-fcgi opens the file at cmdPath and reads its
arguments from that file. cgi-fcgi will skip lines
that begin with the comment character #. The first
non-comment line should contain valid arguments in
one of the other three forms.
The -f form of cgi-fcgi is designed for Unix systems
whose exec(2) family of system calls supports the execution
of
command interpreter files. For instance, if a file with
execute permission contains the text
#! /bin/cgi-fcgi -f
-connect /httpd/root/sock/app /httpd/root/bin/app
the effect is the same as executing
/bin/cgi-fcgi -connect /httpd/root/sock/app
/httpd/root/bin/app
When you invoke cgi-fcgi as
cgi-fcgi -bind -connect connName
the connName argument is either the path name of a Unix do-
main
listening socket or a host:port pair. If connName contains
a colon, it is assumed to be host:port. cgi-fcgi performs
a connect(2) using connName. If the connect succeeds, cgi-
fcgi
forwards the CGI environment variables and stdin data to the
FastCGI application, and forwards the stdout and stderr data
from
the application to cgi-fcgi's stdout (most likely connected
to
a Web server). When the FastCGI application signals the end
of
its response, cgi-fcgi flushes its buffers and
exits, and the Web server completes the http response.
When you invoke cgi-fcgi as
cgi-fcgi -start -connect connName appPath [nServers]
then cgi-fcgi performs the function of starting one or more
FastCGI application processes. The connName argument speci-
fies
either the path name of the Unix domain listening socket
that
cgi-fcgi will create, or is "localhost:NNN" where NNN is the
port
number of the TCP/IP listening socket that cgi-fcgi will
create
on the local machine. (cgi-fcgi will not create processes
on remote machines.) After cgi-fcgi creates the listening
socket,
it forks nServers copies of a process running the executable
file
appPath. If nServers is omitted, the effect is as if the
value "1"
had been specified. The processes share the single listen-
ing socket.
When you invoke cgi-fcgi as
cgi-fcgi -connect connName appPath [nServers]
cgi-fcgi performs -bind and then, if necssary, performs
-start
and repeats the -bind. That is, cgi-fcgi first operates as
if
the command had been
cgi-fcgi -bind -connect connName
If the connect fails, cgi-fcgi tries
cgi-fcgi -start -connect connName appPath [nServers]
and finally retries
cgi-fcgi -bind -connect connName
In this form, cgi-fcgi does not support TCP/IP connections.
ENVIRONMENT VARIABLES
The usual CGI ones, but they are not interpreted by cgi-fc-
gi.
SEE ALSO
FGCI_accept(3)
BUGS
cgi-fcgi doesn't generate useful HTTP responses in case of
error,
and it generates no response at all when run as start-fcgi.
On Digital UNIX 3.0 systems the implementation of Unix Do-
main
sockets does not work when such sockets are stored on NFS
file
systems. Symptom: cgi-fcgi may core dump or may exit with
status 38. Work-around: store sockets in local file systems
(/tmp often works) or use TCP/IP.
On AIX systems the implementation of listening sockets
does not support socket sharing, and the standard FastCGI
application libraries can't synchronize access to AIX lis-
tening
sockets. Work-around: Don't use the nServers argument on
AIX.
HISTORY
Copyright (c) 1996 Open Market, Inc.
See the file "LICENSE.TERMS" for information on usage and
redistribution
of this file, and for a DISCLAIMER OF ALL WARRANTIES.
$Id: cgi-fcgi.1,v 1.1.1.1 1997/09/16 15:36:26 stanleyg Exp $