Mailing List Archive: ModPerl: ModPerl

Apache 1.3 -> 2.x portability

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thefatphil at yahoo

Nov 14, 2008, 5:26 AM

Post #1 of 6 (681 views)
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Apache 1.3 -> 2.x portability

I'm currently running only Apache 1.3 (mod_perl 1.22) and am wondering what kinds of issues there might be if I were to want to migrate my server to Apache 2.x and mod_perl 2.

Are there any things that I can do (or avoid) to make such a migration as close to trivial as possible.

Phil
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mpeters at plusthree

Nov 14, 2008, 5:47 AM

Post #2 of 6 (632 views)
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Re: Apache 1.3 -> 2.x portability [In reply to]

Phil Carmody wrote:
> I'm currently running only Apache 1.3 (mod_perl 1.22) and am wondering what kinds of issues there might be if I were to want to migrate my server to Apache 2.x and mod_perl 2.
>
> Are there any things that I can do (or avoid) to make such a migration as close to trivial as possible.

http://perl.apache.org/docs/2.0/user/porting/compat.html

The biggest problem that I've seen is that not all of the Apache:: modules on CPAN have been ported
to Apache2 or been setup to work for both. Most of the big ones have so it depends on what you're
using. And it's not that hard to port one of them if you need to.

--
Michael Peters
Plus Three, LP

adam.prime at utoronto

Nov 14, 2008, 6:07 AM

Post #3 of 6 (640 views)
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Re: Apache 1.3 -> 2.x portability [In reply to]

aw at ice-sa

Nov 14, 2008, 6:10 AM

Post #4 of 6 (640 views)
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Re: Apache 1.3 -> 2.x portability [In reply to]

Michael Peters wrote:
> Phil Carmody wrote:
>> I'm currently running only Apache 1.3 (mod_perl 1.22) and am wondering
>> what kinds of issues there might be if I were to want to migrate my
>> server to Apache 2.x and mod_perl 2.
>> Are there any things that I can do (or avoid) to make such a migration
>> as close to trivial as possible.
>
> http://perl.apache.org/docs/2.0/user/porting/compat.html
>
> The biggest problem that I've seen is that not all of the Apache::
> modules on CPAN have been ported to Apache2 or been setup to work for
> both. Most of the big ones have so it depends on what you're using. And
> it's not that hard to port one of them if you need to.
>

Another few tips :
Use the latest Perl, the latest Apache2, and the latest mod_perl2 you
can find. That is to avoid another round of renaming.
Then, install this preferably on a new system, do not overwrite your
Apache1 stuff.
Start with a clean Apache2 config, and bring over your customised
configuration bits and associated modules little by little. Do not try
to copy over your http.conf from 1 to 2, and correct it, that will only
bring you misery.
As Michael said, use the Apache2 versions of the modules if they are
available; if they are not, anyway use the latest versions you can find.
Things like CGI are no problem.
If you have developed your own modules in pure perl, usually it boils
down to fixing the "use Apache::xxxx" to "use Apache2::xxxx", but there
are some more things. If you do it gradually, you will quickly learn
what to look for, and it will take less time in the end.

If you are doing this under Linux, you may want to make sure that you
have a relatively recent version to start with. Otherwise, if you use
the package manager to install the software, it may install some
outdated versions, and you'll find your self having to redo things again.

Paul.Paskvan at csu

Nov 14, 2008, 7:26 AM

Post #5 of 6 (641 views)
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Re: Apache 1.3 -> 2.x portability [In reply to]

I am attempting to use Apache2::compat on a dedicated windows to get an old open source application, that does run under apache1/mod-perl1, running. Hopefully, I can easily port this application, or is it easier to give up?

>>> Adam Prime <adam.prime [at] utoronto> 11/14/2008 8:07 AM >>>
Michael Peters wrote:
> Phil Carmody wrote:
>> I'm currently running only Apache 1.3 (mod_perl 1.22) and am wondering
>> what kinds of issues there might be if I were to want to migrate my
>> server to Apache 2.x and mod_perl 2.
>> Are there any things that I can do (or avoid) to make such a migration
>> as close to trivial as possible.
>
> http://perl.apache.org/docs/2.0/user/porting/compat.html
>
> The biggest problem that I've seen is that not all of the Apache::
> modules on CPAN have been ported to Apache2 or been setup to work for
> both. Most of the big ones have so it depends on what you're using. And
> it's not that hard to port one of them if you need to.
>

There are also some details about porting from libapreq1
(Apache::Request) to libapreq2 (Apache2::Request) that are mentioned at
the bottom of this page:

http://httpd.apache.org/apreq/docs/libapreq2/group__apreq__xs__request.html

There's another thing that isn't currently mentioned as well, which is
that my @params = $r->param() under libapeq2 no longer returns a
unique'd list of params. on a request like ?a=b&a=c, it will return (a,
a). under apreq1 it returned (a).

Adam

eric.berg at barclayscapital

Nov 18, 2008, 6:32 AM

Post #6 of 6 (601 views)
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RE: Apache 1.3 -> 2.x portability [In reply to]

We have a bunch of registry/CGI tools that exec external apps, including
Autosys CLI tools and CVS. The problem is that, whereas in 1.3 the
environment was passed to the spawned process, in 2.0, that's not the
case.

We had to make use of Env::C and the Apache2::SubRequest mods to allow
us to successfully port these tools.

Not much is made of it in the docs, but it was a huge issue for us.

Eric

> -----Original Message-----
> From: Phil Carmody [mailto:thefatphil [at] yahoo]
> Sent: Friday, November 14, 2008 8:26 AM
> To: modperl [at] perl
> Subject: Apache 1.3 -> 2.x portability
>
> I'm currently running only Apache 1.3 (mod_perl 1.22) and am
> wondering what kinds of issues there might be if I were to
> want to migrate my server to Apache 2.x and mod_perl 2.
>
> Are there any things that I can do (or avoid) to make such a
> migration as close to trivial as possible.
>
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