Re: Moving a Plone installation

Am Dienstag, den 14.04.2015, 07:59 +0200 schrieb dieter:
> Wolfgang Jeltsch <[email protected]> writes:
> > ...
> > Since I assumed that the Plone installation is basically self-contained
> > (modulo a few external utilities like zlib), I thought that this
> > approach should work. However, when trying to run the Plone
> > installation, I got the error, “ImportError: No module named _md5”. What
> > is the cause of this, and how can I fix this problem?
> 
> […]
>
> In modern Python versions, the MD5 algorithm is no longer
> implemented in its own module ("_md5") but instead the one
> provided by "OpenSSL" is used (interfaced via the "hashlib"
> module ("_hashlib.so"). "_md5" is only imported when
> the available "OpenSSL" installation lacks "MD5" support.
> Thus, your problem may also indicate some "OpenSSL" problem -- e.g.
> a version problem between your Python's "_hashlib" and the OS
> OpenSSL shared object).

Yes, this seems to be the cause. The _hashlib.so links to libssl.so and
libcrypto.so with version 0.9.8, but now version 1.0.0 is installed for
both of them. How can I fix this? Can I somehow rebuild Python’s shared
library files like _hashlib.so?

> In this case, I would modernize the Python installation
> used by your Plone. In the list archive (searchable e.g.
> via "gmane") you will find advice how to do that.

Is it really necessary to get a newer Python? I would suppose that the
old Python can also link to a newer OpenSSL.

I do not like to manipulate the Python installation that is part of the
Plone installation. I have no idea what the implications would be, for
example, regarding security support.

All the best,
Wolfgang


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