apache2: Perl lib 版本 (5.28.1) 与可执行文件 '/usr/sbin/apache2' 版本 (5.20.2) 不匹配

Question

I have installed Debian 10 in order to migrate a web server from one machine to this Debian 10 machine. The web server built on apache2 needs mod_perl. The module was not found on the new machine, so I installed perl5.28 (and mod_perl.so has been added). But now it seems there is a mismatch between a previous perl version (5.20) and the latest one (5.28). I use the perl binary correspondint to v5.28, @INC contains directories related to v5.28 (according to "env -i perl -V"). But when I try to start the apache2 server, I get this error: "apache2: Perl lib version (5.28.1) doesn't match executable '/usr/sbin/apache2' version (5.20.2)". Can anyone help? Thanks a ton in advance.

Answer 1

When you built apache with mod_perl, you used v5.20, but it seems that's not around anymore. Different versions of Perl are not guaranteed (or even attempt to be) binary compatible. Between Perl versions, you'll likely have to re-compile all XS modules, too.

You need to recompile apache with the Perl that you want to use, or install the Perl that apache wants to use. This time you may want to statically compile mod_perl into apache.

This problem isn't specific to Perl, though. Many software libraries will complain similarly when you replace the library they compiled against.