I'm trying to install the munin-mysql plugin but I'm facing a strange error. Munin complains that it cannot find DBI.pm in the @INC:
[root@mybox perl5]# munin-run mysql
Can't locate DBI.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /etc/munin/plugins/mysql line 127.
BEGIN failed--compilation aborted at /etc/munin/plugins/mysql line 127.
However, it is indeed in the path, and precisely at /usr/local/lib64/perl5. It was installed via the command cpanm DBI.
In fact, there are several DBI.pm files; how do I know which one is to be used?
[root@mybox perl5]# find / -name DBI.pm
/root/.cpan/build/DBI-1.634-Aazmvi/blib/lib/Bundle/DBI.pm
/root/.cpan/build/DBI-1.634-Aazmvi/blib/lib/DBI.pm
/root/.cpan/build/DBI-1.634-Aazmvi/lib/Bundle/DBI.pm
/root/.cpan/build/DBI-1.634-Aazmvi/DBI.pm
/root/.cpanm/work/1460983027.32244/DBI-1.634/blib/lib/Bundle/DBI.pm
/root/.cpanm/work/1460983027.32244/DBI-1.634/blib/lib/DBI.pm
/root/.cpanm/work/1460983027.32244/DBI-1.634/lib/Bundle/DBI.pm
/root/.cpanm/work/1460983027.32244/DBI-1.634/DBI.pm
/root/munin-mysql-master/t/mock/DBI.pm
/usr/local/lib64/perl5/Bundle/DBI.pm
/usr/local/lib64/perl5/DBI.pm
Related questions:
munin-run switches users. The default user is nobody. That user probably does not have permission to read the file.
The script must be run with sufficient privileges, usually as root, as it switches to either munin-node's default user (often "nobody") or any user specifically configured to run the given plugin.
Check with munin-run --debug what user it's running as and check that user can read /usr/local/lib64/perl5/DBI.pm.