Bug#531352: Collectd - problems with netlink on x86_64
Marcos Taschelmayer
Version: 4.4.2-3
Architecture: amd64
I'm using the plugin netlink like follow:
(...)
LoadPlugin netlink
(...)
<Plugin netlink>
Interface "All"
VerboseInterface "All"
QDisc "ifb0" "prio-1:0"
(...)
#Class "ppp0" "htb-1:10"
#Filter "ppp0" "u32-1:0"
#IgnoreSelected false
</Plugin>
If I restart the collectd daemon we found a problem:
# /etc/init.d/collectd restart
Restarting statistics collection and monitoring daemon: collectdCould
not find plugin netlink.
.
This configuration works fine on i386. The problem is on amd64,
because the collectd didn't found the netlink plugin. See the follow
logs:
May 31 17:33:37 autofw collectd[6754]: Found a configuration for the
`netlink' plugin, but the plugin isn't loaded or didn't register a
configuration callback.
May 31 17:33:37 autofw collectd[6754]: Found a configuration for the
`netlink' plugin, but the plugin isn't loaded or didn't register a
configuration callback.
On i386 the plugin is available:
# dpkg -L collectd | grep netlink
/usr/lib/collectd/netlink.so
But on amd64 not:
# dpkg -L collectd | grep netlink
I'm using Debian GNU/Linux 5.0.1, kernel 2.6.26-2-amd64 and libc6
2.7-18.
Thanks in advance,
Marcos Taschelmayer
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Sebastian Harl
thanks
Hi Marcos,
On Sun, May 31, 2009 at 06:08:15PM -0300, Marcos Taschelmayer wrote:
> Architecture: amd64
[...]
> # /etc/init.d/collectd restart
> Restarting statistics collection and monitoring daemon: collectdCould
> not find plugin netlink.
Yep - that's a known problem. The netlink plugin requires libnetlink
which is only available as a static library compiled without -fPIC
(position independent code). Some (most?) architectures, like amd64, do
not allow to link such object files into shared libraries. See [1] for
some more details about this problem.
So, unfortunately, I'm currently unable to provide the netlink plugin on
those architectures. There are two ways how to resolve that issue:
Either, include libnetlink in collectd and build it with -fPIC or let
the iproute package provide a shared library as well. Including the
sources in collectd would not be hard but I don't really like that
option since that would duplicate code and efforts. I've talked to the
iproute maintainer before and he told me that a shared library would not
be an option. It might be worth talking to the iproute upstream
developers about that though - maybe they are willing to support a
shared object some time in the future which could then be included in
the Debian package as well. Do you want to give that a try?
Cheers,
Sebastian
[1] http://collectd.org/faq.shtml#faq:static_libs
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