Installation of r8168 network driver
http://wiki.hetzner.de/index.php/Installation_of_r8168_network_driver
The Linux driver r8169 for the Realtek network chip in the EQ servers does not work correctly in CentOS 5.4, Ubuntu 9.04, OpenSUSE 11.1 and Debian Lenny. Timeouts and state changes to link down may occur. The solution is to use the official Realtek r8168 driver. Unfortunately this driver is not yet included in any distribution. For CentOS it can be installed from 3rd party repositories. For Debian and Ubuntu it must be compiled by the user.
This article describes how to setup the network driver.
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Using kmod-r8168 from elrepo.org on CentOS
ELRepo is a RPM repository for Enterprise Linux packages. ELRepo supports Red Hat Enterprise Linux and its derivatives (CentOS, Scientific Linux and others). It is the easiest way to get the r8168 driver for the standard upstream kernels.
NOTE: If you are using a special kernel like Virtuozzo, OpenVZ or something similar. You MUST compile the module yourself!
To install ELRepo for RHEL5, CentOS-5 or SL5:
rpm -Uvh http://elrepo.org/elrepo-release-0.1-1.el5.elrepo.noarch.rpm
Import the public key:
rpm --import http://elrepo.org/RPM-GPG-KEY-elrepo.org
To install kmod-r8168 Realtek r8168 driver:
yum --enablerepo=elrepo install kmod-r8168
After reboot the new driver is used. It stays active even after kernel upgrades.
Using r8168-kmp from the OpenSUSE 11.1 NIC drivers repo
OpenSUSE offers prebuilt Kernel module packages (kmp). You just have to add the repository to zypper and install the matching package. In the example the -default kernel is assumed
cd /etc/zypp/repos.d wget http://download.opensuse.org/repositories/drivers:/nic/openSUSE_11.1/drivers:nic.repo zypper install r8168-kmp-default
Before rebooting, the r8169 must be blacklisted.
echo "blacklist r8169" >> /etc/modprobe.d/blacklist
After the reboot only the r8168 module should show up in 'lsmod'
Installation from source
Prerequisites
Please make sure you are running the latest kernel available with yum or apt-get.
CentOS
On CentOS the packages 'kernel-devel' and 'kernel-headers' will install headers only for the newest kernel. The following packages need to be installed via the package manager:
yum install gcc gcc-c++ kernel-devel kernel-headers
Debian/Ubuntu
On Ubuntu the name of the header package depends on the selected kernel. It can be for example 'linux-headers-generic' or 'linux-headers-server'. Both will install headers only for the newest kernel. The following package will install everything required for compilation (as root):
aptitude install build-essential linux-headers-`uname -r`
Getting the sources
cd /tmp wget http://download.hetzner.de/drivers/r8168-8.015.00.tar.bz2 tar xjf r8168-8.015.00.tar.bz2
Compiling the driver
cd r8168-8.015.00 make all
Activating the new driver
CentOS
The file /etc/modprobe.conf needs to be edited. Change the line
alias eth0 r8169
to
alias eth0 r8168
To activate the new driver, we create a simple shell script that does the necessary steps.
echo "rmmod r8169" > /tmp/r8168 echo "depmod -a" >> /tmp/r8168 echo "modprobe r8168" >> /tmp/r8168 echo "service network restart" >> /tmp/r8168 echo "service ipaliases restart" >> /tmp/r8168
Execute that script:
sh /tmp/r8168
After several seconds the server should be back online using the new network driver. Our working directory can now be removed:
rm -rf /root/r8168
Debian Lenny / Ubuntu 9.04
After installing the driver, update the module dependencies.
depmod -a
First the r8169 network driver needs to be blacklisted in order to prevent the kernel from loading it.
Ubuntu: echo "blacklist r8169" >> /etc/modprobe.d/blacklist.conf Debian: echo "blacklist r8169" >> /etc/modprobe.d/blacklist
Then we force the kernel to include the driver in the initrd.
echo "r8168" >> /etc/initramfs-tools/modules
And rebuild the initrd
update-initramfs -v -u -k `uname -r`
Now you can reboot to activate the driver.
After a kernel update the driver might need to be recompiled.
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