Monthly Archives: July 2014

Intel E1G42ET (82576 controller) SR-IOV with Windows 2008 R2 guest

I've followed the Redhat Enterprise Linux 7 Using SR-IOV guide, with the following changes made for Ubuntu 14.04 and the fact that the Intel driver set (PROWinx64) doesn't install the drivers automatically.

Make sure to bring the network link state up before you start the virtual machine, or the network driver will report "Network cable unplugged" permanently. igbvf doesn't want to detach on Linux 3.10 on Ubuntu 14.04, so I have blacklisted the module.

/etc/modprobe.d/blacklist-igbvf.conf

blacklist igbvf

/etc/modprobe.d/igb.conf

options igb max_vfs=7

Download the latest Intel Virtual Function drivers from the Intel site, extract PROWinx64 with your favourite archival program. Then run the following command:

pnputil -a PRO1000\Winx64\NDIS62\v1q62x64.inf

Then you can either go to Device Manager and scan for New hardware changes or restart the virtual machine. Your guest networking should now be working.

Ansible: Package manager agnostic task

Want to have install packages in an agnostic way (eg. apt, yum, etc.) if all the package names are the same – regardless of the system? There are two ways to do it.

Use an action, and iterate over each package

- action: "{{ansible_pkg_mgr}} name={{item}} state=latest"
  with_items:
   - ntp
   - acpid
   - haveged
   - irqbalance
   - nano
   - screen
   - wget
   - sysstat

Concatenate list and pass to package manager module

For the fast way, as all package manager modules support passing package names as a comma separated list (which will be executed in one go by the module – the faster way)

Site definition

  vars:
    default_packages:
     - ntp
     - acpid
     - haveged
     - irqbalance
     - nano
     - screen
     - wget
     - sysstat

Task

- action: "{{ansible_pkg_mgr}} name={{default_packages|join(\",\")}} state=latest"

Installing Docker on CentOS 7

Install Docker via Yum

yum install docker docker-registry

Start and enable Docker service

systemctl start docker.service
systemctl enable docker.service

Disable firewall (conflicts with Docker)

systemctl stop firewalld.service
systemctl disable firewalld.service

Download images from Docker.io

docker pull ubuntu