• device eth0 does not seem to be present, delaying initialization” Error

    Recently ,I have taken a template from Centos 6 on Cloudstack and when trying to bring up a new VM from the template and trying to start the network service received the error: “device eth0 does not seem to be present, delaying initialization”
    When investigating the problem ,It turns out that the NIC on the machine was being renamed and registered to eth1.

    # ls /sys/class/net
eth1 lo

    udev is is the device manager,which stores the settings of the NIC  ,So we have to do three things :

    1.  edit the udev config file /etc/udev/rules.d/70-persistent-net.rules
      It will be look like :

      # PCI device 0x1af4:0x1000 (virtio-pci)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="02:00:00:72:00:04", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="02:00:00:72:00:05", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

      We need to Delete the first SUBSYSTEM entry in the file and modify the second SUBSYSTEM entry  (Update the ‘eth1’ attribute to ‘eth0’)

      SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="02:00:00:72:00:05", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
    2. Edit /etc/sysconfig/network-scripts/ifcfg-eth0Change the HWADDR to match the new mac address listed in the newly edited 70-persistent-net.rules file 
      DEVICE=eth0
HWADDR=02:00:00:72:00:05
TYPE=Ethernet
UUID=dd7b09f3-56ab-40a6-a740-e4c1bae2c5b3
ONBOOT=yes
NM_CONTROLLED=yes
IPADDR=10.1.1.89
NETMASK=255.255.255.0
GATEWAY=10.1.1.1
BOOTPROTO=none
DNS2=10.1.80.13
DNS1=10.1.80.12
IPV6INIT=no
USERCTL=no
    3. Reload udev configuration & restart network service 
      # start_udev
# /etc/init.d/network restart

    eth0 should be up now 🙂

    Categories: Linux, Virtualization

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