[FIXED] Networking does not come up upon boot

[nebukazar]

Hi,

Our of our CentOS7 VM (running on a HyperV 2012R2 node) is having some networking issues when rebooting.
Our "eth0" device isn't being brought up automatically; we need to log into the VM through console first and then do a network restart.

We're not using NetworkManager, but are using the old network service.

Here is our current eth0 configuration:

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# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
TYPE="Ethernet"
NM_CONTROLLED="no"
BOOTPROTO="none"
DEFROUTE="yes"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
HWADDR=00:15:5D:9E:AA:0B
IPADDR="HIDDEN..."
PREFIX="27"
GATEWAY="HIDDEN..."
DNS1="HIDDEN..."
DOMAIN="HIDDEN..."

Some error messages from /var/log/messages upon our last reboot shows that eth0 doesn't seem to be present upon the boot sequence; but seems to be there once we're loggued into the console:

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Jun 26 00:29:59 del-client-0009-02 network: Bringing up interface eth0:  ERROR    : [/etc/sysconfig/network-scripts/ifup-eth] Device eth0 does not seem to be present, delaying initialization.
Jun 26 00:30:00 del-client-0009-02 /etc/sysconfig/network-scripts/ifup-eth: Device eth0 does not seem to be present, delaying initialization.
Jun 26 00:30:01 del-client-0009-02 network: Bringing up interface eth0:  ERROR    : [/etc/sysconfig/network-scripts/ifup-eth] Device eth0 does not seem to be present, delaying initialization.
Jun 26 00:30:01 del-client-0009-02 /etc/sysconfig/network-scripts/ifup-eth: Device eth0 does not seem to be present, delaying initialization.
Jun 26 00:30:10 del-client-0009-02 cpipv6: STDERR: Device "eth0" does not exist.y 
Jun 26 00:30:46 del-client-0009-02 network: Bringing up interface eth0:  [  OK  ]

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# ip -s l
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    RX: bytes  packets  errors  dropped overrun mcast   
    100742     946      0       0       0       0       
    TX: bytes  packets  errors  dropped carrier collsns 
    100742     946      0       0       0       0       
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT qlen 1000
    link/ether 00:15:5d:9e:aa:0b brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast   
    746422     9161     0       273     0       0       
    TX: bytes  packets  errors  dropped carrier collsns 
    6521087    3398     0       0       0       0      

This seems to have started just a few days ago.

Any ideas what might be causing the issue ?

Thanks,

[jlehtone]

What will you have, if you have no ifcfg-eth0?

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lspci | grep -i net
ip li

Which driver handles the HyperV's interface?

[nebukazar]

What will you have, if you have no ifcfg-eth0?

Code: Select all

lspci | grep -i net
ip li

Which driver handles the HyperV's interface?

I just found out what happened!
We had a kernel update and somehow, the LIS drivers got missed up.
We had to re-install the LIS drivers which fixed everything!

Thanks for the help though.

-Luc