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KVM Bridge doesn't get interface at boot, Any Idea ?

MetroVPS_NMPMetroVPS_NMP Host Rep, Veteran
in Help

Hello,

I installed KVM on My Home PC. But, the bridge is making weird issues.

Bridge isn't getting interface at the boot.

[root@node1 ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.18c04d08cd06       no

So, I checked the Network.service log.

Apr 15 13:23:09 node1 systemd[1]: Starting LSB: Bring up/down networking...
Apr 15 13:23:09 node1 network[853]: Bringing up loopback interface:  [  OK  ]
Apr 15 13:23:09 node1 network[853]: Bringing up interface eno1:  ERROR     : [/etc/sysconfig/network-scripts/ifup-eth] Device eno1 does not seem to be present, delaying initialization.
Apr 15 13:23:09 node1 network[853]: [FAILED]
Apr 15 13:23:13 node1 network[853]: Bringing up interface br0:  [  OK  ]
Apr 15 13:23:13 node1 systemd[1]: network.service: control process exited, code=exit
Apr 15 13:23:13 node1 systemd[1]: Failed to start LSB: Bring up/down networking.
Apr 15 13:23:13 node1 systemd[1]: Unit network.service entered failed state.
Apr 15 13:23:13 node1 systemd[1]: network.service failed.

Without any configuration change, when I issue command "systemctl start network.service", bridge gets interface & everything comes back.

Apr 15 13:26:15 node1 systemd[1]: Starting LSB: Bring up/down networking...
Apr 15 13:26:15 node1 network[1971]: Bringing up loopback interface:  [  OK  ]
Apr 15 13:26:15 node1 network[1971]: Bringing up interface eno1:  [  OK  ]
Apr 15 13:26:15 node1 network[1971]: Bringing up interface br0:  RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: [  OK  ]
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 network[1971]: RTNETLINK answers: File exists
Apr 15 13:26:15 node1 systemd[1]: Started LSB: Bring up/down networking.

&

[root@node1 ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.18c04d08cd06       no              eno1

Any Workaround, why is this happening ??

Comments

  • LeviLevi Veteran

    Boot priority? Init bridge AFTER eno1 is up.

  • MetroVPS_NMPMetroVPS_NMP Host Rep, Veteran

    @LTniger said:
    Boot priority? Init bridge AFTER eno1 is up.

    I understand the same but is there any guide how to do it ?? I can't find any tutorial to init bridge after eno1.

  • LeviLevi Veteran

    Here is tutorial: https://wiki.debian.org/BridgeNetworkConnections#Configuring_bridging_in_.2Fetc.2Fnetwork.2Finterfaces

    Section "add the static IP options under the br0 interface setup". In case tutorial is not clear, paste your current network cfg here.

  • MetroVPS_NMPMetroVPS_NMP Host Rep, Veteran

    @LTniger said:
    Here is tutorial: https://wiki.debian.org/BridgeNetworkConnections#Configuring_bridging_in_.2Fetc.2Fnetwork.2Finterfaces

    Section "add the static IP options under the br0 interface setup". In case tutorial is not clear, paste your current network cfg here.

    I have 3 files.

    [root@node1 network-scripts]# cat ifcfg-lo
DEVICE=lo
IPADDR=127.0.0.1
NETMASK=255.0.0.0
NETWORK=127.0.0.0
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback

    Then,

    [root@node1 network-scripts]# cat ifcfg-eno1
NAME=eno1
DEVICE=eno1
ONBOOT=yes
NM_CONTROLLED=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
BRIDGE=br0

    Lastly,

    [root@node1 network-scripts]# cat ifcfg-br0
DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
ONBOOT=yes
NM_CONTROLLED=no
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
IPADDR=192.168.0.200
NETMASK=255.255.0.0
GATEWAY=192.168.0.1
  • LeviLevi Veteran

    Set br0 "ONBOOT=yes" and eno1 "ONBOOT=no". Is this CentOS? I hate that OS for no apparent reason.

  • MetroVPS_NMPMetroVPS_NMP Host Rep, Veteran

    @LTniger said:
    Set br0 "ONBOOT=yes" and eno1 "ONBOOT=no". Is this CentOS? I hate that OS for no apparent reason.

    Yes, CentOS.

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