I'm running KVM on a centOS 7 server and it has been working fine, but occasionally the network connections to the virtual machines seams to drop and the virtual machines can't be reached until the main server is rebooted. I have 2 network connections running into the server. 1 is the primary ethernet on the motherboard while the other is a secondary card ethernet connection. I configured the 2nd connection to be used for a bridge network using these instruction
http://www.server-world.info/en/note...OS_7&p=kvm&f=1
Any ideas or suggestions would be appreciated.
Update:
Network interfaces
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
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT qlen 1000
link/ether d4:ae:52:d3:46:5a brd ff:ff:ff:ff:ff:ff
3: p4p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP mode DEFAULT qlen 1000
link/ether 68:05:ca:1b:39:0a brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT
link/ether 68:05:ca:1b:39:0a brd ff:ff:ff:ff:ff:ff
5: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT
link/ether 52:54:00:73:66:ae brd ff:ff:ff:ff:ff:ff
6: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN mode DEFAULT qlen 500
link/ether 52:54:00:73:66:ae brd ff:ff:ff:ff:ff:ff
7: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN mode DEFAULT qlen 500
link/ether fe:54:00:8c:52:72 brd ff:ff:ff:ff:ff:ff
8: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN mode DEFAULT qlen 500
link/ether fe:54:00:09:d3:6b brd ff:ff:ff:ff:ff:ff
9: vnet2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN mode DEFAULT qlen 500
link/ether fe:54:00:48:f6:01 brd ff:ff:ff:ff:ff:ff
10: vnet3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN mode DEFAULT qlen 500
link/ether fe:54:00:4f:32:b9 brd ff:ff:ff:ff:ff:ff
17: vnet4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN mode DEFAULT qlen 500
link/ether fe:54:00:a8:8e:bf brd ff:ff:ff:ff:ff:ff
This is what /etc/sysconfig/network-scripts/ifcfg-br0 looks like
DEVICE=br0
TYPE=Bridge
BOOTPROTO=dhcp
ONBOOT=yes
/em1 looks like
HWADDR="D4:AE:52
3:46:5A"
TYPE="Ethernet"
BOOTPROTO="dhcp"
DEFROUTE="yes"
PEERDNS="yes"
PEERROUTES="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_PEERDNS="yes"
IPV6_PEERROUTES="yes"
IPV6_FAILURE_FATAL="no"
NAME="em1"
UUID="75be4f11-11ad-4ce2-a0d3-1601dfd2a7a6"
ONBOOT="yes"
secondary ethernet card p4p1
HWADDR=68:05:CA:1B:39:0A
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=p4p1
UUID=2c82ff3a-04c5-4531-940b-48533a2edbf5
ONBOOT=yes
BRIDGE=br0
