I have a server running Centos 5.2 as a Xen host. A problem that's shown up recently is that at boot, the dom0 interface eth0 doesn't come up properly, with the result that the host is only accessible via remote console. If I execute 'service network restart', eth0 comes up normally, with an IP address and the correct routing.
Three guests have been created via virt-manager and I haven't changed any of the defaults, so I'm not sure what's causing this.
Here's ifconfig output after boot:
lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:20 errors:0 dropped:0 overruns:0 frame:0 TX packets:20 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1308 (1.2 KiB) TX bytes:1308 (1.2 KiB)
peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:31844 errors:0 dropped:0 overruns:0 frame:0 TX packets:15 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4639017 (4.4 MiB) TX bytes:4898 (4.7 KiB) Interrupt:16 Memory:da000000-da012100
vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:24 errors:0 dropped:0 overruns:0 frame:0 TX packets:31489 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6891 (6.7 KiB) TX bytes:4490222 (4.2 MiB)
virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:84 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:16250 (15.8 KiB)
xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:31060 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4035093 (3.8 MiB) TX bytes:0 (0.0 b)
and again once I've restarted networking and have a guest running:
eth0 Link encap:Ethernet HWaddr 00:1E:C9:CD:C7:0A inet addr:10.99.91.151 Bcast:10.99.255.255 Mask:255.255.0.0 inet6 addr: fe80::21e:c9ff:fecd:c70a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15836 errors:0 dropped:0 overruns:0 frame:0 TX packets:10303 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2136620 (2.0 MiB) TX bytes:33113077 (31.5 MiB)
lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:6676 errors:0 dropped:0 overruns:0 frame:0 TX packets:6676 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:33006844 (31.4 MiB) TX bytes:33006844 (31.4 MiB)
peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:63781 errors:0 dropped:0 overruns:0 frame:0 TX packets:27001 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:9142626 (8.7 MiB) TX bytes:34301305 (32.7 MiB) Interrupt:16 Memory:da000000-da012100
tap0 Link encap:Ethernet HWaddr F2:C4:14:A0:43:50 inet6 addr: fe80::f0c4:14ff:fea0:4350/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:26853 errors:0 dropped:0 overruns:442 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:25995823 (24.7 MiB)
tap1 Link encap:Ethernet HWaddr 96:9D:94:41:A1:C9 inet6 addr: fe80::949d:94ff:fe41:a1c9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:26851 errors:0 dropped:0 overruns:443 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:25995669 (24.7 MiB)
vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:10327 errors:0 dropped:0 overruns:0 frame:0 TX packets:63318 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:33119968 (31.5 MiB) TX bytes:8871385 (8.4 MiB)
vif1.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF UP BROADCAST NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
vif1.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:16 errors:0 dropped:0 overruns:0 frame:0 TX packets:8820 errors:0 dropped:1 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:1584 (1.5 KiB) TX bytes:24001390 (22.8 MiB)
virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:35 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:10384 (10.1 KiB)
xenbr0 Link encap:Ethernet HWaddr 96:9D:94:41:A1:C9 UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:53695 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6909244 (6.5 MiB) TX bytes:0 (0.0 b)
Adam Huffman wrote on Mon, 15 Dec 2008 14:21:36 +0000:
If I execute 'service network restart', eth0 comes up normally, with an IP address and the correct routing.
The network-scripts in the default CentOS Xen are buggy. For instance, I found that when you have two IPs with different subnets configured for Dom0 the DomUs won't be able to get an IP from your normal DHCP server. (Compare discussion on this list quite some time back.) I didn't see a problem with the network of the Dom0, though. Check dmesg and other logs for any bootup errors. Make sure that your network setup on the machine is 100% correct and all subnets have a dedicated gateway. Something that isn't 100% correct, but normally works, may not work with these network scripts. I went to Xen 3.2 which has a completely revamped network/bridging structure.
Kai
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Adam Huffman -
Kai Schaetzl