Centos 5.1, an updated kernel and xen were pushed out RH, i believe in
response to a rash of security bugs found. i updated my guest instances,
rebooted them, they were still reachable. updated domU and rebooted, and
now the guests are no longer reachable. figuring i fubarred the proper
steps i destroyed then created the instances again - still no go.
domU is running:
kernel-xen-2.6.18-53.1.21.el5
xen-3.0.3-41.el5_1.6
xen-libs-3.0.3-41.el5_1.6
and the guests are running:
kernel-xen-2.6.18-53.1.21.el5
right now i have only one guest up (why bother with the others running.
on domU, if have the following IFs:
eth0 Link encap:Ethernet HWaddr 00:30:48:C0:6C:5A
inet addr:10.255.40.100 Bcast:10.255.40.255 Mask:255.255.255.0
inet6 addr: fe80::230:48ff:fec0:6c5a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:39458 errors:0 dropped:0 overruns:0 frame:0
TX packets:1113 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2433216 (2.3 MiB) TX bytes:133979 (130.8 KiB)
Interrupt:19 Base address:0xa000
eth0:1 Link encap:Ethernet HWaddr 00:30:48:C0:6C:5A
inet addr:10.255.40.101 Bcast:10.255.40.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:19 Base address:0xa000
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:130 errors:0 dropped:0 overruns:0 frame:0
TX packets:130 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:16056 (15.6 KiB) TX bytes:16056 (15.6 KiB)
vif6.0 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:451 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:18682 (18.2 KiB) TX bytes:0 (0.0 b)
xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:4125 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:121554 (118.7 KiB) TX bytes:0 (0.0 b)
and the routing table on domU is:
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
10.255.40.0 0.0.0.0 255.255.255.0 U 0 0 0
eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
0.0.0.0 10.255.40.1 0.0.0.0 UG 0 0 0
eth0
which is correct. brctl show returns the following:
bridge name bridge id STP enabled interfaces
xenbr0 8000.feffffffffff no vif6.0
on the guest i have:
eth0 Link encap:Ethernet HWaddr 00:16:3E:2C:CF:7E
inet addr:10.255.40.110 Bcast:10.255.40.255 Mask:255.255.255.0
inet6 addr: fe80::216:3eff:fe2c:cf7e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:479 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:26172 (25.5 KiB)
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:365 errors:0 dropped:0 overruns:0 frame:0
TX packets:365 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:32683 (31.9 KiB) TX bytes:32683 (31.9 KiB)
and the routing table is
Destination Gateway Genmask Flags MSS Window irtt
Iface
10.255.40.0 0.0.0.0 255.255.255.0 U 0 0 0
eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
0.0.0.0 10.255.40.1 0.0.0.0 UG 0 0 0
eth0
which again is exactly as expected. interestingly, after xm console'ing
to a guest instance, i can ping, traceroute, and even ssh to *another*
guest instance - but not to the domU or to any other network besides the
other guests.
i'm baffled. i'm unclear what exactly broke, or why/how it broke - and
most importantly, how to fix it. i've been googling for hours.
thoughts, suggestions, brickbats, ?
--
Paul Theodoropoulos
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