Thanks Vish & Mike. It works very well after flush the anti-spoofing rules , I change the IP address and bind alias IP to an interface, but when I restart nova-network and nova-compute , I can't ping neither the IP I changed nor the instances I haven't changed. I'll try to figure out what happened with that !!
Even I change the IP address, I can't not see the correct address on Dashboard, because the record of nova.fixed_ips not changed. I should try with FlatManager to allocate static IP. Thanks, -Jimmy 2012/4/27 Mike Scherbakov <mih...@gmail.com> > > > On Thu, Apr 26, 2012 at 10:31 PM, Vishvananda Ishaya < > vishvana...@gmail.com> wrote: > >> >> On Apr 25, 2012, at 7:31 PM, Jimmy Tsai wrote: >> >> > >> > Hi everyone, >> > >> > I'm running with Essex 2012.1, >> > and have some questions about the nova network operation, >> > >> > 1. Is it possible manually assigned IP address to a launched instance, >> my situation is : >> > after instance boot up (OS: CentOS 6.2), I changed the >> /etc/sysconfig/network-scripts/ifcfg-eth0 setting >> > from dhcp to static (the same subnet as created by command : >> nova-manage create network....), and restart the network service, >> > And then I couldn't ssh or ping the instance from other server with the >> same subnet. >> > What is the problem ? I checked the iptables policies on the compute >> host, and find nothing about the DROP packets. >> > I also tried to changed the record from nova.fixed_ips table and >> libvirt.xml of the instance, then reboot the instance, still not worked. >> > I used FlatDHCP as my network manager. >> >> You can't do this. Libvirt sets up no mac spoofing and no ip spoofing so >> the ip address needs to match the dhcp'd one. You should be able to switch >> to a static and use the same info that you get from dhcp though. >> > >> > 2. According to the first question, I have another requirement to set >> up a loopback IP address (lo:0) on the running instance, after setting was >> completed,I couldn't ping or ssh the loopback IP from the same subnet, and >> I tried to set a alias IP address with eth0:0, but still not get worked. >> > Any ideas with this ? >> > >> Not sure >> > I guess it's the same issue as with setting a different IP from what > dnsmasq provided. You can try ebtables -F; ebtables -t nat -F to flush > those anti spoofing rules. > >> > >> > 3. Is there any way to use 2 NICs with different subnets on instances? >> I want to separate the network traffic. >> > Now I'm running with one bridged interface (br100), and it works well. >> In order to backup the large log files, >> > I'm planing to use 2 NICs for the compute hosts, I want use 2 vNICs on >> instance, one for web service and the other for log backup, >> > I think I should create a new network for the second bridged interface, >> but I can't find any document to guild me. >> >> This is definitely possible with FlatManager (You could use cloud_config >> drive and some version of contrib/openstack-config converted to work with >> centos to set up the interfaces) >> >> It was possible at one point with FlatDHCPManager as well by creating >> multiple networks and using a specific combination of config options like >> use_single_default_gateway. I don' t know if anyone has tried this for a >> while so there may be issues with it. You might try creating a second >> network and setting use_single_default_gateway and see what happens. >> > Confirm that it works with Essex release. > If you don't specify use_single_default_gateway=true your default route > will be jumping from one interface to another. If you both subnets are > covered by --fixed_network, it's fine even without setting > the use_single_default_gateway. > > >> There are plans underway to support this by only dhcping the first >> interface and allowing a guest agent to set up the other interfaces, but it >> isn't in place yet. >> >> Vish >> _______________________________________________ >> Mailing list: https://launchpad.net/~openstack >> Post to : openstack@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~openstack >> More help : https://help.launchpad.net/ListHelp >> > > > > -- > Mike Scherbakov >
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