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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