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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 change the DB record from nova.fixed_ips table and
libvirt.xml of the instance directory, then reboot the instance, I can see
the instance get new IP from DHCP, but still not worked(can't ping & ssh).

I used FlatDHCP  as my network manager.



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
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 ?



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.



List my nova.conf below

==========================================

--dhcpbridge_flagfile=/etc/nova/nova.conf

--dhcpbridge=/usr/bin/nova-dhcpbridge

--logdir=/var/log/nova

--state_path=/var/lib/nova

--lock_path=/var/lock/nova

--allow_admin_api=true

--use_deprecated_auth=false

--auth_strategy=keystone

--scheduler_driver=nova.scheduler.simple.SimpleScheduler

--s3_host=172.19.7.1

--ec2_host=172.19.7.1

--rabbit_host=172.19.7.1

--cc_host=172.19.7.1

--nova_url=http://172.19.7.1:8774/v1.1/

 #--routing_source_ip=172.19.7.1

--glance_api_servers=172.19.7.1:9292

 --image_service=nova.image.glance.GlanceImageService

#--iscsi_ip_prefix=192.168.22

--sql_connection=mysql://nova:nova@172.19.7.1/nova

 --ec2_url=http://172.19.7.1:8773/services/Cloud

--keystone_ec2_url=http://172.19.7.1:5000/v2.0/ec2tokens

 --api_paste_config=/etc/nova/api-paste.ini

--libvirt_type=kvm

--libvirt_use_virtio_for_bridges=true

--start_guests_on_host_boot=true

--resume_guests_state_on_host_boot=true

#--vnc_enabled=true

--novnc_enabled=true

#--vncproxy_url=http://172.19.7.1:6080/vnc_auto.html



 #--vnc_console_proxy_url=http://172.19.7.1:6080

 --novncproxy_base_url=http://172.19.7.1:6080/vnc_auto.html

 --xvpvncproxy_base_url=http://172.19.7.1:6081/console

 #--vncserver_listen=172.19.7.1

#--vncserver_proxyclient_address=172.19.7.1

--vncserver_listen=0.0.0.0

--vncserver_proxyclient_address=0.0.0.0



# network specific settings

--network_manager=nova.network.manager.FlatDHCPManager

#--network_manager=nova.network.quantum.manager.QuantumManager

#--quantum_connection_host=172.19.7.1

#--quantum_connection_port=9696

--public_interface=eth0

--flat_interface=eth0

--flat_network_bridge=br100

--fixed_range=172.19.7.0/24

 --network_size=254

--flat_network_dhcp_start=172.19.7.41

--multi_host

--flat_injected=False

--force_dhcp_release

--iscsi_helper=tgtadm

--connection_type=libvirt

--root_helper=sudo nova-rootwrap

#--verbose

#--verbose=true

--verbose=false

--libvirt_xml_template=/usr/share/pyshared/nova/virt/libvirt.xml.template

--allow_resize_to_same_host=true

--max_cores=30

=================================================


if I misunderstand something, please correct me, thanks.



-Jimmy
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