cmingt at gmail
Apr 26, 2012, 2:22 AM
Views: 698
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questions about IP addressing and network config
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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
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--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 [at] 172/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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questions about IP addressing and network config
