OpenStack Compute (nova)

Network configuration in compute node

Asked by TG SASIKUMAR

HI All,

I am facing Network routing issue. I am unable to login to the instance which created in the compute node.

In cloud controller br100 ip is 192.168.20.33 ( we assigned IP range for VM is 192.168.20.X and 192.168.20.33 is assigned for this br100. )

In compute node : its taking the eth1 ip for br100 (due to this i am unable to connect the instance )

Below is my controller & node network settings. Please give you suggestion for fixing this issue.

Network Settings below :

Cloudserver :

root@cloudserver:~# ifconfig
br100 Link encap:Ethernet HWaddr 00:1a:64:c5:8d:fa
          inet addr:192.168.20.33 Bcast:192.168.20.63 Mask:255.255.255.224
          inet6 addr: fe80::a08b:5eff:fe9a:b679/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:474 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1585 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:58255 (58.2 KB) TX bytes:160050 (160.0 KB)

eth0 Link encap:Ethernet HWaddr 00:1a:64:c5:8d:f8
          inet addr:192.168.10.6 Bcast:192.168.10.31 Mask:255.255.255.224
          inet6 addr: fe80::21a:64ff:fec5:8df8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:876113 errors:0 dropped:0 overruns:0 frame:0
          TX packets:513749 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:263861137 (263.8 MB) TX bytes:282799476 (282.7 MB)
          Interrupt:16 Memory:ce000000-ce012800

eth1 Link encap:Ethernet HWaddr 00:1a:64:c5:8d:fa
          inet6 addr: fe80::21a:64ff:fec5:8dfa/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:1248 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2514 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:112890 (112.8 KB) TX bytes:195372 (195.3 KB)
          Interrupt:17 Memory:ca000000-ca012800

virbr0 Link encap:Ethernet HWaddr 42:da:6b:2f:23:48
          inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 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:0 (0.0 B) TX bytes:0 (0.0 B

vnet0 Link encap:Ethernet HWaddr fe:16:3e:0f:c6:e3
          inet6 addr: fe80::fc16:3eff:fe0f:c6e3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:40 errors:0 dropped:0 overruns:0 frame:0
          TX packets:87 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:5868 (5.8 KB) TX bytes:12121 (12.1 KB)

Compute Node :

br100 Link encap:Ethernet HWaddr 9c:8e:99:fb:6f:4c
          inet addr:192.168.4.2 Bcast:192.168.4.63 Mask:255.255.255.192
          inet6 addr: fe80::3c5a:28ff:fea1:a785/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:37 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5759 (5.7 KB) TX bytes:1169 (1.1 KB)

eth0 Link encap:Ethernet HWaddr 9c:8e:99:fb:6f:4a
          inet addr:192.168.10.2 Bcast:192.168.10.31 Mask:255.255.255.224
          inet6 addr: fe80::9e8e:99ff:fefb:6f4a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:2826208 errors:0 dropped:0 overruns:0 frame:0
          TX packets:234384 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4279085698 (4.2 GB) TX bytes:16879676 (16.8 MB)
          Interrupt:16 Memory:f4000000-f4012800

eth1 Link encap:Ethernet HWaddr 9c:8e:99:fb:6f:4c
          inet6 addr: fe80::9e8e:99ff:fefb:6f4c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:42 errors:0 dropped:0 overruns:0 frame:0
          TX packets:97 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:5770 (5.7 KB) TX bytes:12817 (12.8 KB)
          Interrupt:17 Memory:f2000000-f2012800

virbr0 Link encap:Ethernet HWaddr ba:36:f7:98:dd:60
          inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 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:0 (0.0 B) TX bytes:0 (0.0 B)

vnet0 Link encap:Ethernet HWaddr fe:16:3e:56:cb:ab
          inet6 addr: fe80::fc16:3eff:fe56:cbab/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:32 errors:0 dropped:0 overruns:0 frame:0
          TX packets:47 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:4107 (4.1 KB) TX bytes:6278 (6.2 KB)

------------------
T.G.Sasikumar

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Revision history for this message
warrior (open4job) said : 		#1

what't your nova configuration?

Revision history for this message
ZhiQiang Fan (aji-zqfan) said : 		#2

br100 will get ip automatically and usually will bridge on a private nic (also can bridge on public nic, but instance will get a floating ip in the host's network).
so on compute node, if you do not assign an ip to the br100 manually, the problem will be that you have defined a wrong fixed_ip_range when create a private network
please check your instance's network since i notice vnet0 are created on the two nodes.

any detail will help us to locate the problem, especially the output of
shell>nova-manage network list
or content of /etc/nova/nova.conf

Revision history for this message
TG SASIKUMAR (tgsasi) said : 		#3

Hi ,

Thanks for looking this issue , Output of # nova-manage network list is below
id IPv4 IPv6 start address DNS1 DNS2 VlanID project uuid
2 192.168.20.32/27 None 192.168.20.34 8.8.4.4 None None None 65fa4c9a-312b-45e3-9712-48e6194deca1

/etc/nova/nova.conf details below

--allow_admin_api=true
--use_deprecated_auth=false
--scheduler_driver=nova.scheduler.simple.SimpleScheduler
--s3_host=192.168.10.6
--ec2_host=192.168.10.6

#### RabbitMQ #########
--rabbit_host=192.168.10.6

--nova_url=http://192.168.10.6:8774/v1.1/
--routing_source_ip=192.168.10.6
--iscsi_ip_prefix=192.168.21
--ec2_url=http://192.168.10.6:8773/services/Cloud
--keystone_ec2_url=http://192.168.10.6:5000/v2.0/ec2tokens
--api_paste_config=/etc/nova/api-paste.ini

############ Nova Compute ###########
--connection_type=libvirt
--libvirt_type=kvm
#-libvirt_type=qemu
--libvirt_use_virtio_for_bridges=true
--libvirt_cpu_mode=host-model
--use_cow_images=True
--snapshot_image_format=qcow2

######### Nova Volume #############
--start_guests_on_host_boot=true
--resume_guests_state_on_host_boot=true
--iscsi_helper=tgtadm
--ec2_private_dns_show_ip

####### Glance #########
--glance_api_servers=192.168.10.6:9292
--image_service=nova.image.glance.GlanceImageService

############ MYSQL ############
--sql_connection=mysql://novadbadmin:global@192.168.10.6/nova

######## nova API ##########
--auth_strategy = keystone
--cc_host=192.168.10.6

########## vnc specific configuration ########
#--novnc_enabled=true
#--novncproxy_base_url=http://192.168.10.6:6080/vnc_auto.html
#--vncserver_proxyclient_address=192.168.10.6
#--vncserver_listen=192.168.10.6

######### Nova Network ################
--network_manager=nova.network.manager.FlatDHCPManager
--public_interface=eth0
--flat_interface=eth1
--flat_network_bridge=br100
--fixed_range=192.168.20.0/27
--floating_range=192.168.4.0/26
--public_interface=vlan100
##--auto_assign_floating_ip=True
--network_size=32
--flat_network_dhcp_start=192.168.20.33
--flat_injected=false
--force_dhcp_release
--dhcpbridge_flagfile=/etc/nova/nova.conf
--dhcpbridge=/usr/bin/nova-dhcpbridge
--force_dhcp_release
######### MISC ##########
--logdir=/var/log/nova
--state_path=/var/lib/nova
--lock_path=/var/lock/nova
--root_helper=sudo nova-rootwrap
--verbose

------------
T.G.Sasikumar

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