[NETVIRT-1224] host route not getting pushed to VM after updating subnet with host routes

Wed, 26 Sep 2018 10:01:32 +0000

Configured Subnets:
-------------------

(neutron) subnet-list
--------------------------------------------------------------------------------------------------------+

name

cidr

allocation_pools

--------------------------------------------------------------------------------------------------------+

7d3d86df-5974-463b-8a75-6080d9d4d374	SUBNET1	10.10.10.0/24	{"start": "10.10.10.2", "end": "10.10.10.254"}
e8049198-da7c-4b41-af30-bfe31363e36c	SUBNET2	10.20.20.0/24	{"start": "10.20.20.2", "end": "10.20.20.254"}
18e237ca-d0a3-4faf-9d9e-2b8caeb58f3a	SUBNET4	10.40.40.0/24	{"start": "10.40.40.2", "end": "10.40.40.254"}
92bd28f8-5476-4d92-997f-2d5da5e2b70d	SUBNET3	10.30.30.0/24	{"start": "10.30.30.2", "end": "10.30.30.254"}

--------------------------------------------------------------------------------------------------------+

(neutron) subnet-show SUBNET2
----------------------------------------------------------------------------+

Field

Value

----------------------------------------------------------------------------+

allocation_pools	{"start": "10.20.20.2", "end": "10.20.20.254"}
cidr	10.20.20.0/24
created_at	2017-12-12T04:22:05
description
dns_nameservers
enable_dhcp	True
gateway_ip	10.20.20.1
host_routes	{"destination": "10.10.10.0/24", "nexthop": "10.20.20.5"}
id	e8049198-da7c-4b41-af30-bfe31363e36c
ip_version	4
ipv6_address_mode
ipv6_ra_mode
name	SUBNET2
network_id	817fc530-411a-406e-91de-4f06b9013b5f
subnetpool_id
tenant_id	6f5d2d2c15a241b7be98359b6b5130fc
updated_at	2017-12-12T04:36:09

----------------------------------------------------------------------------+

Checking the routes in VM for SUBNET2
VM2:

root@vm2:~# ifconfig
eth0 Link encap:Ethernet HWaddr fa:16:3e:f0:a0:e0
inet addr:10.20.20.3 Bcast:10.20.20.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fef0:a0e0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:1 overruns:0 frame:0
TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2558 (2.5 KB) TX bytes:4574 (4.5 KB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:116 errors:0 dropped:0 overruns:0 frame:0
TX packets:116 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:10272 (10.2 KB) TX bytes:10272 (10.2 KB)

root@vm2:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.20.20.1 0.0.0.0 UG 0 0 0 eth0
10.20.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

root@vm2:~# dhclient eth0
RTNETLINK answers: File exists
root@vm2:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.20.20.1 0.0.0.0 UG 0 0 0 eth0
10.20.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
root@vm2:~#

Routes are not pushed to VMs after DHCP request from VM

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

Checking the routes in cirros image

root@compute-0-1:~# nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=33631c28-11ae-4e46-82ed-b269367cfa04 VM2 --security-groups sg-hostroute --availability-zone nova:compute-0-1.domain.tld
----------------------------------------------------------------------------------------------------+

Property

Value

----------------------------------------------------------------------------------------------------+

OS-DCF:diskConfig	MANUAL
OS-EXT-AZ:availability_zone	nova
OS-EXT-SRV-ATTR:host
OS-EXT-SRV-ATTR:hostname	vm2
OS-EXT-SRV-ATTR:hypervisor_hostname
OS-EXT-SRV-ATTR:instance_name	instance-00000710
OS-EXT-SRV-ATTR:kernel_id
OS-EXT-SRV-ATTR:launch_index	0
OS-EXT-SRV-ATTR:ramdisk_id
OS-EXT-SRV-ATTR:reservation_id	r-tbk1844e
OS-EXT-SRV-ATTR:root_device_name
OS-EXT-SRV-ATTR:user_data
OS-EXT-STS:power_state	0
OS-EXT-STS:task_state	scheduling
OS-EXT-STS:vm_state	building
OS-SRV-USG:launched_at
OS-SRV-USG:terminated_at
accessIPv4
accessIPv6
adminPass	26RaDGMGxLme
config_drive
created	2017-12-12T05:40:41Z
description
flavor	myhuge (1)
hostId
host_status
id	a3cd2987-2365-4f51-811a-d518a0fa3cc5
image	cirros-0.3.4-x86_64-uec (6e6ee817-0256-408a-b09d-fba4d1aaa234)
key_name
locked	False
metadata	{}
name	VM2
os-extended-volumes:volumes_attached	[]
progress	0
scheduler_hints	{}
security_groups	sg-hostroute
status	BUILD
tenant_id	6f5d2d2c15a241b7be98359b6b5130fc
updated	2017-12-12T05:40:41Z
user_id	5c3e508cfbf04adeba44629f49e2bcba

----------------------------------------------------------------------------------------------------+
root@compute-0-1:~#
root@compute-0-1:~#
root@compute-0-1:~#
root@compute-0-1:~#
root@compute-0-1:~# clear
root@compute-0-1:~# sudo virsh list
Id Name State
----------------------------------------------------
1 cic-1_vm running
46 instance-000006f5 running
47 instance-000006f8 running
49 instance-00000707 running
50 instance-0000070d running
51 instance-00000710 running

root@compute-0-1:~# sudo virsh console 51
Connected to domain instance-00000710
Escape character is ^]

login as 'cirros' user. default password: 'cubswin'. use 'sudo' for root.
vm2 login: cirros
Password:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether fa:16:3e:f0:a0:e0 brd ff:ff:ff:ff:ff:ff
inet 10.20.20.3/24 brd 10.20.20.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fef0:a0e0/64 scope link
valid_lft forever preferred_lft forever

$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.20.20.1 0.0.0.0 UG 0 0 0 eth0
10.20.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

$ sudo /sbin/cirros-dhcpc up eth0
udhcpc (v1.23.2) started
Sending discover...
Sending select for 10.20.20.3...
Lease of 10.20.20.3 obtained, lease time 86400
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.20.20.1 0.0.0.0 UG 0 0 0 eth0
10.20.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

$ sudo ifconfig eth0 down
$ ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 18 bytes 1692 (1.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 18 bytes 1692 (1.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

$ sudo /sbin/cirros-dhcpc up eth0
udhcpc (v1.23.2) started
Sending discover...
Sending select for 10.20.20.3...
Lease of 10.20.20.3 obtained, lease time 86400
$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.20.20.3 netmask 255.255.255.0 broadcast 10.20.20.255
inet6 fe80::f816:3eff:fef0:a0e0 prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:f0:a0:e0 txqueuelen 1000 (Ethernet)
RX packets 8 bytes 2284 (2.2 KiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 28 bytes 3496 (3.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 18 bytes 1692 (1.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 18 bytes 1692 (1.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.20.20.1 0.0.0.0 UG 0 0 0 eth0
10.20.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

rechecking the hostroutes configured in SUBNET2

root@compute-0-1:~# neutron
(neutron) subnet-show SUBNET2
----------------------------------------------------------------------------+

Field

Value

----------------------------------------------------------------------------+

allocation_pools	{"start": "10.20.20.2", "end": "10.20.20.254"}
cidr	10.20.20.0/24
created_at	2017-12-12T04:22:05
description
dns_nameservers
enable_dhcp	True
gateway_ip	10.20.20.1
host_routes	{"destination": "10.10.10.0/24", "nexthop": "10.20.20.5"}
id	e8049198-da7c-4b41-af30-bfe31363e36c
ip_version	4
ipv6_address_mode
ipv6_ra_mode
name	SUBNET2
network_id	817fc530-411a-406e-91de-4f06b9013b5f
subnetpool_id
tenant_id	6f5d2d2c15a241b7be98359b6b5130fc
updated_at	2017-12-12T04:36:09

----------------------------------------------------------------------------+

OpenDaylight JIRA

[NETVIRT-1224] host route not getting pushed to VM after updating subnet with host routes