Kolla Ansilble: Openstack Instances Unable to access Internet or eachother - ansible

Question

I am a newbie to openstack (deployed using kolla-ansible) and have created two instances both are ubuntu 20.04 VMs. I am able to ping and ssh them from the host machine (192.168.211.133) and vice versa. However instances are unable to access internet. The virtual router is also unable to access internet:
Configuration of one of the machine is below;
root#kypo-virtual-machine:/etc/apt/sources.list.d# ip netns ls
qrouter-caca1d42-86b4-42a2-b591-ec7a90437029 (id: 1)
qdhcp-0ec41857-9420-4322-9fef-e332c034e98e (id: 0)
root#kypo-virtual-machine:/etc/apt/sources.list.d# ip netns e qrouter-caca1d42-86b4-42a2-b591-ec7a90437029 route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.211.1 0.0.0.0 UG 0 0 0 qg-f31a26b7-25
192.168.64.0 0.0.0.0 255.255.192.0 U 0 0 0 qr-e5c8842c-c2
192.168.211.0 0.0.0.0 255.255.255.0 U 0 0 0 qg-f31a26b7-25
Netplan of instance shows:
# This file is generated from information provided by the datasource. Changes
# to it will not persist across an instance reboot. To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
version: 2
ethernets:
ens3:
dhcp4: true
match:
macaddress: fa:16:3e:a7:9d:70
mtu: 1450
set-name: ens3
And IP sheme is:
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc
fq_codel state UP group default qlen 1000
link/ether fa:16:3e:a7:9d:70 brd ff:ff:ff:ff:ff:ff
inet 192.168.65.39/18 brd 192.168.127.255 scope global dynamic ens3
valid_lft 85719sec preferred_lft 85719sec
inet6 fe80::f816:3eff:fea7:9d70/64 scope link
valid_lft forever preferred_lft forever
From Horizon
IP Addresses
kypo-base-net
192.168.65.39, 192.168.211.250
Security Groups
kypo-base-proxy-sg
ALLOW IPv6 to ::/0
ALLOW IPv4 icmp from 0.0.0.0/0
ALLOW IPv4 22/tcp from 0.0.0.0/0
ALLOW IPv4 udp from b9904736-6d8a
ALLOW IPv4 tcp from b9904736-6d8a
ALLOW IPv4 tcp from 73ca626b-7cfb
ALLOW IPv4 udp from 73ca626b-7cfb
ALLOW IPv4 to 0.0.0.0/0

Answer 1

I was able to resolve the issue by pinpointing that the gateway used by the virtual router (192.168.211.1) was different form the one used by my host VM (192.168.211.2).
kypo#kypo-virtual-machine:/etc/kolla$ ip route show
default via 192.168.211.2 dev ens33 proto dhcp
src 192.168.211.133 metric 100
I modify the gateway;
openstack subnet set --gateway 192.168.211.2 public-subnet
And now my instances are able to access internet.
The main reason for this configuration issue was while creating the subnet I used auto for --gateway option and obviously it didn't pick the correct gateway.