Microk8s : cannot ping outside pods - docker

Question

I'm using microk8s installed on my ubuntu server. and I try to ping outside from my pod
I have docker installed on my machine: when I run a container with docker I can ping outside :
~$ sudo ip addr show docker0
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:a7:9f:15:48 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
inet6 fe80::42:a7ff:fe8f:1548/64 scope link
valid_lft forever preferred_lft forever
on the container :
~$ sudo docker run --rm -it ubuntu:trusty bash
root#dd0af86b1209:/# ip addr show eth0
158: eth0#if159: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
valid_lft forever preferred_lft forever
root#dd0af86b1209:/# ip addr show
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
158: eth0#if159: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
valid_lft forever preferred_lft forever
root#dd0af86b1209:/# ping google.com
PING google.com (142.250.179.110) 56(84) bytes of data.
64 bytes from par21s20-in-f14.1e100.net (142.250.179.110): icmp_seq=1 ttl=108 time=3.71 ms
64 bytes from par21s20-in-f14.1e100.net (142.250.179.110): icmp_seq=2 ttl=108 time=3.70 ms
64 bytes from par21s20-in-f14.1e100.net (142.250.179.110): icmp_seq=3 ttl=108 time=3.74 ms
64 bytes from par21s20-in-f14.1e100.net (142.250.179.110): icmp_seq=4 ttl=108 time=3.75 ms
64 bytes from par21s20-in-f14.1e100.net (142.250.179.110): icmp_seq=5 ttl=108 time=3.76 ms
but on my pod with microk8s I can't ping outside :
/ # ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 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
3: eth0#if146: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1440 qdisc noqueue state UP
link/ether ba:03:bd:4b:66:97 brd ff:ff:ff:ff:ff:ff
inet 172.17.159.19/32 brd 172.17.159.19 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::b803:bdff:fe44:6697/64 scope link
valid_lft forever preferred_lft forever
/ # ping google.com
ping: bad address 'google.com'
ufw status :
Anywhere (v6) on cali+ ALLOW Anywhere (v6)
Anywhere (v6) on cni0 ALLOW Anywhere (v6)
Anywhere (v6) on cbr0 ALLOW Anywhere (v6)
Anywhere (v6) on eth0 ALLOW Anywhere (v6)
EDIT :
I tried to ping IP addresses and it worked, the problem is with hostnames resolution
this is my coredns configmap :
apiVersion: v1
data:
Corefile: ".:53 {\n errors\n health {\n lameduck 5s\n }\n ready\n
\ log . {\n class error\n }\n kubernetes cluster.local in-addr.arpa
ip6.arpa {\n pods insecure\n fallthrough in-addr.arpa ip6.arpa\n }\n
\ prometheus :9153\n forward . 8.8.8.8 8.8.4.4 \n cache 30\n loop\n
\ reload\n loadbalance\n}\n"
kind: ConfigMap
metadata:
annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"v1","data":{"Corefile":".:53 {\n errors\n health {\n lameduck 5s\n }\n ready\n log . {\n class error\n }\n kubernetes cluster.local in-addr.arpa ip6.arpa {\n pods insecure\n fallthrough in-addr.arpa ip6.arpa\n }\n prometheus :9153\n forward . 8.8.8.8 8.8.4.4 \n cache 30\n loop\n reload\n loadbalance\n}\n"},"kind":"ConfigMap","metadata":{"annotations":{},"labels":{"addonmanager.kubernetes.io/mode":"EnsureExists","k8s-app":"kube-dns"},"name":"coredns","namespace":"kube-system"}}
creationTimestamp: "2022-06-19T17:07:02Z"
labels:
addonmanager.kubernetes.io/mode: EnsureExists
k8s-app: kube-dns
name: coredns
namespace: kube-system
resourceVersion: "7503127"
selfLink: /api/v1/namespaces/kube-system/configmaps/coredns
uid: 0735a387-6970-43ab-8490-cdf49a23f936
Thanks in advance for your answers