CODEWITHSUNDEEP
linuxkubernetesnetwork-programmingmicrok8s
Ertan Hasani
Ertan Hasani

Reputation: 1773

How to access hosts in my network from microk8s deployment pods

I am trying to access a host that sits in another server (but on my network) from inside the pod of deployment and I am using microk8s.

The thing is that on the server where I have microk8s installed I can easily ping it by ping my-network-host.qa.local. But when I go inside the pod with microk8s kubectl exec -it pod_name -- /bin/bash and I do ping my-network-host.qa.local it says: Name or service not known.

And when I connect to a VPN on my computer to be on that network and I deploy it locally using docker-desktop kubernetes I can ping that host from within the pod. So I think the problem sits in microk8s which is not letting my pod use my network.

Is there any way to tell microk8s to use my hosts from my network?

p.s. I can ping the ip of that server from the pod, but I am not being able to ping the host from the pod

Upvotes: 4

Views: 4810

Answers (1)

Ertan Hasani
Ertan Hasani

Reputation: 1773

Based on another answer that I found on StackOverflow, i managed to fixed it.

There were 2 changes needed to make it work:

Update kubelet configuration to use resolv-conf:

sudo echo "--resolv-conf=/run/systemd/resolve/resolv.conf" >> /var/snap/microk8s/current/args/kubelet

Restart kubelet service:

sudo service snap.microk8s.daemon-kubelet restart

Then change the CoreDNS forward to point to your nameserver:

First open coredns config map so you can edit it

sudo microk8s.kubectl edit configmap coredns -n kube-system

and update the file at

forward . 8.8.8.8 8.8.4.4 #REMOVE THIS LINE
forward . xxx.xxx.xxx.xxx #ADD THIS WITH YOUR IP

You can get eth0 DNS address:

nmcli dev show 2>/dev/null | grep DNS | sed 's/^.*:\s*//'

On my case I already had the ip as nameserver on /run/systemd/resolve/resolv.conf.

Now just save the changes, and go inside your pods so you will be able to access them.

There is a comment in another post that suggest adding

forward . /etc/resolv.conf

But that didnt work on my case.

Upvotes: 3

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