Comments (8)
DwayneGit
commented on May 26, 2024
Just figured it out. You run the curl command from one of the nodes. If you did the same as me you ran it on master.
Edit:
It only worked from my first node. Still learning...
probably should be available from all nodes 🤷♂
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justinabrahms
commented on May 26, 2024
This is just a thoery, but I believe the issue here is that there's no external ip address associated with the service:
pi@raspberrypi2:~ $ kubectl get service markdownrender
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
markdownrender NodePort 10.106.161.23 <none> 8080:31118/TCP 17m
no external ip, only the cluster ip. You can access it only from the host it's scheduled on.
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DwayneGit
commented on May 26, 2024
It has to do with the iptables of the pis that are preventing them from
communicating. They have to be using leagcy binaries these three commands
solved my problem:
sudo iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
sudo iptables -A FORWARD -i wlan0 -o eth0 -m state --state
RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT
More on it here ->
https://www.shogan.co.uk/kubernetes/building-a-raspberry-pi-kubernetes-cluster-part-1-routing/
…On Wed, Mar 4, 2020, 12:40 AM Justin Abrahms ***@***.***> wrote:
This is just a thoery, but I believe the issue here is that there's no
external ip address associated with the service:
***@***.***:~ $ kubectl get service markdownrender
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
markdownrender NodePort 10.106.161.23 <none> 8080:31118/TCP 17m
no external ip, only the cluster ip. You can access it only from the host
it's scheduled on.
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justinabrahms
commented on May 26, 2024
That website seems to suggest that those ip table rules are to allow the worker nodes to access the public internet via the primary node's internet connection. This was due to their odd networking configuration where the primary node served as a router for the worker nodes.
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DwayneGit
commented on May 26, 2024
You are correct @justinabrahms but they should all be on the sames network in kubernetes so any node should be able to hit a cluster ip, which wasn't happening here.
They should all be using one point of contact to the outside world through the master node. Doing this wont create a public ip but will make sure the master is holding that access point should you create one eventually.
From my understanding that is what kubernetes should be doing. Im still learning though...
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DwayneGit
commented on May 26, 2024
Wait... Those may be the wrong commands though.. One moment. Ill double check
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DwayneGit
commented on May 26, 2024
I'm sorry you are right those were the wrong commands. you want these:
sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
sudo update-alternatives --set ebtables /usr/sbin/ebtables-legacy
Links:
"Kubernetes Raspberry Pi 4 Cluster"
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leonardas103
commented on May 26, 2024
@DwayneGit Thanks for your response. It seems that setting the iptables to legacy is critical for kubernetes with iptables-1.8.x.
Can someone please update the guide on k8s-on-raspbian/GUIDE.md to include this?
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