I was able to cluster 2 nodes together in Kubernetes. The master node seems to be running fine but running any command on the worker node results in the error: "The connection to the server localhost:8080 was refused - did you specify the right host or port?"
From master (node1),
$ kubectl get nodes
NAME STATUS AGE VERSION
node1 Ready 23h v1.7.3
node2 Ready 23h v1.7.3
From worker (node 2),
$ kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?
$ telnet localhost 8080
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
$ ping localhost
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.032 ms
I am not sure how to fix this issue. Any help is appreciated.
On executing,"journalctl -xeu kubelet" I see: "CNI failed to retrieve network namespace path: Cannot find network namespace for the terminated container", but this seems to be related to installing a pod network ... which I am not able to because of the above error.
Thanks!
The solution for this issue is to use appropriate user to use kubectl. Don't use sudo. Using sudo will give error.
So if in a browser, if http://localhost:8080 is entered, it simply means to server web-pages from local web-server which is listening for web-requests on 8080 port. The machine might not be connected to internet at all and still web-pages can be rendered in browser from local hard-drive.
kubectl
interfaces with kube-apiserver
for cluster management. The command works on the master node because that's where kube-apiserver
runs. On the worker nodes, only kubelet
and kube-proxy
is running.
In fact, kubectl
is supposed to be run on a client (eg. laptop, desktop) and not on the kubernetes nodes.
from master you need ~/.kube/config pass this file as argument for kubectl command. Copy the config file to other server or laptop then pass the argument as for kubectl
command
eg:
kubectl --kubeconfig=~/.kube/config
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