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kubernetes - kubernetes can not join workers centos 7

问题描述

My issue is that I can not connect between our machines (master and slaves) My connection command should be 

kubeadm join xxx:xxx:xxx:xxx:6443 --token a72x22.ofmqdjyzi7ot4l70     --discovery-token-ca-cert-hash sha256:3cfd9ddb1e655ef2172c12d914e2bb001434cc4c8a756919a7a6a9f0603e3131

I have been execute 

echo 1 >/proc/sys/net/bridge/bridge-nf-call-iptables
echo 1 >/proc/sys/net/ipv4/ip_forward
swapoff -a

and I got the error

[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace error execution phase kubelet-start: configmaps "kubelet-config-1.15" is forbidden: User "system:bootstrap:a61x22" can

not get resource "configmaps" in API group "" in the namespace "kube-system"

master kubectl version 

Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-19T16:40:16Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"} Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.3", GitCommit:"5e53fd6bc17c0dec8434817e69b04a25d8ae0ff0", GitTreeState:"clean", BuildDate:"2019-06-06T01:36:19Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}

slaves kubectl version

Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-19T16:40:16Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}
The connection to the server localhost:8080 was refused - did you specify the right host or port?

maybe my issue is connected to the host or port?

how can I solve this issue?

标签： kubernetescentos7kubeadm

解决方案

Check if configmaps "kubelet-config-1.15" exists with the command below.

kubectl -n kube-system get configmap kubelet-config-1.15

Maybe your master is at version 1.14 and your new node downloaded a kubelet version 1.15. In that case your configmap didn't exists and you have a configmap kubelet-config-1.14. Upgrade your master node to v 1.15 or install kubernetes v1.14 into your worker node.

You can see what version your nodes are with

kubectl get nodes

[root@master /]# k get nodes

NAME STATUS ROLES AGE VERSION

master Ready master 32d v1.14.0

node6 Ready 32d v1.14.2

nodo2 Ready 32d v1.14.2

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