🛠️ Устранение неполадок kubectl Ошибка: The connection to the server 10.2.67.201:6443 was refused – did you specify the right host or port?

Этот документ описывает шаги для устранения ошибки kubectl:

The connection to the server x.x.x.x:6443 was refused - did you specify the right host or port?

$ env | grep -i kube
KUBECONFIG=/root/.kube/config

$ systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/docker.service.d
└─docker-sysconfig.conf, http-proxy.conf, nfs.conf
Active: active (running) since Wed 2019-01-30 13:14:36 NZDT; 21h ago
Docs: https://docs.docker.com
Main PID: 5834 (dockerd)
Tasks: 89
Memory: 189.2M
...

$ systemctl status kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubeadm.conf
Active: active (running) since Thu 2019-01-31 10:36:55 NZDT; 8min ago
Docs: http://kubernetes.io/docs/
Main PID: 16249 (kubelet)
Tasks: 18
Memory: 48.4M
...

Unit kubelet.service entered failed state.
systemd[1]: kubelet.service failed.

Попробуйте:

swapoff -a

# netstat -pnlt | grep 6443
tcp6 0 0 :::6443 :::* LISTEN 4546/kube-apiserver

$ firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: eno1
sources:
services: ssh dhcpv6-client
ports: 10250/tcp 8472/udp 6443/tcp
protocols:
masquerade: yes
forward-ports:
source-ports:
icmp-blocks:
rich rules:

# journalctl -xeu kubelet

6. Попробуйте перезапустить кластер Kubernetes, который также выполнит некоторые основные проверки:

$ kubeadm-setup.sh restart
Restarting containers now ...
Detected node is master ...
Checking if env is ready ...
Checking whether docker can pull busybox image ...
Checking access to ca-docker-registry.us.oracle.com/kubernetes_developer ...
Trying to pull repository ca-docker-registry.us.oracle.com/kubernetes_developer/pause-amd64 ...
3.0: Pulling from ca-docker-registry.us.oracle.com/kubernetes_developer/pause-amd64
Digest: sha256:f037e4f1990d76b0711e00035d0aeb0869ff9c4ece517e0a90af4ea3f601760e
Status: Image is up to date for ca-docker-registry.us.oracle.com/kubernetes_developer/pause-amd64:3.0
Checking firewalld settings ...
Checking iptables default rule ...
Checking br_netfilter module ...
Checking sysctl variables ...
Restarting kubelet ...
Waiting for node to restart ...
....
Restarting pod kube-flannel-ds-6htqw
pod "kube-flannel-ds-6htqw" deleted
Restarting pod kube-flannel-ds-fmjjw
pod "kube-flannel-ds-fmjjw" deleted
Restarting pod kube-flannel-ds-j982j
pod "kube-flannel-ds-j982j" deleted
Master node restarted. Complete synchronization between nodes may take a few minutes.