k8s 常见报错处理

• [WARNING IsDockerSystemdCheck]: detected “cgroupfs” as the Docker cgroup driver. The recommended driver is “systemd”. Please follow the guide at https://kubernetes.io/docs/setup/cri/
  error execution phase preflight: [preflight] Some fatal errors occurred:

cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ]
}
EOF

mkdir -p /etc/systemd/system/docker.service.d

# Restart Docker
systemctl daemon-reload
systemctl restart docker

• [ERROR FileContent–proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1

echo “1” > /proc/sys/net/ipv4/ip_forward

• [ERROR DirAvailable–var-lib-etcd]: /var/lib/etcd is not empty

rm -rf /var/lib/etcd

• failed to load Kubelet config file /var/lib/kubelet/config.yaml
• unable to load client CA file /etc/kubernetes/pki/ca.crt
• failed to run Kubelet: unable to load bootstrap kubeconfig: stat /etc/kubernetes/bootstrap-kubelet.conf: no such file or directory

背景：node 节点 kubeadm reset 后 重新kubeadm join失败

• Failed to execute iptables-restore: exit status 1（invalid option – ‘5’）

  解决：降低iptables版本，当前iptables-1.4.21-28.el7.x86_64，回滚为iptables-1.4.21-24.el7.x86_64 （centos7.5）

• Error from server (Forbidden): secrets is forbidden: User “system:node:master” cannot create resource “secrets” in API group “” in the namespace “kube-system”: can only read resources of this type

export KUBECONFIG=/etc/kubernetes/admin.conf

• Error from server (AlreadyExists): secrets “kubernetes-dashboard-certs” already exists

kubectl delete -f kubernetes-dashboard.yaml 重新apply

• The Service “kubernetes-dashboard” is invalid: spec.ports[0].nodePort: Forbidden: may not be used when type is ‘ClusterIP’

kubectl -n kube-system describe $(kubectl -n kube-system get secret -n kube-system -o name | grep namespace) | grep token

更改ClusterIP 为NodePort