一、使用 kubeadm 初始化k8s集群时报错
this Docker version is not on the list of validated version：20.10.18. Latest validated version：19.03：
# 如果kubernets初始化时失败后，第二次再次执行会初始化命令会报错，这时需要进行重置
[init] Using Kubernetes version: v1.20.9
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
[ERROR FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists
[ERROR FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists
[ERROR FileAvailable--etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists
[ERROR Port-10250]: Port 10250 is in use
[ERROR DirAvailable--var-lib-etcd]: /var/lib/etcd is not empty
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher解决办法：
#1. 查看当前docker版本
docker version
#2. 查看当前仓库支持的docker版本
yum list docker-ce --showduplicates | sort -r
#3. 降低docker版本到19.03.9.ce-3.el7
yum downgrade --setopt=obsoletes=0 -y docker-ce-19.03.9-3.el7 docker-ce-cli-19.03.9-3.el7 containerd.io
#4. 再次查看docker 版本是否为19.03
docker version
#5. 修改为docker 和 k8s 的 cgroup driver 一致，k8s 的是 systemd ，而 docker 是cgroupfs。三台机子都要修改：
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
systemctl restart docker
#6. 重置
kubeadm reset
#7. 再次初始化即可版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
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