[root@k8s-1 ~]# kubeadm init --config config 
[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
[init] Using Kubernetes version: v1.8.1
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks
[preflight] Some fatal errors occurred:
couldn‘t parse external etcd version "": Version string empty
[preflight] If you know what you are doing, you can skip pre-flight checks with `--skip-preflight-checks`

使用kubeadm安裝Kubernetes出現報錯，

couldn‘t parse external etcd version "": Version string empty

意思是：無法獲取ETCD的版本號。

多半是配置文件有誤，或者etcd監聽了127.0.0.1，別人訪問不到。導致無法獲取版本號號碼。

etcd默認監聽127.0.0.1

[root@k8s-1 ~]# netstat -tunlp |grep etcd
tcp        0      0 127.0.0.1:2379          0.0.0.0:*               LISTEN      23155/etcd          
tcp        0      0 127.0.0.1:2380          0.0.0.0:*               LISTEN      23155/etcd          
[root@k8s-1 ~]#

使用如下命令調通即可。

#  curl -L http://10.140.1.40:2379/version
{"etcdserver":"3.2.7","etcdcluster":"3.2.0"}

couldn't parse external etcd version "": Version string empty