部署k8s的kube-apiserver组件启动组件服务报Failed to start Kubernetes API Server.

报错现象如下：

[root@localhost kubernetes]# systemctl status kube-apiserver
● kube-apiserver.service - Kubernetes API Server
   Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Sat 2020-08-15 15:43:51 CST; 10s ago
     Docs: https://github.com/GoogleCloudPlatform/kubernetes
  Process: 56292 ExecStart=/usr/bin/kube-apiserver $KUBE_LOGTOSTDERR $KUBE_LOG_LEVEL $KUBE_ETCD_SERVERS $KUBE_API_ADDRESS $KUBE_API_PORT $KUBELET_PORT $KUBE_ALLOW_PRIV $KUBE_SERVICE_ADDRESSES $KUBE_ADMISSION_CONTROL $KUBE_API_ARGS (code=exited, status=255)
 Main PID: 56292 (code=exited, status=255)

Aug 15 15:43:50 localhost.localdomain systemd[1]: kube-apiserver.service: main process exited, code=exited, status=255/n/a
Aug 15 15:43:50 localhost.localdomain systemd[1]: Unit kube-apiserver.service entered failed state.
Aug 15 15:43:50 localhost.localdomain systemd[1]: kube-apiserver.service failed.
Aug 15 15:43:51 localhost.localdomain systemd[1]: kube-apiserver.service holdoff time over, scheduling restart.
Aug 15 15:43:51 localhost.localdomain systemd[1]: Stopped Kubernetes API Server.
Aug 15 15:43:51 localhost.localdomain systemd[1]: start request repeated too quickly for kube-apiserver.service
Aug 15 15:43:51 localhost.localdomain systemd[1]: Failed to start Kubernetes API Server.
Aug 15 15:43:51 localhost.localdomain systemd[1]: Unit kube-apiserver.service entered failed state.
Aug 15 15:43:51 localhost.localdomain systemd[1]: kube-apiserver.service failed.

查看系统日志：tailf -30 /var/log/messages

发现报Unable to perform initial IP allocation check: unable to refresh the service IP block: client: etcd cluster is unavailable or misconfigured; error #0: dial tcp 192.168.218.10:2379: getsockopt: connection refused，查看etcd的端口无法链接，猜想是etcd配置出现问题

查看etcd的配置信息，将原先的localhost修改为0.0.0.0

将apiserver组件配置也修改成0.0.0.0（主要原因）

重新启动etcd,然后启动kube-apiserver

kube-apiserver成功起来