解决：Failed to start Etcd Server.

etcd启动不了，报：
Job for etcd.service failed because the control process exited with error code. See “systemctl status etcd.service” and “journalctl -xe” for details

[root@master1 opt]# systemctl start etcd
Job for etcd.service failed because the control process exited with error code. See "systemctl status etcd.service" and "journalctl -xe" for details.
[root@master1 opt]# 

执行journalctl -xe查看详细信息，

根据详细信息，好像空间不够了，继续查看空间占用情况

主机共40G，这个log占了35G，

解决：
释放空间即可。
由于是测试虚拟机，直接删除日志文件

[root@master1 kubernetes]# ls
bin  cfg  logs  ssl
[root@master1 kubernetes]# du -h logs/
35G     logs/
[root@master1 kubernetes]# rm -rf logs/*
[root@master1 kubernetes]# du -h logs/  
0       logs/
[root@master1 kubernetes]# 

成功启动

[root@master1 kubernetes]# systemctl start etcd
[root@master1 kubernetes]# netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 192.168.139.130:2379    0.0.0.0:*               LISTEN      15471/etcd          
tcp        0      0 192.168.139.130:2380    0.0.0.0:*               LISTEN      15471/etcd          
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      6462/sshd           
tcp6       0      0 :::22                   :::*                    LISTEN      6462/sshd           
[root@master1 kubernetes]#