報錯如下：

[[email protected] sbin]$ ./start-dfs.sh

18/01/24 22:46:38 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting namenodes on [hadoop000]
hadoop000: ssh: connect to host hadoop000 port 22: Connection timed out
hadoop000: ssh: connect to host hadoop000 port 22: Connection timed out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: secondarynamenode running as process 3195. Stop it first.

18/01/24 22:48:48 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

解決過程：

 1、ifconfig看了下ip地址

2、在cmd上ping了下，發現並無問題

3、使用sudo service iptables status命令檢視防火牆狀態，也沒有問題

[[email protected] ~]$ sudo service iptables status
iptables: Firewall is not running.

我們使用sudo chkconfig iptables off來永久關閉防火牆，如果使用sudo service iptables stop將臨時關閉防火牆，會在下一次關機重啟後重置，建議使用第一種

4、最後看了下 sudo vi /etc/hosts

終於找到問題，原來是ip配錯了