ubuntu - 总是遇到 “Ambari Server not running, Stale PID File at:/var/run/ambari-server/ambari-server.pid”

Question

我是一个从apache用ambari学习Hadoop的新手，并且我一直试图在VirtualBox环境中的Ubuntu上安装ambari，但是，遇到问题让我筋疲力尽。

1，系统提醒我“Ambari服务器'启动'成功完成”如下

~# ambari-server start
Using python  /usr/bin/python2.7
Starting ambari-server
Ambari Server running with administrator privileges.
Organizing resource files at /var/lib/ambari-server/resources...
Server PID at: /var/run/ambari-server/ambari-server.pid
Server out at: /var/log/ambari-server/ambari-server.out
Server log at: /var/log/ambari-server/ambari-server.log
Waiting for server start...................
Ambari Server 'start' completed successfully.

但是，我无法通过“ http://127.0.0.1:8080”访问ambari服务，并且在按以下方式检查服务器状态时

~# ambari-server status
Using python  /usr/bin/python2.7
Ambari-server status
Ambari Server not running. Stale PID File at: /var/run/ambari-server/ambari-server.pid

当我检查/var/run/ambari-server/ambari-server.pid的文件时

~# cat /var/run/ambari-server/ambari-server.pid 
2875

当我检入日志文件时，它以以下几行开头

22 May 2015 10:59:42,876  INFO [main] Configuration:527 - Reading password from existing file
22 May 2015 10:59:43,073  INFO [main] Configuration:747 - Hosts Mapping File null
22 May 2015 10:59:43,074  INFO [main] HostsMap:60 - Using hostsmap file null
22 May 2015 10:59:45,169  INFO [main] ControllerModule:172 - Detected MYSQL as the database type from the JDBC URL
22 May 2015 10:59:45,253  INFO [main] ControllerModule:214 - Using c3p0 ComboPooledDataSource as the EclipsLink DataSource
22 May 2015 10:59:45,416  INFO [main] MLog:80 - MLog clients using log4j logging.
22 May 2015 10:59:46,124  INFO [main] C3P0Registry:204 - Initializing c3p0-0.9.1.1 [built 15-March-2007 01:32:31; debug? true; trace: 10]
22 May 2015 10:59:59,830 ERROR [main] DBAccessorImpl:99 - Error while creating database accessor 
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

我搜索了互联网，但没有找到解决该问题的方法。

顺便说一句，我还没有安装Hadoop，这是否是问题？

提前致谢。

Answer 1

终于成功了

我没有在后台运行命令，而是使用了nohup。有效。
下面给出了在远程计算机上执行的脚本的内容。

#!/bin/bash
nohup ambari-server start