有時會遇到CDH集群的7180頁面無法訪問，通過命令查看服務發現：

1 service --status-all 
2 cloudera-scm-server dead but pid file exists

刪除pid文件：　

1 rm -rf /var/run/cloudera-scm-server 　

然后啟動服務cloudera-scm-server時會遇到過一段時間自己掛掉，并返回cloudera-scm-server dead but pid file exists的問題，主要是在cloudera-scm-server-db沒有正常啟動的情況，表現為如下情況：

 1 [root@gyvm-4 data]# service cloudera-scm-server start  
 2 Starting cloudera-scm-server:                              [  OK  ]  
 3 [root@gyvm-4 data]#   
 4 [root@gyvm-4 data]# service cloudera-scm-server status  
 5 cloudera-scm-server (pid  60761) is running...  
 6 [root@gyvm-4 data]# service cloudera-scm-server status  
 7 cloudera-scm-server (pid  60761) is running...  
 8 [root@gyvm-4 data]# service cloudera-scm-server status  
 9 cloudera-scm-server (pid  60761) is running...  
10 [root@gyvm-4 data]# service cloudera-scm-server status  
11 cloudera-scm-server dead but pid file exists  

這時候想要完整重啟cloudera-scm server-db/server，發現cloudera-scm-server-db無法重啟

1 [root@gyvm-4 data]# service cloudera-scm-server-db stop
2 waiting for server to shut down............................................................... failed
3 pg_ctl: server does not shut down

無法停止server-db的原因是殘留了一個pid文件，status顯示不正確，刪除該文件，通過status查看，server-db其實已經停止了。

1 [root@gyvm-4 data]# cd /var/lib/cloudera-scm-server-db/data  
2 [root@gyvm-4 data]# service cloudera-scm-server-db status  
3 pg_ctl: server is running (PID: 17378)  
4 /usr/bin/postgres "-D" "/var/lib/cloudera-scm-server-db/data"  
5 [root@gyvm-4 data]# rm postmaster.pid  
6 rm: remove regular file `postmaster.pid'? y  
7 [root@gyvm-4 data]# service cloudera-scm-server-db status  
8 pg_ctl: no server running  

再次開啟server-db，成功，啟動server，成功。

1 [root@gyvm-4 data]# service cloudera-scm-server-db start  
2 DB initialization done.  
3 waiting for server to start.... done  
4 server started  
5 [root@gyvm-4 data]# service cloudera-scm-server start  
6 Starting cloudera-scm-server:                              [  OK  ]  

【結論】

　　究其原因，是cloudera-server-db沒有正常啟動，但是殘留了pid文件postmaster.pid，所以查看cloudera-server-db狀態時，顯示有誤，返回cloudera-server-db是啟動的狀態。在此基礎上，每次啟動cloudera-server就會失敗。

轉自：http://blog.csdn.net/c1990/article/details/54706330

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