CDH localhost:7180 頁面沒法打開

有時會遇到CDH集羣的7180頁面沒法訪問，經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 　

而後啓動服務cloudera-scm-server時會遇到過一段時間本身掛掉，並返回cloudera-scm-server dead but pid file exists的問題，主要是在cloudera-scm-server-db沒有正常啓動的狀況，表現爲以下狀況：

 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  

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

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

沒法中止server-db的緣由是殘留了一個pid文件，status顯示不正確，刪除該文件，經過status查看，server-db其實已經中止了。

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  

再次開啓server-db，成功，啓動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】

　　究其緣由，是cloudera-server-db沒有正常啓動，可是殘留了pid文件postmaster.pid，因此查看cloudera-server-db狀態時，顯示有誤，返回cloudera-server-db是啓動的狀態。在此基礎上，每次啓動cloudera-server就會失敗。

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