故障：ERROR：ERROR: child process failed, exited with error number 51

现象：

启动mongodb时报错

分析：

因为这个实例正在运行中导致无法删除

解决：

1、关闭再开启

1 [root@server1 mongodb]# mongod -f /etc/mongod.conf --shutdown
2 killing process with pid: 18256
3 [root@server1 mongodb]# mongod -f /etc/mongod.conf
4 about to fork child process, waiting until server is ready for connections.
5 forked process: 35994
6 child process started successfully, parent exiting

2、杀死进程再开启

 1 [root@server1 ~]# netstat -anpt | grep mongod
 2 tcp        0      0 0.0.0.0:27019           0.0.0.0:*               LISTEN      55285/mongod        
 3 tcp        0      0 0.0.0.0:27020           0.0.0.0:*               LISTEN      55423/mongod        
 4 tcp        0      0 0.0.0.0:27017           0.0.0.0:*               LISTEN      54913/mongod        
 5 tcp        0      0 0.0.0.0:27018           0.0.0.0:*               LISTEN      55124/mongod
 6 [root@server1 mongodb]# kill 54913
 7 [root@server1 mongodb]# mongod -f /etc/mongod.conf
 8 about to fork child process, waiting until server is ready for connections.
 9 forked process: 25674
10 child process started successfully, parent exiting

问题解决