Error: child process failed, exited with error number 1

It’s usually a matter of permissions, or there is no corresponding path

Check steps: add a parameter after startup to export the log to a writable directory

./mongod –fork –logpath=/tmp/ mongod.log

Then look at the questions as follows:

2017-02-22T01:33:34.229+0800 I CONTROL  [main] ERROR: Cannot write pid file to /var/run/mongodb/ mongod.pid : No such file or directory

This means that there is no such directory (/ var/run/mongodb /)

Then create a new one, MKDIR – P/var/run/mongodb/

The normal restart is as follows:

root@sz :~/soft/mongodb342/bin# ./mongod -f  /etc/mongodb/ mongod.conf
about to fork child process, waiting until server is ready for connections.
forked process: 7482
child process started successfully, parent exiting