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I've a Google cloud VM with MongoDB server running for many months. Today the VM restarted and MongoDB won't run as a service (i can run it mannualy as a process and starts OK).

• OS: CentOS 7
• MongoDB Verion: 3.2.16

The error thrown:

>sudo service mongod start

Starting mongod (via systemctl):  Job for mongod.service failed because the control process exited with error code. See "systemctl status mongod.service" and "journalctl -xe" for details.
                                                           [FAILED]

So if i run "systemctl status mongod.service":

>sudo systemctl status mongod.service

mongod.service - SYSV: Mongo is a scalable, document-oriented database.
   Loaded: loaded (/etc/rc.d/init.d/mongod; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2018-02-05 18:05:49 UTC; 1min 20s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 3755 ExecStart=/etc/rc.d/init.d/mongod start (code=exited, status=1/FAILURE)

Feb 05 18:05:49 todoturnos-testing systemd[1]: Starting SYSV: Mongo is a scalable, document-oriented database....
Feb 05 18:05:49 todoturnos-testing runuser[3762]: pam_unix(runuser:session): session opened for user mongod by (uid=0)
Feb 05 18:05:49 todoturnos-testing mongod[3755]: Starting mongod: [FAILED]
Feb 05 18:05:49 todoturnos-testing systemd[1]: mongod.service: control process exited, code=exited status=1
Feb 05 18:05:49 todoturnos-testing systemd[1]: Failed to start SYSV: Mongo is a scalable, document-oriented database..
Feb 05 18:05:49 todoturnos-testing systemd[1]: Unit mongod.service entered failed state.
Feb 05 18:05:49 todoturnos-testing systemd[1]: mongod.service failed.

If i run "journalctl -xe"

>sudo journalctl -xe

Feb 05 18:09:58 todoturnos-testing sudo[3827]: janokpodelmundi : TTY=pts/0 ; PWD=/usr/lib/tmpfiles.d ; USER=root ; COMMAND=/sbin/service mongod start
Feb 05 18:09:58 todoturnos-testing polkitd[348]: Registered Authentication Agent for unix-process:3847:870363 (system bus name :1.242 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /or
Feb 05 18:09:58 todoturnos-testing systemd[1]: Starting SYSV: Mongo is a scalable, document-oriented database....
-- Subject: Unit mongod.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mongod.service has begun starting up.
Feb 05 18:09:58 todoturnos-testing runuser[3860]: pam_unix(runuser:session): session opened for user mongod by (uid=0)
Feb 05 18:09:58 todoturnos-testing runuser[3860]: pam_unix(runuser:session): session closed for user mongod
Feb 05 18:09:58 todoturnos-testing mongod[3853]: Starting mongod: [FAILED]
Feb 05 18:09:58 todoturnos-testing systemd[1]: mongod.service: control process exited, code=exited status=1
Feb 05 18:09:58 todoturnos-testing systemd[1]: Failed to start SYSV: Mongo is a scalable, document-oriented database..
-- Subject: Unit mongod.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mongod.service has failed.
-- 
-- The result is failed.
Feb 05 18:09:58 todoturnos-testing systemd[1]: Unit mongod.service entered failed state.
Feb 05 18:09:58 todoturnos-testing systemd[1]: mongod.service failed.
Feb 05 18:09:58 todoturnos-testing polkitd[348]: Unregistered Authentication Agent for unix-process:3847:870363 (system bus name :1.242, object path /org/freedesktop/PolicyKit1/AuthenticationAgent,
Feb 05 18:10:00 todoturnos-testing sudo[3866]: janokpodelmundi : TTY=pts/0 ; PWD=/usr/lib/tmpfiles.d ; USER=root ; COMMAND=/bin/journalctl -xe
lines 2280-2321/2321 (END)

Where "janokpodelmundi" is my username.

So, i have disabled SELINUX as i know it could be related with this problem, but didn't resolved it. I've also changed the "pid" file location to ensure the permissions are OK,and had disabled forking in the config as well.

My mongodb config:

systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log

# Where and how to store data.
storage:
  dbPath: /var/lib/mongo
  journal:
    enabled: true
#  engine:
#  mmapv1:
#  wiredTiger:

# how the process runs
processManagement:
  fork: true  # fork d run in background
  pidFilePath: /var/run/mongo/mongod.pid  # location of pidfile

# network interfaces
net:
  port: 27017
 bindIp: 0.0.0.0   # Listen to local interface only, comment to listen on all interfaces.

The mongodb log is empty, and it's not generating rows at any time.

I have been trying many alternatives i've found on internet but the problem persists.

Any help would be great.

Solution: After trying the "mongod -f /path-to-config-file" and getting the "incorrect YAML" error at line 29, i pasted from original mongo conf the lines 26-29:

# network interfaces
net:
  port: 27017
  bindIp: 0.0.0.0  #

After that i tried again the "mongod -f path-to-config-file" and succeed.

Answers

YAML files require spaces for indentation and not tabs. Seems that you have a funny character/indent within your conf file. The easiest way to debug this is to start off with a basic conf file and add in options and make sure your indents etc are correct before adding another option