Mongod Service start exits with code 100

Question

Problem

My mongo service does not start anymore:

root@machine ~ # service mongod start
root@machine ~ # service mongod status
● mongod.service - High-performance, schema-free document-oriented database
   Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2017-08-15 12:03:51 CEST; 2s ago
     Docs: https://docs.mongodb.org/manual
  Process: 26942 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=100)
 Main PID: 26942 (code=exited, status=100)

Aug 15 12:03:50 machine systemd[1]: Started High-performance, schema-free document-oriented database.
Aug 15 12:03:51 machine systemd[1]: mongod.service: Main process exited, code=exited, status=100/n/a
Aug 15 12:03:51 machine systemd[1]: mongod.service: Unit entered failed state.
Aug 15 12:03:51 machine systemd[1]: mongod.service: Failed with result 'exit-code'.

Where exit code 100 is blurry defined as:

Returned by mongod when the process throws an uncaught exception.

What I did

First, I have installed my mongodb (3.4.7) on Ubuntu 16.04.2 LTS via the official guide.

Starting and stopping the service worked fine. So I continued to enable authentication (again via the official guide).

Then I added the service to be able to run on server startup.

root@machine ~ # systemctl enable mongod.service

mongod.conf

I also edited my config file, which is passed a yaml linter:

# Where and how to store data.
storage:
  dbPath: /var/lib/mongodb
  journal:
    enabled: true

#  engine: mmapv1
#  mmapv1:
#  wiredTiger:

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log

# network interfaces
net:
  port: 27017
  bindIp: 127.0.0.1


#processManagement:

security:
  authorization: enabled

The ownership of the file is

root@machine ~ # ls -la /etc/ | grep mongo
-rw-r--r--   1 root  root     599 Aug 15 11:42 mongod.conf

DbPath

I know there are issues with the dbpath so this is what /var/lib/mongodb has in terms of ownership:

root@ machine ~ # ls -la /var/lib/ | grep mongo
drwxr-xr-x  4 mongodb      mongodb      4096 Aug 15 11:54 mongodb

Service List

When listing all services via service --status-all there is no entry for any mongo related service.

Somebody has a clue what could cause the issue?

---

UPDATE

As suggested I ran the following command (with a slight modification):

root@machine ~ /usr/bin/mongod --verbose --config /etc/mongod.conf &
[1] 28495

When I get it right, this is a direct execute of the binary. This allows me now to at least login into mongo shell:

root@machine ~ # mongo
MongoDB shell version v3.4.7
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.7
> 

However, the service status is still remaining failed with exit code 100.

---

UPDATE UPDATE

When typing root@machine ~ # /usr/bin/mongod --verbose

I receive the following error:

2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] MongoDB starting : pid=28642 port=27017 dbpath=/data/db 64-bit host=machine
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] db version v3.4.7
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] git version: cf38c1b8a0a8dca4a11737581beafef4fe120bcd
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] allocator: tcmalloc
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] modules: none
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] build environment:
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten]     distmod: ubuntu1604
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten]     distarch: x86_64
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten]     target_arch: x86_64
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] options: { systemLog: { verbosity: 1 } }
2017-08-15T13:45:40.973+0200 D -        [initandlisten] User Assertion: 29:Data directory /data/db not found. src/mongo/db/service_context_d.cpp 98
2017-08-15T13:45:40.973+0200 I STORAGE  [initandlisten] exception in initAndListen: 29 Data directory /data/db not found., terminating
2017-08-15T13:45:40.973+0200 I NETWORK  [initandlisten] shutdown: going to close listening sockets...
2017-08-15T13:45:40.973+0200 I NETWORK  [initandlisten] shutdown: going to flush diaglog...
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] now exiting
2017-08-15T13:45:40.973+0200 I CONTROL  [initandlisten] shutting down with code:100

Answer 1

You may still have some problems with the permissions in your data directory. Especially if you have run mongod from the terminal to start with.

I find that the data files are created under root not the mongodb user when you run from the terminal. To fix ..

cd /var/lib/mongodb
sudo chown -R mongodb:mongodb *