Service mongod does not start on Centos8 - mongodb

Question

I tried to install mongoDB on Centos8, but when I run the command
systemctl status mongod.service
I get this error:
● mongod.service - MongoDB Database Server
Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Sat 2020-08-01 14:26:53 CEST; 11min ago
Docs: https://docs.mongodb.org/manual
Process: 1875 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=14)
Process: 1873 ExecStartPre=/usr/bin/chmod 0755 /var/run/mongodb (code=exited, status=0/SUCCESS)
Process: 1871 ExecStartPre=/usr/bin/chown mongod:mongod /var/run/mongodb (code=exited, status=0/SUCCESS)
Process: 1869 ExecStartPre=/usr/bin/mkdir -p /var/run/mongodb (code=exited, status=0/SUCCESS)
Aug 01 14:26:53 db.localhost systemd[1]: Starting MongoDB Database Server...
Aug 01 14:26:53 db.localhost mongod[1875]: about to fork child process, waiting until server is ready for>
Aug 01 14:26:53 db.localhost mongod[1875]: forked process: 1877
Aug 01 14:26:53 db.localhost mongod[1875]: ERROR: child process failed, exited with 14
Aug 01 14:26:53 db.localhost mongod[1875]: To see additional information in this output, start without th>
Aug 01 14:26:53 db.localhost systemd[1]: mongod.service: Control process exited, code=exited status=14
Aug 01 14:26:53 db.localhost systemd[1]: mongod.service: Failed with result 'exit-code'.
Aug 01 14:26:53 db.localhost systemd[1]: Failed to start MongoDB Database Server.
I tried to check privileges for the folders: /var/lib/mongo and /var/log/mongodb
#/var/lib/
drwxr-xr-x. 4 mongod mongod 4096 Aug 1 14:44 mongo
#/var/log/
drwxr-xr-x. 2 mongod mongod 50 Aug 1 14:14 mongodb
In some other posts, people told to try this command:
sudo chown -R mongodb:mongodb /var/lib/mongodb/
but in don't have the user mongodb and I get the error: invalid user: 'mongodb:mongodb'!
In my /etc/passwd file the only user for mongo is this:
mongod:x:994:992:mongod:/var/lib/mongo:/bin/false
What's the problem?
Why I cannot run mongod.service?
Thanks for your support.
Added more informations:
systemctl cat mongod
[root#db tmp]# systemctl cat mongod
# /usr/lib/systemd/system/mongod.service
[Unit]
Description=MongoDB Database Server
Documentation=https://docs.mongodb.org/manual
After=network.target
[Service]
User=mongod
Group=mongod
Environment="OPTIONS=-f /etc/mongod.conf"
EnvironmentFile=-/etc/sysconfig/mongod
ExecStart=/usr/bin/mongod $OPTIONS
ExecStartPre=/usr/bin/mkdir -p /var/run/mongodb
ExecStartPre=/usr/bin/chown mongod:mongod /var/run/mongodb
ExecStartPre=/usr/bin/chmod 0755 /var/run/mongodb
PermissionsStartOnly=true
PIDFile=/var/run/mongodb/mongod.pid
Type=forking
# file size
LimitFSIZE=infinity
# cpu time
LimitCPU=infinity
# virtual memory size
LimitAS=infinity
# open files
LimitNOFILE=64000
# processes/threads
LimitNPROC=64000
# locked memory
LimitMEMLOCK=infinity
# total threads (user+kernel)
TasksMax=infinity
TasksAccounting=false
# Recommended limits for mongod as specified in
# https://docs.mongodb.com/manual/reference/ulimit/#recommended-ulimit-settings
[Install]
WantedBy=multi-user.target
mongod.conf
[root#db tmp]# cat /etc/mongod.conf
# ..
# mongod.conf
# for documentation of all options, see:
# http://docs.mongodb.org/manual/reference/configuration-options/
# where to write logging data.
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:
# wiredTiger:
# how the process runs
processManagement:
fork: true # fork and run in background
pidFilePath: /var/run/mongodb/mongod.pid # location of pidfile
timeZoneInfo: /usr/share/zoneinfo
# network interfaces
net:
port: 27017
bindIp: 127.0.0.1 # Enter 0.0.0.0,:: to bind to all IPv4 and IPv6 addresses or, alternatively, use the net.bindIpAll setting.
#security:
#operationProfiling:
#replication:
#sharding:
## Enterprise-Only Options
#auditLog:
#snmp:
/usr/bin/mongod -f /etc/mongod.conf
[root#db mongodb]# /usr/bin/mongod -f /etc/mongod.conf
about to fork child process, waiting until server is ready for connections.
forked process: 1959
child process started successfully, parent exiting

Answer 1

For some kind of reason, mongod want the folder /data/db and ignore the file mongod.conf
After I created these folders, if I run mongod command (with sudo), programme start "correctly".
But if I reboot the system, the service fails on boot and continue to have problems.