Cannot launch Mongod v4.4.5 on Ubuntu 20.04.2 LTS

Ops and Admin
1

Hi everyone,

I’ve installed Mongod v4.4.5 on Ubuntu 20.04.2 LTS but the service cannot be launched.

First off, systemctl start mongod shows the following output:

● mongod.service - MongoDB Database Server
     Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
     Active: failed (Result: core-dump) since Sun 2021-05-02 18:04:11 CEST; 39min ago
       Docs: https://docs.mongodb.org/manual
    Process: 21721 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=dumped, signal=ABRT)
   Main PID: 21721 (code=dumped, signal=ABRT)

May 02 18:04:10 Hakim systemd[1]: Started MongoDB Database Server.
May 02 18:04:11 Hakim systemd[1]: mongod.service: Main process exited, code=dumped, status=6/ABRT
May 02 18:04:11 Hakim systemd[1]: mongod.service: Failed with result 'core-dump'.

Is this due to the ulimit restrictions mentioned in recommended-ulimit-settings?

Below is the relevant output from journalctl -xe after starting the service with systemctl start mongod:

-- The unit UNIT has successfully entered the 'dead' state.
May 02 18:48:18 Hakim sudo[23430]: pam_unix(sudo:session): session closed for user root
May 02 18:48:22 Hakim sudo[23436]:    hakim : TTY=pts/3 ; PWD=/etc/apt/sources.list.d ; USER=root ; COMMAND=/bin/systemctl start mongod
May 02 18:48:22 Hakim sudo[23436]: pam_unix(sudo:session): session opened for user root by hakim(uid=0)
May 02 18:48:22 Hakim systemd[1]: Started MongoDB Database Server.
-- Subject: A start job for unit mongod.service has finished successfully
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit mongod.service has finished successfully.
-- 
-- The job identifier is 2687.
May 02 18:48:22 Hakim sudo[23436]: pam_unix(sudo:session): session closed for user root
May 02 18:48:23 Hakim systemd[1]: mongod.service: Main process exited, code=dumped, status=6/ABRT
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- An ExecStart= process belonging to unit mongod.service has exited.
-- 
-- The process' exit code is 'dumped' and its exit status is 6.
May 02 18:48:23 Hakim systemd[1]: mongod.service: Failed with result 'core-dump'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- The unit mongod.service has entered the 'failed' state with result 'core-dump'.
May 02 18:48:24 Hakim sudo[23462]:    hakim : TTY=pts/4 ; PWD=/home/hakim/repos/webapp ; USER=root ; COMMAND=/bin/journalctl -xe
May 02 18:48:24 Hakim sudo[23462]: pam_unix(sudo:session): session opened for user root by hakim(uid=0)
2

Please share the content of your configuration file:

Most likely you did not create the required directories.

3

Most likely you did not create the required directories.

Please find it below (I haven’t modified it as I’m not familiar with Mongodb yet):

# mongod.conf

# for documentation of all options, see:
#   http://docs.mongodb.org/manual/reference/configuration-options/

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


# how the process runs
processManagement:
  timeZoneInfo: /usr/share/zoneinfo

#security:

#operationProfiling:

#replication:

#sharding:

## Enterprise-Only Options:

#auditLog:

#snmp:
4

Share output of

ls -ld /var/lib/mongodb /var/log/mongodb/

5

I looks like I got it fixed. All I had to do was to remove the database and log files as mentioned in the docs after deleting Mongodb with apt purge, and then reinstalling it from scratch.

I think it might’ve been caused by an old installation of Mongodb that created the databases (and I didn’t bother deleting them when Mongodb was removed).
Thanks for your help.

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6

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