why can't I start the mongodb

Question

this is the error:

(mysite)zjm1126@zjm1126-G41MT-S2:~$ /usr/local/mongodb/bin/mongod 
/usr/local/mongodb/bin/mongod --help for help and startup options
Wed A         


        

Answer 1

On Mac OSX Yosemite after standard install with brew:

sudo chown -R `id -u` /data/db

if it not starts (check if there are no hanging and blocking connections):

lsof -i:27017

outputs something like:

COMMAND   PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
mongod  16948 andi    8u  IPv4 0x883a71bc9412939d      0t0  TCP *:27017 (LISTEN)

take value of PID and run:

kill -9 <PID>

now you should be able to start mongo server: mongod and then e.g in separate console window connect to it with mongo

Answer 2

I resolved this by doing a chown on mongodb ie.

sudo chown -R mongodb:mongodb /data

This is because, when you do

ls -lrth /data
drwxr-xr-x 2 mongodb mongodb  6 Jan  5 02:31 journal
-rwxr-xr-x 1 mongodb mongodb  0 Jan  5 02:31 mongod.lock
drwxr-xr-x 2 ubuntu  root    24 May  8 20:02 configdb

Hope this helps.

Answer 3

Either sudo the call to mongod or change the permissions of /data/db/mongod.lock so that it is writable by you.

Answer 4

Make sure you do not have a mongod instance running.

This is what worked for me. I checked to see if there was an instance running in the background at first by looking in the terminal like this: ps aux | grep mongo

and I saw that there was: 48358 bla bla mongod

so I killed it: kill 48358

and then I was able to run it fine.

Answer 5

If you want to rescue a member of a replica set don't use this methods described above. Instead use the procedures described in the ReSync-documentation of MongoDB.

Answer 6

Here, how i solved it

1. After removing lock file I repaired it using sudo mongod --repair --config=/etc/mongodb.conf, After this I Checked mongod.lock permission using ls -l /var/lib/mongodb/mongod.lock
2. it was showing root is owner of lock file, so i changed it back to mongodb using sudo chown mongodb:mongodb /var/lib/mongodb/*
3. then restart mongodb service using sudo service mongodb restart