Execute o seguinte comando:
sudo rm /var/lib/mongodb/mongod.lock
sudo service mongod restart
Conexão recusada ao MongoDB errno 111
MacOS:
rm /usr/local/var/mongodb/mongod.lock
sudo service mongod restart
sudo rm /var/lib/mongodb/mongod.lock
sudo service mongod restart
rm /usr/local/var/mongodb/mongod.lock
sudo service mongod restart