Error: couldn't connect to server 127.0.0.1:27017 src/mongo/shell/mongo.js:91

Error: couldn't connect to server 127.0.0.1:27017 src/mongo/shell/mongo.js:91
exception: connect failed

check the /etc/mongodb.conf

look for dbpath

no go to that folder, by default it is /var/lib/mongodb . Remove the .lock file and then start mongodb

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