I was trying to upgrade mongo 3.4.20 to 4.0.14 , but it lead to the system crash, so i tried reverting it back to 3.4.20. But after doing db restart using fork , there 502 error. Please help.I tried the following command sudo mongod --fork --auth --logpath /var/log/mongodb/mongod.log

  • So, have you tried looking in /var/log/mongodb/mongod.log? – mustaccio Jan 16 at 19:16
  • Hey @mustaccio , thank you for the suggestion, yes , i did, and finally i got it resolved just now by running the fork command along with auth command in following manner : sudo mongod --fork --auth --port 27017 --dbpath /var/lib/mongodb --logpath /var/lib/mongodb/mongod.log – ramiya dash Jan 16 at 19:23

I could finally get it to work by executing following command :

sudo mongod --fork --auth --port 27017 --dbpath /var/lib/mongodb --logpath /var/lib/mongodb/mongod.log

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