Suddenly, mongod is not starting

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I had the same problem, and fixed mine. Apparently the snap tried to ‘jump’ too many mongodb versions?
NOTE: this ‘repair’ might get broken by the devs when they fix this.
I’m running snaps, your mileage might vary.

I fixed mine

  • I got a copy of mongodb 3.4 from https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.23.tgz (the “linux legacy” release) and unpacked it into root’s home folder

  • I cd’d into the unpacked directory/bin and ran

  • ./mongod --repair --dbpath /var/snap/rocketchat-server/common/

  • then

  • ./mongod --dbpath /var/snap/rocketchat-server/common/

  • then in a separate session I ran ./mongo

  • issued the command
    db.adminCommand( { setFeatureCompatibilityVersion: “3.4” } )

  • exited mongo

  • exited mongod (with ctrl-c)

  • cd’d to /snap/rocketchat-server/current/bin

  • ran
    ./mongod --repair --dbpath /var/snap/rocketchat-server/common/

  • waited for it to finish

  • rebooted (probably unnecessary)

  • logged in (as I was impatient) and did
    tail -f /var/log/daemon.log

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