How to repair Mongodb in Debian Linux on Unifi controller

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Encountered a Unifi controller that would not load the web interface. I discovered that the drive was full and had to be expanded.

In order to expand a volume in AWS I had to go through the standard process of - Creating a snapshot, create a volume from a snapshot, shut the instance down, detach, attach (New volume), and boot the instance back up again.

The instance booted back up and checking df -h everything looked good! The only issue is while looking at the logs I found the following error- DbServer not shutdown cleanly and need repairing on next startup. Performing a clean reboot did not resolve the issue.

I was able to find the correct process of repairing the database for Debian Linux.

service unifi stop  

mongod --dbpath /usr/lib/unifi/data/db --smallfiles --logpath /usr/lib/unifi/logs/server.log --repair  

service unifi start

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