How to avoid transparent_hugepage/defrag warning from mongodb?

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Official MongoDB documentation gives several solutions for this issue. You can also try this solution, which worked for me:

Note: Try official documentation directives if MongoDB version is greater than 3.0

  1. Open /etc/init.d/mongod file.
    (if no such file you might check /etc/init.d/mongod, /etc/init/mongod.conf files – credit: the below comments)

  2. Add the lines below immediately after chown $DAEMONUSER /var/run/mongodb.pid and before end script.

  3. Restart mongod (service mongod restart).

Here are the lines to add to /etc/init.d/mongod:

if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi

That’s it!

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