Step 1
I created /etc/init.d/disable-transparent-hugepages:
#!/bin/bash
### BEGIN INIT INFO
# Provides: disable-transparent-hugepages
# Required-Start: $local_fs
# Required-Stop:
# X-Start-Before: mongod mongodb-mms-automation-agent
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Disable Linux transparent huge pages
# Description: Disable Linux transparent huge pages, to improve
# database performance.
### END INIT INFO
# 2020-01-06 Dmitry Fedyuk
# "How to fix «/sys/kernel/mm/transparent_hugepage/enabled is 'always'.
# We suggest setting it to 'never'» for MongoDB?" https://df.tips/t/965
case $1 in
start)
thp_path=/sys/kernel/mm/transparent_hugepage
echo 'never' | tee ${thp_path}/enabled > /dev/null
echo 'never' | tee ${thp_path}/defrag > /dev/null
unset thp_path
;;
esac
Step 2
chmod 755 /etc/init.d/disable-transparent-hugepages
update-rc.d disable-transparent-hugepages defaults
reboot