os_tweaks.sh #8

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#!/bin/bash
#==============================================================================
# Copyright and license info is available in the LICENSE file included with
# the Server Deployment Package (SDP), and also available online:
# https://swarm.workshop.perforce.com/projects/perforce-software-sdp/view/main/LICENSE
#------------------------------------------------------------------------------
set -u

# Usage (bash syntax):
# ./os_tweaks.sh 2>&1 | tee /tmp/os_tweaks.log

# This script checks, and if need be sets, certain OS parameters per
# Perforce recommendations: http://answers.perforce.com/articles/KB/3005#LINUX

# Following is a sample manual session:
# ROOT@perforce1:/root cat /sys/kernel/mm/transparent_hugepage/khugepaged/defrag
# [yes] no
# ROOT@perforce1:/root cat /sys/kernel/mm/transparent_hugepage/defrag
# [always] madvise never
# ROOT@perforce1:/root cat /sys/kernel/mm/transparent_hugepage/enabled
# [always] madvise never
# ROOT@perforce1:/root echo no > /sys/kernel/mm/transparent_hugepage/khugepaged/defrag
# ROOT@perforce1:/root echo never > /sys/kernel/mm/transparent_hugepage/defrag
# ROOT@perforce1:/root echo never > /sys/kernel/mm/transparent_hugepage/enabled
# ROOT@perforce1:/root cat /sys/kernel/mm/transparent_hugepage/khugepaged/defrag
# yes [no]
# ROOT@perforce1:/root cat /sys/kernel/mm/transparent_hugepage/defrag
# always madvise [never]
# ROOT@perforce1:/root cat /sys/kernel/mm/transparent_hugepage/enabled
# always madvise [never]

function msg () { echo -e "$*"; }
function bail () { msg "\\n${1:-Unknown Error}\\n"; exit "${2:-1}"; }

declare -i i=0
declare -a Files
declare -i ChangesNeeded=0
declare -a CurrentValues
declare -a CorrectValues
declare CurrentValue=
declare Version=1.2.0

# Static Data
Files[0]=/sys/kernel/mm/transparent_hugepage/khugepaged/defrag
Files[1]=/sys/kernel/mm/transparent_hugepage/defrag
Files[2]=/sys/kernel/mm/transparent_hugepage/enabled

# The format of one of the files varies by kernel version, either
# numeric or string format.  Figure out what format it is, and
# set the correct value based on the format of the current value.
if [[ -r "${Files[0]}" ]]; then
   CurrentValue=$(cat ${Files[0]})
   if [[ $CurrentValue =~ ^[0-9]{1}$ ]]; then
      CorrectValues[0]="0"
   else
      CorrectValues[0]="no"
   fi
fi

[[ $(whoami) == root ]] || bail "This must be run as root."

CorrectValues[1]="never"
CorrectValues[2]="never"

msg "\\nStarted ${0##*/} v$Version at $(date) on host ${HOSTNAME%%.*}.\\n"

while [[ $i -lt ${#Files[*]} ]]; do
   if [[ -r "${Files[$i]}" ]]; then
      CurrentValue=$(cat "${Files[$i]}")
      CurrentValue=${CurrentValue#*\[}
      CurrentValue=${CurrentValue%\]*}
      CurrentValues[$i]="$CurrentValue"
   else
      bail "Expected file does not exist: ${Files[$i]}"
   fi

   echo -e -n "File:        : ${Files[$i]}\nCurrent Value: ${CurrentValues[$i]}\nCorrect Value: ${CorrectValues[$i]}"

   if [[ "$CurrentValue" == "${CorrectValues[$i]}" ]]; then
      msg " (OK)\\n"
   else
      msg " (Needs to be adjusted)\\n"
      ChangesNeeded=$((ChangesNeeded+1))
   fi

   i=$((i+1))
done

if [[ $ChangesNeeded -eq 0 ]]; then
   msg "Verified: No changes to the OS parameters checked by this script are needed.\\n"
   exit 0
else
   msg "Detected $ChangesNeeded of ${#Files[*]} OS parameters needing to be updated.\\n"
fi

msg "Making updates.\\n"
i=0
while [[ $i -lt ${#Files[*]} ]]; do
   CurrentValue=$(cat ${Files[$i]})
   CurrentValue=${CurrentValue#*\[}
   CurrentValue=${CurrentValue%\]*}

   [[ "$CurrentValue" == "${CorrectValues[$i]}" ]] && continue

   msg "Setting value to ${CorrectValues[$i]} in ${Files[$i]}"
   echo "${CorrectValues[$i]}" > "${Files[$i]}" || bail  "Failed to set value in ${Files[$i]}."

   i=$((i+1))
done

msg "\\nRechecking files after making updates.\\n"
i=0
ChangesNeeded=0

while [[ $i -lt ${#Files[*]} ]]; do
   CurrentValue=$(cat ${Files[$i]})
   CurrentValue=${CurrentValue#*\[}
   CurrentValue=${CurrentValue%\]*}

   echo -e -n "File:        : ${Files[$i]}\nCurrent Value: $CurrentValue\nCorrect Value: ${CorrectValues[$i]}"

   if [[ "$CurrentValue" == "${CorrectValues[$i]}" ]]; then
      msg " (OK)\\n"
   else
      msg " (Still needs to be adjusted)\\n"
      ChangesNeeded=$((ChangesNeeded+1))
   fi

   i=$((i+1))
done

if [[ $ChangesNeeded -eq 0 ]]; then
   msg "Done. All OS parameters needing updates have been made.\\n"
else
   bail "Some OS parameter updates failed.  See output above.\\n"
fi

# Change User Description Committed
#8 26904 C. Thomas Tyler Added stock SDP copyright.
No functional change.
#7 26239 C. Thomas Tyler Upgraded to drop Linux flavor detection, since these are kernel parameters
not dependent on the Linux flavor.
#6 25868 C. Thomas Tyler Added support for Ubuntu 16.04, 18.04.
#5 23733 C. Thomas Tyler Fixed "supported OS" safety-check in os_tweaks to run on all RHEL/CentOS 6/7 versions.
#4 22890 C. Thomas Tyler Adapted to 'Maipo' codename for RHEL 7 release now visible in
/etc/redhat-release on RHEL/CentOS 7.4 systems.
#3 22621 C. Thomas Tyler Corrected OS version check to work on all CentOS 6.x releases,
not just Santiago (6.8).
#2 21175 C. Thomas Tyler Merge down of os_tweaks.sh from main.
#1 20262 C. Thomas Tyler Added utility script to make recommended OS tweaks.
 This script
checks current values, and makes updates if needed.  It must
be run as root, and is only tested on RHEL/CentOS (and has built-in
safety features).