#!/bin/bash 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 bail () { echo -e "\nError: ${1:-Unknown Error}\n"; exit ${2:-1}; } declare -i i=0 declare -a Files declare -i ChangesNeeded=0 declare -a CurrentValues declare -a CorrectValues declare CurrentValue declare Version=1.0.1 # Static Data Files[0]=/sys/kernel/mm/transparent_hugepage/khugepaged/defrag Files[1]=/sys/kernel/mm/transparent_hugepage/defrag Files[2]=/sys/kernel/mm/transparent_hugepage/enabled # Usage Verification. [[ -r /etc/redhat-release ]] || bail "This is only tested on RHEL/CentOS." if [[ -n "$(grep '(Santiago)' /etc/redhat-release)" ]]; then echo -e "Verified: Running on supported OS (CentOS 6)." CorrectValues[0]="no" elif [[ -n "$(grep '(Core)' /etc/redhat-release)" ]]; then echo -e "Verified: Running on supported OS (CentOS 7)." CorrectValues[0]="0" else bail "This is only tested on RHEL/CentOS 6 (Santiago)." fi [[ $(whoami) == root ]] || bail "This must be run as root." CorrectValues[1]="never" CorrectValues[2]="never" echo -e "\nStarted ${0##*/} v$Version at $(date) on $(hostname --fqdn).\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 -n -e "File: : ${Files[$i]}\nCurrent Value: ${CurrentValues[$i]}\nCorrect Value: ${CorrectValues[$i]}" if [[ "$CurrentValue" == "${CorrectValues[$i]}" ]]; then echo -e " (OK)\n" else echo -e " (Needs to be adjusted)\n" ChangesNeeded=$((ChangesNeeded+1)) fi i=$((i+1)) done if [[ $ChangesNeeded -eq 0 ]]; then echo -e "Verified: No changes to the OS parameters checked by this script are needed.\n" exit 0 else echo -e "Detected $ChangesNeeded of ${#Files[*]} OS parameters needing to be updated.\n" fi echo -e "Making updates.\n" i=0 while [[ $i -lt ${#Files[*]} ]]; do CurrentValue=$(cat ${Files[$i]}) CurrentValue=${CurrentValue#*\[} CurrentValue=${CurrentValue%\]*} [[ "$CurrentValue" == "${CorrectValues[$i]}" ]] && continue echo -e "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 echo -e "\nRechecking files after making updates.\n" i=0 ChangesNeeded=0 while [[ $i -lt ${#Files[*]} ]]; do CurrentValue=$(cat ${Files[$i]}) CurrentValue=${CurrentValue#*\[} CurrentValue=${CurrentValue%\]*} echo -n -e "File: : ${Files[$i]}\nCurrent Value: $CurrentValue\nCorrect Value: ${CorrectValues[$i]}" if [[ "$CurrentValue" == "${CorrectValues[$i]}" ]]; then echo -e " (OK)\n" else echo -e " (Still needs to be adjusted)\n" ChangesNeeded=$((ChangesNeeded+1)) fi i=$((i+1)) done if [[ $ChangesNeeded -eq 0 ]]; then echo -e "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 | |
---|---|---|---|---|---|
#4 | 25113 | Robert Cowham | Merge latest changes from dev | ||
#3 | 23205 | Robert Cowham | Merged all changes from dev to test | ||
#2 | 22142 | Robert Cowham | Merge in latest changes from Dev | ||
#1 | 20726 | Robert Cowham | Catch up from dev | ||
//guest/perforce_software/sdp/dev/Server/Unix/setup/os_tweaks.sh | |||||
#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). |