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Moving NOP Linux install directives to documentation (#96)
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‎content/en/docs/cluster/nop-linux.md

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@@ -10,4 +10,131 @@ When benchmarking software it is important to have reproducible results between
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We recommend tuning the Linux OS on all linux measurement machines that you have in your cluster to get the highest reproducability out of your measurement runs.
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For a detailed description on how to produce your own NOP Linux instance visit [our blog article on NOP Linux](https://www.green-coding.io/blog/nop-linux/).
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The following script configures an Ubuntu 22.04+ system to have no active timers running, remove all unneeded services and disable also
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NTP.
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The goal is to keep the system still very close to a production / user setup, but remove invariances from the system without
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decreasing idle power draw and skewing results.
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Please further note that you must execute certain service still periodically. The [client.py](https://github.com/green-coding-solutions/green-metrics-tool/blob/main/cron/client.py) cluster service will periodically run [a cleanup script](https://github.com/green-coding-solutions/green-metrics-tool/blob/main/tools/cluster/cleanup_original.py)
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```bash
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#!/bin/bash
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set -euox pipefail
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# this is a patch. Firefox seems to have a trick to remove read-only filesystem. We need to unmount that first
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sudo umount /var/snap/firefox/common/host-hunspell || true
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# remov all snaps first as they mount read only filesystem that only snap itself can find and unmount
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for i in {1..3}; do # we do this three times as packages depends on one another
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for snap_pkg in $(snap list | awk 'NR>1 {print $1}'); do sudo snap remove --purge "$snap_pkg"; done
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done
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# Remove all the packages we don't need
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sudo apt purge -y --purge snapd cloud-guest-utils cloud-init apport apport-symptoms cryptsetup cryptsetup-bin cryptsetup-initramfs curl gdisk lxd-installer mdadm open-iscsi snapd squashfs-tools ssh-import-id wget xauth unattended-upgrades update-notifier-common python3-update-manager unattended-upgrades needrestart command-not-found cron lxd-agent-loader modemmanager motd-news-config pastebinit packagekit
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sudo systemctl daemon-reload
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sudo apt autoremove -y --purge
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# Get newest versions of everything
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sudo apt update
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sudo apt install psmisc -y
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# on some versions killall might be missing. Please insta
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sudo killall unattended-upgrade-shutdown
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sudo apt upgrade -y
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# These are packages that are installed through the update
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sudo apt remove -y --purge networkd-dispatcher multipath-tools
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sudo apt autoremove -y --purge
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# These are user running services
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systemctl --user disable --now snap.firmware-updater.firmware-notifier.timer
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systemctl --user disable --now launchpadlib-cache-clean.timer
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systemctl --user disable --now snap.snapd-desktop-integration.snapd-desktop-integration.service
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# Disable services that might do things
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sudo systemctl disable --now apt-daily-upgrade.timer
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sudo systemctl disable --now apt-daily.timer
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sudo systemctl disable --now dpkg-db-backup.timer
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sudo systemctl disable --now e2scrub_all.timer
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sudo systemctl disable --now fstrim.timer
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sudo systemctl disable --now motd-news.timer
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sudo systemctl disable --now e2scrub_reap.service
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sudo systemctl disable --now tinyproxy.service
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sudo systemctl disable --now anacron.timer
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# these following timers might be missing on newer ubuntus
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sudo systemctl disable --now systemd-tmpfiles-clean.timer
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sudo systemctl disable --now fwupd-refresh.timer
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sudo systemctl disable --now logrotate.timer
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sudo systemctl disable --now ua-timer.timer
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sudo systemctl disable --now man-db.timer
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sudo systemctl disable --now sysstat-collect.timer
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sudo systemctl disable --now sysstat-summary.timer
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sudo systemctl disable --now systemd-journal-flush.service
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sudo systemctl disable --now systemd-timesyncd.service
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sudo systemctl disable --now systemd-fsckd.socket
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sudo systemctl disable --now systemd-initctl.socket
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sudo systemctl disable --now cryptsetup.target
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sudo systemctl disable --now power-profiles-daemon.service
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sudo systemctl disable --now thermald.service
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sudo systemctl disable --now anacron.service
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# Packages to install for editing and later bluetooth. some of us prefer nano, some vim :)
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sudo apt install -y vim nano bluez
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# Setup networking
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NET_NAME=$(sudo networkctl list "en*" --no-legend | cut -f 4 -d " ")
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cat <<EOT | sudo tee /etc/systemd/network/en.network
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[Match]
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Name=$NET_NAME
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[Network]
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DHCP=ipv4
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EOT
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# Disable NTP
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sudo timedatectl set-ntp false
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# Disable the kernel watchdogs
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echo 0 | sudo tee /proc/sys/kernel/soft_watchdog
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echo 0 | sudo tee /proc/sys/kernel/nmi_watchdog
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echo 0 | sudo tee /proc/sys/kernel/watchdog
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echo 0 | sudo tee /proc/sys/kernel/watchdog_thresh
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# Removes the large header when logging in
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sudo rm /etc/update-motd.d/*
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# Remove all cron files. Cron shouldn't be running anyway but just to be safe
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rm -R /etc/cron*
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sudo apt autoremove -y --purge
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# Desktop systems have NetworkManager. Here we want to disable the periodic check to Host: connectivity-check.ubuntu.com.
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if [ -f "/etc/NetworkManager/NetworkManager.conf" ]; then
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echo "[connectivity]" >> /etc/NetworkManager/NetworkManager.conf
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echo "uri=" >> /etc/NetworkManager/NetworkManager.conf
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echo "interval=0" >> /etc/NetworkManager/NetworkManager.conf
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else
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echo "NetworkManager configuration file seems not to exist. Probably non desktop system"
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fi
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# List all timers and services to validate we have nothing left
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sudo systemctl list timers
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systemctl --user list-timers
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echo "All done. Please reboot system!"
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```

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