187 lines
5.2 KiB
Bash
187 lines
5.2 KiB
Bash
#!/bin/bash
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## addswap.sh
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## version 1.01
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## Quickly add and activate a SWAP file.
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## Author: Ze'ev Schurmann
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## License: GPL3.0 or later
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## Git Repo: https://git.zaks.web.za/thisiszeev/linux-server-tools
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## Usage:
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##
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## (as root)
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## ./addswap.sh {size-in-gigaytes}
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##
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## (with sudo)
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## sudo ./addswap.sh {size-in-gigaytes}
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##
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## {size-in-gigabytes} is optional. If you leave it out then the size will default
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## to 4GB.
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##
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## The script will quickly create a SWAP file, activate it and add it to /etc/fstab
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##
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## It is important that you have addswap.sh and remswap.sh in the same folder and
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## set the permissions to 700 and the owner and group to root. Do not try and run
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## either script with out root or sudo privelages.
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##
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## A log file can be found at /var/log/swapmanagement.log
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## Why did I make these two scripts?
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##
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## I use Debian as my daily driver (I've been using Linux in some for or the other
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## as my daily driver since 2006). I also us Debian for all my servers. I also
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## running a webhosting business (https://www.zaks.web.za) and in my 20+ years in
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## the game, I have learned that... 1. VPS's do not come with SWAP, but sometimes
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## you need a bit of SWAP to handle heavy load. 2. SWAP files can be added and
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## removed on the fly (no reboot required), however a SWAP partition, not so simple.
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##
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## On my daily driver machine, I also create a lot of digital artwork. I recently
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## found myself rendering a finished artfile that was 9.5GB (24000px by 13700px)
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## in Gimp, and half way through I started running out of RAM and SWAP. So I
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## quickly created the needed SWAP file, and Gimp was able to finish the render
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## without crashing.
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## Plans for the future:
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##
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## I am planning to make a configurable service file that can be run in the
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## background to automatically create more SWAP files when your server/computer is
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## under load, and remove excess SWAP files when the server/computer is no longer
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## under load.
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## Do you have a script idea?
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## If you have an idea for a useful server script for selfhost/homelab environments,
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## please start a chat with me on Reddit /u/thisiszeev and share your idea. I might
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## just make it a reality, and give you credit in the relevant README.md file.
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## Donations
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##
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## Please consider making me small donation. Even though my scripts are open source
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## and free to use, I still need to eat. And the occasional bottle of wine also goes
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## down well.
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##
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## $5 buys me a cup of coffee
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## $10 buys me a nice burger
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## $20 buys me a bottle of wine
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## Anything above that will be awesome as well.
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##
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## You can send me a donation via Paypal https://www.paypal.com/paypalme/thisiszeev
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##
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## Drop me a message on Reddit if you do make a donation. u/thisiszeev
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##
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## Support is only offered freely to those who donate $20 or more.
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##
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## Your donation contributes to further development.
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##
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## If you need a custom script, contact me on Reddit for pricing.
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function echolog {
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echo "$1"
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echo "$(date) > addswap > $1" >> /var/log/swapmanagement.log
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if [[ $(wc -l < /var/log/swapmanagement.log) -gt 300 ]]; then
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cat /var/log/swapmanagement.log | tail -n 250 > /var/log/swapmanagement.temp && mv /var/log/swapmanagement.temp /var/log/swapmanagement.log
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fi
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}
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if [[ -z $1 ]] || [[ $1 = "" ]] || [[ ! $1 =~ ^[0-9]+$ ]] || [[ $1 -le 0 ]]; then
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swapsize=4
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echolog "Swap size not defined. Defaulting to 4GB."
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else
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swapsize=$1
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echolog "Swap size manually defined as ${swapsize}GB."
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fi
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partitioncount=$(swapon --show | grep "partition" | wc -l)
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filecount=$(swapon --show | grep "file" | wc -l)
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totalcount=$((partitioncount+filecount))
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echolog "You currently have $partitioncount active swap partitions and $filecount active swap files."
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if [[ $totalcount -gt 23 ]]; then
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echolog "You already have 24 or more active swap partitions and files."
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exit 1
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fi
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swaplimit=$((24-$partitioncount))
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array=($(df | grep "/$"))
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freespace=$((${array[3]}/1048576))
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if [[ $freespace -gt $swapsize ]]; then
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checking=true
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n=1
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while [[ $checking == true ]]; do
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if [[ $n -gt $swaplimit ]]; then
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echolog "You already have 24 or more active swap partitions and files."
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exit 1
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fi
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if [[ $n -lt 10 ]]; then
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ext="00$n"
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elif [[ $n -lt 25 ]] && [[ $n -gt 9 ]]; then
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ext="0$n"
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else
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echolog "You already have 24 or more active swap partitions and files."
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exit 1
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fi
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if [[ -f /swapfile.$ext ]]; then
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if swapon --show=NAME | grep -qF "/swapfile.$ext"; then
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echolog "/swapfile.$ext exists...[Active]"
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else
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echolog "/swapfile.$ext exists...[Inactive] > Removing"
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bash remswap.sh "/swapfile.$ext"
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filecount=$(swapon --show | grep "file" | wc -l)
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fi
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((n++))
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else
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echolog "Creating /swapfile.$ext..."
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fallocate -l ${swapsize}G /swapfile.$ext
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chmod 600 /swapfile.$ext
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mkswap /swapfile.$ext
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swapon /swapfile.$ext
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echo "/swapfile.$ext none swap sw 0 0" >> /etc/fstab
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checking=false
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filecount=$(swapon --show | grep "file" | wc -l)
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echolog "You now have $partitioncount active swap partitions and $filecount active swap files."
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exit 0
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fi
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done
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else
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echolog "Not enough harddrive space to make a ${swapsize}GB swap file."
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exit 2
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fi
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