152 lines
4.4 KiB
Bash
152 lines
4.4 KiB
Bash
#!/bin/bash
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## remswap.sh
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## version 1.0
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## Quickly deactivate and remove 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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## ./remswap.sh {/swapfile.0xx}
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##
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## (with sudo)
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## sudo ./remswap.sh {/swapfile.0xx}
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##
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## {/swapfile.0xx} is optional. The 0xx extension is a range of numbers from 001 to
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## 024. If you leave it out then the last file in the sequence will be removed.
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##
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## The script will quickly deactivate a SWAP file, removed it and remove it from
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## /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) > remswap > $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 ]] || [[ $1 == "" ]]; then
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swapfile=$(ls -1 /swapfile.* 2>/dev/null | tail -1)
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if [[ -z "$swapfile" ]]; then
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echolog "No swap files found to remove."
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exit 1
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fi
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elif [[ $1 =~ ^/swapfile\.0(0[0-9]|1[0-9]|2[0-4])$ ]] && [[ -f $1 ]]; then
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swapfile="$1"
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else
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echolog "Invalid swap file name given or swap file does not exist."
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exit 2
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fi
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if swapon --show=NAME | grep -qF "$swapfile"; then
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echolog "Turning off $swapfile..."
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swapoff "$swapfile"
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else
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echolog "$swapfile is not active."
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fi
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if grep -Fq "$swapfile" /etc/fstab; then
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echolog "Removing $swapfile entry from /etc/fstab..."
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sed -i "\|$swapfile|d" /etc/fstab
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else
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echolog "$swapfile entry not found in /etc/fstab."
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fi
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echolog "Deleting $swapfile..."
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rm -f "$swapfile"
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if [[ $? == 0 ]]; then
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echolog "$swapfile successfully removed."
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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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echolog "You now have $partitioncount active swap partitions and $filecount active swap files."
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exit 0
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else
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echolog "$swapfile failed to be removed."
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exit 3
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fi
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