When getting an invalid argument error when doing swapon /swapfile (for instance) it might be due to the underlying filesystem being btrfs. In this case you need to do the following steps:
# truncate -s 0 swapfile
# chattr +C swapfile
# fallocate -l 2G swapfile
# chmod 0600 swapfile
# mkswap swapfile
# swapon swapfileSince version 6.1 of the btrfs tooling it’s possible to create the swapfile in a single command (except the activation):
# btrfs filesystem mkswapfile --size 2G swapfile
# swapon swapfileAll commands need root permissions (so either with root account or via sudo)
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Generating swap file on btrfs filesystem
