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|
# swap
## List active swap areas
```sh
# procfs
cat /proc/swaps
# cli tool
swapon --show
```
## Manual swapfile setup
```sh
# One time:
# Create and initialize swapfile.
# mkswap will initialize swap area over full filesize by default.
sudo dd if=/dev/zero of=/swapfile bs=1G count=1
mkswap /swapfile
# Enable swap file (until next reboot).
swapon /swapfile
# Persistent setup of swap file.
echo "/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab
# Disable swap file (until next reboot).
swapoff /swapfile
```
> Recommended file permissions `0600` and file owner `uid=0 (root)`.
## Using `dphys-swapfile` service.
Dynamically computes size of swap file based on installed RAM.
```sh
# Setup and enable swap based on /etc/dphys-swapfile.
dphys-swapfile setup
dphys-swapfile swapon
# Disable swap on configured file.
dphys-swapfile swapoff
```
> Usually comes with a script to be automatically run at system startup and shutdown.
> For example as `systemd` service:
> ```
> systemctl status dphys-swapfile
> ```
|
