From aced495844ee447ff03d7e422c6d4628271022a7 Mon Sep 17 00:00:00 2001 From: johannst Date: Sun, 11 Sep 2022 17:00:33 +0000 Subject: deploy: de78630d8ac5a474768de7f6aaa1843b6195e04b --- linux/swap.html | 221 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 221 insertions(+) create mode 100644 linux/swap.html (limited to 'linux/swap.html') diff --git a/linux/swap.html b/linux/swap.html new file mode 100644 index 0000000..85011fa --- /dev/null +++ b/linux/swap.html @@ -0,0 +1,221 @@ + + + + + + swap - Notes + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + +
+
+

swap

+

List active swap areas

+
# procfs
+cat /proc/swaps
+
+# cli tool
+swapon --show
+
+

Manual swapfile setup

+
# 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.

+
# 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
+
+
+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + -- cgit v1.2.3