add vps-addswap

[webi-installers/.git] / vps-addswap / install.sh

diff --git a/vps-addswap/install.sh b/vps-addswap/install.sh
new file mode 100644 (file)
index 0000000..f1f559f
--- /dev/null
+++ b/vps-addswap/install.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+{
+    set -e
+    set -u
+
+    default_size=2G
+    my_size=${1:-$default_size}
+
+    # Allocate a swapfile
+    fallocate -l "$my_size" /var/swapfile
+
+    # Only allow root to read it
+    # (this is not sufficient security for sensitive data)
+    chmod 0600 /var/swapfile
+
+    # Activate the swap
+    mkswap /var/swapfile
+    swapon /var/swapfile
+
+    # Cause swap to be activated on boot
+    echo '/var/swapfile none swap sw 0 0' | tee -a /etc/fstab
+
+}