wan
84d6f9724c
- runner: export sbin-inclusive PATH (util-linux tools live in /usr/sbin) - 001: read /proc/swaps instead of swapon(8) - 005: resolve /dev/disk/by-uuid symlink instead of findfs(8); report ? (exit 2) when the UUID cannot be resolved
44 lines
1.6 KiB
Bash
44 lines
1.6 KiB
Bash
#!/usr/bin/env bash
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# 001-create-swap - Create 2GB swap + fstab entry + vm.swappiness=10
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# up: enable swap (skipped if swap already active)
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# down: disable swap and remove file/fstab/sysctl entries
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set -euo pipefail
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case "${1:-}" in
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up)
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if swapon --show --noheadings | grep -q .; then
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echo " swap already active - skipping"
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exit 0
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fi
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if [[ ! -f /swapfile ]]; then
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fallocate -l 2G /swapfile || {
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dd if=/dev/zero of=/swapfile bs=1M count=2048 status=none
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}
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chmod 600 /swapfile
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mkswap /swapfile >/dev/null
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fi
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swapon /swapfile
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grep -q '^/swapfile' /etc/fstab || echo '/swapfile none swap sw 0 0' >> /etc/fstab
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if ! grep -rqs 'vm.swappiness' /etc/sysctl.d/ /etc/sysctl.conf; then
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echo 'vm.swappiness=10' > /etc/sysctl.d/99-swap.conf
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sysctl -p /etc/sysctl.d/99-swap.conf >/dev/null
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fi
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echo " swap 2GB enabled + fstab entry + vm.swappiness=10"
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;;
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status)
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grep -q '^/swapfile ' /proc/swaps || { echo "DRIFT /swapfile not active"; exit 1; }
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grep -q '^/swapfile ' /etc/fstab || { echo "DRIFT fstab entry missing"; exit 1; }
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swp=$(cat /proc/sys/vm/swappiness 2>/dev/null || echo '?')
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[[ $swp == 10 ]] || { echo "DRIFT vm.swappiness=$swp (want 10)"; exit 1; }
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echo "OK swap active + fstab entry, swappiness=10"
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;;
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down)
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swapoff /swapfile
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rm -f /swapfile
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sed -i '\|^/swapfile|d' /etc/fstab
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grep -q '^vm.swappiness=10$' /etc/sysctl.d/99-swap.conf 2>/dev/null \
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&& rm -f /etc/sysctl.d/99-swap.conf || true
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echo " swap removed"
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;;
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esac
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