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kevinveenbirkenbachandClaude Opus 4.7
fe18ae43cf
Swap size was free(/)-25, which took ~99 GB on the 145 GB root fs. Remaining ~25 GB then ran out mid-deploy during Playwright image pulls (ENOSPC). Replace with a fixed 16 GB cap and use mountpoint to detect a real /mnt partition instead of [ -d /mnt ], which matched the empty placeholder dir on single-partition runners. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
72 lines
2.5 KiB
Bash
Executable File
72 lines
2.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Enlarge host swap on a GitHub-hosted runner. Replaces the runner's
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# default ~4 GB swap with a fixed-size swapfile so transient memory
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# spikes (e.g. peertube plugin install, issue #162) don't trip the host
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# OOM-killer, WITHOUT starving the rest of the job of disk space.
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#
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# Prefers /mnt when it is a separate partition (classic ubuntu-latest
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# layout with /dev/sdb mounted at /mnt). On current public runners
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# there is no separate /mnt partition — everything lives on /, so we
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# place the swapfile there. The swap size is a hard constant, never a
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# "free minus buffer" computation: a previous version consumed ~99 GB
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# on a 145 GB root, leaving so little headroom that later Docker layer
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# writes (Playwright test image pull) failed with ENOSPC. See #162.
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#
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# Usage: enlarge_swap.sh [size-gb]
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# Default: 16 GB (empirically sufficient for the peertube spike).
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#
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# Debug toggle: set SKIP_SWAP=1 to leave the runner's default swap
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# untouched (A/B probe for issues caused by this script itself).
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set -euo pipefail
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HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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DUMP="${HERE}/dump_runner_state.sh"
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if [ "${SKIP_SWAP:-0}" = "1" ]; then
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echo "SKIP_SWAP=1 — leaving default runner swap in place."
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"$DUMP" "skip-swap (SKIP_SWAP=1)"
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exit 0
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fi
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SWAP_GB="${1:-16}"
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MIN_FREE_GB=$((SWAP_GB + 4)) # need the target size plus a little slack
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"$DUMP" "before swap resize"
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sudo swapoff -a || true
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sudo rm -f /mnt/swapfile /swapfile
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# Only treat /mnt as a candidate if it is actually a separate mount.
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# On current ubuntu-latest public runners /mnt is an empty directory
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# on the root fs, which would double-count free space.
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if mountpoint -q /mnt 2>/dev/null; then
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mnt_free=$(df --output=avail -B1G /mnt | tail -n1 | tr -d ' ')
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else
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mnt_free=0
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fi
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root_free=$(df --output=avail -B1G / | tail -n1 | tr -d ' ')
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echo "Target swap: ${SWAP_GB}G. Free: / ${root_free}G, /mnt ${mnt_free}G (separate mount: $(mountpoint -q /mnt 2>/dev/null && echo yes || echo no))"
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if [ "$mnt_free" -ge "$MIN_FREE_GB" ]; then
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target=/mnt/swapfile
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chosen="/mnt (separate partition)"
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elif [ "$root_free" -ge "$MIN_FREE_GB" ]; then
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target=/swapfile
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chosen="/ (no separate /mnt)"
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else
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echo "Neither / nor /mnt has ${MIN_FREE_GB} GB free for a ${SWAP_GB} GB swapfile" >&2
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df -h / /mnt >&2
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exit 1
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fi
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echo "Chose ${chosen}: creating ${SWAP_GB}G swapfile at ${target}"
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sudo fallocate -l "${SWAP_GB}G" "$target"
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sudo chmod 600 "$target"
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sudo mkswap "$target"
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sudo swapon "$target"
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"$DUMP" "after swap resize → ${SWAP_GB}G at ${target}"
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