Docker 古いイメージタグ削除スクリプト生成ツール

Pruning Policy

#!/usr/bin/env bash
# Docker Tag Retention & Cleanup Script
# Generated by MiniToolDesk (100% Client-Side)

set -euo pipefail

KEEP_COUNT=3
DRY_RUN=true

echo "Scanning local Docker images..."
docker images --format '{{.Repository}}:{{.Tag}} {{.CreatedAt}}' | sort -k2 -r | awk -v keep="$KEEP_COUNT" '
  {
    repo_tag = $1
    if (repo_tag ~ /<none>/) next;
    split(repo_tag, arr, ":")
    repo = arr[1]
    count[repo]++
    if (count[repo] > keep) {
      print repo_tag
    }
  }
' | while read -r image; do
  if [ "$DRY_RUN" = "true" ]; then
    echo "[DRY-RUN] Would remove old image tag: $image"
  else
    echo "Removing image tag: $image"
    docker rmi "$image" || true
  fi
done

echo "Cleanup completed successfully!"