{"id":18665,"date":"2026-04-03T08:34:13","date_gmt":"2026-04-03T06:34:13","guid":{"rendered":"https:\/\/webhosting.de\/dns-load-balancing-vs-application-load-balancer-infrastruktur\/"},"modified":"2026-04-03T08:34:13","modified_gmt":"2026-04-03T06:34:13","slug":"dns%e3%83%ad%e3%83%bc%e3%83%89%e3%83%90%e3%83%a9%e3%83%b3%e3%82%b7%e3%83%b3%e3%82%b0-vs-%e3%82%a2%e3%83%97%e3%83%aa%e3%82%b1%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%83%90","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/dns-load-balancing-vs-application-load-balancer-infrastruktur\/","title":{"rendered":"DNS\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u3068\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc\u306e\u9055\u3044\u3001\u5229\u70b9\u3001\u5fdc\u7528\u4f8b"},"content":{"rendered":"<p>dns\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u306f\u540d\u524d\u89e3\u6c7a\u3067\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u5206\u6563\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u3092\u5229\u7528\u53ef\u80fd\u306a\u5b9b\u5148\u306b\u7d20\u65e9\u304f\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3059\u308b\u3002\u4e00\u65b9\u3001\u30ec\u30a4\u30e4\u30fc7\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc\u306f\u3001\u30d1\u30b9\u3001\u30db\u30b9\u30c8\u3001\u30af\u30c3\u30ad\u30fc\u306e\u3088\u3046\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u57fa\u3065\u3044\u3066\u6c7a\u5b9a\u3059\u308b\u3002\u4e21\u65b9\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u9055\u3044\u3001\u5229\u70b9\u3001\u5178\u578b\u7684\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8aac\u660e\u3057\u3001\u3069\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u5229\u7528\u3055\u308c\u308b\u304b\u3092\u793a\u3057\u307e\u3059\u3002 <strong>\u30b3\u30f3\u30d3\u30cd\u30fc\u30b7\u30e7\u30f3<\/strong> \u3082\u3063\u3068\u3082\u3060\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n<p>\u4ee5\u4e0b\u306e\u30ea\u30b9\u30c8\u306f\u3001\u5efa\u7bc9\u3068\u30b3\u30b9\u30c8\u3092\u6c7a\u5b9a\u3059\u308b\u305f\u3081\u306e\u6700\u3082\u91cd\u8981\u306a\u65b9\u5411\u6027\u3092\u793a\u3057\u3066\u304f\u308c\u308b\u3002 <strong>\u30af\u30ea\u30a2<\/strong> \u30c7\u30de\u30b1\u30fc\u30b7\u30e7\u30f3\u3002.<\/p>\n<ul>\n  <li><strong>\u30ec\u30d9\u30eb<\/strong>DNS\u306f\u540d\u524d\u89e3\u6c7a\u3001ALB\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ec\u30d9\u30eb\u3067\u6a5f\u80fd\u3059\u308b\u3002.<\/li>\n  <li><strong>\u6c7a\u65ad<\/strong>DNS\u306fIP\u3092\u9078\u629e\u3057\u3001ALB\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u5fdc\u3058\u3066\u30eb\u30fc\u30c8\u3092\u9078\u629e\u3059\u308b\u3002.<\/li>\n  <li><strong>\u30b9\u30d4\u30fc\u30c9<\/strong>DNS\u306f\u7d20\u65e9\u304f\u53cd\u5fdc\u3057\u3001ALB\u306f\u7d30\u304b\u3044\u7c92\u5ea6\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u3002.<\/li>\n  <li><strong>\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0<\/strong>DNS\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u5206\u6563\u3057\u3001ALB\u306f\u30ed\u30fc\u30ab\u30eb\u306b\u6700\u9069\u5316\u3059\u308b\u3002.<\/li>\n  <li><strong>\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9<\/strong>\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u308a\u3001\u30b3\u30b9\u30c8\u3092\u524a\u6e1b\u3057\u3001\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/li>\n<\/ul>\n\n<h2>\u306a\u305c\u6226\u7565\u306e\u9078\u629e\u304c\u91cd\u8981\u306a\u306e\u304b<\/h2>\n\n<p>\u79c1\u306f\u65e5\u3005\u3001\u9069\u5207\u306a\u8ca0\u8377\u5206\u6563\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u56de\u5fa9\u529b\u3001\u5fdc\u7b54\u6642\u9593\u3001\u904b\u7528\u30b3\u30b9\u30c8\u306b\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b\u3092\u76ee\u306e\u5f53\u305f\u308a\u306b\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30d5\u30a3\u30c3\u30c8<\/strong> \u3092\u72ec\u81ea\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306b\u79fb\u884c\u3057\u307e\u3059\u3002DNS\u30d9\u30fc\u30b9\u306e\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u65e9\u671f\u304b\u3064\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u30b7\u30d5\u30c8\u3055\u305b\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u3068\u30ea\u30fc\u30c1\u306b\u597d\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc\uff08ALB\uff09\u306f\u3001DNS\u89e3\u6c7a\u5f8c\u306b\u306e\u307f\u6c7a\u5b9a\u3092\u4e0b\u3057\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u99c6\u52d5\u578b\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u512a\u5148\u3059\u308b\u3002\u3069\u3061\u3089\u3082\u7570\u306a\u308b\u30bf\u30b9\u30af\u3092\u89e3\u6c7a\u3057\u307e\u3059\uff1aDNS\u306f\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u3068\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u3092\u62c5\u5f53\u3057\u3001ALB\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u62c5\u5f53\u3059\u308b\u3002\u3053\u306e2\u3064\u3092\u3046\u307e\u304f\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3092\u6e1b\u3089\u3057\u3001\u30ad\u30e3\u30d1\u30b7\u30c6\u30a3\u3092\u6709\u52b9\u6d3b\u7528\u3057\u3001\u9ad8\u4fa1\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30ea\u30b9\u30af\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <strong>\u5931\u6557\u4f8b<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/serverfarm-loadbalancer-4820.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>DNS\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u306e\u7c21\u5358\u306a\u8aac\u660e<\/h2>\n\n<p>DNS\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u3067\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u3092\u8907\u6570\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u30ea\u30f3\u30af\u3057\u3001\u30ea\u30be\u30eb\u30d0\u306b\u5468\u671f\u7684\u307e\u305f\u306f\u91cd\u307f\u4ed8\u3051\u3067\u5fdc\u7b54\u3055\u305b\u307e\u3059\u3002 <strong>\u7a7a\u5ba4\u72b6\u6cc1<\/strong> \u5897\u52a0\u3059\u308b\u3002\u30ec\u30b9\u30dd\u30f3\u30b9\u306b\u3088\u3063\u3066\u30e6\u30fc\u30b6\u30fc\u3092\u6700\u3082\u8fd1\u3044\u5834\u6240\u306b\u8a98\u5c0e\u3067\u304d\u308b\u306e\u3067\u3001\u3053\u308c\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30e6\u30fc\u30b6\u30fc\u306b\u9069\u3057\u3066\u3044\u308b\u3002\u307e\u305f\u3001\u30d8\u30eb\u30b9\u30c1\u30a7\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u304c\u307e\u3060\u6a5f\u80fd\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30c7\u30b0\u30ec\u30fc\u30c9\u3057\u305f\u30c7\u30b9\u30c6\u30a3\u30cd\u30fc\u30b7\u30e7\u30f3\u3092\u524a\u9664\u3057\u307e\u3059\u3002TTL\u304c\u9577\u3044\u3068\u5207\u308a\u66ff\u3048\u304c\u9045\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u79c1\u306f\u5e38\u306bTTL\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u679c\u3092\u8003\u616e\u3057\u3066\u3044\u307e\u3059\u3002\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3068\u5b9f\u8cea\u7684\u306a\u5236\u9650\u306e\u8a73\u7d30\u3092\u7406\u89e3\u3059\u308b\u306b\u306f <a href=\"https:\/\/webhosting.de\/ja\/dns%e3%83%a9%e3%82%a6%e3%83%b3%e3%83%89%e3%83%ad%e3%83%93%e3%83%b3%e8%b2%a0%e8%8d%b7%e5%88%86%e6%95%a3%e5%88%b6%e9%99%90-clustertech\/\">\u30e9\u30a6\u30f3\u30c9\u30ed\u30d3\u30f3\u5236\u9650<\/a> \u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u6b7b\u89d2\u3092\u56de\u907f\u3057\u3001\u751f\u7523\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30c7\u30b6\u30a4\u30f3<\/strong>.<\/p>\n\n<h2>\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3068\u5236\u5fa1<\/h2>\n\n<p>\u79c1\u306f\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u304c\u5747\u8cea\u306a\u5834\u5408\u306f\u5358\u7d14\u306a\u30e9\u30a6\u30f3\u30c9\u30ed\u30d3\u30f3\u65b9\u5f0f\u3092\u4f7f\u7528\u3057\u3001\u80fd\u529b\u304c\u5927\u304d\u304f\u7570\u306a\u308b\u5834\u5408\u306f\u3059\u3050\u306b\u91cd\u307f\u3092\u4f7f\u7528\u3057\u3066\u5f37\u529b\u306a\u30b5\u30fc\u30d0\u30fc\u306e\u30d2\u30c3\u30c8\u7387\u3092\u9ad8\u3081\u307e\u3059\u3002 <strong>\u8ca0\u8377<\/strong> \u3092\u50be\u3051\u308b\u3002\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u30fb\u30ed\u30fc\u30c9\u30fb\u30a4\u30e1\u30fc\u30b8\u306b\u306f\u30b8\u30aa\u30fb\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u4f7f\u3044\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3078\u306e\u30eb\u30fc\u30c8\u3092\u77ed\u7e2e\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306aAPI\u306f\u3001DNS\u30b5\u30fc\u30d3\u30b9\u304c\u6e2c\u5b9a\u5024\u3092\u7406\u89e3\u3057\u3001\u305d\u308c\u3092\u5206\u6563\u5316\u3055\u308c\u305f\u65b9\u6cd5\u3067\u8a18\u9332\u3059\u308b\u306e\u3067\u3042\u308c\u3070\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc\u6307\u5411\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u304b\u3089\u6069\u6075\u3092\u53d7\u3051\u308b\u3002DNS\u306b\u304a\u3051\u308b\u6700\u5c0f\u63a5\u7d9a\u306e\u3088\u3046\u306a\u30a2\u30a4\u30c7\u30a2\u306f\u3001\u30ea\u30be\u30eb\u30d0\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u73fe\u5b9f\u3068\u8a08\u753b\u3092\u5f15\u304d\u96e2\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002\u9069\u5207\u306a\u6280\u8853\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u624b\u9593\u3092\u7701\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e8%b2%a0%e8%8d%b7%e5%88%86%e6%95%a3%e3%82%b9%e3%83%88%e3%83%a9%e3%83%86%e3%82%b8%e3%83%bc-%e3%83%a9%e3%82%a6%e3%83%b3%e3%83%89%e3%83%ad%e3%83%93%e3%83%b3-%e6%9c%80%e5%b0%8f%e6%8e%a5%e7%b6%9a%e6%95%b0\/\">\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u6226\u7565<\/a> \u6c7a\u65ad\u3092\u92ed\u304f\u3057 <strong>\u8a2d\u5b9a\u30df\u30b9<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/dns_vs_app_lb_mtg_8372.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>DNS\u306e\u5229\u70b9\u3068\u5178\u578b\u7684\u306a\u5fdc\u7528\u30b7\u30ca\u30ea\u30aa<\/h2>\n\n<p>DNS\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u3092\u5229\u7528\u3059\u308b\u306e\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u5206\u6563\u3057\u3001\u30b3\u30b9\u30c8\u3092\u524a\u6e1b\u3057\u3001\u5c02\u7528\u306e\u30df\u30c9\u30eb\u30dc\u30c3\u30af\u30b9\u3084\u8ffd\u52a0\u8a2d\u5099\u306a\u3057\u3067\u8a2d\u5b9a\u6642\u9593\u3092\u77ed\u304f\u3057\u305f\u3044\u5834\u5408\u3067\u3059\u3002 <strong>\u30db\u30c3\u30d7<\/strong>. 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<strong>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/strong>.<\/p>\n\n<h2>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30fb\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc\u306e\u5b9f\u969b<\/h2>\n\n<p>ALB\u306fHTTP\/S\u30d8\u30c3\u30c0\u30fc\u3001\u30d1\u30b9\u3001\u30db\u30b9\u30c8\u3001\u30af\u30c3\u30ad\u30fc\u3092\u691c\u67fb\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8fd1\u304f\u3067\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u6c7a\u5b9a\u3092\u884c\u3046\u3002 <strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/strong> 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<a href=\"https:\/\/webhosting.de\/ja\/%e3%83%aa%e3%83%90%e3%83%bc%e3%82%b9%e3%83%97%e3%83%ad%e3%82%ad%e3%82%b7%e3%83%bb%e3%82%a2%e3%83%bc%e3%82%ad%e3%83%86%e3%82%af%e3%83%81%e3%83%a3-%e5%88%a9%e7%82%b9-%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc\/\">\u30ea\u30d0\u30fc\u30b9\u30fb\u30d7\u30ed\u30ad\u30b7\u30fb\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3<\/a> \u307e\u305f\u3001\u30d1\u30b9\u3001\u30db\u30b9\u30c8\u3001\u30dd\u30ea\u30b7\u30fc\u306e\u4e00\u8cab\u6027\u3092\u4fdd\u3064\u3053\u3068\u3067\u3001\u65e9\u3044\u6bb5\u968e\u3067\u30a8\u30e9\u30fc\u30d1\u30b9\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30ad\u30e3\u30c3\u30c1<\/strong>.<\/p>\n\n<h2>\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30a4\u30f3\u30c6\u30ea\u30b8\u30a7\u30f3\u30b9\uff1a\u30d1\u30b9\u3001\u30db\u30b9\u30c8\u3001\u30bb\u30c3\u30b7\u30e7\u30f3<\/h2>\n\n<p>\u79c1\u306f\u3001\u30db\u30b9\u30c8\u540d\uff08api.example\u3001shop.example\uff09\u3084\u30c0\u30a4\u30ec\u30af\u30c8\u30fb\u30d1\u30b9\uff08\u4f8b\uff1a\/api\/v1\/\uff09\u3092\u4ecb\u3057\u3066\u3001\u7570\u306a\u308b\u30bf\u30fc\u30b2\u30c3\u30c8\u30fb\u30b0\u30eb\u30fc\u30d7\u306b\u30b5\u30fc\u30d3\u30b9\u3092\u5206\u96e2\u3057\u3066\u3044\u308b\u3002 <strong>\u30d8\u30c3\u30b8<\/strong> 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<strong>\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8<\/strong>.<\/p>\n\n<h2>\u30d8\u30eb\u30b9\u30c1\u30a7\u30c3\u30af\u3068\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc<\/h2>\n\n<p>\u79c1\u306f\u7d14\u7c8b\u306bICMP\u3084TCP\u306e\u5230\u9054\u53ef\u80fd\u6027\u306b\u983c\u308b\u306e\u3067\u306f\u306a\u304f\u3001URL\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u3001\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u7279\u5225\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u3067\u3001\u52a3\u5316\u3057\u305f\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u304c\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u98df\u3044\u5c3d\u304f\u3055\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u30a8\u30e9\u30fc<\/strong> 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<strong>\u30a2\u30af\u30c6\u30a3\u30d6-\u30d1\u30c3\u30b7\u30d6<\/strong>-\u30ea\u30fc\u30b8\u30e7\u30f3\u3060\u3051\u304c\u98db\u3073\u8fbc\u3093\u3067\u304f\u308b\u3002Active-Active\u306f\u3001\u30ad\u30e3\u30d1\u30b7\u30c6\u30a3\u3092\u3088\u308a\u52b9\u7387\u7684\u306b\u6d3b\u7528\u3057\u3001\u30db\u30c3\u30c8\u30b9\u30dd\u30c3\u30c8\u3092\u6e1b\u3089\u3057\u3001\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u3092\u30ed\u30fc\u30ea\u30f3\u30b0\u30d9\u30fc\u30b9\u3067\u5206\u6563\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u305d\u306e\u305f\u3081\u306b\u306f\u3001\u53b3\u5bc6\u306a\u4e00\u8cab\u6027\u30eb\u30fc\u30eb\uff08\u30bb\u30c3\u30b7\u30e7\u30f3\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u66f8\u304d\u8fbc\u307f\u30a2\u30af\u30bb\u30b9\uff09\u3068\u7af6\u5408\u306e\u306a\u3044\u30c7\u30fc\u30bf\u30ec\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u5fc5\u8981\u3067\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u6b21\u306e\u3088\u3046\u306a\u30ea\u30b9\u30af\u304c\u3042\u308b\u3002 <strong>\u30b9\u30d7\u30ea\u30c3\u30c8\u30fb\u30d6\u30ec\u30a4\u30f3<\/strong>. .\u30a2\u30af\u30c6\u30a3\u30d6-\u30d1\u30c3\u30b7\u30d6\u306f\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u3060\u304c\u3001DNS\u304c\u5c11\u6570\u306e\u5927\u304d\u306a\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u5207\u308a\u66ff\u308f\u3063\u305f\u5834\u5408\u3001\u30b3\u30fc\u30eb\u30c9\u30b9\u30bf\u30fc\u30c8\u3001\u30b3\u30fc\u30eb\u30c9\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc\u6642\u306e\u8ca0\u8377\u30d4\u30fc\u30af\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002.<\/p>\n<p>\u30a2\u30af\u30c6\u30a3\u30d6-\u30a2\u30af\u30c6\u30a3\u30d6\u306f\u5bfe\u79f0\u7684\u306a\u91cd\u307f\u3092\u53d7\u3051\u3001\u30a2\u30af\u30c6\u30a3\u30d6-\u30d1\u30c3\u30b7\u30d6\u306f\u5c0f\u3055\u306a\u30b7\u30a7\u30a2\uff08\u4f8b\u3048\u30701-5 %\uff09\u3092\u53d7\u3051\u308b\u3002 <strong>\u4fdd\u6e29<\/strong>. .\u969c\u5bb3\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u306b\u5897\u3084\u3059\u3002ALB\u30ec\u30d9\u30eb\u3067\u306f <strong>\u63a5\u7d9a\u306e\u6392\u6c34<\/strong>, \u30d7\u30fc\u30eb\u304b\u3089\u30ce\u30fc\u30c9\u3092\u524a\u9664\u3057\u305f\u3068\u304d\u306b\u3001\u65e2\u5b58\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u304d\u308c\u3044\u306b\u5207\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3060\u3002\u53b3\u3057\u3044RTO\/RPO\u5236\u9650\u306e\u3042\u308b\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u79c1\u306f\u4e21\u65b9\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u308b\u3002 <strong>\u30c8\u30e9\u30f3\u30b8\u30b7\u30e7\u30f3<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/dns-vs-application-balancer-4839.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30b3\u30b9\u30c8\u3068\u904b\u55b6<\/h2>\n\n<p>\u79c1\u306fDNS\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u3092\u30de\u30cd\u30fc\u30b8\u30c9\u30b5\u30fc\u30d3\u30b9\u3068\u3057\u3066\u4e88\u7d04\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3002 <strong>\u518d\u8a2d\u8a08<\/strong>. .\u30b0\u30ed\u30fc\u30d0\u30eb\u914d\u4fe1\u306e\u5834\u5408\u3001\u62e0\u70b9\u3054\u3068\u306b\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u304c\u5fc5\u8981\u306a\u3044\u305f\u3081\u3001\u4fa1\u683c\u306f\u7de9\u3084\u304b\u306b\u4e0a\u6607\u3059\u308b\u3002\u30af\u30e9\u30a6\u30c9\u306eALB\u306f\u901a\u5e38\u3001\u6642\u9593\u5358\u4f4d\u3068\u30c7\u30fc\u30bf\u51e6\u7406\u91cf\u5358\u4f4d\u3067\u8ab2\u91d1\u3055\u308c\u3001\u9700\u8981\u306b\u5fdc\u3058\u3066\u62e1\u5f35\u3055\u308c\u308b\u3002\u30aa\u30f3\u30d7\u30ec\u30df\u30b9\u306e\u5834\u5408\u3001\u5c02\u7528\u30a2\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u3068\u5197\u9577\u8a2d\u8a08\u304c\u5fc5\u8981\u3067\u3001\u8a2d\u5099\u6295\u8cc7\u3068\u904b\u7528\u30b3\u30b9\u30c8\u304c\u5897\u52a0\u3059\u308b\u3002\u79c1\u306f\u3001\u6570\u5e74\u306b\u308f\u305f\u308bTCO\u3092\u8a08\u7b97\u3057\u3001\u30b5\u30a4\u30b8\u30f3\u30b0\u306e\u30ea\u30b9\u30af\u3092\u8a55\u4fa1\u3057\u3001\u30ed\u30c3\u30af\u30a4\u30f3\u30b3\u30b9\u30c8\u3092\u8003\u616e\u306b\u5165\u308c\u3066\u3001\u5f8c\u3067\u5927\u91d1\u3092\u6255\u3046\u3053\u3068\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u6d41\u3059<\/strong>.<\/p>\n\n<h2>\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u30fb\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\uff1aDNS + ALB<\/h2>\n\n<p>\u79c1\u306fDNS\u3092\u30b5\u30a4\u30c8\u306e\u9078\u629e\u3068\u5927\u307e\u304b\u306a\u5206\u914d\u306e\u305f\u3081\u306b\u524d\u9762\u306b\u7f6e\u304d\u3001ALB\u3092\u5730\u57df\u3054\u3068\u306b\u524d\u9762\u306b\u7f6e\u304d\u307e\u3059\u3002 <strong>\u30eb\u30fc\u30eb<\/strong> \u30a2\u30d7\u30ea\u306e\u8fd1\u304f\u306b\u3042\u308b\u3002\u30ea\u30fc\u30b8\u30e7\u30f3\u306b\u969c\u5bb3\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3001DNS\u306f\u30e6\u30fc\u30b6\u30fc\u3092\u5065\u5168\u306a\u30ea\u30fc\u30b8\u30e7\u30f3\u306b\u8a98\u5c0e\u3057\u3001ALB\u304c\u900f\u904e\u7684\u306b\u5f15\u304d\u7d99\u3050\u3002ALB\u306e\u30ab\u30ca\u30ea\u30a2\u30fb\u30eb\u30fc\u30eb\u306f\u5f90\u3005\u306b\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u304c\u4e0e\u3048\u3089\u308c\u308b\u3002\u5730\u57df\u306eALB\u3067\u8a3c\u660e\u66f8\u3092\u30d0\u30f3\u30c9\u30eb\u3057\u3001\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u306f\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u306a\u307e\u307e\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u308a\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc\u3092\u4f4e\u304f\u4fdd\u3061\u3001\u30a8\u30e9\u30fc\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u3092\u7d5e\u308b\u3053\u3068\u3067\u30b3\u30b9\u30c8\u3092\u524a\u6e1b\u3059\u308b\u3002 <strong>\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/dns_app_load_balancer_4823.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>TTL\u6226\u7565\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u30ea\u30be\u30eb\u30d0\u306e\u52d5\u4f5c<\/h2>\n<p>\u79c1\u306fTTL\u3092\u30b9\u30a4\u30c3\u30c1\u30f3\u30b0\u901f\u5ea6\u3060\u3051\u3067\u306a\u304f\u3001\u5b9f\u8cea\u7684\u306a\u901f\u5ea6\u306b\u3088\u3063\u3066\u6c7a\u5b9a\u3057\u3066\u3044\u308b\u3002 <strong>\u30ea\u30be\u30eb\u30d0\u306e\u52d5\u4f5c<\/strong>. .\u77ed\u3044TTL\uff0830\uff5e60\u79d2\uff09\u306f\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc\u3092\u52a0\u901f\u3055\u305b\u308b\u304c\u3001DNS\u30af\u30a8\u30ea\u91cf\u3092\u5897\u3084\u3057\u3001\u7a4d\u6975\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u3067\u306f\u7121\u610f\u5473\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u9577\u3044TTL\uff085\uff5e15\u5206\uff09\u306f\u30d4\u30fc\u30af\u3092\u30b9\u30e0\u30fc\u30ba\u306b\u3057\u307e\u3059\u304c\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u8abf\u6574\u3092\u9045\u3089\u305b\u307e\u3059\u3002\u30cd\u30ac\u30c6\u30a3\u30d6\u30ad\u30e3\u30c3\u30b7\u30e5\uff08NXDOMAIN\uff09\u3068 <strong>\u30b5\u30fc\u30d6\u30b9\u30c6\u30fc\u30eb<\/strong>-\u30a8\u30e9\u30fc\u767a\u751f\u6642\u306b\u306f\u3001\u305d\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u304c\u5f37\u304f\u5f71\u97ff\u3059\u308b\u3002\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u30b5\u30fc\u30d3\u30b9\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306f\u6df7\u5408\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u3068\u3063\u3066\u3044\u308b\uff1a\u30b3\u30a2\u30fb\u30db\u30b9\u30c8\u306f\u77ed\u304f\u3001\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30fb\u30b3\u30f3\u30c6\u30f3\u30c4\u306f\u9577\u304f\u3059\u308b\u3002 <strong>\u30ea\u30b9\u30da\u30af\u30c8<\/strong>.<\/p>\n<p>\u79c1\u306f\u30c7\u30e5\u30a2\u30eb\u30b9\u30bf\u30c3\u30af\u306e\u52b9\u679c\u3092\u8003\u616e\u3057\u3066\u3044\u308b\uff1a\u3042\u308b\u30ea\u30be\u30eb\u30d0\u306fAAAA\u3092\u597d\u307f\u3001\u4ed6\u306e\u30ea\u30be\u30eb\u30d0\u306fA\u3092\u597d\u307f\u307e\u3059\u3002 <strong>\u30cf\u30c3\u30d4\u30fc\u30a2\u30a4\u30dc\u30fc\u30eb\u30ba<\/strong>. .IPv4\/IPv6\u9593\u306e\u7570\u306a\u308b\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u6027\u306f\u3001\u5206\u6563\u3068\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc\u3092\u6b6a\u3081\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u30d7\u30ed\u30c8\u30b3\u30eb\u30d5\u30a1\u30df\u30ea\u30fc\u3054\u3068\u306b\u5206\u3051\u3066\u76e3\u8996\u3057\u3001ALB\u3067\u4e00\u8cab\u3057\u305f\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc\u3092\u78ba\u4fdd\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30d8\u30c3\u30c0\u30fc<\/strong> (X-Forwarded-For)\u3092\u4f7f\u3063\u3066\u30c8\u30ec\u30fc\u30b5\u30d3\u30ea\u30c6\u30a3\u3092\u78ba\u4fdd\u3057\u3066\u3044\u308b\u3002\u30b9\u30d7\u30ea\u30c3\u30c8\u30db\u30e9\u30a4\u30ba\u30f3DNS\u306f\u3001\u30c7\u30d0\u30c3\u30b0\u3092\u96e3\u89e3\u306b\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u5185\u90e8\u3068\u5916\u90e8\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u304d\u308c\u3044\u306b\u5206\u3051\u308b\u306e\u306b\u5f79\u7acb\u3064\u3002.<\/p>\n\n<h2>\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8\u3001GeoDNS\u3001\u30c7\u30fc\u30bf\u30ec\u30b8\u30c7\u30f3\u30b7\u30fc<\/h2>\n<p>\u3068\u4e00\u7dd2\u306b <strong>\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8<\/strong> 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<strong>\u30dd\u30ea\u30b7\u30fc<\/strong> \u73fe\u5730\u3067.<\/p>\n\n<h2>ALB\u306b\u304a\u3051\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9<\/h2>\n<p>TLS\u3092\u4e00\u5143\u7684\u306b\u7d42\u4e86\u3055\u305b\u3001\u6b21\u306e\u3088\u3046\u306b\u8a2d\u5b9a\u3059\u308b\u3002 <strong>\u5f37\u529b\u306a\u6697\u53f7<\/strong> \u4e00\u65b9\u3001\u79c1\u306fTLS\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3068HSTS\u3092\u7ba1\u7406\u3057\u3066\u3044\u308b\u3002\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3067\u306f\u3001ID\u3092\u53b3\u5bc6\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306bmTLS\u3092\u4f7f\u3046\u3002ALB\u3067\u306f\u3001\u53d7\u4fe1\u30d8\u30c3\u30c0\u3092\u6a19\u6e96\u5316\u3057\u3001\u4ee5\u4e0b\u306e\u3082\u306e\u3092\u524a\u9664\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002 <strong>\u5371\u967a<\/strong> \u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u4f7f\u7528\u3057\u3001X-Forwarded-For\/Proto\/Host\u3092\u5236\u5fa1\u3055\u308c\u305f\u65b9\u6cd5\u3067\u8ee2\u9001\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u30ed\u30b0\u306e\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u3001\u4e0a\u6d41\u306e\u30b5\u30fc\u30d3\u30b9\u304c\u6b63\u3057\u3044\u5224\u65ad\uff08\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3084\u30dd\u30ea\u30b7\u30fc\u30c1\u30a7\u30c3\u30af\u306a\u3069\uff09\u3092\u884c\u3046\u3002.<\/p>\n<p>\u79c1\u306fALB\u3067\u30ec\u30fc\u30c8\u5236\u9650\u3001\u30dc\u30c3\u30c8\u7ba1\u7406\u3001IP\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u7de9\u548c\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u6539\u5584\u3057\u307e\u3057\u305f\u3002 <strong>\u30af\u30ea\u30fc\u30f3<\/strong> \u306e\u307e\u307e\u3067\u3042\u308b\u3002\u30a2\u30c3\u30d7\u30b9\u30c8\u30ea\u30fc\u30e0\u306eWAF\u306f\u65e2\u77e5\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3001\u79c1\u306f\u5404\u30d1\u30b9\u306b\u7279\u5b9a\u306e\u30eb\u30fc\u30eb\u3092\u8a2d\u5b9a\u3059\u308b\uff08\u4f8b\u3048\u3070\u3001\u30ed\u30b0\u30a4\u30f3\u3084\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u306b\u306f\u3088\u308a\u53b3\u3057\u3044\u5236\u9650\u3092\u304b\u3051\u308b\uff09\u3002DNS\u5074\u3067\u306f\u3001DNSSEC\u3068\u30be\u30fc\u30f3\u306e\u6574\u5408\u6027\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306b\u6ce8\u610f\u3092\u6255\u3063\u3066\u3044\u308b\u3002 <strong>\u4ea4\u901a\u7a83\u76d7<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/TechOffice_LoadBalancing_3576.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u89b3\u6e2c\u53ef\u80fd\u6027\u3001SLO\u3001\u30ad\u30e3\u30d1\u30b7\u30c6\u30a3\u30fb\u30d7\u30e9\u30f3\u30cb\u30f3\u30b0<\/h2>\n<p>\u79c1\u306f\u3001\u4ee5\u4e0b\u306e\u30b5\u30fc\u30d3\u30b9\u30ec\u30d9\u30eb\u76ee\u6a19\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u3002 <strong>\u7a7a\u5ba4\u72b6\u6cc1<\/strong>, 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<strong>\u30b9\u30ed\u30fc\u30b9\u30bf\u30fc\u30c8<\/strong>-\u65b0\u3057\u3044\u30ce\u30fc\u30c9\u3092\u6ce8\u610f\u6df1\u304f\u7acb\u3061\u4e0a\u3052\u308b\u4e00\u65b9\u3067\u3001\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u306e\u67af\u6e07\u304c\u30d4\u30fc\u30af\u6642\u3092\u7de9\u548c\u3059\u308b\u3002\u79c1\u306f\u5b9a\u671f\u7684\u306b\u8907\u6570\u306e\u5927\u9678\u3067\u7dcf\u5408\u30c6\u30b9\u30c8\u3092\u884c\u3063\u3066\u304a\u308a\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u6c7a\u5b9a\u304c\u5b9f\u969b\u306e <strong>\u30b2\u30a4\u30f3\u30fb\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc<\/strong> 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<strong>\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u30b8\u30e3\u30e0<\/strong> \u6570\u79d2\u3067\u5143\u306b\u623b\u305b\u308b\u3002\u79c1\u306f\u30a4\u30f3\u30d5\u30e9\u3068ALB\u306e\u30b3\u30f3\u30d5\u30a3\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u30b3\u30fc\u30c9\u3068\u3057\u3066\u6271\u3044\u3001\u30c6\u30b9\u30c8\u3057\u3001\u6bb5\u968e\u7684\u306b\u5b9f\u884c\u3059\u308b\u3002\u30ab\u30aa\u30b9\u5b9f\u9a13\uff08\u30be\u30fc\u30f3\u3084\u30d7\u30fc\u30eb\u306e\u6a19\u7684\u30b7\u30e3\u30c3\u30c8\u30c0\u30a6\u30f3\u306a\u3069\uff09\u306b\u3088\u308a\u3001\u30d8\u30eb\u30b9\u30c1\u30a7\u30c3\u30af\u3001\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc\u3001\u305d\u3057\u3066\u3001ALB\u69cb\u6210\u304c\u3001\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u304b\u3092\u691c\u8a3c\u3059\u308b\u3002 <strong>\u30c9\u30ec\u30ca\u30fc\u30b8<\/strong> \u8a08\u753b\u901a\u308a\u306b\u52d5\u304f\u3002.<\/p>\n\n<h2>\u30b3\u30b9\u30c8\u30c8\u30e9\u30c3\u30d7\u3068\u904b\u7528\u306e\u6700\u9069\u5316<\/h2>\n<p>\u79c1\u306f\u6b21\u306e\u3053\u3068\u3092\u8003\u616e\u306b\u5165\u308c\u3066\u3044\u308b\u3002 <strong>\u9000\u53bb\u8cbb\u7528<\/strong> DNS\u306e\u6c7a\u5b9a\u306f\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u306b\u5f37\u304f\u5f71\u97ff\u3059\u308b\u304b\u3089\u3060\u3002\u4e2d\u592e\u96c6\u4e2d\u578b\u306eTLS\u30aa\u30d5\u30ed\u30fc\u30c9\u306f\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u306eCPU\u3092\u524a\u6e1b\u3059\u308b\u304c\u3001\u30a2\u30a4\u30c9\u30eb\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3068\u30ad\u30fc\u30d7\u30a2\u30e9\u30a4\u30d6\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306f\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u306b\u30de\u30c3\u30c1\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002ALB\u3067\u306e\u5727\u7e2e\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u5bb9\u91cf\u306e\u8ffd\u52a0\u3088\u308a\u3082\u8ee2\u9001\u30b3\u30b9\u30c8\u3092\u524a\u6e1b\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3002.<\/p>\n<p>\u8ab2\u91d1\u30e2\u30c7\u30eb\u306e\u30c1\u30a7\u30c3\u30af\uff1aALB\u30b5\u30fc\u30d3\u30b9\u306e\u4e2d\u306b\u306f\u3001\u30ea\u30b9\u30ca\u30fc\u3001\u30eb\u30fc\u30eb\u3001LCU\/\u5bb9\u91cf\u5358\u4f4d\u3092\u5225\u3005\u306b\u8ab2\u91d1\u3059\u308b\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002\u7d30\u304b\u3059\u304e\u308b <strong>\u898f\u5236\u306e\u6012\u308a<\/strong> \u306f\u904b\u7528\u30b3\u30b9\u30c8\u304c\u9ad8\u304f\u306a\u308b\u3002DNS\u5074\u3067\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30b8\u30aa\u30ec\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u901a\u5e38\u3001\u4e2d\u7a0b\u5ea6\u306e\u30b3\u30b9\u30c8\u3067\u6e08\u3080\u3002\u5197\u9577\u306a\u30d0\u30ea\u30a2\u30f3\u30c8\u3067\u306f\u306a\u304f\u3001\u30af\u30ea\u30fc\u30f3\u306a\u30be\u30fc\u30f3\u3068\u5c11\u6570\u306e\u3088\u304f\u9078\u3070\u308c\u305f\u30ec\u30b3\u30fc\u30c9\u30bb\u30c3\u30c8\u306b\u4fa1\u5024\u304c\u3042\u308b\u3002.<\/p>\n\n<h2>\u5178\u578b\u7684\u306a\u30a8\u30e9\u30fc\u30d1\u30bf\u30fc\u30f3\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n<p>\u79c1\u306f\u3088\u304f\u898b\u308b\u3002 <strong>stale<\/strong> DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u3092\u6b20\u9665\u306e\u3042\u308b\u5b9b\u5148\u306b\u9577\u304f\u9001\u308b\u3002\u91cd\u8981\u306a\u30db\u30b9\u30c8\u306eTTL\u3092\u77ed\u304f\u3057\u3001\u8a08\u753b\u7684\u306a\u5207\u308a\u66ff\u3048\u306e\u524d\u306b\u30bf\u30fc\u30b2\u30c3\u30c8\u3092\u7d5e\u3063\u305f\u30b7\u30f3\u30af\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u3053\u308c\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002502\/504\u30a8\u30e9\u30fc\u306f\u3001\u30d8\u30eb\u30b9\u30c1\u30a7\u30c3\u30af\u306e\u30d1\u30b9\u304c\u6b63\u3057\u304f\u306a\u3044\u304b\u3001ALB\u3068\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u9593\u306eTLS\u306e\u4e0d\u4e00\u81f4\u304c\u539f\u56e0\u3067\u3042\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u30b9\u30c6\u30a3\u30c3\u30ad\u30fc\u30bb\u30c3\u30b7\u30e7\u30f3\u306f\u500b\u3005\u306e\u30ce\u30fc\u30c9\u306b\u904e\u8ca0\u8377\u3092\u304b\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u79c1\u306f\u30a2\u30d5\u30a3\u30cb\u30c6\u30a3\u30ec\u30fc\u30c8\u3092\u76e3\u8996\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u96c6\u4e2d\u578b\u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u5207\u308a\u66ff\u3048\u307e\u3059\u3002 <strong>\u30bb\u30c3\u30b7\u30e7\u30f3\u30fb\u30b9\u30c8\u30a2<\/strong>.<\/p>\n<p>\u305d\u306e\u4ed6\u306e\u5178\u578b\u7684\u306a\u4f8b\u3068\u3057\u3066\u306f\u3001X-Forwarded-Proto\u306e\u6b20\u843d\u306b\u3088\u308b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u30fb\u30eb\u30fc\u30d7\u3001PROXY\u30d8\u30c3\u30c0\u30fc\u306e\u306a\u3044\u30bd\u30fc\u30b9IP\u306e\u55aa\u5931\u3001\u30aa\u30f3\u30d7\u30ec\u30df\u30b9\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306b\u304a\u3051\u308b\u30d8\u30a2\u30d4\u30f3NAT\u3001IPv4\/IPv6\u3078\u306e\u4e00\u8cab\u6027\u306e\u306a\u3044\u30a2\u30af\u30bb\u30b9\u306a\u3069\u304c\u3042\u308b\u3002\u305d\u3053\u3067\u79c1\u306f <strong>\u30e9\u30f3\u30d6\u30c3\u30af<\/strong>-\u53ce\u96c6\uff1a\u3069\u306e\u30ed\u30b0\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u304b\u3001\u3069\u306e\u3088\u3046\u306b\u30eb\u30fc\u30c8\u3092\u691c\u8a3c\u3059\u308b\u304b\u3001\u3044\u3064DNS\u3092\u30d1\u30fc\u30b8\u3059\u308b\u304b\u3001ALB\u306e\u5f79\u5272\u3092\u3069\u306e\u7a0b\u5ea6\u8fc5\u901f\u306b\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3059\u308b\u304b\u3002.<\/p>\n\n<h2>\u6c7a\u5b9a\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2>\n<ul>\n  <li><strong>\u76ee\u6a19<\/strong>\u30b0\u30ed\u30fc\u30d0\u30eb\u30fb\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\uff08DNS\uff09\u304b\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u30fb\u30d9\u30fc\u30b9\u30fb\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\uff08ALB\uff09\u304b\uff1f<\/li>\n  <li><strong>\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc<\/strong>\u30ea\u30fc\u30b8\u30e7\u30f3\u3001\u30a4\u30b0\u30ec\u30b9\u30d1\u30b9\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u30d0\u30b8\u30a7\u30c3\u30c8\u3092\u660e\u78ba\u306b\u3059\u308b\u3002.<\/li>\n  <li><strong>\u30bb\u30c3\u30b7\u30e7\u30f3<\/strong>\u30d9\u30bf\u30d9\u30bf\u3068\u4e2d\u592e\u306e\u5e97\u3001\u89aa\u548c\u6027\u3092\u610f\u8b58\u7684\u306b\u9078\u3076\u3002.<\/li>\n  <li><strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/strong>TLS\u30dd\u30ea\u30b7\u30fc\u3001WAF\u30eb\u30fc\u30eb\u3001mTLS\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3001\u30d8\u30c3\u30c0\u30fc\u30fb\u30cf\u30fc\u30c9\u30cb\u30f3\u30b0\u3002.<\/li>\n  <li><strong>\u5065\u5eb7<\/strong>\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3001\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb\u3001\u30ea\u30ab\u30d0\u30ea\u30fc\u30ed\u30b8\u30c3\u30af\u3001\u30c9\u30ec\u30a4\u30f3\u3002.<\/li>\n  <li><strong>TTL<\/strong>\u30b9\u30a4\u30c3\u30c1\u30f3\u30b0\u901f\u5ea6\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u91cf\u306e\u30d0\u30e9\u30f3\u30b9\u3002.<\/li>\n  <li><strong>\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0<\/strong>\u30a2\u30af\u30c6\u30a3\u30d6-\u30a2\u30af\u30c6\u30a3\u30d6\u307e\u305f\u306f\u30a2\u30af\u30c6\u30a3\u30d6-\u30d1\u30c3\u30b7\u30d6\u3067\u3001\u30ad\u30e3\u30d1\u30b7\u30c6\u30a3\u30fb\u30ea\u30b6\u30fc\u30d6\u3092\u5b9a\u7fa9\u3059\u308b\u3002.<\/li>\n  <li><strong>\u89b3\u6e2c\u53ef\u80fd\u6027<\/strong>\u30eb\u30fc\u30c8\/\u30ea\u30fc\u30b8\u30e7\u30f3\u3054\u3068\u306e\u30e1\u30c8\u30ea\u30af\u30b9\u3001\u30ed\u30b0\u3001\u30c8\u30ec\u30fc\u30b9\u3001SLO\u3002.<\/li>\n  <li><strong>\u30b3\u30b9\u30c8<\/strong>TCO\u3001\u30a4\u30b0\u30ec\u30b9\u3001\u30eb\u30fc\u30eb\u3001\u30af\u30a8\u30ea\u306e\u30b3\u30b9\u30c8\u3092\u900f\u660e\u5316\u3059\u308b\u3002.<\/li>\n  <li><strong>\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8<\/strong>\u30ab\u30ca\u30ea\u30a2\uff0f\u30d6\u30eb\u30fc\u30b0\u30ea\u30fc\u30f3\u3001\u30b7\u30e3\u30c9\u30a6\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3068\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u30d7\u30e9\u30f3\u3092\u8a2d\u5b9a\u3002.<\/li>\n<\/ul>\n\n<h2>\u6c7a\u5b9a\u30de\u30c8\u30ea\u30c3\u30af\u30b9\u3068\u8868<\/h2>\n\n<p>\u79c1\u306f\u307e\u305a\u3001DNS\u3092\u4ecb\u3057\u305f\u65e9\u671f\u304b\u3064\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u6c7a\u5b9a\u304b\u3001ALB\u306b\u304a\u3051\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u30fb\u30d9\u30fc\u30b9\u306e\u6c7a\u5b9a\u304b\u3092\u78ba\u8a8d\u3057\u3001\u6b21\u306b\u30bb\u30c3\u30b7\u30e7\u30f3\u3001\u8a3c\u660e\u66f8\u3001\u89b3\u6e2c\u53ef\u80fd\u6027\u3001\u305d\u3057\u3066\u3001ALB\u306b\u304a\u3051\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u30fb\u30d9\u30fc\u30b9\u306e\u6c7a\u5b9a\u3092\u8a55\u4fa1\u3059\u308b\u3002 <strong>\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc<\/strong>. .\u4e3b\u306b\u9759\u7684\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u914d\u4fe1\u3059\u308b\u5834\u5408\u3001DNS\u30b0\u30ed\u30fc\u30d0\u30eb\u914d\u4fe1\u306e\u6069\u6075\u3092\u53d7\u3051\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u30b9\u30c6\u30fc\u30c8\u30d5\u30eb\u306aWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30b9\u30c6\u30a3\u30c3\u30ad\u30fc\u30bb\u30c3\u30b7\u30e7\u30f3\u3084TLS\u30bf\u30fc\u30df\u30cd\u30fc\u30b7\u30e7\u30f3\u306e\u3088\u3046\u306aALB\u6a5f\u80fd\u306e\u6069\u6075\u3092\u53d7\u3051\u308b\u3002\u6df7\u5728\u3057\u305f\u30b7\u30ca\u30ea\u30aa\u306f\u3001\u4e21\u65b9\u306e\u9577\u6240\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u306a\u30d0\u30ea\u30a2\u30f3\u30c8\u3067\u7d42\u308f\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u6b21\u306e\u8868\u306f\u3001\u30b3\u30a2\u3068\u306a\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3001\u4f9d\u5b58\u95a2\u4fc2\u3092\u660e\u78ba\u306b\u3059\u308b\u306e\u306b\u5f79\u7acb\u3064\u3002 <strong>\u53c2\u7167<\/strong>.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30a2\u30b9\u30da\u30af\u30c8<\/th>\n      <th>DNS\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0<\/th>\n      <th>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30fb\u30ec\u30d9\u30eb<\/td>\n      <td>DNS (OSI L7)\u3001\u4e3b\u306b\u4ee5\u4e0b\u306e\u65b9\u6cd5\u3067\u56de\u7b54\u3059\u308b\u3002 <strong>UDP<\/strong><\/td>\n      <td>HTTP\/HTTPS (OSI L7)\u7d4c\u7531 <strong>TCP<\/strong><\/td>\n    <\/tr>\n    <tr>\n      <td>\u6c7a\u65ad\u306e\u30dd\u30a4\u30f3\u30c8<\/td>\n      <td>\u3092\u6301\u3064\u3002 <strong>\u540d\u524d\u89e3\u6c7a<\/strong><\/td>\n      <td>\u6c7a\u8b70\u5f8c <strong>\u5185\u5bb9<\/strong><\/td>\n    <\/tr>\n    <tr>\n      <td>\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u57fa\u6e96<\/td>\n      <td>IP\u3001\u30b8\u30aa\u3001\u30a6\u30a7\u30a4\u30c8<\/td>\n      <td>\u30db\u30b9\u30c8\u3001\u30d1\u30b9\u3001\u30d8\u30c3\u30c0\u30fc\u3001\u30af\u30c3\u30ad\u30fc\u3001, <strong>\u65b9\u6cd5<\/strong><\/td>\n    <\/tr>\n    <tr>\n      <td>\u5065\u5eb7\u30c1\u30a7\u30c3\u30af<\/td>\n      <td>\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3068\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u30c1\u30a7\u30c3\u30af<\/td>\n      <td>\u3057\u304d\u3044\u5024\u3068\u30c7\u30a3\u30fc\u30d7URL\u30c1\u30a7\u30c3\u30af <strong>\u30ea\u30ab\u30d0\u30ea\u30fc<\/strong><\/td>\n    <\/tr>\n    <tr>\n      <td>\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u6c38\u7d9a\u6027<\/td>\n      <td>DNS\u306b\u3088\u308b\u5236\u9650\u3042\u308a <strong>\u53ef\u5909<\/strong><\/td>\n      <td>\u30b9\u30c6\u30a3\u30c3\u30ad\u30fc\u30bb\u30c3\u30b7\u30e7\u30f3\u3001\u30c8\u30fc\u30af\u30f3\u3001\u30a2\u30d5\u30a3\u30cb\u30c6\u30a3<\/td>\n    <\/tr>\n    <tr>\n      <td>\u5730\u7406\u7684\u5206\u5e03<\/td>\n      <td>\u975e\u5e38\u306b\u826f\u3044\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u56de\u7b54<\/td>\n      <td>\u5730\u57df\u7684\u306b\u5f37\u304f\u3001\u4e16\u754c\u7684\u306b\u7d4c\u7531\u3059\u308b <strong>\u30a8\u30c3\u30b8<\/strong> \u88dc\u8db3<\/td>\n    <\/tr>\n    <tr>\n      <td>TLS\/TCP\u306e\u6700\u9069\u5316<\/td>\n      <td>\u6253\u3061\u5207\u308a\u306a\u3057<\/td>\n      <td>\u30bb\u30f3\u30c8\u30e9\u30ebTLS\u30bf\u30fc\u30df\u30cd\u30fc\u30b7\u30e7\u30f3\u3068 <strong>\u30aa\u30d5\u30ed\u30fc\u30c9<\/strong><\/td>\n    <\/tr>\n    <tr>\n      <td>\u30b3\u30b9\u30c8\u30e2\u30c7\u30eb<\/td>\n      <td>\u3080\u3057\u308d\u597d\u610f\u7684\u3001\u30de\u30cd\u30fc\u30b8\u30c9DNS<\/td>\n      <td>\u7528\u9014\u306b\u5fdc\u3058\u305f\u8c4a\u5bcc\u306a\u6a5f\u80fd<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" 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