{"id":4560,"date":"2013-09-18T09:33:36","date_gmt":"2013-09-18T07:33:36","guid":{"rendered":"http:\/\/www.thomas-krenn.com\/de\/tkmag\/?p=4560"},"modified":"2019-09-27T14:05:46","modified_gmt":"2019-09-27T12:05:46","slug":"loadbalancer-eigenbau-leicht-gemacht","status":"publish","type":"post","link":"https:\/\/www.thomas-krenn.com\/de\/tkmag\/expertentipps\/loadbalancer-eigenbau-leicht-gemacht\/","title":{"rendered":"Loadbalancer \u2013 \u201eEigenbau\u201c leicht gemacht"},"content":{"rendered":"<p>Ein Loadbalancer sorgt daf\u00fcr, dass ein Dienst, der entweder \u00fcber das Internet oder ein internes Netzwerk zur Verf\u00fcgung gestellt wird, st\u00e4ndig verf\u00fcgbar ist. Ob man einen Loadbalancer ben\u00f6tigt, l\u00e4sst sich sehr einfach untersuchen:<\/p>\n<ul class=\"list arrow\">\n<li>Kann der Dienst leistungstechnisch nicht mehr nur durch einen Server allein bereitgestellt werden?<\/li>\n<\/ul>\n<ul class=\"list arrow\">\n<li>Muss der Dienst 24&#215;7 zug\u00e4nglich sein?<\/li>\n<\/ul>\n<p>Wie in allen Bereichen gibt es auch bei Loadbalancer eine Vielzahl an Anbietern: F5, Citrix, Kemp uvm. Vor allem durch den rasanten Anstieg an Diensten, die weltweit zur Verf\u00fcgung gestellt werden sollen, ben\u00f6tigt man einen Loadbalancer, entweder gehostet oder in der eigenen IT-Umgebung. Dabei muss man jedoch nicht auf properit\u00e4re Hersteller zur\u00fcckgreifen, die das &#8222;All-in-one&#8220; Paket anbieten, sondern kann sich den Load Balancer sehr einfach mit offenen Server-Systemen und Open Source Software selber bauen. Denn um die Konfiguration kommt man sowieso nicht umhin.<\/p>\n<p>Die Logik eines Loadbalancer ist recht simple: Daten aufgrund von Regeln mehr oder weniger intelligent verteilen. Diese Anforderung l\u00e4sst sich ohne Probleme mit einem normalen Server-System und entsprechender Open Source Produkte abdecken.<\/p>\n<p>Welche Open Source Software gibt es derzeit auf dem Markt?<\/p>\n<ul class=\"list arrow\">\n<li><a title=\"Zen Loadbalancer\" href=\"http:\/\/www.zenloadbalancer.com\/\" target=\"_blank\" rel=\"noopener\">Zen Loadbalancer<\/a>\u00a0 \u2013 Mit grafischer Oberfl\u00e4che<\/li>\n<\/ul>\n<ul class=\"list arrow\">\n<li><a title=\"Linux Virtual Server\" href=\"http:\/\/de.wikipedia.org\/wiki\/Linux_Virtual_Server\" target=\"_blank\" rel=\"noopener\">Linux Virtual Server<\/a> <\/li>\n<\/ul>\n<p>Man sollte dabei die Methoden beachten die zur Verteilung der Daten herangezogen werden (Round Robin, Hash Funktionen, etc).<\/p>\n<p>Hardwareseitig ist ein Loadbalancer sehr anspruchslos:<\/p>\n<ul class=\"list arrow\">\n<li>2,0 GHz Dual-Core CPU<\/li>\n<\/ul>\n<ul class=\"list arrow\">\n<li>4GB RAM<\/li>\n<\/ul>\n<ul class=\"list arrow\">\n<li>Entsprechend Netzwerkkarten f\u00fcr die verschiedenen Netze<\/li>\n<\/ul>\n<p>Entscheidend f\u00fcr die Dimensionierung der Hardware ist beim Loadbalancer, wie auch bei TKshop-Systemen, die Anzahl der Sessions oder Verbindungen. Mit der oben genannten Konfiguration lassen sich mehrere 100.000 Sessions gleichzeitig bedienen. Der notwendige RAM Bedarf l\u00e4sst sich folgenderma\u00dfen ausrechnen:<br \/>\nGr\u00f6\u00dfe eines Sessioneintrags im RAM (siehe Anbieterspezifikation) * Anzahl Sessions = Mindestmenge an RAM.<\/p>\n<p>&nbsp;<\/p>\n<div style=\"background-color: #f2f2f2; padding: 15px; height: auto; vertical-align: middle;\">\n<div style=\"display: inline-block; background-color: #f2f2f2; margin-right: 15px; vertical-align: middle; width: 80px; height: auto;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-8932\" src=\"https:\/\/www.thomas-krenn.com\/de\/tkmag\/wp-content\/uploads\/2013\/07\/Logo_Shop_TKmag_klein.png\" alt=\"Logo_Shop_TKmag_klein\" width=\"86\" height=\"29\" \/><\/div>\n<div style=\"display: inline-block; background-color: #000000; vertical-align: middle; width: 1px; height: 27px;\"><\/div>\n<div style=\"display: inline-block; background-color: #f2f2f2; margin-left: 15px; vertical-align: middle; width: 80%;\">Vorschl\u00e4ge f\u00fcr Ihre individuelle Loadbalancer &#8211; L\u00f6sung finden Sie in unserem <a title=\"Thomas Krenn Shop\" href=\"https:\/\/www.thomas-krenn.com\/de\/produkte\/zubehoer-und-service\/loadbalancer.html\" target=\"_blank\" rel=\"noopener\">TKshop<\/a>.<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ein Loadbalancer sorgt daf\u00fcr, dass ein Dienst, der entweder \u00fcber das Internet oder ein internes Netzwerk zur Verf\u00fcgung gestellt wird, st\u00e4ndig verf\u00fcgbar ist. Ob man einen Loadbalancer ben\u00f6tigt, l\u00e4sst sich[&#8230;]<\/p>\n","protected":false},"author":21,"featured_media":6319,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[45,107],"tags":[134],"class_list":["post-4560","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-expertentipps","category-netzwerk-zubehoer","tag-know-how","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Loadbalancer \u2013 \u201eEigenbau\u201c leicht gemacht - Loadmaster<\/title>\n<meta name=\"robots\" content=\"noindex, nofollow\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Loadbalancer \u2013 \u201eEigenbau\u201c leicht gemacht - Loadmaster\" \/>\n<meta property=\"og:description\" content=\"Ein Loadbalancer sorgt daf\u00fcr, dass ein Dienst, der entweder \u00fcber das Internet oder ein internes Netzwerk zur Verf\u00fcgung gestellt wird, st\u00e4ndig verf\u00fcgbar ist. 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