{"id":2495,"date":"2012-02-07T12:22:00","date_gmt":"2012-02-07T11:22:00","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/oracle-weblogic-essentials-avantages-du-clustering\/"},"modified":"2012-02-07T12:22:00","modified_gmt":"2012-02-07T11:22:00","slug":"oracle-weblogic-essentials-avantages-du-clustering","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/oracle-weblogic-essentials-avantages-du-clustering\/","title":{"rendered":"Oracle WebLogic Essentials : avantages du clustering"},"content":{"rendered":"<p>J&#8217;ai eu le plaisir de suivre une formation chez Oracle University \u00e0 Colombes (Paris). En tant que stagiaire, le cours s&#8217;intitulait Oracle WebLogic Administration Essential. Ce post traite de la notion de cluster WebLogic. J&#8217;y expose les avantages du clustering WebLogic, les principaux \u00e9l\u00e9ments \u00e0 conna\u00eetre ainsi qu&#8217;un exemple de configuration via la console d&#8217;administration.<\/p>\n<h4>Cluster weblogic :<\/h4>\n<p>Un cluster WebLogic est compos\u00e9 de 1 ou plusieurs instances weblogic qui peuvent \u00eatre d\u00e9pos\u00e9es sur 1 ou plusieurs machines diff\u00e9rentes. Chaque instance prend en charge des fonctionnalit\u00e9s qui permettent d&#8217;assurer une haute disponibilit\u00e9 pour des serveurs entiers, des services et application Web, des applications EJB, des ressources JDBC ou encore JMS.<\/p>\n<h4>Les avantages de la clusterisation :<\/h4>\n<ul>\n<li>l&#8217;\u00e9volutivit\u00e9 architecturale<\/li>\n<li>l&#8217;\u00e9quilibrage de la charge (load balancer)<\/li>\n<li>le basculement en cas d&#8217;incident<\/li>\n<\/ul>\n<p>Le mode actif\/actif utilis\u00e9 par weblogic permet d&#8217;assurer la disponibilit\u00e9, met \u00e0 profit la puissance de calcul ainsi que la &#8220;scalability&#8221; (mont\u00e9 en charge). Les notions de cluster horizontal (disponibilit\u00e9) et vertical (profit de la puissance de calcul) sont ainsi mis \u00e0 profit par ce mode.<\/p>\n<h4>Equilibrage de la charge :<\/h4>\n<p>WebLogic prend en charge les algorithmes d&#8217;\u00e9quilibrage de la charge tel que Round-robin, de pond\u00e9ration (weight based), al\u00e9atoire (random), ainsi que la notion d&#8217;affinit\u00e9.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1001.jpg\" alt=\"WlsAdmin1001\" width=\"618\" height=\"150\" \/><\/p>\n<h4>Cr\u00e9ation d&#8217;un cluster dans WebLogic.<\/h4>\n<p>La mise en place d&#8217;un cluster dans WebLogic se fait directement depuis la console d&#8217;administration ou via les outils de script WLST bas\u00e9s sur le language Jython. Nous d\u00e9crirons ici la mise en place d&#8217;un cluster directement depuis la console d&#8217;administration :<\/p>\n<p>Pour notre exemple, les \u00e9l\u00e9ments suivants doivent \u00eatre pr\u00e9alablement cr\u00e9\u00e9s<\/p>\n<ul>\n<li>Serveurs g\u00e9r\u00e9s<\/li>\n<li>Machines<\/li>\n<li>Les affectations de machines et serveurs g\u00e9r\u00e9s<\/li>\n<li>Les gestionnaires de noeud pour chaque machine.<\/li>\n<\/ul>\n<p>Les gestionnaires de noeuds doivent pr\u00e9alablement \u00eatre configur\u00e9s pour pouvoir g\u00e9rer les serveurs g\u00e9r\u00e9s et les red\u00e9marrer automatiquement si n\u00e9cessaires.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1002.jpg\" alt=\"WlsAdmin1002\" width=\"535\" height=\"223\" \/><\/p>\n<p>Dans notre exemple, nous allons cr\u00e9er deux cluster h\u00e9berg\u00e9s sur des machines diff\u00e9rentes. Ainsi, lorsque le cluster 1 est appel\u00e9 par les requ\u00eates des clients, celui-ci va les dispatcher entre les serveurs ManServ1 et ManServ2. Si l&#8217;un deux n&#8217;est pas disponible, les requ\u00eates des clients seront rout\u00e9s vers l&#8217;autre serveur.\u00a0 Les notions tels que les affinit\u00e9s et les r\u00e9plications \u00a0ne sont pas trait\u00e9s dans ce post. Le but est de pr\u00e9sent\u00e9 succinctement les clusters Weblogic.<\/p>\n<p>Le cluster2 peut h\u00e9berger des applications et services consomm\u00e9s par les applications du cluster1 ou d&#8217;autres applications et services d&#8217;autres cluster.<\/p>\n<p>Pour cr\u00e9er un cluster, depuis la console d&#8217;administration de WebLogic, selectionnez cluster dans Domain Structure :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1003.jpg\" alt=\"WlsAdmin1003\" width=\"227\" height=\"209\" \/><\/p>\n<p>Dans la liste des clusters, cliquez sur new pour ajouter un nouveau cluster<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1004.jpg\" alt=\"WlsAdmin1004\" width=\"329\" height=\"147\" \/><\/p>\n<p>Donnez un nom \u00e0 votre cluster et indiquez le mode de communication (par d\u00e9faut unicast)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1005.jpg\" alt=\"WlsAdmin1005\" width=\"484\" height=\"305\" \/><\/p>\n<p>Cliquez sur ok et validez les changements.<br \/>\nPour terminer, il faut encore lui assigner les serveurs qui feront partie du cluster nouvellement cr\u00e9\u00e9.<\/p>\n<p>Pour se faire, s\u00e9lectionnez le cluster et dans la page de propri\u00e9t\u00e9s onglet configuration\/servers, cliquez sur add.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1006.jpg\" alt=\"WlsAdmin1006\" width=\"607\" height=\"301\" \/><\/p>\n<p>Le formulaire suivant permet d&#8217;affecter un serveur. Vous pouvez soit choisir un serveur existant ou directement en cr\u00e9er un nouveau:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1007.jpg\" alt=\"WlsAdmin1007\" width=\"392\" height=\"279\" \/><\/p>\n<p>Vous pouvez \u00e9galement affecter un serveur \u00e0 un cluster si celui-ci est d\u00e9j\u00e0 cr\u00e9\u00e9 depuis les propri\u00e9t\u00e9s du serveur g\u00e9r\u00e9 :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1008.jpg\" alt=\"WlsAdmin1008\" width=\"454\" height=\"281\" \/><\/p>\n<p>Pour contr\u00f4ler, cliquer sur le lien serveur depuis Domain Structure<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1009.jpg\" alt=\"WlsAdmin1009\" width=\"216\" height=\"199\" \/><\/p>\n<p>Dans la liste des serveurs, vous avez un r\u00e9sum\u00e9 des clusters affect\u00e9s aux serveurs, les machines les h\u00e9bergeant ainsi que leurs statuts.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1010.jpg\" alt=\"WlsAdmin1010\" width=\"428\" height=\"300\" \/><\/p>\n<p>Lorsque l&#8217;on d\u00e9marre les serveurs, le message en vert ci-apr\u00e8s d\u00e9montre l&#8217;utilit\u00e9 du gestionnaire de noeud qui est charg\u00e9 du d\u00e9marrage des serveurs ainsi que leurs red\u00e9marrages en cas d&#8217;incident.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1011.jpg\" alt=\"WlsAdmin1011\" width=\"505\" height=\"75\" \/><\/p>\n<h4>Architecture &#8220;clust\u00e9ris\u00e9e&#8221; :<\/h4>\n<p>Dans une architecture clust\u00e9ris\u00e9e, la mise en cluster des serveurs WebLogic ne suffit pas pour assurer une disponibilit\u00e9 la plus \u00e9lev\u00e9 possible des fonctionnalit\u00e9s offertes dans WebLogic car d&#8217;autres composants essentiels sont mis en amont. Dans une architecture web, il faut obligatoirement un composant capable d&#8217;interpr\u00e9ter les requ\u00eates http et les rediriger \u00e0 destination des services offerts par les serveurs weblogic mis en cluster. Nous parlerons ici de serveur web frontal muni d&#8217;un plugin WebLogic, d&#8217;un proxy serveur ou m\u00eame d&#8217;un dispatcher capable de transmettre les requ\u00eates aux serveurs WebLogic. C&#8217;est la configuration de ceux-ci qui d\u00e9termineront les clusters WebLogic. ces composants seront eux-m\u00eame mis en cluster ou multipli\u00e9 pour palier au incident qui peuvent survenir (d\u00e9faillance, panne, surcharge, etc.). De plus, lors de la mise en cluster de WebLogic, d&#8217;autres notions tels que les affinit\u00e9s de session viennent s&#8217;ajouter (persistance de l&#8217;\u00e9tat).<\/p>\n<p>Le choix d&#8217;une architecture appropri\u00e9e pour la mise en cluster doit tenir compte des facteurs suivants :<\/p>\n<ul>\n<li>Performances<\/li>\n<li>Efficacit\u00e9 de la persistance de l&#8217;\u00e9tat (par r\u00e9plication ou tout autre moyen) &#8211; affinit\u00e9 de session<\/li>\n<li>Optimisation de l&#8217;\u00e9quilibrage de la charge<\/li>\n<li>Efficacit\u00e9 du basculement en cas d&#8217;incident<\/li>\n<li>Fiabilit\u00e9 de la communication<\/li>\n<\/ul>\n<p>Nous pouvons donc citer les composants suivants :<\/p>\n<ul>\n<li>Proxy invers\u00e9 (proxy serveur tel que Apache, SQUID)<\/li>\n<li>Server Web frontal (Apache + WLS plugin ou Oracle HTTP Serveur &#8211; OHS)<\/li>\n<li>Dispatcher (load Balancer &#8211; Cisco, Alteon (env. 100&#8217;000 Euro)<\/li>\n<\/ul>\n<p>Voici un petit r\u00e9capitulatif \u00e9tabli pendant le cours, r\u00e9sumant les fonctionnalit\u00e9s de chaques composants :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/WlsAdmin1012.jpg\" alt=\"WlsAdmin1012\" width=\"637\" height=\"281\" \/><\/p>\n<p>Il est important pour un administrateur weblogic de conna\u00eetre toutes les possibilit\u00e9s afin d&#8217;assurer une disponibilit\u00e9 la plus \u00e9lev\u00e9e possible d&#8217;un serveur, d&#8217;une application, d&#8217;un service, etc.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>J&#8217;ai eu le plaisir de suivre une formation chez Oracle University \u00e0 Colombes (Paris). En tant que stagiaire, le cours s&#8217;intitulait Oracle Weblogic Administration Essential. Ce post traite de la notion de cluster Weblogic. J&#8217;y expose les avantages du clustering weblogic, les principaux \u00e9l\u00e9ments \u00e0 conna\u00eetre ainsi qu&#8217;un exemple de configuration via la console d&#8217;administration.<\/p>\n","protected":false},"author":12,"featured_media":2496,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[197],"tags":[38,45,307],"type_dbi":[],"class_list":["post-2495","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-integration-middleware","tag-cluster","tag-documentation","tag-oracle-weblogic"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Oracle WebLogic Essentials : avantages du clustering - dbi Blog<\/title>\n<meta name=\"description\" content=\"Ce post traite de la notion de cluster Weblogic. 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