{"id":5004,"date":"2014-02-04T10:54:51","date_gmt":"2014-02-04T09:54:51","guid":{"rendered":"http:\/\/www.solucominsight.fr\/?p=5004"},"modified":"2015-01-21T09:52:59","modified_gmt":"2015-01-21T08:52:59","slug":"sans-maitrise-le-cloud-nest-rien","status":"publish","type":"post","link":"https:\/\/www.riskinsight-wavestone.com\/en\/2014\/02\/sans-maitrise-le-cloud-nest-rien\/","title":{"rendered":"Sans ma\u00eetrise, le Cloud n\u2019est rien…"},"content":{"rendered":"

L\u2019approche Cloud est par essence une approche \u00ab sur \u00e9tag\u00e8re \u00bb. Les entreprises sont naturellement conduites \u00e0 souscrire diff\u00e9rents services Cloud, chacun \u00e9tant le meilleur de ce que sait offrir le march\u00e9 sur son p\u00e9rim\u00e8tre. Mais sans vision d\u2019ensemble et sans anticipation, on s\u2019expose \u00e0 une mise en silos pr\u00e9judiciable. Le SI perd alors en agilit\u00e9, en exploitabilit\u00e9, voire en performance \u00e9conomique\u2026 soit l\u2019oppos\u00e9 des r\u00e9sultats escompt\u00e9s. Voici quelques conseils pour ne pas se perdre dans les nuages et garder la main.<\/p>\n

Les 4 cl\u00e9s de l\u2019int\u00e9gration des services Cloud<\/h2>\n

1 – Une int\u00e9gration des donn\u00e9es sans couture<\/strong><\/p>\n

Avec l\u2019utilisation de services Cloud, on exacerbe le besoin de mettre en place des plateformes transverses d\u2019\u00e9changes entre les diff\u00e9rentes ressources, qu\u2019elles soient Cloud ou internes. Cette probl\u00e9matique est essentiellement pr\u00e9sente lorsque l\u2019on s\u2019appuie sur des services SaaS.<\/p>\n

Il s\u2019agit ainsi soit d\u2019\u00e9tendre les plateformes d\u2019\u00e9changes traditionnelles aux services Cloud si elles offrent des connecteurs vers les interfaces (API) des applications Cloud, soit de s\u2019appuyer sur des services d\u2019\u00e9changes relais (Cloud ou internalis\u00e9s), qui masqueront la complexit\u00e9 des interfaces et de leur \u00e9volution.<\/p>\n

2 – Une gestion centralis\u00e9e des identit\u00e9s<\/strong><\/p>\n

Celle-ci est essentielle pour fournir aux utilisateurs un acc\u00e8s sans couture \u00e0 l\u2019ensemble du SI, qu\u2019il soit en mode Cloud ou non. Elle doit notamment permettre de g\u00e9rer le cycle de vie des comptes utilisateurs (d\u00e9commissionnement, gestion du mot de passe\u2026).<\/p>\n

Cet aspect est trop souvent n\u00e9glig\u00e9. Il arrive par exemple de laisser des acc\u00e8s ouverts \u00e0 des employ\u00e9s ayant quitt\u00e9 la soci\u00e9t\u00e9, l\u2019exposant \u00e0 de la surfacturation et \u00e0 d\u2019importantes br\u00e8ches de s\u00e9curit\u00e9. La DSI doit donc mettre en \u0153uvre une gouvernance des identit\u00e9s globale ainsi que l\u2019outillage ad\u00e9quat.<\/p>\n

3 – Des r\u00e9f\u00e9rentiels communs de service management<\/strong><\/p>\n

Pour que la DSI puisse garantir les niveaux de services de l\u2019outil informatique (disponibilit\u00e9, impact des changements, capacit\u00e9 d\u2019\u00e9volution\u2026), il est n\u00e9cessaire qu\u2019elle puisse int\u00e9grer les services Cloud \u00e0 ses r\u00e9f\u00e9rentiels de service management. Ils auront notamment un r\u00f4le primordial pour g\u00e9rer les changements. En effet, les services Cloud \u00e9voluent constamment, en cycle rapide, sans que les clients puissent s\u2019y opposer. Les analyses d\u2019impacts doivent donc \u00eatre pr\u00e9cises et le plus automatis\u00e9es possible. Pour s\u2019adapter au Cloud, les r\u00e9f\u00e9rentiels devront int\u00e9grer des ressources fournies en mode as-a-Service, pour lesquels les aspects de localisation ou de d\u00e9pendance \u00e0 des ressources physiques ne sont pas connus.<\/p>\n

4 – Des portails de services par usage<\/strong><\/p>\n

L\u2019une des composantes essentielles du Cloud est l\u2019aspect self-service. Pour optimiser l\u2019apport des services Cloud, il est primordial de limiter le nombre de points d\u2019entr\u00e9es pour les demandes de ressources, les d\u00e9clarations d\u2019incidents et le suivi des consommations, et ce quel que soit le nombre de fournisseurs.<\/p>\n

En revanche, il n\u2019est pas n\u00e9cessaire de se limiter \u00e0 une seule interface globale pour l\u2019ensemble des services de la DSI. Il s\u2019agit ici de f\u00e9d\u00e9rer les diff\u00e9rents portails de services qui seront instanci\u00e9s par typologie d\u2019usage et de population. Pour ce faire, il faut anticiper au plus t\u00f4t une cible globale d\u2019int\u00e9gration puis s\u2019appuyer sur un outillage adapt\u00e9 aux services souscrits et \u00e0 l\u2019existant. Cet outillage est \u00e0 d\u00e9ployer progressivement \u00e0 l\u2019occasion de chaque projet Cloud jusqu\u2019\u00e0 atteindre la cible.<\/p>\n

\"\"<\/a><\/p>\n

Une strat\u00e9gie d\u2019outillage \u00e0 d\u00e9finir en fonction de la strat\u00e9gie Cloud<\/h2>\n

La cible d\u2019outillage sera \u00e0 d\u00e9finir en fonction de la strat\u00e9gie Cloud. Dans une strat\u00e9gie \u00e0 dominante SaaS, le challenge majeur sera d\u2019int\u00e9grer sans couture les nouvelles applications au SI. Il faudra donc en priorit\u00e9 traiter les probl\u00e9matiques d\u2019int\u00e9gration de donn\u00e9es, la gestion unifi\u00e9e des identit\u00e9s et le portail de services. Si la strat\u00e9gie Cloud est essentiellement IaaS, les enjeux seront plut\u00f4t li\u00e9s \u00e0 la gestion de ce nouveau parc de ressources. Il faudra alors se doter rapidement d\u2019un outillage permettant d\u2019adresser la probl\u00e9matique de service management.<\/p>\n

Deux types d\u2019acteurs constituent actuellement le march\u00e9 de l\u2019outillage Cloud, qui est en phase d\u2019\u00e9volution rapide. D\u2019un c\u00f4t\u00e9, des startups aux offres fonctionnellement riches mais dont la p\u00e9rennit\u00e9 n\u2019est pas toujours assur\u00e9e. De l\u2019autre, des fournisseurs traditionnels avec des offres qui sont soit balbutiantes, soit issues de rachats r\u00e9cents, donc peu int\u00e9gr\u00e9es au reste de leur gamme et en passe de subir des \u00e9volutions majeures.<\/p>\n

Ces solutions n\u2019\u00e9tant pas pleinement satisfaisantes, deux strat\u00e9gies de d\u00e9ploiement s\u2019offrent aux entreprises.<\/p>\n

Si l\u2019on est dans un rythme d\u2019adoption du Cloud plut\u00f4t lent<\/strong>, mieux vaut temporiser en s\u2019appuyant sur l\u2019outillage existant et en l\u2019adaptant au cas par cas. Par exemple, des transferts de fichiers non automatis\u00e9s peuvent suffire dans un 1er temps pour assurer le provisioning des identit\u00e9s. Cette strat\u00e9gie \u00e9vite d\u2019investir dans des solutions peut-\u00eatre non p\u00e9rennes, au prix d\u2019un surco\u00fbt mod\u00e9r\u00e9 en op\u00e9rations.<\/p>\n

En revanche, si l\u2019on souhaite adopter une d\u00e9marche volontariste et cadenc\u00e9e vers le Cloud<\/strong>, il n\u2019est plus possible de temporiser au risque de voir exploser ses co\u00fbts d\u2019op\u00e9rations. Il faut donc exp\u00e9rimenter ce que le march\u00e9 sait fournir ! L\u2019outillage Cloud-ready, qu\u2019il permette l\u2019int\u00e9gration de donn\u00e9es, la gestion des identit\u00e9s et le service management ou offre un portail de service, embarque de toute fa\u00e7on un ensemble de connecteurs vers\u00a0 les fournisseurs du march\u00e9. Charge ensuite \u00e0 l\u2019\u00e9diteur de la solution de les maintenir \u00e0 jour en fonction des \u00e9volutions apport\u00e9es par les fournisseurs Cloud.<\/p>\n

Dans tous les cas, un imp\u00e9ratif\u00a0: rester en veille permanente pour adapter sa strat\u00e9gie aux \u00e9volutions des standards, \u00e0 leur niveau d\u2019adoption par le march\u00e9 et aux mouvements de consolidation.<\/p>\n","protected":false},"excerpt":{"rendered":"

L\u2019approche Cloud est par essence une approche \u00ab sur \u00e9tag\u00e8re \u00bb. Les entreprises sont naturellement conduites \u00e0 souscrire diff\u00e9rents services Cloud, chacun \u00e9tant le meilleur de ce que sait offrir le march\u00e9 sur son p\u00e9rim\u00e8tre. Mais sans vision d\u2019ensemble et…<\/p>\n","protected":false},"author":300,"featured_media":2461,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"page-templates\/tmpl-one.php","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[44,1209,1070],"coauthors":[2545],"class_list":["post-5004","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-strategie-projets-it","tag-cloud-computing","tag-integration","tag-outillage"],"acf":[],"yoast_head":"\nSans ma\u00eetrise, le Cloud n\u2019est rien... - RiskInsight<\/title>\n<meta name=\"description\" content=\"L\u2019approche Cloud est par essence une approche \u00ab sur \u00e9tag\u00e8re \u00bb. Les entreprises sont naturellement conduites \u00e0 souscrire diff\u00e9rents services Cloud, chacun \u00e9tant le meilleur de ce que sait offrir le march\u00e9 sur son p\u00e9rim\u00e8tre. Mais sans vision d\u2019ensemble et sans anticipation, on s\u2019expose \u00e0 une mise en silos pr\u00e9judiciable.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.riskinsight-wavestone.com\/2014\/02\/sans-maitrise-le-cloud-nest-rien\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sans ma\u00eetrise, le Cloud n\u2019est rien... - RiskInsight\" \/>\n<meta property=\"og:description\" content=\"L\u2019approche Cloud est par essence une approche \u00ab sur \u00e9tag\u00e8re \u00bb. Les entreprises sont naturellement conduites \u00e0 souscrire diff\u00e9rents services Cloud, chacun \u00e9tant le meilleur de ce que sait offrir le march\u00e9 sur son p\u00e9rim\u00e8tre. 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