{"id":18483,"date":"2014-05-29T10:52:54","date_gmt":"2014-05-29T08:52:54","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=18483"},"modified":"2023-02-27T14:35:58","modified_gmt":"2023-02-27T14:35:58","slug":"cloud-differenze-tra-iaas-paas-e-saas","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/hosting\/cloud-differenze-tra-iaas-paas-e-saas\/","title":{"rendered":"Cloud: quali sono le differenze tra IaaS, PaaS e SaaS?"},"content":{"rendered":"<p>Con la grande esplosione del cloud e di servizi e tecnologie ad esso legate, sempre pi\u00f9 spesso si sente parlare di Infrastructure as a Service, Platform as a Service e Software as a Service. Ma quali sono le differenze tra <strong>IaaS, PaaS e SaaS<\/strong>?<\/p>\n<p>Per prima cosa \u00e8 importante definire le principali componenti di una piattaforma cloud:<\/p>\n<ul>\n<li><strong>spazio (o storage)<\/strong>: pu\u00f2 essere costituito da una NAS (Network Attached Storage), da una SAN (Storage Attached Network) o ancora da una struttura complessa ad hoc<\/li>\n<li><strong>nodi di calcolo<\/strong>: un sistema che gestisca la virtualizzazione dei processi (ad esempio con VMware, XEN o KVM)<\/li>\n<li><strong>controller<\/strong><\/li>\n<\/ul>\n<p>I servizi che possono essere distribuiti appoggiandosi su una <strong>piattaforma cloud<\/strong> (chiamata in questo modo se il numero di processi istanziabili \u00e8 maggiore del numero di nodi hardware, altrimenti si parla di grid computing) sono di tre tipologie distinte:<\/p>\n<ul>\n<li><strong>Infrastructure as a Service (IaaS)<\/strong>: quando si sceglie un servizio in modalit\u00e0 IaaS si ha a disposizione una virtualizzazione delle risorse hardware (CPU, RAM, spazio e schede di rete) e quindi la flessibilit\u00e0 di un&#8217;infrastruttura fisica senza l&#8217;onere della gestione della parte hardware e, soprattutto, senza la preoccupazione di dover garantire elevati livelli di accessibilit\u00e0 dei servizi (cosa di cui si occupa il fornitore del servizio). In questo caso \u00e8 possibile installare il sistema operativo scelto e creare le applicazioni dovendo per\u00f2 gestire in autonomia la distribuzione del carico computazionale su pi\u00f9 istanze. La fatturazione avviene il pi\u00f9 delle volte periodicamente, in modalit\u00e0 flat, anche se la soluzione migliore sarebbe una fatturazione &#8220;a consumo&#8221; dato che, per il fornitore, il servizio rappresenta un costo solamente quando le risorse sono effettivamente occupate.<\/li>\n<li><strong>Platform as a Service (PaaS)<\/strong>: in questo caso \u00e8 il fornitore ad occuparsi dell&#8217;infrastruttura, il cliente dovr\u00e0 solo occuparsi di sviluppare la sua applicazione facendo per\u00f2 attenzione al tipo di servizio fornito ed ai linguaggi supportati dalla piattaforma scelta: \u00e8 importante considerare con attenzione il tipo di database da utilizzare (MySQL, Oracle, MongoDB o altri) come anche il linguaggio di programmazione (PHP, Java, Python, ecc.). Anche in questo caso si sceglie una soluzione flat (vengono selezionati con attenzione lo spazio su disco, la banda, ecc.) e la fatturazione \u00e8, nella maggior parte dei casi, periodica.<\/li>\n<li><strong>Software as a Service (SaaS)<\/strong>: \u00e8 la tipologia di servizio di pi\u00f9 alto livello ed \u00e8 offerto all&#8217;utente finale (servizio software sviluppato su una piattaforma che si appoggia su un&#8217;infrastruttura). L&#8217;esempio pi\u00f9 comune di servizi SaaS \u00e8 quello delle webmail oppure delle Google Apps. La fatturazione, in questo caso, \u00e8 legata al numero delle utenze attivate.<\/li>\n<\/ul>\n<p>Conoscere le diverse tipologie di servizi offerti in ambito cloud \u00e8 di fondamentale importanza per scegliere quello pi\u00f9 adatto alle proprie esigenze.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Con la grande esplosione del cloud e di servizi e tecnologie ad esso legate, sempre pi\u00f9 spesso si sente parlare di Infrastructure as a Service, Platform as a Service e Software as a Service. Ma quali sono le differenze tra <strong>IaaS, PaaS e SaaS<\/strong>?<\/p>\n","protected":false},"author":4,"featured_media":18538,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[32],"tags":[58,248],"class_list":["post-18483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hosting","tag-cloud-computing","tag-servizi-cloud"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cloud: differenze tra IaaS, PaaS e SaaS - blog.artera.net<\/title>\n<meta name=\"description\" content=\"Con l&#039;arrivo del cloud, sempre pi\u00f9 spesso si sente parlare di Infrastructure as a Service, Platform as a Service e Software as a Service...\" \/>\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.artera.net\/it\/hosting\/cloud-differenze-tra-iaas-paas-e-saas\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cloud: differenze tra IaaS, PaaS e SaaS - blog.artera.net\" \/>\n<meta property=\"og:description\" content=\"Con l&#039;arrivo del cloud, sempre pi\u00f9 spesso si sente parlare di Infrastructure as a Service, Platform as a Service e Software as a Service...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.artera.net\/it\/hosting\/cloud-differenze-tra-iaas-paas-e-saas\/\" \/>\n<meta property=\"og:site_name\" content=\"Artera\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/artera.net\/\" \/>\n<meta property=\"article:published_time\" content=\"2014-05-29T08:52:54+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-02-27T14:35:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.artera.net\/wp-content\/uploads\/2014\/05\/cloud-iaas-saas-paas.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1\" \/>\n\t<meta property=\"og:image:height\" content=\"1\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sergio Ravera\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sergio Ravera\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.artera.net\\\/it\\\/hosting\\\/cloud-differenze-tra-iaas-paas-e-saas\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.artera.net\\\/it\\\/hosting\\\/cloud-differenze-tra-iaas-paas-e-saas\\\/\"},\"author\":{\"name\":\"Sergio Ravera\",\"@id\":\"https:\\\/\\\/www.artera.net\\\/it\\\/#\\\/schema\\\/person\\\/48ffb6b3727677643fbfd3ecf0a10aa0\"},\"headline\":\"Cloud: quali sono le differenze tra IaaS, PaaS e SaaS?\",\"datePublished\":\"2014-05-29T08:52:54+00:00\",\"dateModified\":\"2023-02-27T14:35:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.artera.net\\\/it\\\/hosting\\\/cloud-differenze-tra-iaas-paas-e-saas\\\/\"},\"wordCount\":450,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.artera.net\\\/it\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.artera.net\\\/it\\\/hosting\\\/cloud-differenze-tra-iaas-paas-e-saas\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.artera.net\\\/wp-content\\\/uploads\\\/2014\\\/05\\\/cloud-iaas-saas-paas.jpg\",\"keywords\":[\"cloud computing\",\"servizi cloud\"],\"articleSection\":[\"Hosting\"],\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.artera.net\\\/it\\\/hosting\\\/cloud-differenze-tra-iaas-paas-e-saas\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.artera.net\\\/it\\\/hosting\\\/cloud-differenze-tra-iaas-paas-e-saas\\\/\",\"url\":\"https:\\\/\\\/www.artera.net\\\/it\\\/hosting\\\/cloud-differenze-tra-iaas-paas-e-saas\\\/\",\"name\":\"Cloud: differenze tra IaaS, PaaS e SaaS - 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