--- title: Azure Linux 4.0 Quick Overview #azure #linux | daily.dev description: Azure Linux 4.0 is a Microsoft-optimized Linux image for Azure virtual machines, VM scale sets, and Azure Local, built with a small footprint and high security... canonical: https://daily.dev/posts/azure-linux-4-0-quick-overview-azure-linux-et31ont3c twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Azure Linux 4.0 Quick Overview #azure #linux | daily.dev og:description: Azure Linux 4.0 is a Microsoft-optimized Linux image for Azure virtual machines, VM scale sets, and Azure Local, built with a small footprint and high security... og:url: https://daily.dev/posts/azure-linux-4-0-quick-overview-azure-linux-et31ont3c og:image: https://api.daily.dev/og/posts/eT31Ont3c.png og:image:alt: Azure Linux 4.0 Quick Overview #azure #linux og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Azure Linux 4.0 Quick Overview #azure #linux **[John Savill's Technical Training](https://daily.dev/sources/john-savill)** · 1 min read · 0 upvotes · 0 comments ## Summary Azure Linux 4.0 is a Microsoft-optimized Linux image for Azure virtual machines, VM scale sets, and Azure Local, built with a small footprint and high security focus. A new Azure Container Host option uses an immutable OS for AKS container hosts, preventing configuration drift. Azure Linux 4.0 container images are now entering preview, offering the same Linux version Microsoft uses internally to power LinkedIn and Xbox. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is new in Azure Linux 4.0? Azure Linux 4.0 is a Microsoft-optimized Linux image for Azure virtual machines, virtual machine scale sets, and Azure Local, featuring end-to-end security, high performance, and a minimal package footprint. It also introduces Azure Container Host as an option for AKS container hosts, using an immutable OS to prevent configuration drift, plus Azure Linux 4.0 container images now entering preview. _Teams standardizing Azure infrastructure can track Azure Linux updates like this on daily.dev._ ### What is Azure Container Host and how does it prevent drift on AKS? Azure Container Host is an AKS container host option built on an immutable OS, meaning changes cannot be made to the running system after deployment. Because the OS cannot be modified in place, configuration drift is eliminated, though this option is limited to container host use cases rather than general-purpose virtual machines. _Engineers hardening AKS clusters can follow immutable OS options like this via daily.dev._ ## Similar posts on daily.dev - [Microsoft Announces Azure Linux 4.0, Its First General-Purpose Server Linux Distribution](https://daily.dev/posts/microsoft-announces-azure-linux-4-0-its-first-general-purpose-server-linux-distribution-7bccwwhhs) · InfoQ · 3 upvotes · 1 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#infrastructure](https://daily.dev/tags/infrastructure), [#azure](https://daily.dev/tags/azure) [View this post on daily.dev](https://daily.dev/posts/azure-linux-4-0-quick-overview-azure-linux-et31ont3c) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Azure Linux 4.0 Quick Overview #azure #linux","url":"https://daily.dev/posts/azure-linux-4-0-quick-overview-azure-linux-et31ont3c","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/azure-linux-4-0-quick-overview-azure-linux-et31ont3c"},"datePublished":"2026-08-31T10:47:54.361Z","dateModified":"2026-08-31T10:48:12.739Z","description":"Azure Linux 4.0 is a Microsoft-optimized Linux image for Azure virtual machines, VM scale sets, and Azure Local, built with a small footprint and high security...","image":"https://i.ytimg.com/vi/2_Wuzlxa6iw/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/2_Wuzlxa6iw/sddefault.jpg","isAccessibleForFree":true,"articleSection":"John Savill's Technical Training","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"John Savill's Technical Training","logo":"https://media.daily.dev/image/upload/s--4rApg0fT--/f_auto,q_auto/v1780213220/logos/john-savill?_a=BAMAMiWQ0","url":"https://daily.dev/sources/john-savill"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/azure-linux-4-0-quick-overview-azure-linux-et31ont3c","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"linux,infrastructure,azure","timeRequired":"PT1M","video":{"@type":"VideoObject","name":"Azure Linux 4.0 Quick Overview #azure #linux","description":"Azure Linux 4.0 is a Microsoft-optimized Linux image for Azure virtual machines, VM scale sets, and Azure Local, built with a small footprint and high security...","thumbnailUrl":"https://i.ytimg.com/vi/2_Wuzlxa6iw/sddefault.jpg","uploadDate":"2026-08-31T10:47:54.361Z","duration":"PT1M","url":"https://api.daily.dev/r/eT31Ont3c","embedUrl":"https://www.youtube.com/embed/2_Wuzlxa6iw"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"John Savill's Technical Training","item":"https://daily.dev/sources/john-savill"},{"@type":"ListItem","position":3,"name":"Azure Linux 4.0 Quick Overview #azure #linux"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/azure-linux-4-0-quick-overview-azure-linux-et31ont3c#faq","mainEntity":[{"@type":"Question","name":"What is new in Azure Linux 4.0?","acceptedAnswer":{"@type":"Answer","text":"Azure Linux 4.0 is a Microsoft-optimized Linux image for Azure virtual machines, virtual machine scale sets, and Azure Local, featuring end-to-end security, high performance, and a minimal package footprint. It also introduces Azure Container Host as an option for AKS container hosts, using an immutable OS to prevent configuration drift, plus Azure Linux 4.0 container images now entering preview. Teams standardizing Azure infrastructure can track Azure Linux updates like this on daily.dev."}},{"@type":"Question","name":"What is Azure Container Host and how does it prevent drift on AKS?","acceptedAnswer":{"@type":"Answer","text":"Azure Container Host is an AKS container host option built on an immutable OS, meaning changes cannot be made to the running system after deployment. Because the OS cannot be modified in place, configuration drift is eliminated, though this option is limited to container host use cases rather than general-purpose virtual machines. Engineers hardening AKS clusters can follow immutable OS options like this via daily.dev."}}]} ```