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Copy file name to clipboardExpand all lines: articles/azure-linux/intro-azure-linux.md
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ms.author: htaubenfeld
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ms.service: microsoft-linux
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ms.topic: overview
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ms.date: 06/01/2023
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ms.date: 08/29/2023
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# What is the Azure Linux Container Host for AKS?
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The Azure Linux Container Host offers the following key benefits:
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-**Secure supply chain**: Microsoft builds, signs, and validates the Azure Linux Container Host packages from source, and hosts its packages and sources in Microsoft-owned and secured platforms.
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-**Small and lightweight**: The Azure Linux Container Host only includes the necessary set of packages needed to run container workloads. As a result, it consumes limited disk and memory resources.
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-**Secure by default**: The Azure Linux Container Host has an emphasis on security and follows the secure-by-default principles, including using a hardened Linux kernel with Azure cloud optimizations and flags tuned for Azure. It also provides a reduced attack surface and eliminates patching and maintenance of unnecessary packages. For more information on Azure Linux Container Host security principles, see the [AKS security concepts](../../articles/aks/concepts-security.md).
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-**Extensively validated**: The AKS and Azure Linux teams run a suite of functional and performance regression tests with the Azure Linux Container Host before releasing to customers, which enables earlier issue detection and mitigation.
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-**Small and lightweight**
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- The Azure Linux Container Host only includes the necessary set of packages needed to run container workloads. As a result, it consumes limited disk and memory resources.
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- Azure Linux has only 500 packages, and as a result takes up the least disk space by up to *5 GB* on AKS.
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-**Reliable supply chain**
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- The Linux and AKS teams at Microsoft build, sign, and validate the Azure Linux Container Host packages from source, and host packages and sources in Microsoft-owned and secured platforms.
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- Each package update runs through a full set of unit tests and end-to-end testing on the existing image to prevent regressions. This, in combination with the smaller package count, reduces the chances of disruptive updates to applications.
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-**Secure by default**
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- The Azure Linux Container Host has an emphasis on security and follows the secure-by-default principles, including using a hardened Linux kernel with Azure cloud optimizations and flags tuned for Azure. It also provides a reduced attack surface and eliminates patching and maintenance of unnecessary packages.
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- Microsoft monitors the CVE database and releases security patches monthly and critical updates within days if required.
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- Azure Linux passes all the CIS Level 1 benchmarks, making it the only Linux distribution on AKS that does so.
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- For more information on Azure Linux Container Host security principles, see the [AKS security concepts](../../articles/aks/concepts-security.md).
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-**Extensive compatibility**
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- All existing and future AKS extensions, add-ons, and open-source projects on AKS support both Ubuntu and Azure Linux. This includes support for runtime components like Dapr, IaC tools like Terraform, and monitoring solutions like Dynatrace.
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- Azure Linux ships with containerd as its container runtime and the upstream Linux kernel, which enables existing containers based on Linux images (like Alpine) to work seamlessly on Azure Linux.
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