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Hello and welcome to this lecture. In this lecture



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we will discuss about the various Kubernetes releases and versions.



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So what do we know about API versions in Kubernetes



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so far? We know that when we install a kubernetes cluster, we install a specific version of kubernetes.



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We can see that when we run the kubectl get nodes command.



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In this case its v1.11.3.



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In this lecture we will see how kubernetes project manages software releases.



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Let's take a closer look at that version number.



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The kubernetes release versions consists of 3 parts.



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The first is the major version, followed by the minor version and then the Patch version.  While minor



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versions are released every few months with new features and functionalities,



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patches are released more often with critical bug fixes. Just like many other popular applications out



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there,



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kubernetes follows a standard software release versioning procedure. Every few month



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It comes out with new features and functionalities through a minor release.



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The first major version 1.0 was released in July of 2015.



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As of this recording the latest stable version is 1.13.0. Whatever we have seen here are stable



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releases of kubernetes.



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Apart from this you will also see alpha and beta releases all the bug fixes and improvements first go



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into an alpha release tagged alpha in this release.



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The features are disabled by default and maybe buggy.



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Then from there they make their way to beta release where the code is well tested.



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The new features are enabled by default.



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And finally they make their way to the main stable release.



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You can find all the releases in the releases page of the Kubernetes Github repository.



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Download the kubernetes.tar.gz file and extract it to find executables for all the kubernetes



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components. The downloaded package when extracted has all the control plane components in it.



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All of them of the same version.



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Remember that there are other components within the control plane that do not have the same version



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numbers.



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The ETCD cluster and CoreDNS servers have their own versions as they are separate projects.



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The release notes of each release provides information about the supported versions of  externally



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dependent applications like ETCD and CoreDNS etc.



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Check out the links for some references.



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That was a quick overview of the release versions. In the upcoming lecture



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we will discuss how to upgrade from one version to another.