One Article Review
| Source |  AlienVault Blog |
|---|---|
| Identifiant | 2707520 |
| Date de publication | 2021-04-28 10:00:00 (vue: 2021-04-28 10:05:37) |
| Titre | What Docker runtime deprecation means for your Kubernetes |
| Texte | This blog was written by an independent guest blogger. On December 8, 2020, Kubernetes released version 1.20—the third and final release of the popular container orchestration platform in 2020. Kubernetes noted in a blog post that the version contained 42 enhancements. Of those enhancements, 16 entered into alpha, while the remainder moved to beta or graduated to stable at 15 and 11, respectively. That’s not all that was in Kubernetes version 1.20, however. The new release also came with the announcement of dockershim’s forthcoming deprecation. This blog post will discuss what this change means to admins and provide some recommendations on how admins can respond. Before we do that, however, we need to cover the basics of how dockershim relates to Kubernetes and why the platform decided to deprecate the component in the first place. An Overview of Dockershim Dockershim is a module used by the kubelet to support Container Runtime Interface (CRI) for Docker. Released back with Kubernetes version 1.5 in 2016, CRI is a plugin that allows the kubelet to use different container runtimes without recompiling. Those Kubernetes-supported software that are responsible for containers include containerd, CRI-O and Docker for the next few months, at least. The issue with dockershim is that this container runtime predates Kubernetes’ release of CRI. As noted in its documentation, Kubernetes’ early releases offered compatibility with just one container runtime: Docker. That changed as time went on and as cluster operators expressed the desire to interact with other container runtimes. Kubernetes created CRI to help those cluster operators, but as its support of Docker came before CRI, the container orchestration platform had to come up with an adaptor component that helped the kubelet interact with the Docker container runtime as if it were a CRI compatible runtime. This led to the emergence of dockershim. Keeping dockershim around ultimately created problems for Kubernetes, however. The issue here is that the kubelet needs to call another component—dockershim—before it can interact with continerd, CRI-O or another supported CRI. It’s a middle man that complicates container runtimes for the platform as a whole. Indeed, in the words of Kubernetes, “that’s not great, because it gives us another thing that has to be maintained and can possibly break.” Dockershim was only meant to be a temporary solution. Acknowledging that fact, the task of maintaining dockershim had become sufficiently problematic by the end of 2020 that it placed “a heavy burden on the Kubernetes maintainers,” according to the platform. Hence Kubernetes’ decision to deprecate the component. Going forward, Kubernetes will inform administrators of this deprecating issue starting in version 1.20. As explained by StackRox in a blog post: If you currently use a managed Kubernetes service or a distribution like OpenShift, your provide |
| Envoyé | Oui |
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| Stories | Uber |
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