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Update Kuberbetes Blog URLs (#8612)

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- blog.kubernetes.io => kubernetes.io/blog/
- Kubernetes blog => Kuberentes Blog
- Remove *.html
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Takuya N
2018-06-16 02:19:29 +09:00
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content/en/blog/_posts/2017-10-00-Kubeadm-V18-Released.md
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@@ -4,13 +4,13 @@ date: 2017-10-25
slug: kubeadm-v18-released
url: /blog/2017/10/Kubeadm-V18-Released
---
**_Editor’s note: this post is part of a [series of in-depth articles](http://blog.kubernetes.io/2017/10/five-days-of-kubernetes-18.html) on what's new in Kubernetes 1.8_**
**_Editor’s note: this post is part of a [series of in-depth articles](https://kubernetes.io/blog/2017/10/five-days-of-kubernetes-18) on what's new in Kubernetes 1.8_**
Since its debut in [September 2016](http://blog.kubernetes.io/2016/09/how-we-made-kubernetes-easy-to-install.html), the Cluster Lifecycle Special Interest Group (SIG) has established kubeadm as the easiest Kubernetes bootstrap method. Now, we’re releasing kubeadm v1.8.0 in tandem with the release of [Kubernetes v1.8.0](http://blog.kubernetes.io/2017/09/kubernetes-18-security-workloads-and.html). In this blog post, I’ll walk you through the changes we’ve made to kubeadm since the last update, the scope of kubeadm, and how you can contribute to this effort.
Since its debut in [September 2016](https://kubernetes.io/blog/2016/09/how-we-made-kubernetes-easy-to-install), the Cluster Lifecycle Special Interest Group (SIG) has established kubeadm as the easiest Kubernetes bootstrap method. Now, we’re releasing kubeadm v1.8.0 in tandem with the release of [Kubernetes v1.8.0](https://kubernetes.io/blog/2017/09/kubernetes-18-security-workloads-and). In this blog post, I’ll walk you through the changes we’ve made to kubeadm since the last update, the scope of kubeadm, and how you can contribute to this effort.
## Security first: kubeadm v1.6 & v1.7
Previously, we discussed [planned updates for kubeadm v1.6](http://blog.kubernetes.io/2017/01/stronger-foundation-for-creating-and-managing-kubernetes-clusters.html). Our primary focus for v1.6 was security. We started enforcing role based access control (RBAC) as it graduated to beta, gave unique identities and locked-down privileges for different system components in the cluster, disabled the insecure `localhost:8080` API server port, started authorizing all API calls to the kubelets, and [improved the token discovery](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/cluster-lifecycle/bootstrap-discovery.md) method used formerly in v1.5. Token discovery (aka Bootstrap Tokens) graduated to beta in v1.8.
Previously, we discussed [planned updates for kubeadm v1.6](https://kubernetes.io/blog/2017/01/stronger-foundation-for-creating-and-managing-kubernetes-clusters). Our primary focus for v1.6 was security. We started enforcing role based access control (RBAC) as it graduated to beta, gave unique identities and locked-down privileges for different system components in the cluster, disabled the insecure `localhost:8080` API server port, started authorizing all API calls to the kubelets, and [improved the token discovery](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/cluster-lifecycle/bootstrap-discovery.md) method used formerly in v1.5. Token discovery (aka Bootstrap Tokens) graduated to beta in v1.8.
In number of features, kubeadm v1.7.0 was a much smaller release compared to v1.6.0 and v1.8.0. The main additions were enforcing [the Node Authorizer](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node/kubelet-authorizer.md), which significantly reduces the attack surface for a Kubernetes cluster, and initial, limited upgrading support from v1.6 clusters.