Replace redirect links of kubeadm

/docs/reference/setup-tools/kubeadm/kubeadm/ is redirected to
/docs/reference/setup-tools/kubeadm/
This replaces the redirect links of kubeadm with the direct links.

Author: Kenichi Omichi

content/en/blog/_posts/2018-08-03-make-kubernetes-production-grade-anywhere.md

@@ -176,7 +176,7 @@ Cluster-distributed stateful services (e.g., Cassandra) can benefit from splitti
 
 [Logs](/docs/concepts/cluster-administration/logging/) and [metrics](/docs/tasks/debug-application-cluster/resource-usage-monitoring/) (if collected and persistently retained) are valuable to diagnose outages, but given the variety of technologies available it will not be addressed in this blog. If Internet connectivity is available, it may be desirable to retain logs and metrics externally at a central location.
 
-Your production deployment should utilize an automated installation, configuration and update tool (e.g., [Ansible](https://github.com/kubernetes-incubator/kubespray), [BOSH](https://github.com/cloudfoundry-incubator/kubo-deployment), [Chef](https://github.com/chef-cookbooks/kubernetes), [Juju](/docs/getting-started-guides/ubuntu/installation/), [kubeadm](/docs/reference/setup-tools/kubeadm/kubeadm/), [Puppet](https://forge.puppet.com/puppetlabs/kubernetes), etc.). A manual process will have repeatability issues, be labor intensive, error prone, and difficult to scale. [Certified distributions](https://www.cncf.io/certification/software-conformance/#logos) are likely to include a facility for retaining configuration settings across updates, but if you implement your own install and config toolchain, then retention, backup and recovery of the configuration artifacts is essential. Consider keeping your deployment components and settings under a version control system such as Git.
+Your production deployment should utilize an automated installation, configuration and update tool (e.g., [Ansible](https://github.com/kubernetes-incubator/kubespray), [BOSH](https://github.com/cloudfoundry-incubator/kubo-deployment), [Chef](https://github.com/chef-cookbooks/kubernetes), [Juju](/docs/getting-started-guides/ubuntu/installation/), [kubeadm](/docs/reference/setup-tools/kubeadm/), [Puppet](https://forge.puppet.com/puppetlabs/kubernetes), etc.). A manual process will have repeatability issues, be labor intensive, error prone, and difficult to scale. [Certified distributions](https://www.cncf.io/certification/software-conformance/#logos) are likely to include a facility for retaining configuration settings across updates, but if you implement your own install and config toolchain, then retention, backup and recovery of the configuration artifacts is essential. Consider keeping your deployment components and settings under a version control system such as Git.
 
 ## Outage recovery
 

content/en/blog/_posts/2018-12-03-kubernetes-1-13-release-announcement.md

@@ -17,7 +17,7 @@ Let’s dive into the key features of this release:
 
 ## Simplified Kubernetes Cluster Management with kubeadm in GA
 
-Most people who have gotten hands-on with Kubernetes have at some point been hands-on with kubeadm. It's an essential tool for managing the cluster lifecycle, from creation to configuration to upgrade; and now kubeadm is officially GA. [kubeadm](/docs/reference/setup-tools/kubeadm/kubeadm/) handles the bootstrapping of production clusters on existing hardware and configuring the core Kubernetes components in a best-practice-manner to providing a secure yet easy joining flow for new nodes and supporting easy upgrades. What’s notable about this GA release are the now graduated advanced features, specifically around pluggability and configurability. The scope of kubeadm is to be a toolbox for both admins and automated, higher-level system and this release is a significant step in that direction.
+Most people who have gotten hands-on with Kubernetes have at some point been hands-on with kubeadm. It's an essential tool for managing the cluster lifecycle, from creation to configuration to upgrade; and now kubeadm is officially GA. [kubeadm](/docs/reference/setup-tools/kubeadm/) handles the bootstrapping of production clusters on existing hardware and configuring the core Kubernetes components in a best-practice-manner to providing a secure yet easy joining flow for new nodes and supporting easy upgrades. What’s notable about this GA release are the now graduated advanced features, specifically around pluggability and configurability. The scope of kubeadm is to be a toolbox for both admins and automated, higher-level system and this release is a significant step in that direction.
 
 ## Container Storage Interface (CSI) Goes GA
 

content/en/docs/setup/best-practices/certificates.md

@@ -9,7 +9,7 @@ weight: 40
 <!-- overview -->
 
 Kubernetes requires PKI certificates for authentication over TLS.
-If you install Kubernetes with [kubeadm](/docs/reference/setup-tools/kubeadm/kubeadm/), the certificates that your cluster requires are automatically generated.
+If you install Kubernetes with [kubeadm](/docs/reference/setup-tools/kubeadm/), the certificates that your cluster requires are automatically generated.
 You can also generate your own certificates -- for example, to keep your private keys more secure by not storing them on the API server.
 This page explains the certificates that your cluster requires.
 
@@ -74,7 +74,7 @@ Required certificates:
 | kube-apiserver-kubelet-client | kubernetes-ca             | system:masters | client                                 |                                             |
 | front-proxy-client            | kubernetes-front-proxy-ca |                | client                                 |                                             |
 
-[1]: any other IP or DNS name you contact your cluster on (as used by [kubeadm](/docs/reference/setup-tools/kubeadm/kubeadm/)
+[1]: any other IP or DNS name you contact your cluster on (as used by [kubeadm](/docs/reference/setup-tools/kubeadm/)
 the load balancer stable IP and/or DNS name, `kubernetes`, `kubernetes.default`, `kubernetes.default.svc`,
 `kubernetes.default.svc.cluster`, `kubernetes.default.svc.cluster.local`)
 
@@ -100,7 +100,7 @@ For kubeadm users only:
 
 ### Certificate paths
 
-Certificates should be placed in a recommended path (as used by [kubeadm](/docs/reference/setup-tools/kubeadm/kubeadm/)).
+Certificates should be placed in a recommended path (as used by [kubeadm](/docs/reference/setup-tools/kubeadm/)).
 Paths should be specified using the given argument regardless of location.
 
 | Default CN                   | recommended key path         | recommended cert path       | command        | key argument                 | cert argument                             |

content/en/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm.md

@@ -137,7 +137,7 @@ is not supported by kubeadm.
 
 ### More information
 
-For more information about `kubeadm init` arguments, see the [kubeadm reference guide](/docs/reference/setup-tools/kubeadm/kubeadm/).
+For more information about `kubeadm init` arguments, see the [kubeadm reference guide](/docs/reference/setup-tools/kubeadm/).
 
 To configure `kubeadm init` with a configuration file see [Using kubeadm init with a configuration file](/docs/reference/setup-tools/kubeadm/kubeadm-init/#config-file).
 

content/en/docs/setup/production-environment/tools/kubespray.md

@@ -23,7 +23,7 @@ Kubespray is a composition of [Ansible](https://docs.ansible.com/) playbooks, [i
 * continuous integration tests
 
 To choose a tool which best fits your use case, read [this comparison](https://github.com/kubernetes-sigs/kubespray/blob/master/docs/comparisons.md) to
-[kubeadm](/docs/reference/setup-tools/kubeadm/kubeadm/) and [kops](/docs/setup/production-environment/tools/kops/).
+[kubeadm](/docs/reference/setup-tools/kubeadm/) and [kops](/docs/setup/production-environment/tools/kops/).
 
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