fix spellings and some broken URLs

docs/04-certificate-authority.md

@@ -84,7 +84,7 @@ The `ca.key` is used by the CA for signing certificates. And it should be secure
 
 In this section you will generate client and server certificates for each Kubernetes component and a client certificate for the Kubernetes `admin` user.
 
-To better understand the role of client certificates with respect to users and groups, see [this informative video](https://youtu.be/I-iVrIWfMl8). Note that all the kubenetes services below are themselves cluster users.
+To better understand the role of client certificates with respect to users and groups, see [this informative video](https://youtu.be/I-iVrIWfMl8). Note that all the kubernetes services below are themselves cluster users.
 
 ### The Admin Client Certificate
 

docs/08-bootstrapping-kubernetes-controllers.md

@@ -285,7 +285,7 @@ CONTROL02=$(dig +short controlplane02)
 LOADBALANCER=$(dig +short loadbalancer)
 ```
 
-Create HAProxy configuration to listen on API server port on this host and distribute requests evently to the two controlplane nodes.
+Create HAProxy configuration to listen on API server port on this host and distribute requests evenly to the two controlplane nodes.
 
 We configure it to operate as a [layer 4](https://en.wikipedia.org/wiki/Transport_layer) loadbalancer (using `mode tcp`), which means it forwards any traffic directly to the backends without doing anything like [SSL offloading](https://ssl2buy.com/wiki/ssl-offloading).
 

docs/10-bootstrapping-kubernetes-workers.md

@@ -3,7 +3,7 @@
 In this lab you will bootstrap 2 Kubernetes worker nodes. We already installed `containerd` and its dependencies on these nodes in the previous lab.
 
 We will now install the kubernetes components
-- [kubelet](https://kubernetes.io/docs/admin/kubelet)
+- [kubelet](https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/)
 - [kube-proxy](https://kubernetes.io/docs/concepts/cluster-administration/proxies).
 
 ## Prerequisites
@@ -13,7 +13,7 @@ Once this is done, the commands are to be run on first worker instance: `node01`
 
 ### Provisioning Kubelet Client Certificates
 
-Kubernetes uses a [special-purpose authorization mode](https://kubernetes.io/docs/admin/authorization/node/) called Node Authorizer, that specifically authorizes API requests made by [Kubelets](https://kubernetes.io/docs/concepts/overview/components/#kubelet). In order to be authorized by the Node Authorizer, Kubelets must use a credential that identifies them as being in the `system:nodes` group, with a username of `system:node:<nodeName>`. In this section you will create a certificate for each Kubernetes worker node that meets the Node Authorizer requirements.
+Kubernetes uses a special-purpose authorization mode called [Node Authorizer](https://kubernetes.io/docs/reference/access-authn-authz/node/), that specifically authorizes API requests made by [Kubelets](https://kubernetes.io/docs/concepts/overview/components/#kubelet). In order to be authorized by the Node Authorizer, Kubelets must use a credential that identifies them as being in the `system:nodes` group, with a username of `system:node:<nodeName>`. In this section you will create a certificate for each Kubernetes worker node that meets the Node Authorizer requirements.
 
 Generate a certificate and private key for one worker node:
 
@@ -54,7 +54,7 @@ node01.crt
 
 ### The kubelet Kubernetes Configuration File
 
-When generating kubeconfig files for Kubelets the client certificate matching the Kubelet's node name must be used. This will ensure Kubelets are properly authorized by the Kubernetes [Node Authorizer](https://kubernetes.io/docs/admin/authorization/node/).
+When generating kubeconfig files for Kubelets the client certificate matching the Kubelet's node name must be used. This will ensure Kubelets are properly authorized by the Kubernetes [Node Authorizer](https://kubernetes.io/docs/reference/access-authn-authz/node/).
 
 Get the kube-api server load-balancer IP.
 

vagrant/Vagrantfile

@@ -5,7 +5,7 @@
 # Larger nodes will be created if you have more.
 RAM_SIZE = 16
 
-# Define how mnay CPU cores you have.
+# Define how many CPU cores you have.
 # More powerful workers will be created if you have more
 CPU_CORES = 8