k8s 1.21 has reach end-of-life (#295)

k8s 1.21 has reached end of life and knative now requires k8s 1.22 and
above. This commit updates the minimum k8s and knative requirements to
reflect this change

Author: Sameer Naik

docs/guides/installation-helm.md

@@ -13,9 +13,9 @@ $ helm install -n triggermesh triggermesh triggermesh/triggermesh --create-names
 ```
 
 ## Prerequisites
-  - Kubernetes 1.21+
+  - Kubernetes 1.22+
   - Helm 3.0+
-  - Knative v1.0.0+
+  - Knative v1.4.0+
 
 ## Installing the Chart
 

docs/guides/installation-tce.md

@@ -7,7 +7,7 @@
 
 ## Installation
 
-This guide walks you through the deployment of Knative version 1.0.0 [using YAML files](https://knative.dev/docs/admin/install/serving/install-serving-with-yaml/). Please refer to the upstream Knative [documentation](https://knative.dev/docs/install/) for other deployment options.
+This guide walks you through the deployment of Knative version 1.4.0 [using YAML files](https://knative.dev/docs/admin/install/serving/install-serving-with-yaml/). Please refer to the upstream Knative [documentation](https://knative.dev/docs/install/) for other deployment options.
 
 1. Follow the [Getting Started with Tanzu Community Edition](https://tanzucommunityedition.io/docs/latest/getting-started-standalone/) installation instructions and create your Tanzu cluster on your platform of choice.
 
@@ -20,8 +20,8 @@ kubectl config use-context <STANDALONE-CLUSTER-NAME>-admin@<STANDALONE-CLUSTER-N
 1. Install Knative Serving following the [Installing Knative Serving using YAML files](https://knative.dev/docs/admin/install/serving/install-serving-with-yaml/) instructions.
 
 ```bash
-kubectl apply -f https://github.com/knative/serving/releases/download/knative-v1.0.2/serving-crds.yaml
-kubectl apply -f https://github.com/knative/serving/releases/download/knative-v1.0.2/serving-core.yaml
+kubectl apply -f https://github.com/knative/serving/releases/download/knative-v1.4.0/serving-crds.yaml
+kubectl apply -f https://github.com/knative/serving/releases/download/knative-v1.4.0/serving-core.yaml
 ```
 
 1. Wait until the pods have started before proceeding.
@@ -33,8 +33,8 @@ kubectl get pods -n knative-serving
 1. The version of Contour provided with the Tanzu Community Edition package repository is older than the version of `knative-serving` we have installed, so install it from YAML as well.
 
 ```bash
-kubectl apply -f https://github.com/knative-sandbox/net-contour/releases/download/knative-v1.0.0/contour.yaml
-kubectl apply -f https://github.com/knative-sandbox/net-contour/releases/download/knative-v1.0.0/net-contour.yaml
+kubectl apply -f https://github.com/knative-sandbox/net-contour/releases/download/knative-v1.4.0/contour.yaml
+kubectl apply -f https://github.com/knative-sandbox/net-contour/releases/download/knative-v1.4.0/net-contour.yaml
 ```
 
 1. Verify the pods have started before proceeding.
@@ -64,8 +64,8 @@ kubectl --namespace contour-external get service envoy
 1. Install Knative Eventing following the [Installing Knative Eventing using YAML files](https://knative.dev/docs/admin/install/eventing/install-eventing-with-yaml/) instructions.
 
 ```bash
-kubectl apply -f https://github.com/knative/eventing/releases/download/knative-v1.0.3/eventing-crds.yaml
-kubectl apply -f https://github.com/knative/eventing/releases/download/knative-v1.0.3/eventing-core.yaml
+kubectl apply -f https://github.com/knative/eventing/releases/download/knative-v1.4.2/eventing-crds.yaml
+kubectl apply -f https://github.com/knative/eventing/releases/download/knative-v1.4.2/eventing-core.yaml
 ```
 
 1. Verify your installation.

docs/guides/installation.md

@@ -18,8 +18,8 @@ These four steps are highlighted below. The first two steps (i.e Access to a Kub
 
 The Knative project is a dependency of TriggerMesh, install it using the instructions in the [Knative documentation](https://knative.dev/docs/admin/install/)
 
-* A Kubernetes cluster version `v1.21+`
-* Knative `v1.0.0+`
+* A Kubernetes cluster version `v1.22+`
+* Knative `v1.4.0+`
 
 If you are using VMware's [Tanzu Community Edition](https://tanzucommunityedition.io/), please refer to the [Installation for Tanzu Community Edition](installation-tce.md).