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cert manager installation steps changes (#2239) 

* cert manager installation changes

* change cert manager installation steps
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Murugappan Chetty 2020-04-10 10:49:06 -07:00 committed by GitHub
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docs/serving/installing-cert-manager.md
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@ -34,42 +34,9 @@ You must meet the following requirements to install cert-manager for Knative:
Use the following steps to download, install, and configure cert-manager for
your Knative cluster environment:
1. Run the following commands to download and extract the `cert-manager`
installation package:
1. Follow the steps in the official `cert-manager` website to download and install cert-manager
```shell
CERT_MANAGER_VERSION=0.6.1
DOWNLOAD_URL=https://github.com/jetstack/cert-manager/archive/v${CERT_MANAGER_VERSION}.tar.gz
wget $DOWNLOAD_URL
tar xzf v${CERT_MANAGER_VERSION}.tar.gz
cd cert-manager-${CERT_MANAGER_VERSION}
```
1. Run the following commands to install cert-manager:
1. Install the cert-manager CRDs:
```shell
kubectl apply -f deploy/manifests/00-crds.yaml
```
1. Run one of the following commands to install the cert-manager plugin:
- For Knative clusters running Kubernetes version 1.13 or above:
```shell
# If you are running cluster version 1.13 or above
kubectl apply -f deploy/manifests/cert-manager.yaml
```
- For Knative clusters running Kubernetes version 1.12 or below:
```shell
# If you are running cluster version 1.12 or below, you must append the --validate=false flag
kubectl apply -f deploy/manifests/cert-manager.yaml --validate=false
```
[Installation steps](https://cert-manager.io/docs/installation/kubernetes/)
1. Configure which DNS provider is used to validate the DNS-01 challenge
requests.