Simple script to deploy cert-manager in Kubernetes using Let's Encrypt

lets-encrypt.sh

#!/bin/bash

# Email for Let's Encrypt account
EMAIL="foo@example.com"

# Install the CustomResourceDefinition resources separately
kubectl apply -f https://raw.githubusercontent.com/jetstack/cert-manager/release-0.6/deploy/manifests/00-crds.yaml

# Create the namespace for cert-manager
kubectl create namespace cert-manager

# Label the cert-manager namespace to disable resource validation
kubectl label namespace cert-manager certmanager.k8s.io/disable-validation=true

# Install Issuers
# One Issuer and one ClusterIssuer shown
cat <<EOF | kubectl create -f -
---
apiVersion: certmanager.k8s.io/v1alpha1
kind: Issuer
metadata:
  name: letsencrypt-staging
spec:
  acme:
    # The ACME server URL
    server: https://acme-staging.api.letsencrypt.org/directory
    # Email address used for ACME registration
    email: "$EMAIL"
    # Name of a secret used to store the ACME account private key
    privateKeySecretRef:
      name: letsencrypt-staging
    # Enable the HTTP-01 challenge provider
    http01: {}

---
apiVersion: certmanager.k8s.io/v1alpha1
kind: ClusterIssuer
metadata:
  name: letsencrypt-production
spec:
  acme:
    # The ACME production api URL
    server: https://acme-v02.api.letsencrypt.org/directory
    # Email address used for ACME registration
    email: "$EMAIL"
    # Name of a secret used to store the ACME account private key
    privateKeySecretRef:
      name: letsencrypt-production
    # Enable the HTTP-01 challenge provider
    http01: {}
EOF

# Update your local Helm chart repository cache
helm repo update

# Install the cert-manager Helm chart
# Shown with Production ClusterIssue 
helm upgrade --install \
  --namespace cert-manager \
  --set resources.requests.cpu=10m \
  --set resources.requests.memory=32Mi \
  --set resources.limits.cpu=100m \
  --set resources.limits.memory=128Mi \
  --set ingressShim.defaultIssuerName="letsencrypt-production" \
  --set ingressShim.defaultIssuerKind="ClusterIssuer" \
  cert-manager stable/cert-manager