80-jenkins.sh

# Source: https://gist.github.com/b0a32051da5ae3dea09e596689d7cf24

#################################
# Running Jenkins In Kubernetes #
# Tutorial And Review           #
# https://youtu.be/2Kc3fUJANAc  #
#################################

# Referenced videos:
# - GitHub CLI - How to manage repositories more efficiently: https://youtu.be/BII6ZY2Rnlc
# - Kaniko - Building Container Images In Kubernetes Without Docker: https://youtu.be/EgwVQN6GNJg
# - Kustomize - How to Simplify Kubernetes Configuration Management: https://youtu.be/Twtbg6LFnAg

#########
# Setup #
#########

# Create a Kubernetes cluster with NGINX Ingress

gh repo fork vfarcic/jenkins-demo \
    --clone

cd jenkins-demo

# If NOT EKS
export INGRESS_HOST=$(kubectl \
    --namespace ingress-nginx \
    get svc ingress-nginx-controller \
    --output jsonpath="{.status.loadBalancer.ingress[0].ip}")

# If EKS
export INGRESS_HOSTNAME=$(kubectl \
    --namespace ingress-nginx \
    get svc ingress-nginx-controller \
    --output jsonpath="{.status.loadBalancer.ingress[0].hostname}")

# If EKS
export INGRESS_HOST=$(\
    dig +short $INGRESS_HOSTNAME)

echo $INGRESS_HOST

# Repeat the `export` commands if the output is empty

# If the output contains more than one IP, wait for a while longer, and repeat the `export` commands.

# If the output continues having more than one IP, choose one of them and execute `export INGRESS_HOST=[...]` with `[...]` being the selected IP.

export REGISTRY_SERVER=https://index.docker.io/v1/

# Replace `[...]` with the registry username
export REGISTRY_USER=[...]

# Replace `[...]` with the registry password
export REGISTRY_PASS=[...]

# Replace `[...]` with the registry email
export REGISTRY_EMAIL=[...]

cat kustomize/base/ingress.yaml \
    | sed -e "[email protected]@jenkins-demo.$INGRESS_HOST.nip.io@g" \
    | tee kustomize/overlays/production/ingress.yaml

cat kustomize/base/ingress.yaml \
    | sed -e "[email protected]@jenkins-demo.$INGRESS_HOST.nip.io@g" \
    | tee kustomize/overlays/preview/ingress.yaml

cat Jenkinsfile \
    | sed -e "s@vfarcic@$REGISTRY_USER@g" \
    | sed -e "[email protected]@$INGRESS_HOST.nip.io@g" \
    | tee Jenkinsfile

cat jenkins-values.yaml \
    | sed -e "s@hostName: .*@hostName: jenkins.$INGRESS_HOST.nip.io@g" \
    | tee jenkins-values.yaml

kubectl create namespace production

kubectl create namespace previews

######################
# Installing Jenkins #
######################

pwd

helm repo add jenkinsci https://charts.jenkins.io

helm repo update

gh repo view jenkinsci/helm-charts --web

cat jenkins-values.yaml

helm upgrade --install \
    jenkins jenkinsci/jenkins \
    --namespace jenkins \
    --create-namespace \
    --values jenkins-values.yaml \
    --wait

#########################
# Creating Jenkins jobs #
#########################

echo http://jenkins.$INGRESS_HOST.nip.io

# Open it in browser

kubectl --namespace jenkins \
    get secret jenkins \
    --output jsonpath="{.data.jenkins-admin-password}" \
    | base64 --decode && echo

#########################
# Exploring Jenkinsfile #
#########################

cat Jenkinsfile

#########################
# Exploring PodTemplate #
#########################

cat jenkins-pod.yaml

kubectl --namespace jenkins \
    create secret \
    docker-registry regcred \
    --docker-server $REGISTRY_SERVER \
    --docker-username $REGISTRY_USER \
    --docker-password $REGISTRY_PASS \
    --docker-email $REGISTRY_EMAIL

##################################
# Defining roles and permissions #
##################################

cat roles.yaml

kubectl apply --filename roles.yaml

############################
# Creating GitHub webhooks #
############################

gh repo view --web

echo http://jenkins.$INGRESS_HOST.nip.io/github-webhook/

# Copy and paste the address into the webhook *Payload URL* field

###########################
# Creating a pull request #
###########################

git checkout -b my-feature

# Open config.toml and change something

git add .

git commit -m "Is this a new feature?"

git push --set-upstream origin my-feature

gh pr create \
    --title "My feature" \
    --body "I'm too lazy to write descriptions"

#####################
# Building mainline #
#####################

gh repo view --web

# Navigate to the PR and merge it.

git checkout master

git pull

echo http://jenkins-demo.$INGRESS_HOST.nip.io

# Open it