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Helm - Example - Install bitnami/mysql

Prerequisites

  • kubectl needs to be installed and configured to access cluster
  • Good: helm works as unprivileged user as well - Good for our setup
  • install helm on ubuntu (client) as root: snap install --classic helm
    • this installs helm3
  • Please only use: helm3. No server-side components needed (in cluster)
    • Get away from examples using helm2 (hint: helm init) - uses tiller

Simple Walkthrough (Example 0)

# Repo hinzufpgen 
helm repo add bitnami https://charts.bitnami.com/bitnami 
# gecachte Informationen aktualieren 
helm repo update

helm search repo bitnami 
# helm install release-name bitnami/mysql
helm install my-mysql bitnami/mysql
# Chart runterziehen ohne installieren 
# helm pull bitnami/mysql

# Release anzeigen zu lassen
helm list 

# Status einer Release / Achtung, heisst nicht unbedingt nicht, dass pod läuft 
helm status my-mysql 

# weitere release installieren 
# helm install neuer-release-name  bitnami/mysql

Under the hood

# Helm speichert Informationen über die Releases in den Secrets
kubectl get secrets | grep helm

Example 1: - To get know the structure

helm repo add bitnami https://charts.bitnami.com/bitnami 
helm search repo bitnami 
helm repo update
helm pull bitnami/mysql 
tar xzvf mysql-9.0.0.tgz

Example 2: We will setup mysql without persistent storage (not helpful in production ;o()

helm repo add bitnami https://charts.bitnami.com/bitnami 
helm search repo bitnami 
helm repo update

helm install my-mysql bitnami/mysql

Example 2 - continue - fehlerbehebung

helm uninstall my-mysql 
# Install with persistentStorage disabled - Setting a specific value 
helm install my-mysql --set primary.persistence.enabled=false bitnami/mysql

# just as notice 
# helm uninstall my-mysql

Example 2b: using a values file

# mkdir helm-mysql
# cd helm-mysql
# vi values.yml 
primary:
  persistence:
    enabled: false 

helm uninstall my-mysql
helm install my-mysql bitnami/mysql -f values.yml

Example 3: Install wordpress

helm repo add bitnami https://charts.bitnami.com/bitnami 
helm install my-wordpress \
  --set wordpressUsername=admin \
  --set wordpressPassword=password \
  --set mariadb.auth.rootPassword=secretpassword \
    bitnami/wordpress

Example 4: Install Wordpress with values and auth


# mkdir helm-mysql
# cd helm-mysql
# vi values.yml
persistence:
  enabled: false



wordpressUsername: admin
wordpressPassword: password
mariadb:
  primary:
    persistence:
      enabled: false

  auth:
    rootPassword: secretpassword



helm uninstall my-wordpress 
helm install my-wordpress bitnami/wordpress -f values

Referenced