Minikube is a Kubernetes implementation for development and testing. By default, it uses Virtualbox. The newer version support docker driver, this allows you to use docker to run your minikube Kubernetes cluster. You can find documentation for minikube at https://minikube.sigs.k8s.io/docs/start/ First of all, we need to install Docker, for this, run the command. You must […]
In Google Kubernetes Engine, Nodes are Google Complete Engine (Virtual Machiens). Pods run inside Nodes. A Kubernetes cluster can contain multiple node pools. A node pool contain multiple nodes of same instance type. To create a Node Pool in Google Kubernetes Engine, run
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gcloud container node-pools create POOL_NAME \ --cluster=CLUSER_NAME \ --machine-type=e2-standard-2 \ --num-nodes=1 \ --zone=ZONE_NAME |
To delete a node pool, run
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gcloud container node-pools delete POOL_NAME --cluster CLUSER_NAME --zone ZONE_NAME |
To resize a node […]
Minikube is an easy-to-use Kubernetes that run on one machine. It is used for testing purposes. https://github.com/kubernetes/minikube Install Minikube with docker driver on Ubuntu To install minikube, run
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wget https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 sudo mv minikube-linux-amd64 /usr/local/bin/minikube sudo chmod 755 /usr/local/bin/minikube |
Before you can start minikube, you need to install VirtualBox, this can be done with the command
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sudo apt install virtualbox |
To start minikube, run
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minikube start |
To stop
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minikube stop |
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To install MySQL server in Kubernetes, run
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helm install stable/mysql |
Once install is completed, you will get something like
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NOTES: MySQL can be accessed via port 3306 on the following DNS name from within your cluster: incendiary-monkey-mysql.default.svc.cluster.local To get your root password run: MYSQL_ROOT_PASSWORD=$(kubectl get secret --namespace default incendiary-monkey-mysql -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo) To connect to your database: 1. Run an Ubuntu pod that you can use as a client: kubectl run -i --tty ubuntu --image=ubuntu:16.04 --restart=Never -- bash -il 2. Install the mysql client: $ apt-get update && apt-get install mysql-client -y 3. Connect using the mysql cli, then provide your password: $ mysql -h incendiary-monkey-mysql -p To connect to your database directly from outside the K8s cluster: MYSQL_HOST=127.0.0.1 MYSQL_PORT=3306 # Execute the following command to route the connection: kubectl port-forward svc/incendiary-monkey-mysql 3306 mysql -h ${MYSQL_HOST} -P${MYSQL_PORT} -u root -p${MYSQL_ROOT_PASSWORD} |
To connect to this MySQL, you need to create a temporary Ubuntu server in Kubernetes as MySQL is only available inside the cluster. To create a server, run
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kubectl run -i --tty ubuntu --image=ubuntu:18.04 --restart=Never -- bash -il |
Install MySQL client inside this server with
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apt update apt install mariadb-client -y |
[…]
To install WordPress in Kubernetes, you need to install helm package manager. Now run
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helm install stable/wordpress |
After the helm chart is run, you will get commands to get login for WordPress admin area. Here is services it create
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boby@sok-01:~$ kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.39.240.1 <none> 443/TCP 34m whopping-labradoodle-mariadb ClusterIP 10.39.248.140 <none> 3306/TCP 2m whopping-labradoodle-wordpress LoadBalancer 10.39.253.160 35.193.33.14 80:32054/TCP,443:30939/TCP 2m boby@sok-01:~$ |
List of all pods
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boby@sok-01:~$ kubectl get pod NAME READY STATUS RESTARTS AGE ubuntu 0/1 Completed 0 21m whopping-labradoodle-mariadb-0 1/1 Running 0 3m whopping-labradoodle-wordpress-8bddb5fdf-2l24d 1/1 Running 0 3m boby@sok-01:~$ |
Deployments
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boby@sok-01:~$ kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE whopping-labradoodle-wordpress 1 1 1 1 4m boby@sok-01:~$ |
To scale the deployment, run
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boby@sok-01:~$ kubectl scale deployment/whopping-labradoodle-wordpress --replicas=2 deployment.extensions/whopping-labradoodle-wordpress scaled boby@sok-01:~$ |
See Helm Kubernetes Package […]
Helm is Package Manager for Kubernetes. Helm packages are called “Charts”. Charts allow you to deploy various software on Kubernetes cluster. https://helm.sh/ To install helm, run
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curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get > get_helm.sh bash get_helm.sh |
If you are on Ubuntu, you can install from snap
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snap install helm --classic |
To update helm repos, run
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helm repo update |
To deploy MySQL chart to Kubernetes, run
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helm install stable/mysql |
Install WordPress in […]
Create Kubernetes cluser using gcloud Google Kubernetes Engine get credentials Google Kubernetes Engine Node Pools To list all Kubernetes clusters, run
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gcloud container clusters list |
To create a Kubernetes cluster, run
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gcloud container clusters create CLUSTER_NAME |
Get credential for kubectl
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gcloud container clusters get-credentials CLUSTER_NAME |
List all nodes (GCP instances)
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kubectl get nodes |
[…]