Category: kubernetes

Install Minikube in Ubuntu

Posted on March 10, 2019 (April 7, 2019) by ServerOk

Minikube is an easy to use Kubernetes that run on one machine. It is used for testing purpose. https://github.com/kubernetes/minikube To install minikube, run

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

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 command

sudo apt install virtualbox

1	sudo apt install virtualbox

To start minikube, run

minikube start

1	minikube start

To stop

minikube stop

1	minikube stop

To connect to minikube node

minikube ssh

1	minikube ssh

[…]

Deploy MySQL Server in Kubernetes using Helm

Posted on February 26, 2019 (February 26, 2019) by ServerOk

To install MySQL server in Kubernetes, run

helm install stable/mysql

1	helm install stable/mysql

Once install is completed, you will get something like

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}

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

kubectl run -i --tty ubuntu --image=ubuntu:18.04 --restart=Never -- bash -il

1	kubectl run -i --tty ubuntu --image=ubuntu:18.04 --restart=Never -- bash -il

Install MySQL client inside this server with

apt update
apt install mariadb-client -y

1 2	apt update apt install mariadb-client -y

[…]

Install WordPress in Kubernetes

Posted on February 26, 2019 by ServerOk

To install WordPress in Kubernetes, you need to install helm package manager. Now run

helm install stable/wordpress

1	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

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:~$

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

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:~$

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

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:~$

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

boby@sok-01:~$ kubectl scale deployment/whopping-labradoodle-wordpress --replicas=2
deployment.extensions/whopping-labradoodle-wordpress scaled
boby@sok-01:~$

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 Kubernetes Package Manager

Posted on February 26, 2019 (February 28, 2019) by ServerOk

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

curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get > get_helm.sh
bash get_helm.sh

1 2	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

snap install helm --classic

1	snap install helm --classic

To update helm repos, run

helm repo update

1	helm repo update

To deploy MySQL chart to Kubernetes, run

helm install stable/mysql

1	helm install stable/mysql

Install WordPress in […]

Google Kubernetes Engine

Posted on February 24, 2019 (March 10, 2019) by ServerOk

To list all Kubernetes clusters, run

gcloud container clusters list

1	gcloud container clusters list

To create a Kubernetes cluster, run

gcloud container clusters create CLUSTER_NAME

1	gcloud container clusters create CLUSTER_NAME

Get credential for kubectl

gcloud container clusters get-credentials CLUSTER_NAME

1	gcloud container clusters get-credentials CLUSTER_NAME

List all nodes (GCP instances)

kubectl get nodes

1	kubectl get nodes

Create Kubernetes cluser using gcloud […]