Upgrading Task 2 with Kubernetes

Skabhi

3 min readJun 21, 2020

Task2:

Integrating the Git, Jenkins, Docker for automation

In this task, I have integrated the Docker with Jenkins and Git for continuous integration.

medium.com

For this task, we have minikube installed in any O.S in a Virtual Machine.
I am using my ubuntu linux for doing this task.

First start your minikube .

2. Create a Jenkins image with kubectl installed on it.

FROM centos:


RUN yum install wget -y
RUN yum install net-tools -y
RUN wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins.io/redhat/jenkins.repo
RUN rpm --import http://pkg.jenkins.io/redhat/jenkins.io.key
RUN yum install java -y
RUN yum install jenkins -y
RUN yum install git -y
RUN yum install python36 -y

RUN sed 's/JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true"/JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Dmail.smtp.starttls.enable=true -Dmail.smtp.ssl.protocols=TLSv1.2"/g' /etc/sysconfig/jenkins

RUN touch /etc/yum.repos.d/kubernetes.repo
RUN echo $'[kubernetes]\n\
name=Kubernetes\n\
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64\n\
enabled=1\n\
gpgcheck=1\n\
repo_gpgcheck=1\n\
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg' >> /etc/yum.repos.d/kubernetes.repo

RUN yum install -y kubectl

EXPOSE 8080
CMD java -jar /usr/lib/jenkins/jenkins.war

Build your image using

docker build -t skabhi003/jenkin-kubectl:v1 .

Run the container, and complete your login setup of Jenkins.

docker run -it -v /root/w1/:/root/.kube -p 9000:8080 skabhi003/jenkin-kubectl:v1

Here my “root/w1/” contains :

> ca.crt
> client.crt
> client.key
> config
> my.py

Now our kubectl are completely configured and can run our commands on minikube.

Copy the marked password .

Paste the above copied password into adminstrator password.

Now we will going to create our jobs.

Job1 will remain same as was in previous task.
In Job2 , go to Execute shell and paste this commands:

export len1=$(ls /root/workspace | grep html | wc -l)
if [ $len1 -gt 0 ]
then 
export len2=$(kubectl get deployments | grep webserver | wc -l)
if [ $len2 -gt 0 ]
then
kubectl delete deployment webserver
fi
export len3=$(kubectl get svc | grep webserver | wc -l)
if [ $len3 -gt 0 ]
then
kubectl delete svc webserver
fi
kubectl create deployment webserver --image=httpd
kubectl scale deployment webserver --replicas=3
kubectl expose deployment webserver --port=80 --type=NodePort
sleep 30
python3 /root/my.py
kubectl get svc
fi

Here “my.py” contains:

#!/usr/bin/python3
import os
cmd = os.popen("kubectl get pods | grep webserver")
cmd_op = cmd.read()
x = cmd_op.split('\n')
del x[-1]
for y in x:
    z = y.split()
    print(z)
    os.system("kubectl cp /root/workspace/:/usr/local/apache2/htdocs/".format(z[0]))

3. Job3: I am leaving job3 as it is to send mail to developer if Job2 fails.

4. Here we don’t need any monitoring job as this will be handled by the Kubernetes itself.