Setup of Jenkins Docker container

Rani Gupta

5 min readJul 9, 2020

Mlops ❗Task-2❗

Task Description 👉

Create container image that’s has Jenkins installed using dockerfile

2. When we launch this image, it should automatically starts Jenkins service in the container.

3. Create a job chain of job1, job2, job3 and job4 using build pipeline plugin in Jenkins

4. Job1 : Pull the Github repo automatically when some developers push repo to Github.

5. Job2 : By looking at the code or program file, Jenkins should automatically start the respective language interpreter install image container to deploy code ( eg. If code is of PHP, then Jenkins should start the container that has PHP already installed ).

6. Job3 : Test your app if it is working or not.

7. Job4 : if app is not working , then send email to developer with error messages.

8. Create One extra job job5 for monitor : If container where app is running. fails due to any reason then this job should automatically start the container again.

Let see the procedure :

Github :

make a blank repo on github and push a html page on it using git bash (offline)

Git :

either manually push or create hooks to automatically push the code using git hooks

cd  .git/hooks
notepad post-commit
[inside it just write : 
#!/bin/bash
git push
echo "done"]
mv post-commit.txt post-commit

Docker :

firstly do check these :

systemctl start docker
systemctl status docker → (must be Active)
setenforce 0
systemctl start httpd

firstly make a directory on /

mkdir /proj2
cd /proj2
gedit Dockerfile

Docker setup for handling request over Tcp protocol :

firstly we connect client network to the outside world known as socket networking.

vim  /usr/lib/systemd/system/docker.service

add this line :

-H tcp:// <your rhel8 ip>:<any port no.>
# but ususally we give port no. -> 4243

# important commands compulsory to perform :
systemctl  daemon-reload
systemctl restart docker

as we have changed the services so must reload daemon to apply changes and restart the docker . we have done this so that our outside system (in our case jenkins )can connect to base system docker and recognise its commands . and Run this also,

— > export DOCKER_HOST=192.168.43.72:4243

Build the Jenkins image :

here, in my case i have used image name (ownimage) and version (v1)

docker build -t <image name>:<version>

Launching docker container (Run the Docker image) :

docker run -dit -p 8085:8080 --name os ownimage:v1

here, 8085 is my port no. where i exposed my jenkins and os is the container name , as you run this it give a id that is containers running id

To access the jenkins login page we have used redhat ip:port no.(exposed)

For password go inside the container by the ‘exec ‘ & Run command:

docker exec os cat /var/lib/jenkins/.jenkins/secrets/initialAdminPassword

Alternative for Establishing socket networking:

directly run command ->

Jenkins :

make a blank directory inside the container, i named it task2:(in my case i applied sudo before every command because i don’t provide root access permission )