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Simply Jenkins is an automation server . Which means any activity which we want we can use Jenkins to automate it . Automation server’s is something with which we can continuously integrate and continuous deliver . We will learn how to integrate Jenkins with Git ,Maven ,Docker, AWS ,Ansible etc

Become a DevOps Master learning Jenkins & integrations with powerful tools like Docker, Ansible, AWS, GIT & more!

create a Linux VM because we will simulate a real world environment. go ahead and Install VirtualBox if you are using Windows. https://www.virtualbox.org/wiki/Downloads.

Create VM using Virtual Machines using Virtual box in Windows to create real world scenarios .

download centos minimal iso file or Redhat minimal iso file .

Create VM using downloaded ISO file in Oracle VM Virtual box. Configure network , Ethernet and etc then our VM is ready .

Jenkins not coming up in the Docker Container ?

There’s a chance that your jenkins container won’t come up. If you can’t see your container by using docker ps, this will help! Otherwise, you can just ignore it

Issue:

docker ps doesn’t show the running container.

Debug:

docker ps -a shows the container with exit status.

docker logs jenkins shows a volume permission error.

Reason:

* Inside of the Jenkins container, there’s a user named “jenkins” which has a Linux uid of Jenkins.

* You are mounting a docker volume to /var/jenkins_home which is the home directory of that user. If the directory doesn’t have Jenkins userid permissions, then the user won’t be able to write/delete files, which causes the container to exit.

Resolution:

Apply 1000 permissions to your jenkins-data folder, and then restart the container.

sudo chown jenkins:jenkins -R ~/jenkins-data 
docker-compose up -d

Configuring local DNS on the windows server by editing hosts file located in the below path.

windows/system32/drivers/etc/hosts

Add IP Hostname at the end of the file

docker ps

to display the running docker containers

docker exec -ti Jenkins bash

this will give the bash terminal of the Jenkins Container

exit

to come out of the docker container

Each job in the Jenkins has it own Console log . If there is a failure or want to see what happened in the job we can go to console log and verify .

docker cp test.sh Jenkins:/tmp/

This will copy the file from VM to Docker container .

ssh-keygen -f userid

Above command will generate 2 files one is userid.pub and userid . Here one is a public key and another is a private key . Keep private key safely and securily . We will use this for securely connecting to a remote server using SSH .

There will he key exchange required between source and remote server for password less communication where source public key need to be copied in to destination server and configure .

copy userid.pub to /home/remoteuser/.ssh/authorized_keys

/user/sbin/sshd-keygen

to generate keys on the server

/usr/sbin/sshd -D

This is to run the sshd service

docker images

List of images available in the system

docker ps –> to see the running container

docker-compse up -d –> to read and process the config left or newly added to bring up the new container .docker-compose.yml file has the actual configuration

ssh -I useridprivatekey remote@host

using -iOption and private key it will not ask for the password while connecting

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