Devops Project-4- By using Git, Jenkins, Ansible, DockerHub, Docker to DEPLOY on a docker container by Raj Gupta

In part-01 we create Docker image on ansible server through Jenkins job and pushed it onto DockerHub.

1. Docker should be installed on ansible server
2. Should login to "docker hub" on ansible server
3. Docker admin user should be part of docker group

In Part-02 we create create_docker_container.yml playbook. this get intiated by jenkins job, run by ansible and exected on dokcer_host

In Part-03 we try to improvise to store docker images previous version

So for we used latest docker image to build a container, but what happens if latest version is not working? One easiest solution is, maintaining version for each build. This can be achieved by using environment variables.

Take 3 EC2 REHL server as below for Jenkins server, Ansible Server and Docker host

On Jenkins server: -  Do the same setup for Jenkins server as project 1. (install jenkins, git,, maven and java on REHL Jenkins server)

On Ansible Server install ansible as below:-

rpm -Uvh http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

yum install ansible

ansible –version

adding client to ansible master

cd /etc/ansible

vi hosts

then add all clients private ip in this file on top and save it

[web]

172.31.38.44      ...like this

then to check the master and client past below in master

[root@ip-172-31-18-161 ~]# ansible -m ping all

On Dokcer_host  server: -  Do the same setup as project 3

To install Docker on RHEL server give the below command

rpm -ivh ftp://ftp.icm.edu.pl/vol/rzm3/linux-slc/centos/7.1.1503/extras/x86_64/Packages/container-selinux-2.9-4.el7.noarch.rpm
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce

docker --version

service docker start

service docker status

usermod -aG docker dockeradmin     ----- Docker admin user should be part of docker group

Note: --Docker must be install in both Ansible Server(master) and Docker host Server(client) also below command must be run in both the server(master and client)

[root@ip-172-31-89-34 docker]# docker login --username=rajguptaaws --password=aurangabad    

Install below 2 plugging in Jenkins

publish over ssh and Deploy to container

then create a job in Jenkins and give the below in different tab: -

Source Code Management:

• Repository : https://github.com/rajkumargupta14/hello-world.git
• Branches to build : */master

Build:

• Root POM:pom.xml
• Goals and options : clean install package

Before doing below step create the entry for ansible_server in Manage Jenkins-àConfigure System-à Publish over SSH-à then click on ADD and fill the below

For more details check the project 3

Note crate below in ansible server

[root@ip-172-31-40-233 ~]# mkdir /opt/docker

Post Steps

• Send files or execute commands over SSH
• Name: ansible_server
• Source files : webapp/target/*.war
• Remove prefix : webapp/target
• Remote directory : //opt//docker
• Send files or execute commands over SSH
• Name: ansible_server
• Source files : Dockerfile
• Remote directory : //opt//docker
• Exec Command:

cd /opt/docker

docker build -t raj_demo4 .

docker tag raj_demo4 rajguptaaws/raj_demo4

docker push rajguptaaws/raj_demo4

docker rmi raj_demo4 rajguptaaws/raj_demo4

1.    Login to Docker host and check images and containers. (no images and containers)

[dockeradmin@ip-172-31-40-233 ~]$ docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

[dockeradmin@ip-172-31-40-233 ~]$ docker ps

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

2.    login to docker hub and check. shouldn't find images with for raj_demo4

3.    Execute Jenkins job

4.    check images in Docker hub. Now you could able to see new images pushed to rajguptaaws Docker_Hub

Note:- if you get access issue then run the below command

[ec2-user@ip-172-31-35-164 ~]$ sudo -i

[root@ip-172-31-35-164 ~]# cd /opt/docker

[root@ip-172-31-35-164 docker]# chown -R dockeradmin:dockeradmin /opt/docker

[root@ip-172-31-35-164 docker]#

Part-02 : Deploy Containers

In the ansible server

[root@ip-172-31-35-164 ~]# cd /opt

[root@ip-172-31-35-164 opt]# mkdir playbooks

[root@ip-172-31-35-164 opt]# ls

containerd  docker  playbooks

[root@ip-172-31-35-164 opt]# cd playbooks/

[root@ip-172-31-35-164 playbooks]# pwd

/opt/playbooks

[root@ip-172-31-35-164 playbooks]# su - dockeradmin

Last login: Fri Feb  1 11:59:39 UTC 2019 on pts/1

[dockeradmin@ip-172-31-35-164 ~]$ cd /opt

[dockeradmin@ip-172-31-35-164 opt]$ ls

containerd  docker  playbooks

[dockeradmin@ip-172-31-35-164 opt]$ sudo chown dockeradmin: dockeradmin playbooks

[dockeradmin@ip-172-31-35-164 opt]$ cd playbooks/

[dockeradmin@ip-172-31-35-164 playbooks]$ sudo vi create_docker_container.yml

Then copy the below code

- hosts: all

  tasks:

  - name: stop previous version docker

    shell: docker stop raj_demo4

  - name: remove stopped container

    shell: docker rm -f raj_demo4

  - name: remove docker images

    shell: docker image rm -f rajguptaaws/raj_demo4

  - name: create docker image

    shell: docker run -d --name raj_demo4 -p 8090:8080 rajguptaaws/raj_demo4

if you get the permission issue then run the below command in ansible server

[dockeradmin@ip-172-31-35-164 opt]$ sudo chown dockeradmin: dockeradmin playbooks

[dockeradmin@ip-172-31-35-164 opt]$ cd playbooks/

[dockeradmin@ip-172-31-35-164 playbooks]$ ls -ld

drwxr-xr-x. 2 dockeradmin dockeradmin 78 Feb  1 12:37 .

to run playbook manually use below command

[dockeradmin@ip-172-31-35-164 playbooks]$ ansible-playbook -v create_docker_container.yml

Now Add this script to Jenkins job.

• Chose "configure" to modify your jenkins job.
• Under post build actions
• Send files or execute commands over SSH
• Exec Command:

cd /opt/playbooks

ansible-playbook -v create_docker_container.yml

1.    Execute Jenkins job.

2.    You could see a new container on your docker host. can able access it from browser on port 8090

http://54.152.73.16:8090/webapp/      -----Take the public ip of docker host

Part-03 : Deploy with Version Control Containers

we use 2 variables

• BUILD_ID - The current build id of Jenkins (every time you click on build now it will create new build id like 1,2,3,4,5,6……..)
• JOB_NAME - Name of the project of this build. This is the name you gave your job when you first set it up like in our case hellow-world

add the below part:-

Send files or execute commands over SSH

Name: ansible_server

Source files    : Dockerfile

Remote directory      : //opt//docker

cd /opt/docker

docker build -t $JOB_NAME:v1.$BUILD_ID .

docker tag $JOB_NAME:v1.$BUILD_ID rajguptaaws/$JOB_NAME:v1.$BUILD_ID

docker tag $JOB_NAME:v1.$BUILD_ID rajguptaaws/$JOB_NAME:latest

docker push rajguptaaws/$JOB_NAME:v1.$BUILD_ID

docker push rajguptaaws/$JOB_NAME:latest

docker rmi $JOB_NAME:v1.$BUILD_ID rajguptaaws/$JOB_NAME:v1.$BUILD_ID

rajguptaaws/$JOB_NAME:latest

Now do the changes in ansible code as per below yellow part:

- hosts: all

  tasks:

  - name: stop previous version docker

    shell: docker stop raj_demo4

  - name: remove stopped container

    shell: docker rm -f raj_demo4

  - name: remove docker images

    shell: docker image rm -f rajguptaaws/hellow-world:latest

  - name: create docker image

    shell: docker run -d --name raj_demo4 -p 8090:8080 rajguptaaws/hellow-world:latest