new repo

Author: anniepamela2020

Ansible/Ansible_install

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+#### On RHEL 8.x server
+
+1. Install Python latest version  (on Control node and Managed host)
+   ```sh 
+   yum install python3 -y
+   ```
+
+1. By default, python3 is the command to run python commands. to use just python, use "alternatives" command.  (on Control node and Managed host)
+   ```sh 
+   alternatives --set python /usr/bin/python3
+   ```
+
+1. Check for Python version  
+   ```sh 
+   python --version
+   ```
+1. Install python-pip package manager  (on Control node)
+   ```sh 
+   yum -y install python3-pip
+   ```
+
+1. Create a new user for ansible administration & grant admin access to the user  (on Control node and Managed host)
+   ```sh 
+   useradd ansadmin
+   passwd ansadmin
+   ```
+1. Below command adds ansadmin to sudoers file. But we strongly recommended using "visudo" command if you are aware vi or nano editor.  (on Control node and Managed host)
+   ```sh
+   echo "ansadmin ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+   ```
+1. Using key-based authentication is advised. If you are still at the learning stage use password-based authentication (on Control node and Managed host)
+   ```sh 
+   # sed command replaces "PasswordAuthentication no to yes" without editing file 
+    sed -ie 's/PasswordAuthentication no/PasswordAuthentication yes/' /etc/ssh/sshd_config
+    sudo service sshd reload
+   ``` 
+
+    #### Install Ansible as a ansadmin user (on Control node)
+   ```sh 
+   su - ansadmin
+   pip3 install ansible --user
+   ``` 
+      Note: Ansible must be installed as a user (here ansadmin)
+1. check for ansible version 
+   ```sh
+   ansible --version
+   ```
+
+1. Log in as a ansadmin user on master and generate ssh key (on Control node)
+   ```sh 
+   ssh-keygen
+   ```
+1. Copy keys onto all ansible managed hosts (on Control node)
+   ```sh 
+   ssh-copy-id ansadmin@<target-server>
+   ```
+### Validation test
+
+1. Create a directory /etc/ansible and create an inventory file called "hosts" add control node IP address in it. 
+   
+1. Run ansible command as ansadmin user it should be successful (Master)
+   ```sh 
+   ansible all -m ping
+   ```

Ansible/Ansible_install_on_RHEL.MD

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+# Ansible Installation
+
+Ansible is an open-source automation platform. It is very, very simple to set up and yet powerful. Ansible can help you with configuration management, application deployment, task automation.
+
+### Pre-requisites
+
+1. An AWS EC2 instance (on Control node)
+
+### Installation steps:
+#### on Amazon EC2 instance
+
+1. Install python and python-pip
+   ```sh
+   yum install python
+   yum install python-pip
+   ```
+1. Install ansible using pip check for version
+    ```sh
+    pip install ansible
+   ansible --version
+   ```
+   
+1. Create a user called ansadmin (on Control node and Managed host)  
+   ```sh
+   useradd ansadmin
+   passwd ansadmin
+   ```
+1. Below command grant sudo access to ansadmin user. But we strongly recommended using "visudo" command if you are aware vi or nano editor.  (on Control node and Managed host)
+   ```sh
+   echo "ansadmin ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+   ```
+   
+1. Log in as a ansadmin user on master and generate ssh key (on Control node)
+   ```sh 
+   ssh-keygen
+   ```
+1. Copy keys onto all ansible managed hosts (on Control node)
+   ```sh 
+   ssh-copy-id ansadmin@<target-server>
+   ```
+
+1. Ansible server used to create images and store on docker registry. Hence install docker, start docker services and add ansadmin to the docker group. 
+   ```sh
+   yum install docker
+   
+   # start docker services 
+   service docker start
+   service docker start 
+   
+   # add user to docker group 
+   usermod -aG docker ansadmin
+
+   ```
+1. Create a directory /etc/ansible and create an inventory file called "hosts" add control node and managed hosts IP addresses to it. 
+ 
+### Validation test
+
+   
+1. Run ansible command as ansadmin user it should be successful (Master)
+   ```sh 
+   ansible all -m ping
+   ```

Ansible/Ansible_installation.MD

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+## What is Docker Hub Registry
+
+Docker Hub is a cloud-based registry service which allows you to link to code repositories, build your images and test them, stores manually pushed images, and links to Docker Cloud so you can deploy images to your hosts. It provides a centralized resource for container image discovery, distribution and change management, user and team collaboration, and workflow automation throughout the development pipeline.
+
+##### Ref URL : https://docs.docker.com/docker-hub/
+
+1. Create a docker hub account in https://hub.docker.com/
+
+1. Pull a docker image 
+
+   ```sh 
+   docker pull ubuntu
+   ```
+
+1. pull a docker image with the old version
+
+   ```sh
+   docker pull ubuntu:16.04
+   ```
+
+1. create a custom tag to the docker image
+   ```sh
+   docker tag ubuntu:latest valaxy/ubuntu:demo
+   ```
+
+1. login to your docker hub registry 
+   ```sh
+   docker login
+   docker push valaxy/ubuntu:demo
+   ```
+
+### testing 
+
+1. Remove all images in docker server 
+   ```sh 
+   docker image rm -f <Image_id>
+   ```
+
+1. Pull your custom image from your docker account
+   ```sh
+   docker pull valaxy/ubuntu:demo
+   ```
+

Docker/DockerHub.MD

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+
+1. how to search a docker image in hub.docker.com
+```sh
+docker search httpd
+```
+2. Download a docker image from hub.docker.com
+```sh
+docker image pull <image_name>:<image_version/tag>
+```
+
+3. List out docker images from your local system
+```sh
+docker image ls
+```
+
+4. Create/run/start a docker container from image
+```sh
+docker run -d --name <container_Name> <image_name>:<image_version/tag>
+
+d - run your container in back ground (detached)
+```
+
+5. Expose your application to host server
+```sh
+docker run -d  -p <host_port>:<container_port> --name <container_Name> <image_name>:<Image_version/tag>
+
+docker run -d --name httpd_server -p 8080:80 httpd:2.2
+```
+
+6. List out running containers
+```sh
+docker ps
+```
+
+7. List out all docker container (running, stpooed, terminated, etc...)
+```sh
+docker ps -a
+```
+
+8. run a OS based container which interactive mode (nothing but login to container after it is up and running)
+
+```sh
+docker run -i -t --name centos_server centos:latest
+i - interactive
+t - Terminal
+```
+
+9. Stop a container 
+```sh
+docker stop <container_id>
+```
+
+10. Start a container which is in stopped or exit state
+
+```sh
+docker start <container_id>
+```
+11. Remove a container
+
+```sh
+docker rm <container_id>
+```
+
+12. login to a docker container
+```sh
+docker exec -it <container_Name> /bin/bash
+```

Docker/Docker_Commands.MD

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+# Installing Docker on Amazon Linux server
+
+### Pre-requisites
+1. Amazon Linux EC2 Instance
+
+## Installation Steps
+
+1. Install docker and start docker services
+   ```sh 
+   yum install docker -y
+   docker --version 
+   
+   # start docker services
+   service docker start
+   service docker status
+   ```
+1. Create a user called dockeradmin
+   ```sh
+   useradd dockeradmin
+   passwd dockeradmin
+   ```
+1. add a user to docker group to manage docker 
+   ```
+   usermod -aG docker dockeradmin
+   ```
+### Validation test
+1. Create a tomcat docker container by pulling a docker image from the public docker registry
+   ```sh
+   docker run -d --name test-tomcat-server -p 8090:8080 tomcat:latest
+   ```
+
+## Docker Installation on CentOS server
+##### Referance URL : https://docs.docker.com/install/linux/docker-ce/centos/#install-using-the-repository
+### Pre-requisites
+
+Please follow below steps to install docker CE on CentoOS server instance. For RedHat only Docker EE available 
+
+1. Install the required packages.
+
+   ```sh 
+   sudo yum install -y yum-utils \
+   device-mapper-persistent-data \
+   lvm2
+   ```
+  
+1. Use the following command to set up the stable repository.
+ 
+   ```sh 
+   sudo yum-config-manager \
+   --add-repo \
+   https://download.docker.com/linux/centos/docker-ce.repo
+   ```
+
+### INSTALLING DOCKER CE
+
+1. Install the latest version of Docker CE.
+   ```sh 
+   sudo yum install docker-ce
+   ```
+
+   Note: If prompted to accept the GPG key, verify that the fingerprint matches 
+060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35, and if so, accept it.
+
+1. Start Docker.
+   ```sh 
+   sudo systemctl start docker
+   ```
+
+1. Verify that docker is installed correctly by running the hello-world image.
+   ```sh
+   sudo docker run hello-world
+   ```

Docker/Docker_Installation_Steps.MD

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+FROM ubuntu:12.04
+
+MAINTAINER Valaxy Technologies [email protected]
+
+LABEL version="1.1.0" \
+      app_name="Training registration application" \
+	  release_date="9-Sep-2018"
+RUN apt-get update && apt-get install -y apache2 && apt-get clean
+
+ENV APACHE_RUN_USER www-data
+ENV APACHE_RUN_GROUP www-data
+ENV APACHE_LOG_DIR /var/log/apache2
+
+EXPOSE 80
+
+COPY index.html /var/www/html
+CMD ["/usr/sbin/apache2", "-D", "FOREGROUND"]
+	  
+	  
+
+
+
+

Docker/install_apache_dockerfile.txt

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+# Ansible integration with Jenkins
+
+Follow this on **[YouTube](https://www.youtube.com/watch?v=nE4b9mW2ym0)**
+
+### Prerequisites:
+1. Ansible server **[Get Help Here](https://www.youtube.com/watch?v=79xFyOc_eEY)**
+2. Jenkins Server **[Get Help Here](https://www.youtube.com/watch?v=M32O4Yv0ANc)**
+
+### Part-01 Integration Setps
+
+Install "publish Over SSH"
+ - `Manage Jenkins` > `Manage Plugins` > `Available` > `Publish over SSH` 
+
+Enable connection between Ansible and Jenkins
+- `Manage Jenkins` > `Configure System` > `Publish Over SSH` > `SSH Servers` 
+
+	- SSH Servers:
+		- Hostname:`<ServerIP>`
+		- username: `ansadm`
+		- password: `*******`
+
+Test the connection "Test Connection"

Jenkins/Ansible_integration.MD

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+# Configure Git pulgin on Jenkins
+Git is one of the most popular tools for version control system. you can pull code from git repositories using jenkins if you use github plugin. 
+
+
+#### Prerequisites
+1. Jenkins server 
+
+#### Install Git on Jenkins server
+1. Install git packages on jenkins server
+   ```sh
+   yum install git -y
+   ```
+
+#### Setup Git on jenkins console
+- Install git plugin without restart  
+  - `Manage Jenkins` > `Jenkins Plugins` > `available` > `github`
+
+- Configure git path
+  - `Manage Jenkins` > `Global Tool Configuration` > `git`
+