How to configure proxy settings for Docker daemon in RedHat Linux?

If you are behind corporate firewall and would like to use Docker so it can connect to outside world, do the below settings Docker systemd  service file.

1. Create a systemd directory for the docker service:
   

   sudo mkdir -p /etc/systemd/system/docker.service.d

2. Create a file called /etc/systemd/system/docker.service.d/http-proxy.conf that adds the HTTP_PROXY environment variable:
   
   

   [Service]
   Environment="HTTP_PROXY=http://proxy.example.com:80/"
   

   Or, if you are behind an HTTPS proxy server, create a file called /etc/systemd/system/docker.service.d/https-proxy.conf that adds the HTTPS_PROXY environment variable:
   

   [Service]
   Environment="HTTPS_PROXY=https://proxy.example.com:443/"

3. If you have internal Docker registries that you need to contact without proxying you can specify them via the NO_PROXY environment variable:
   

   [Service] Environment="HTTP_PROXY=http://proxy.example.com:80/" "NO_PROXY=localhost,127.0.0.1,docker-registry.somecorporation.com"

   Or, if you are behind an HTTPS proxy server:
   

   [Service] Environment="HTTPS_PROXY=https://proxy.example.com:443/" "NO_PROXY=localhost,127.0.0.1,docker-registry.somecorporation.com"

4. Flush changes:
   

   $ sudo systemctl daemon-reload

5. Restart Docker:
   

   $ sudo systemctl restart docker

6. Verify that the configuration has been loaded:
   

   $ systemctl show --property=Environment docker
   Environment=HTTP_PROXY=http://proxy.example.com:80/

   Or, if you are behind an HTTPS proxy server:
   
   

   $ systemctl show --property=Environment docker
   Environment=HTTPS_PROXY=https://proxy.example.com:443/
   

How to Install Docker on RedHat Enterprise Linux 7.5 - Install docker on Linux RHEL -

Find steps for installing Docker 18.03.1 Community Edition on RHEL 7.5:

yum install -y yum-utils

sudo yum install wget

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

sudo rpm -ivh epel-release-latest-7.noarch.rpm

sudo yum install -y http://mirror.centos.org/centos/7/extras/x86_64/Packages/container-selinux-2.55-1.el7.noarch.rpm


Setup Docker community repository on RedHat

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Install Docker CE

sudo yum install -y docker-ce

Start Docker daemon

sudo systemctl restart docker

Install Jenkins on Linux | Install Jenkins Red Hat Enterprise Linux 7.5 - How to setup Jenkins on Red Hat Linux

How to Install Jenkins on Red Hat Enterprise Linux?

Please find below steps:

You need to setup Java first.
 

sudo yum install wget -y

Java Installation
sudo yum install java-1.8.0-openjdk-devel -y

Add Jenkins repository to yum repository
sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins.io/redhat-stable/jenkins.repo

sudo rpm --import http://pkg.jenkins.io/redhat-stable/jenkins.io.key

Install Jenkins
sudo yum install jenkins -y

Start Jenkins
sudo systemctl  start jenkins
sudo systemctl  enable jenkins

Get Jenkins Admin Password
sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Copy the output of the above command.
Now go to browser and access the Jenkins page.

http://dns_name:8080

Your page will look something like this. Now paste the password into the below Administrator password text box.

Press Continue..Click on install suggested plug-ins..

Install Ansible on RedHat linux - Install Ansible on RHEL 7.5 - How to install Ansible on RedHat Enterprise Linux 7.5 - Install Ansible on RedHat linux

How to Install Ansible on RedHat linux Enterprise ?

Let us see how to install Ansible on RedHat Enterprise Linux machine.

Download EPEL for Enterprise Linux

sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

Also enable the optional and extras repositories since EPEL packages may depend on packages from these repositories:

sudo subscription-manager repos --enable "rhel-*-optional-rpms" --enable "rhel-*-extras-rpms"

Update repository

sudo yum update

Install Ansible
sudo yum install ansible

ansible --version

TerraForm Installation Steps on RedHat Enterprise Linux (RHEL) 7.5 - How to install Terraform on RedHat Enterprise Linux 7.5 ?

Please find steps for installing Terraform on RedHat Enterprise Linux (RHEL) 7.5. You can install this on any of your existing RedHat Enterprise Linux EC2 instance.

Terraform is used for provisioning resources and infrastructure on Cloud. You don't need to create manually any resource on cloud.

Please find steps for installing Terraform on Linux:

sudo yum update
sudo mkdir -p /opt/terraform
cd /opt/terraform/
sudo yum install wget

Download Terraform
sudo wget https://releases.hashicorp.com/terraform/0.11.7/terraform_0.11.7_linux_amd64.zip

Extract Terraform

sudo yum install unzip -y
sudo unzip terraform_0.11.7_linux_amd64.zip

Add Path to Profile
add Terraform installed path to PATH by modifying below file:

sudo vi /etc/profile

go to end of the file, add the below line:

export PATH=$PATH:/opt/terraform 

source /etc/profile
Verify Installation

now type  below command to see Terraform is installed or not:
terraform --version

Terraform v0.11.7

Jenkins Nexus Integration - How to Integrate SonaType Nexus with Jenkins - Upload artifacts from Jenkins to Nexus repository

You need to install Nexus artifact uploader plug-in to integrate Nexus with Jenkins. Let us see how to integrate Jenkins with Nexus and able to upload war/ear/jar/exe/DLLs.

Pre-requisites:

Install Nexus Artifact Uploader plugin in Jenkins.

Steps:

1. Once you installed the above plug-ins, click existing FreeStyle job configuration or create a new job.

2. Under source code management. enter GitHub or Bitbucket repo url and git credentials.

3. Go to build section, add Maven targets. with goals clean install. Also click advance, give path of POM.xml

4. click on Add build step, choose Nexus artifact uploader.

5. Enter information per below screen shot.
Make sure you enter version as 1.0-SNAPSHOT and repository as maven-snapshots. You can take the information from your WebApp/pom.xml from Bitbucket Repo

6. Click on Apply, Save.

7. Now login to Nexus repo, Click on Components, Click on maven-snapshots

8. you shall see the WAR being uploaded here.

Note:

Click here for Jenkins pipeline code for Nexus Upload.

Click below to watch the YouTube video: