Remarks

sudo yum -y install docker
sudo systemctl start docker
sudo systemctl enable docker
sudo groupadd docker
sudo usermod -aG docker jenkins
sudo systemctl restart jenkins
sudo systemctl restart docker

--------------------------------webserver-----------------

adduser deploy
echo "deploy:jenkins" | chpasswd
groupadd docker
usermod -a -G docker deploy
echo "deploy ALL=(ALL) NOPASSWD: /usr/bin/docker run *" >> /etc/sudoers
echo "deploy ALL=(ALL) NOPASSWD: /usr/bin/docker pull *" >> /etc/sudoers
/usr/bin/yum -y install docker
/usr/bin/systemctl enable docker
/usr/bin/systemctl start docker

yum -y install sshpass  // install only in jeniks server

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https://docs.ansible.com/ansible/modules_by_category.html

https://docs.ansible.com/ansible/latest/reference_appendices/YAMLSyntax.html

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*************JENKINS SLAVE***************

sudo yum -y install git java-1.8.0-openjdk
sudo useradd -d /var/lib/jenkins jenkins
ssh-keygen
cat /home/user/.ssh/id_rsa.pub
sudo mkdir /var/lib/jenkins/.ssh
sudo vi /var/lib/jenkins/.ssh/authorized_keys
sudo chown -R jenkins:jenkins /var/lib/jenkins/.ssh
cat /home/user/.ssh/id_rsa  //copy this key 

go to Jenis // Manage Jenkins // Manage Nodes // new node// node name / select permanent Agent/ ok
Remote root directory - /var/lib/jenkins
Launch method - Launch slave agents via SSH
Host - slave system IP
credentials - add - kind - SSH Usename with Private Key.
username jenkins
privatekey- past the id_rsa key // save
Host key verication - Manually trusted key verication strategy