To deploy jenkins using this ansible script make sure you have ansible installed on the controller node or local machine

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Controller & Target node pre-configurations

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Debian & Ubuntu Controller Node##

Become Sudo user:

sudo su

Change to root .ssh folder:

cd ~/.ssh

Create keys:

ssh-keygen -t rsa -b 4096 -C "[email protected]"

Save key as default provided:

Enter file in which to save the key (/home/yourusername/.ssh/id_rsa):

Leave passphrase empty - If you do decide to use

a passphrase you may need to setup keychain to

stop needing to enter your password for every deploy:

Enter passphrase (empty for no passphrase):

At this point you will now need to configure the target node to accept ssh from root user using ssh keys only

Debian & Ubuntu target node

Become Sudo user:

sudo su

create sudo password - you will be prompted to enter a password:

passwd

Open ssh config file:

vim /etc/ssh/sshd_config

Un-comment this line to look the same as this:

From:  #PermitRootLogin prohibit-password
To: PermitRootLogin: yes

Relaod ssh setting on target node:

sudo service sshd restart 

OR

sudo /etc/init.d/sshd restart

Debian & Ubuntu controller node

copy ssh key over to target node:

ssh-copy-id root@target-server-ip-address or fqdn

test your ssh connection is working with certificates:

ssh root@target-server-ip-address or fqdn

Debian & Ubuntu target node

Time to secure the ssh connection:

vim /etc/ssh/sshd_config

Modify the following lines:

From: PermitRootLogin yes
To: PermitRootLogin prohibit-password

From: #PubkeyAuthentication yes
To: PubkeyAuthentication yes

From: #PasswordAuthentication yes
To: PasswordAuthentication no

From this point on you will only be able to access the server from certificate based ssh

Relaod ssh setting on target node:

sudo service sshd restart

OR

sudo /etc/init.d/sshd restart

Install python & python3:

apt-get install python python3 -y

Debian & Ubuntu controller node

Add your host to the host file:

vim /etc/ansible/hosts

Add the following to your host file:

[jenkins]
jenkins ansible_host=ip-of-target-node ansible_user=root

And now you can run the ansible playbook:

cd <dir of ansible playbook> 
ansible-playbook deployJenkins.yml -v

** Make sure you use -v for verbose as the Initial Administration password for jenkins will be printed in the output in the second last play and you will need this to finish the configuration in the jenkins UI **