Login to your OpenStack UI (aka Horizon)

Navigate through the side bar to:

Project > Compute > Access & Security

Click on the Security Groups tab

Click Manage Rules

Click Add Rule to create an SSH rule

Select SSH from the Rule drop down menu

Click Add

Click Add Rule to create a rule to allow Jenkins web access

Type 8080 in the Port input field

Click Add

Click Add Rule again

Select Egress from the Direction drop down menu

Type 8080 in the Port input field

Click Add

Navigate to Project > Compute > Access & Security

Click on the Key Pairs tab

Click on Import Key Pair

Switch to a terminal window

Type the following, then follow the instructions

cd ~/.ssh
ssh-keygen -t rsa -f cloud.key
cat cloud.key.pub

Copy the output from the cat command, it should start with ssh-rsa

Paste it into the Public Key text area

Enter cloud in the Key Pair Name input field

Click on import key pair

Navigate Project > Compute > Instances

Click on Launch Instance

Type jenkins into the Instance Name input field

Select Boot from image from the Instance Boot Source drop down menu

Select the latest ubuntu server available

Click on the Access & Security tab

Verify that the cloud key pair is selected and the default security group is checked

Click Launch

From the Actions column

Click the drop down arrow to select Associate Floating IP

From the pop up modal window click the + button to create a new floating IP address

Click on Allocate IP

Click Associate

From the terminal ssh using the following command (with the IP that was just allocated)

ssh -i ~/.ssh/cloud.key ubuntu@[replace with your floating IP]

Run the following commands to install Jenkins

sudo -i
wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | apt-key add -
echo deb http://pkg.jenkins-ci.org/debian binary/ > /etc/apt/sources.list.d/jenkins.list
apt-get update
apt-get install jenkins
/etc/init.d/jenkins restart
exit

Open a browser and navigate to [http://[your floating ip]:8080/](http://[your floating ip]:8080/)