Install docker and Jenkins on Digital Ocean droplet
Introduction
Jenkins is an open-source automation server that automates the repetitive technical tasks involved in the continuous integration and delivery of software. Jenkins is Java-based and can be installed from Ubuntu packages or by downloading and running its web application archive (WAR) file — a collection of files that make up a complete web application to run on a server.
In this tutorial, you will install Jenkins by adding its Debian package repository, and using that repository to install the package with apt.
Installation via commands
# Install Java 8
sudo add-apt-repository ppa:webupd8team/java
sudo apt install openjdk-8-jre -ywget -q -O — https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
sudo apt-add-repository “deb https://pkg.jenkins.io/debian-stable binary/”sudo apt-get update
# Install Jenkins
sudo apt install jenkins -y
# Start and expose Jenkins
#if 8080 is used by other software you can change default port of jenkins using vi /etc/sysconfig/jenkins#Inside the configuration file find the flowing line ‘JENKINS_PORT=”8080"’ and replace the port which you want to use.
sudo systemctl start jenkins
sudo systemctl status jenkins
sudo ufw allow <your assigned port> or 8080 #8080 if port has not changed sudo ufw status
Setting up Jenkins
To set up our installation, we’ll visit Jenkins on its default port, 8080, using the server domain name or IP address: http://ip_address_or_domain_name:<assigned port>
We should see “Unlock Jenkins” screen, which displays the location of the initial password
# Install Docker
sudo apt install apt-transport-https ca-certificates curl software-properties-common -y
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository “deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable”
sudo apt update
apt-cache policy docker-ce
sudo apt install docker-ce -y
sudo systemctl status docker
# Give the right permissions to Jenkins on Docker
usermod -aG docker jenkins
usermod -aG root jenkins
chmod 777 /var/run/docker.sock
# Get password for initial setupecho ‘Jenkins initial admin password is:
sudo cat /var/lib/jenkins/secrets/initialAdminPassword
