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How to setup Linux Jenkins nodes

This page describes how to set up a Linux machine for ROS 2 CI jobs using AWS.

Creating an AWS instance

In short, use the company AWS account to launch an instance running based off the official Ubuntu 16.04 AMI.

• AMI: Ubuntu 16.04

• Region: N. California us-west-1a

• Type: c4.large

• Storage: EBS 1TB

• Security Group: ROS 2 Jenkins Build Machines

• Key pair: Create a new pair with a descriptive name like ci_ros2_linux_4

  • Make sure to save it with the other credentials so others can access this machine

Give the instance a descriptive name like ROS 2 CI (linux 4). Record the IP address here (private).

Setting up the machine

In short, make sure the jenkins master can ssh into the new node and run docker.

1. Use the key pair to log into the new node

   • ssh -i ci_ros2_linux_4.pem ubuntu@IPADDRESS

2. Run the following commands

   sudo apt update
   sudo apt install -y git
   sudo apt install -y openjdk-8-jre-headless
   sudo bash -c 'echo "deb http://repositories.ros.org/ubuntu/testing/ `lsb_release -cs` main" > /etc/apt/sources.list.d/ros-latest.list'
   sudo bash -c 'curl --silent https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc |sudo apt-key add -'
   sudo apt update
   sudo apt install -y python-vcstool
   curl -fsSL https://get.docker.com/ | sh
   sudo adduser --disabled-password jenkins
   sudo usermod -aG docker jenkins
   sudo service docker start
   

3. Make sure the jenkins user can run docker

   sudo su jenkins
   docker run hello-world
   

4. As the jenkins user, add the master’s public key to authorized_keys

   1. SSH into the jenkins master and get the contents of the public key (probably at /var/lib/jenkins/.ssh/id_rsa.pub, or wherever the home directory of the jenkins user is)

   2. SSH into the new slave and add that key to the authorized keylist .. code-block:: bash

      # on new slave cd /home/jenkins/ mkdir .ssh chmod 700 .ssh touch .ssh/authorized_keys chmod 600 .ssh/authorized_keys # Paste id_rsa.pub from the jenkins master into this file vim .ssh/authorized_keys

Adding it to the master

1. Add a new agent to https://ci.ros2.org/computer/

   • Number of executors: 1

   • Remote root directory: /home/jenkins

   • Labels: linux

   • Launch method: Launch slave agents via ssh

     • Host: Ip address of new node

     • Credentials: Jenkins

     • Host Key Verification Strategy: Manually provided key verification strategy

       • SSH Key paste the contents of /etc/ssh/ssh_host_rsa_key.pub from the new node here.

     • Node Properties:

       • Check Notify when Node online status changes and set the email to the ros2 buildfarm google group.

2. Launch the agent on the new node