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Using a Blue/Green Deployment in Nomad

There are times when you need to stage your updates before updating all of your jobs. With blue/green updating, you can run one or more updated jobs and "stage" them before updating all of the running jobs. In this hands-on lab, you will use a blue/green method to perform job upgrades on running jobs in a controlled manner. You have been provided with a Nomad server in developer mode, where you will perform the tasks in this hands-on lab. The Nomad server has been configured with one server agent and one client agent, and Docker has been installed so that Nomad is ready to run jobs.

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Nov 06, 2020

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Table of Contents

  1. Challenge

    Log in to the Provided Nomad Server

    Log in to the server as "cloud_user" with the provided password to perform the tasks.

  2. Challenge

    Create, Modify, and Run a Job File Using the Blue/Green Method of Updates

    1. Using the appropriate commands and the Nomad CLI, initialize a job file called example.nomad.

    2. Modify the nomad file to use a blue/green method for updates.

    3. Modify the job file to start two instances.

    4. Submit the job to run, and wait until the job says it is healthy for all two instances.

  3. Challenge

    Change the Job File to Upgrade the Redis to Version 4

    1. Edit the example.nomad file.

    2. Change the version to be 4.0, and while the original job is running, submit the job to run.

    3. Check if two jobs are running at the same time.

  4. Challenge

    Promote the Deployment

    1. Check the status of the job. You should see it ask for a manual promotion, and there should be two canaries.

    2. Promote the deployment for the updated version of Redis. You should see the promoted change to "true."

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What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

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