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Creating a Release in Helm

In this hands-on lab we will be working with release versions of charts in Helm.

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Path Info

Clock icon Intermediate
Clock icon 1h 0m
Clock icon Apr 05, 2019

Contact sales

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Table of Contents

  1. Challenge

    Update the Page Index in `nginx/values.yaml`, Set the Service to `NodePort` with an External Port of `30080`, and Increment the Version Number in `nginx/Chart.yaml`

    Locate the nginx chart that is in the home directory:

    [cloud_user@host]$ cd ~
    [cloud_user@host]$ ls -l

    Modify the index contents found in the values.yaml file (with whatever editor you like -- we're using Vim here with vim ./values.yaml:

    index: >-
    ##insert your html here##

    Set the service to NodePort and the HTTP port to 30080. The entry should match this:

      annotations: {}
      clusterIP: ""
      externalIPs: []
      loadBalancerIP: ""
      loadBalancerSourceRanges: []
      type: NodePort
      port: 8888
      nodePort: "30080"

    Set a version number in Charts.yaml. Edit it (with something like vim ./Chart.yaml) and update the value for version.

  2. Challenge

    Initialize and Patch Helm

    Initilize helm using the following command.

    helm init

    Once helm is initilized patch it into the kube sytem using the following command.

    kubectl patch deploy --namespace kube-system tiller-deploy -p'{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'
  3. Challenge

    Release the Chart and Confirm the Version Number of the Released Chart

    Release the chart:

    [cloud_user@host]$ cd ~
    [cloud_user@host]$ helm install nginx

    Once that command has completed, run two commands. This returns the release name:

    [cloud_user@host]$ helm ls --short  

    Look at the chart name for the version on this one.

    [cloud_user@host]$ helm history <release name>

    Obtain the IP address of one of the cluster nodes other than the master and navigate to the IP:Port in a web browser http://(node_IP)"30080"

    Confirm that the index page is correct.

  4. Challenge

    Update the Index Data in the ./nginx/values.yaml File and Increment the Version Number in Charts. Upgrade the Release and Verify the New Version

    Update the contents of the index as done previously
    Increment the version number of the Chart.yaml file as done previously Upgrade the release. helm init helm ls --short <-- this returns the release name helm upgrade (release name) ~/nginx

    Verify the new verison of the release by checking the chart name in the helm history

     helm history (release name)

    Load the index page and confirm the content is correct.

  5. Challenge

    Rollback the Release to the Previous Version and Confirm that the Correct Version is Now Deployed

    Get the available revisions for the helm release

     helm ls --short  <- this returns the release name
     helm history (release name)

    locate the revision number that has the chart version that contains the first version you created.

    helm rollback (release name) (revision number)
    helm history (release name)  <-- verify the correct version is listed as "deployed"

    Allow the pods volumes to update and check the web page content, it should be the first change you made.

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