Redeploying a Chart

Administrators are able to customize many aspects of the system in order to address problems or tailor it to better suit their requirements. Often this requires redeploying one or more Helm charts. This page outlines the procedure for doing this in CSM. Other parts of the CSM documentation will reference this page if you are instructed to redeploy a chart. In those cases, the source page that links to this one should specify which charts should be redeployed and what customizations (if any) should be made to them.

Prerequisites

  • CSM is fully installed and operational.
  • The latest CSM documentation RPMs are installed on the node where this procedure is being performed. See Check for latest documentation.
  • If this procedure was linked from another page, the administrator must have the following information from that other page:
    • The name of the charts to be redeployed (for example, cray-hms-bss, cray-sysmgmt-health, or spire).
    • The base name of the manifest for each of these charts (for example, sysmgmt, platform, or storage).
    • The customization changes to make, if any.
    • The steps to validate that the chart deployment was successful.

Procedure

1. Preparation

  1. Create a temporary directory to use during this procedure.

    ncn-mw# TEMPDIR=$(mktemp -d) ; echo "${TEMPDIR}"

  2. Change the current working directory to the new directory.

    ncn-mw# cd "${TEMPDIR}"

2. Obtain and optionally update customizations

  1. Save the current set of chart customizations to a file.

    ncn-mw# CUSTOMIZATIONS="${TEMPDIR}/customizations.yaml"
ncn-mw# kubectl get secrets -n loftsman site-init -o jsonpath='{.data.customizations\.yaml}' | base64 -d > "${CUSTOMIZATIONS}"

  2. Edit the ${CUSTOMIZATIONS} file, if appropriate.

    The step involves updating the system customizations. In cases where a chart is being redeployed with no changes, or only changes to the chart version, then this step should be skipped.

    If this procedure was linked from another page, that page should provide instructions on what edits to make, if any.

3. Redeploy charts

If redeploying more than one chart at once, perform the steps in this section for each chart being redeployed.

  1. Set helper variables.

    1. Set variable with the name of the chart.

      If this procedure was linked from another page, that page should provide the chart name. Examples of chart names are cray-hms-bss, cray-sysmgmt-health, or spire.

      ncn-mw# CHART_NAME=<put actual name here>
ncn-mw# echo "${CHART_NAME}"

    2. Set variable with the base manifest name for this chart.

      If this procedure was linked from another page, that page should provide the base manifest name. Examples of base manifest names are sysmgmt, platform, or storage.

      BASE_MANIFEST_NAME=<put actual name here>
echo "${BASE_MANIFEST_NAME}"

    3. Set convenience variables for files that will be created during this procedure.

      ncn-mw# BASE_MANIFEST_FILE="${TEMPDIR}/${BASE_MANIFEST_NAME}.yaml" ; echo "${BASE_MANIFEST_FILE}"
ncn-mw# BASE_CHART_FILE="${TEMPDIR}/${CHART_NAME}.yaml" ; echo "${BASE_CHART_FILE}"
ncn-mw# CUSTOMIZED_CHART_FILE="${TEMPDIR}/${CHART_NAME}-customized.yaml" ; echo "${CUSTOMIZED_CHART_FILE}"

  2. Save the base manifest to a file.

    If redeploying multiple charts, this step does not need to be repeated for additional charts that use the same base manifest name.

    ncn-mw# kubectl get cm -n loftsman "loftsman-${BASE_MANIFEST_NAME}" -o jsonpath='{.data.manifest\.yaml}'  > "${BASE_MANIFEST_FILE}"

  3. Make a copy of this file to use for redeploying the chart.

    ncn-mw# cp -v "${BASE_MANIFEST_FILE}" "${BASE_CHART_FILE}"

  4. Edit the name of the manifest in the new file.

    This is to prevent it from overwriting the original manifest when it is redeployed.

    ncn-mw# NEW_MANIFEST_NAME="${CHART_NAME}-$(date +%Y%m%d%H%M%S)"
ncn-mw# yq w -i "${BASE_CHART_FILE}" 'metadata.name' "${NEW_MANIFEST_NAME}"

  5. Edit the spec.charts list in the ${BASE_CHART_FILE} file so that it only contains the stanza for the chart to be redeployed.

    For example, if the chart being redeployed was cray-cfs-api, then the charts list would resemble the following example after editing. Note that the exact form and values may differ, because this is an example.

          charts:
        - name: cray-cfs-api
          namespace: services
          source: csm-algol60
          version: 1.12.1

  6. Remove chart source fields from the ${BASE_CHART_FILE} file.

    Remove the spec.sources stanza and remove the source field from each chart listing.

    These commands will work even if the stanzas and fields are not present in the file.

    ncn-mw# yq d -i "${BASE_CHART_FILE}" spec.sources && yq d -i "${BASE_CHART_FILE}" spec.charts[\*].source

  7. Update the version numbers in ${BASE_CHART_FILE} if necessary.

    The information in the chart stanza is from the time the chart was deploying during the most recent install or upgrade of the CSM software. However, it is possible that the chart has been redeployed more recently, using a newer chart version. This may happen when a hotfix is installed, or when the procedure on this page was previously followed.

    1. Show most recently deployed chart versions.

      A record is saved in Kubernetes of every Loftsman chart deploy that has happened. This step uses a helper script to find and display the most recent successful deployment of this chart, in order for the administrator to check the version numbers it used.

      ncn-mw# /usr/share/doc/csm/scripts/operations/kubernetes/latest_chart_manifest.sh "${CHART_NAME}"

      Example output for the cray-cfs-api chart may resemble the following:

      Displaying chart manifest for 'cray-cfs-api' from loftsman-sysmgmt

name: cray-cfs-api
namespace: services
source: csm-algol60
swagger:
  - name: cfs
    url: https://raw.githubusercontent.com/Cray-HPE/config-framework-service/v1.12.2/api/openapi.yaml
    version: v1
version: 1.12.1

    2. Edit the version numbers in ${BASE_CHART_FILE} if necessary.

      In the example output from the previous step, the version numbers matches what we saw previously, so no updates are required. If the output shows different version numbers, then edit the version numbers in the chart stanza of ${BASE_CHART_FILE} to match them.

  8. Apply customizations to the manifest.

    This must be done whether or not any changes were made to the customizations in the previous section.

    ncn-mw# manifestgen -c "${CUSTOMIZATIONS}" -i "${BASE_CHART_FILE}" -o "${CUSTOMIZED_CHART_FILE}"

  9. Review the customized manifest file to verify that it contains the expected version numbers and customizations.

    ncn-mw# cat "${CUSTOMIZED_CHART_FILE}"

  10. Redeploy the chart.

    • In most cases, the Helm chart to be used is already in Nexus. Unless this procedure was linked from another page which specified an alternative location for the Helm chart, then run the following command:

      ncn-mw# loftsman ship --charts-repo https://packages.local/repository/charts --manifest-path "${CUSTOMIZED_CHART_FILE}"

    • If this procedure was linked from another page, and that page specified a directory location for the Helm chart, then run the following command, substituting the directory name provided by the linking page.

      ncn-mw# loftsman ship --charts-path <helm_chart_path> --manifest-path "${CUSTOMIZED_CHART_FILE}"

  11. Validate that the redeploy was successful.

    How to do this will vary based on what was redeployed. If this procedure was linked from another page, that page should provide details on how to do this validation.

  12. If additional charts are being redeployed, then repeat the previous steps in this section for each such chart.

4. Save updated customizations

If no changes were made to customizations, then skip this section. If changes were made to customizations, then this step is critical.

Update the copy of the customizations in Kubernetes. If this is not done, then the customization changes will not persist after the next CSM upgrade, the next hotfix that is applied, or the next time that this procedure is followed.

ncn-mw# kubectl delete secret -n loftsman site-init
ncn-mw# kubectl create secret -n loftsman generic site-init --from-file=customizations.yaml

5. Cleanup

The temporary directory created at the beginning of the procedure may be deleted if desired.