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Cluster zones#

Prerequisites#

Inputs#

export GIT_PATH="${HOME}/git/"
export ZONE_NAME="kub-..."
export ENVS_NG="${GIT_PATH}/caascad/terraform/envs-ng"

1 - Requirements#

Before destroying the cluster zone ensure all service zones on it have destroyed or migrated.

The zones are named svc-${ZONE_NAME} and obs-${ZONE_NAME}. All other service and contract zones should already have been removed at the previous step.

# Service zone svc-<cluster>
trackbone destroy -t purge=true -z "svc-${ZONE_NAME}" --non-interactive --detailed-exitcode -n 8 --add-services
# Contract zone obs-<cluster>
trackbone destroy -t purge=true -z "obs-${ZONE_NAME}" --non-interactive --detailed-exitcode -n 8

3 - Destroy the cluster zone#

Get the zone line abbreviation

cd "${ENVS_NG}/zones/ngot_zones"
LINE=$(cue export | jq --arg ZONE_NAME "${ZONE_NAME}" -r '.zones[$ZONE_NAME].metadata.line')
LINE_ABBR=$(cue export | jq --arg LINE "${LINE}" -r '.lines[$LINE].abbr')

cd "${ENVS_NG}/contexts/ngot"
trackbone destroy -z ${ZONE_NAME} -t purge=true --non-interactive --add-services

4 - Remove zone in zone module (envs-ng)#

Simply remove the cluster corresponding line in clusters.cue:

cd "${ENVS_NG}/zones/ngot_zones"
vi clusters.cue
"kub-10000": type: "cluster" // to delete
"kub-10000": az_list: ["a", "c"] // to delete

Create a MR:

git switch -c "decom ${ZONE_NAME}"
# Run script to generate static files from zones
generate-static-zones-files
cd ${ENVS_NG}
# Add all modifications to the commit
git add zones/
git add gen/
git commit -m "Decom ${ZONE_NAME} zone"
# Create target branch
git push -u origin "${ZONE_NAME}"

Do not forget to merge the merge request.

5 - Redeploy central components#

The following commands should be run from a branch where the cluster has been removed. Ideally, the MR above should have been merged and these commands should be run from master branch.

cd "${ENVS_NG}/contexts/ngot"
trackbone apply --non-interactive --add-services      \
        -z svc-monitoring-stack-corp-"${LINE_ABBR}"-1 \
        -z svc-monitoring-stack-corp-"${LINE_ABBR}"-2 \
        -c federate-metrics-mom-scrapeconfig          \
        -c prometheus-rules

6 - Update drifts pipeline#

Follow this page to update the list of configuration's zones and update concourse pipelines