Apply a change, anything. For example we will add a label stage: dev. Edit the file templates/_helpers.tpl
1{{- define "web.labels" -}}
2stage: "dev"
3...
Deploy a new revision with the same command we ran previously
1helm upgrade --install web web
Now we can have a look to the changes we’ve made so far to the release
1$ helm history web
2REVISION UPDATED STATUS CHART APP VERSION DESCRIPTION
31 Mon Feb 15 15:11:09 2021 superseded web-0.1.0 1.16.0 Install complete
4...
54 Mon Feb 15 21:15:25 2021 superseded web-0.1.0 1.16.0 Upgrade complete
65 Mon Feb 15 21:21:21 2021 deployed web-0.1.0 1.16.0 Upgrade complete
We can then check what would be the changes if we rollback to the previous revision
1helm diff rollback web 4
2default, web, Deployment (apps) has changed:
3 # Source: web/templates/deployment.yaml
4 apiVersion: apps/v1
5 kind: Deployment
6 metadata:
7 name: web
8 labels:
9- stage: "dev"
10 helm.sh/chart: web-0.1.0
11...
Now that we’re sure we can safely rollback to the previous revision
1helm rollback web 4
2Rollback was a success! Happy Helming!