TL;DR
The issue you've encountered:
2020-07-08T12:51:28.0899772Z Error: UPGRADE FAILED: failed to create resource: Deployment.apps "NAME" is invalid: [spec.template.spec.volumes[1].secret.secretName: Required value, spec.template.spec.containers[0].volumeMounts[2].name: Not found: "secretvol"]
is connected with the fact that the variable: {{ .Values.secret.secretvol }} is missing.
To fix it you will need to set this value in either:
- Helm command that you are using
- File that stores your values in the Helm's chart.
A tip!
You can run your Helm command with --debug --dry-run to output generated YAML's. This should show you where the errors could be located.
There is an official documentation about values in Helm. Please take a look here:
Basing on
I have been trying to create a POD with HELM UPGRADE:
I've made an example basing on your issue and how you can fix it.
Steps:
- Create a helm chart with correct values
- Edit the values to reproduce the error
Create a helm chart
For the simplicity of the setup I created basic Helm chart.
Below is the structure of files and directories:
❯ tree helm-dir
helm-dir
├── Chart.yaml
├── templates
│ └── pod.yaml
└── values.yaml
1 directory, 3 files
Create Chart.yaml file
Below is the Chart.yaml file:
apiVersion: v2
name: helm-pod
description: A Helm chart for spawning pod with volumeMount
version: 0.1.0
Create a values.yaml file
Below is the simple values.yaml file which will be used by default in the $ helm install command
usedImage: ubuntu
confidentialName: secret-password # name of the secret in Kubernetes
Create a template for a pod
This template is stored in templates directory with a name pod.yaml
Below YAML definition will be a template for spawned pod:
apiVersion: v1
kind: Pod
metadata:
name: {{ .Values.usedImage }} # value from "values.yaml"
labels:
app: {{ .Values.usedImage }} # value from "values.yaml"
spec:
restartPolicy: Never
containers:
- name: {{ .Values.usedImage }} # value from "values.yaml"
image: {{ .Values.usedImage }} # value from "values.yaml"
imagePullPolicy: Always
command:
- sleep
- infinity
volumeMounts:
- name: secretvol # same name as in spec.volumes.name
mountPath: "/etc/secret-vol"
readOnly: true
volumes:
- name: secretvol # same name as in spec.containers.volumeMounts.name
secret:
secretName: {{ .Values.confidentialName }} # value from "values.yaml"
With above example you should be able to run $ helm install --name test-pod .
You should get output similar to this:
NAME: test-pod
LAST DEPLOYED: Thu Jul 9 14:47:46 2020
NAMESPACE: default
STATUS: DEPLOYED
RESOURCES:
==> v1/Pod
NAME READY STATUS RESTARTS AGE
ubuntu 0/1 ContainerCreating 0 0s
Disclaimer!
The ubuntu pod is in the ContainerCreating state as there is no secret named secret-password in the cluster.
You can get more information about your pods by running:
$ kubectl describe pod POD_NAME
Edit the values to reproduce the error
The error you got as described earlier is most probably connected with the fact that the value: {{ .Values.secret.secretvol }} was missing.
If you were to edit the values.yaml file to:
usedImage: ubuntu
# confidentialName: secret-password # name of the secret in Kubernetes
Notice the added #.
You should get below error when trying to deploy this chart:
Error: release test-pod failed: Pod "ubuntu" is invalid: [spec.volumes[0].secret.secretName: Required value, spec.containers[0].volumeMounts[0].name: Not found: "secretvol"]
I previously mentioned the --debug --dry-run parameters for Helm.
If you run:
$ helm install --name test-pod --debug --dry-run .
You should get the output similar to this (this is only the part):
---
# Source: helm-pod/templates/pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: ubuntu # value from "values.yaml"
labels:
app: ubuntu # value from "values.yaml"
spec:
restartPolicy: Never
containers:
- name: ubuntu # value from "values.yaml"
image: ubuntu # value from "values.yaml"
imagePullPolicy: Always
command:
- sleep
- infinity
volumeMounts:
- name: secretvol # same name as in spec.volumes.name
mountPath: "/etc/secret-vol"
readOnly: true
volumes:
- name: secretvol # same name as in spec.containers.volumeMounts.name
secret:
secretName: # value from "values.yaml"
As you can see the value of secretName was missing. That's the reason above error was showing up.
secretName: # value from "values.yaml"
