CI/CD update Multicontainer Pod - docker

Question

I'm trying to build a Multi-container POD via a Pipeline and release via Helm Charts.
For a single container pod I can do this which works, pass the version and the location of the container to the helm chart:
helm upgrade --install \
--set image.repository=${CI_REGISTRY}/${ENVIRONMENT,,}/${CI_PROJECT_NAME} \
--set image.tag=${CI_COMMIT_SHA} \
${CI_PROJECT_NAME} \
How do I pass a version or a location for a specific container if the help chart is a multi container pod ?
containers:
- repo: myrepo/qa/helloworld1
tag: e2fd70931d264490b2d25012e884897f970f5916
pullPolicy: Always
ports:
container: 8090
livenessProbe:
initialDelaySeconds: 6
tcpSocket:
port: 8090
resources:
requests:
memory: 128Mi
cpu: 50m
limits:
memory: 128Mi
cpu: 100m
- repo: myrepo/qa/helloworld2
tag: 6bb39948f2a5f926f7968480435ec39a4e07e721
pullPolicy: Always
ports:
container: 8080
livenessProbe:
initialDelaySeconds: 6
tcpSocket:
port: 8080
resources:
requests:
memory: 128Mi
cpu: 50m
limits:
memory: 128Mi
cpu: 100m

Answer 1

That depends on your helm chart. The reason you can pass the image.tag and image.repository sections is because inside of the helm chart templates there is a section specifying the following:
containers:
- image: {{ .Values.image.repository }}/app-name:{{ .Values.image.tag }}
Helm templates a deployment.yaml. By default it replaces each of the Values in a chart with whatever defaults where specified in the values.yaml file that is part of that chart. Whenever you run a helm command such as helm install or helm upgrade --install and specify the --set flag, you are overriding the defaults specified in the values.yaml. See the docs on helm upgrade for more info on overriding the values in a chart.
To answer your question: it depends on how that chart is defined. What you often see is that in the values.yaml of a multi-container pod you define two sets of images, e.g.:
# values.yaml
image1:
tag: <sha-here>
repository: <repo-here>
image2:
tag: <sha-here>
repository: <repo-here>
and in the chart you can then refer to those values by specifying:
containers:
- image: {{ .Values.image1.repository }}/app-name:{{ .Values.image1.tag }}
However, it depends on your specific Helm chart where you specify these values. Are you able to update your Helm Chart? Or is it an external Chart?