helm-chart-repository's Introduction

Helm Charts for Optima

We use Helm charts to deploy and manage our backend services on Kubernetes clusters.

General Helm Chart directory structure is as follows:

optima-chart
 ┣ templates
 ┃ ┣ tests
 ┃ ┃ ┗ test-connection.yaml
 ┃ ┣ deployment.yaml
 ┃ ┣ ingress.yaml
 ┃ ┣ NOTES.txt
 ┃ ┣ service.yaml
 ┃ ┗ _helpers.tpl
 ┣ .helmignore
 ┣ Chart.yaml
 ┗ values.yaml

Chart.yaml contains definitions required for the charts.
values.yaml contains variables required by the K8s manifests.
templates directory contains the K8s manifests i.e. deployment, service, ingress yamls, etc. and the template(.tpl) files
_helpers.tpl contains the template definitions for charts.

The repository contains the helm chart to deploy both node and spingboot micro-services.

Commands for Helm Charts

Installing the chart

helm install optima ./optima-charts

Listing installed charts

helm ls

Uninstalling the chart

helm uninstall optima

In the above, commands, optima is the release name of the deployed chart

Debugging the deployed resources using kubectl

In order to debug the deployed resources, we use these commands: get, describe and logs

Listing all resources in the current namespace
```
kubectl get all
```
Listing all resources of a kind
```
kubectl get <resource-kind>
```
where resource-kind can be deployment, pod, service, ingress, etc.
Retrieving detailed information about a resource
```
kubectl describe <resource-kind> <resource-name>
```
where resource-kind can be deployment, pod, service, ingress, etc. and resouce-name is the name of the said resource
Retrieving logs for a pod
```
kubectl logs <pod-name>
```
where pod-name is the name of the pod