Converting docker-compose to a helm chart? - docker

Question

I have a docker-compose file containing 2 images to a security tool I am using. My challenge is to convert it into helm chart consisting of deployment.yaml and service.yaml. The docker-compose looks like this -
version: '3'
services:
nginx:
ports:
- "80:80"
- "443:443"
environment:
- NG_SERVER_NAME=192.168.1.228
links:
- tomcat8
image: continuumsecurity/iriusrisk-prod:nginx-prod-ssl
container_name: iriusrisk-nginx
volumes:
- "./cert.pem:/etc/nginx/ssl/star_iriusrisk_com.crt"
- "./key.pem:/etc/nginx/ssl/star_iriusrisk_com.key"
tomcat8:
environment:
- IRIUS_DB_URL=jdbc\:postgresql\://192.168.1.228\:5432/iriusprod?user\=iriusprod&password\=alongandcomplexpassword2523
- IRIUS_EDITION=saas
- IRIUS_EXT_URL=http\://192.168.1.228
- grails_env=production
image: continuumsecurity/iriusrisk-prod:tomcat8-2
container_name: iriusrisk-tomcat8
There is a postgres server running too which I am able to convert into a helm chart and expose it to my ip (192.168.1.228) on port 5432. But for the iriusrisk and tomcat image which are linked to each other, I am not able to it figure out. This has been my solution for the deployment file for both.
deployment-tomcat.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: tomcat
labels:
app: {{ .Values.tomcat.app.name }}
spec:
replicas: {{ .Values.tomcat.replicas }}
selector:
matchLabels:
app: {{ .Values.tomcat.app.name }}
template:
metadata:
labels:
app: {{ .Values.tomcat.app.name }}
spec:
{{- if .Values.tomcat.imagePullSecretsName }}
imagePullSecrets:
- name: {{ .Values.tomcat.imagePullSecretsName }}
{{- end}}
restartPolicy: Always
serviceAccountName: {{ .Values.tomcat.serviceAccountName }}
containers:
- name: {{ .Values.tomcat.app.name }}
image: "{{ .Values.tomcat.ImageName }}:{{ .Values.tomcat.ImageTag }}"
container_name: iriusrisk-tomcat8
imagePullPolicy: {{ .Values.tomcat.ImagePullPolicy }}
ports:
- containerPort: {{ .Values.tomcat.port }}
env:
- name: IRIUS_DB_URL
value: jdbc\:postgresql\://192.168.1.228\:5432/iriusprod?user\=iriusprod&password\=alongandcomplexpassword2523
- name: IRIUS_EDITION
value: saas
- name: IRIUS_EXT_URL
value: http\://192.168.1.228
- name: grails_env
value: production
deployment-iriusrisk.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: iriusrisk
labels:
app: {{ .Values.iriusrisk.app.name }}
spec:
replicas: {{ .Values.iriusrisk.replicas }}
selector:
matchLabels:
app: {{ .Values.iriusrisk.app.name }}
template:
metadata:
labels:
app: {{ .Values.iriusrisk.app.name }}
spec:
{{- if .Values.iriusrisk.imagePullSecretsName }}
imagePullSecrets:
- name: {{ .Values.iriusrisk.imagePullSecretsName }}
{{- end}}
restartPolicy: Always
serviceAccountName: {{ .Values.iriusrisk.serviceAccountName }}
containers:
- name: {{ .Values.iriusrisk.app.name }}
image: "{{ .Values.iriusrisk.ImageName }}:{{ .Values.iriusrisk.ImageTag }}"
container_name: iriusrisk-nginx
imagePullPolicy: {{ .Values.iriusrisk.ImagePullPolicy }}
ports:
- containerPort: {{ .Values.iriusrisk.port }}
env:
- name: NG_SERVER_NAME
value: "192.168.1.228"
volumes:
- "./cert.pem:/etc/nginx/ssl/star_iriusrisk_com.crt"
- "./key.pem:/etc/nginx/ssl/star_iriusrisk_com.key"
How should I go around solving this issue? I have looked at "linking" pods with each other but none of the solutions I tried worked. I am bit new to this hence I am still a bit confused about how to expose pods and connect to each other.

Answer 1

The kompose tool now includes the ability to convert to Helm charts from docker-compose.yml files:
kompose convert -c
Check out the kompose Alternative Conversions documentation (also here).

Answer 2

From my current knowledge, there is no such tool is developed or published that converts helm-chart into docker-compose file. But the conversion from docker-compose to kubernetes resource manifests can be done by using tool like kompose (https://kompose.io).

Answer 3

I think it is not necessary to convert from helm chart to docker-compose. You can use Minikube to run whatever is needed locally. Otherwise, the other alternative is to run your containers locally and reverse engineer. i.e. produce the docker compose file. Here is a link to GitHub that does this for you https://github.com/Red5d/docker-autocompose.
Good Luck