How to import an external file on k8 Manifest - docker

Question

I have a docker-compose.yml file that has my configuration on importing an external file that installs a postgis configuration when creating a docker image for Postgres,
This is the docker file
services:
postgres:
container_name: postgres_db
build:
context: .
dockerfile: Dockerfile-db
image: postgres
environment:
POSTGRES_USER: admin
POSTGRES_PASSWORD: password
PGDATA: /data/postgres
volumes:
- postgres:/data/postgres
ports:
- "5454:5454"
networks:
- postgres
the file am importing is called Dockerfile-db .
FROM postgres:14.1
RUN apt-get update && apt-get install -y postgresql-14-postgis-3
CMD ["/usr/local/bin/docker-entrypoint.sh","postgres"]
How can I do the same import on a K8 manifest file. this is where I add the database
spec:
serviceName: zone-service-db-service
selector:
matchLabels:
app: zone-service-db
replicas: 1
template:
metadata:
labels:
app: zone-service-db
spec:
tolerations:
- key: "podType"
operator: "Equal"
value: "isDB"
effect: "NoSchedule"
containers:
- name: postgres
image: postgres:latest
imagePullPolicy: "IfNotPresent"
ports:
- containerPort: 5432
envFrom:
- configMapRef:
name: zone-service-db
volumeMounts:
- mountPath: /var/lib/postgresql/data
name: postgredb
resources:
requests:
memory: '256Mi'
cpu: '100m'
limits:
memory: '256Mi'
volumes:
- name: postgredb
persistentVolumeClaim:
claimName: zone-service-pv-claim
How can I import the Dockerfile-db on the k8 manifest file and be called during the creating of the Postgres container and have the extensions available on the docker-image? Any help is appreciated

Answer 1

I believe you are getting this error
ERROR: type "geometry" does not exist
The file you have added above will mostly work with docker-compose but for Kubernetes, to have both Postgress and Postgis work together you will have to us the postgis image instead of the postgres image like this
spec:
serviceName: zone-service-db-service
selector:
matchLabels:
app: zone-service-db
replicas: 1
template:
metadata:
labels:
app: zone-service-db
spec:
tolerations:
- key: "podType"
operator: "Equal"
value: "isDB"
effect: "NoSchedule"
containers:
- name: postgres
image: postgis/postgis:latest
imagePullPolicy: "IfNotPresent"
ports:
- containerPort: 5432
envFrom:
- configMapRef:
name: zone-service-db
volumeMounts:
- mountPath: /var/lib/postgresql/data
name: postgredb
resources:
requests:
memory: '256Mi'
cpu: '100m'
limits:
memory: '256Mi'
volumes:
- name: postgredb
persistentVolumeClaim:
claimName: zone-service-pv-claim
Try this and advise. No need to import external files.