I use Kompose to convert docker-compose to Kubernetes files. When I used images runned on Docker (no Kubernetes), it used postgres volume to have persistent data. Now, with the same docker-compose, if I run with Kubernetes using the file created with Kompose, every time I launch Kubernetes the database is empty. How is this possible? If I look at Docker Desktop, in fact, I see that the volumes do not have the tag "IN USE".
How do I do that?
Thank you in advance!
docker-compose.yaml:
version: '3'
services:
eureka-server:
image: com.petcare/eureka-server:0.0.1-SNAPSHOT
container_name: eureka-server
expose:
- 8761
auth-service:
image: com.petcare/auth-service:0.0.1-SNAPSHOT
container_name: auth-service
expose:
- 8081
depends_on:
- eureka-server
- postgresqldb
map-service:
image: com.petcare/map-service:0.0.1-SNAPSHOT
container_name: map-service
expose:
- 8082
depends_on:
- eureka-server
- postgresqldb
reservation-service:
image: com.petcare/reservation-service:0.0.1-SNAPSHOT
container_name: reservation-service
expose:
- 8083
depends_on:
- eureka-server
- postgresqldb
user-service:
image: com.petcare/user-service:0.0.1-SNAPSHOT
container_name: user-service
expose:
- 8084
depends_on:
- eureka-server
- postgresqldb
api-gateway:
image: com.petcare/api-gateway:0.0.1-SNAPSHOT
container_name: api-gateway
expose:
- 8080
depends_on:
- eureka-server
labels:
kompose.service.type: NodePort
kompose.service.nodeport.port: "30000"
postgresqldb:
image: postgres
container_name: postgres
ports:
- "5432:5432"
environment:
- POSTGRES_PASSWORD=postgres
- POSTGRES_USER=postgres
- POSTGRES_DB=websitepetcare
volumes:
- database-data:/var/lib/postgresql/data/
labels:
kompose.service.type: NodePort
kompose.service.nodeport.port: "30002"
pgadmin:
container_name: pgadmin4_container
image: dpage/pgadmin4
environment:
PGADMIN_DEFAULT_EMAIL: [email protected]
PGADMIN_DEFAULT_PASSWORD: root
PGADMIN_LISTEN_PORT: 50
ports:
- "5050:50"
volumes:
- pgadmin-data:/var/lib/pgadmin
links:
- "postgresqldb:pgsql-server"
depends_on:
- postgresqldb
labels:
kompose.service.type: NodePort
kompose.service.nodeport.port: "30001"
volumes:
database-data:
external: true
pgadmin-data:
external: true
file created with kompose convert:
apiVersion: v1
items:
- apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
kompose.cmd: C:\ProgramData\chocolatey\lib\kubernetes-kompose\tools\kompose.exe convert -o kubernetes-services-deployments.yaml
kompose.service.nodeport.port: "30001"
kompose.service.type: NodePort
kompose.version: 1.26.0 (40646f47)
creationTimestamp: null
labels:
io.kompose.service: pgadmin
name: pgadmin
spec:
replicas: 1
selector:
matchLabels:
io.kompose.service: pgadmin
strategy:
type: Recreate
template:
metadata:
annotations:
kompose.cmd: C:\ProgramData\chocolatey\lib\kubernetes-kompose\tools\kompose.exe convert -o kubernetes-services-deployments.yaml
kompose.service.nodeport.port: "30001"
kompose.service.type: NodePort
kompose.version: 1.26.0 (40646f47)
creationTimestamp: null
labels:
io.kompose.service: pgadmin
spec:
containers:
- env:
- name: PGADMIN_DEFAULT_EMAIL
value: [email protected]
- name: PGADMIN_DEFAULT_PASSWORD
value: root
- name: PGADMIN_LISTEN_PORT
value: "50"
image: dpage/pgadmin4
name: pgadmin4-container
ports:
- containerPort: 50
resources: {}
volumeMounts:
- mountPath: /var/lib/pgadmin
name: pgadmin-data
restartPolicy: Always
volumes:
- name: pgadmin-data
persistentVolumeClaim:
claimName: pgadmin-data
status: {}
- apiVersion: v1
kind: PersistentVolumeClaim
metadata:
creationTimestamp: null
labels:
io.kompose.service: pgadmin-data
name: pgadmin-data
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 100Mi
status: {}
- apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
kompose.cmd: C:\ProgramData\chocolatey\lib\kubernetes-kompose\tools\kompose.exe convert -o kubernetes-services-deployments.yaml
kompose.service.nodeport.port: "30002"
kompose.service.type: NodePort
kompose.version: 1.26.0 (40646f47)
creationTimestamp: null
labels:
io.kompose.service: postgresqldb
name: postgresqldb
spec:
replicas: 1
selector:
matchLabels:
io.kompose.service: postgresqldb
strategy:
type: Recreate
template:
metadata:
annotations:
kompose.cmd: C:\ProgramData\chocolatey\lib\kubernetes-kompose\tools\kompose.exe convert -o kubernetes-services-deployments.yaml
kompose.service.nodeport.port: "30002"
kompose.service.type: NodePort
kompose.version: 1.26.0 (40646f47)
creationTimestamp: null
labels:
io.kompose.service: postgresqldb
spec:
containers:
- env:
- name: POSTGRES_DB
value: websitepetcare
- name: POSTGRES_PASSWORD
value: postgres
- name: POSTGRES_USER
value: postgres
image: postgres
name: postgres
ports:
- containerPort: 5432
resources: {}
volumeMounts:
- mountPath: /var/lib/postgresql/data/
name: database-data
restartPolicy: Always
volumes:
- name: database-data
persistentVolumeClaim:
claimName: database-data
status: {}
- apiVersion: v1
kind: PersistentVolumeClaim
metadata:
creationTimestamp: null
labels:
io.kompose.service: database-data
name: database-data
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 100Mi
status: {}
kind: List
metadata: {}
In a comment you write:
When I want to delete all, I run this command:
kubectl delete -f kubernetesFile.yamlWhen I start again all services with:
kubectl apply -f kubernetesFile.yamlI have the database empty.
The Kompose-converted kubernetesFile.yaml contains all of the Kubernetes resources, including the PersistentVolumeClaim that tells it to hold persistent data. So when you kubectl delete -f kubernetesFile.yaml, it deletes the PersistentVolumeClaim and the data, and then when you re-apply it, you get a new empty volume.
You don't need to run kubectl delete here. Just run kubectl apply -f kubernetesFile.yaml when your setup changes. Anything that's updated will be changed, and the cluster will delete and recreate Pods as needed. Anything that's not updated will stay unchanged. If you delete a Deployment or another resource you'll have to delete that by hand (kubectl delete deployment unused-deployment).