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Converting from Docker-Compose
The first step will be to install kompose and convert our docker-compose.yml to kubernetes yaml files.
Install kompose
> brew install kompose
Startup without Converting
For simple docker-compose files, we can skip the steps pf converting and start up directly using kompose up.
> kompose up
Exporting
For more complicated docker-compose files, we will need to export and then modify the converted files.
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$ kompose convert WARN Volume mount on the host "/Users/john.mehan/projects/cloud/deployment/is-config/IND" isn't supported - ignoring path on the host INFO Kubernetes file "cloudservice-service.yaml" created INFO Kubernetes file "isservice-service.yaml" created INFO Kubernetes file "postgres-service.yaml" created INFO Kubernetes file "redis-service.yaml" created INFO Kubernetes file "cloudservice-deployment.yaml" created INFO Kubernetes file "isservice-deployment.yaml" created INFO Kubernetes file "isservice-claim0-persistentvolumeclaim.yaml" created INFO Kubernetes file "postgres-deployment.yaml" created INFO Kubernetes file "db-volume-persistentvolumeclaim.yaml" created INFO Kubernetes file "redis-deployment.yaml" created |
Create Kubernetes pods in Cluster
We are using minkube for our cluster. Lets start by making sure it is running:
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$ kubectl create -f cloudservice-service.yaml,isservice-service.yaml,postgres-service.yaml,redis-service.yaml,cloudservice-deployment.yaml,isservice-deployment.yaml,isservice-claim0-persistentvolumeclaim.yaml,postgres-deployment.yaml,db-volume-persistentvolumeclaim.yaml,redis-deployment.yaml service/cloudservice created service/isservice created service/postgres created service/redis created deployment.extensions/cloudservice created deployment.extensions/isservice created persistentvolumeclaim/isservice-claim0 created deployment.extensions/postgres created persistentvolumeclaim/db-volume created deployment.extensions/redis created |
Pulling image from Docker Registry
Kubernetes will pull docker images from docker hub by default. For our own custom images, we will pull them from our local docker registry.
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- create a secret in the cluster that holds our authorization token
- update our deployment yaml files to include this secret
- setup an ssh tunnel between our localhost running docker registry and our cluster (minikube)
Create a Secret in the cluster that holds your authorization token
> kubectl create secret docker-registry regcred --docker-server=<your-registry-server> --docker-username=<your-name> --docker-password=<your-pword> --docker-email=<your-email>
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$ kubectl create secret docker-registry regcred --docker-server=http://localhost:5000/ --docker-username=username --docker-password=password --docker-email=john.mehan@irdeto.com secret/regcred created |
Revise deployment.yaml files
Add imagePullSecrets section to your deployment yaml files:
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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
...
spec:
replicas: 1
strategy:
type: Recreate
template:
metadata:
creationTimestamp: null
labels:
io.kompose.service: isservice
spec:
containers:
- image: localhost:5000/safa_is:0.1
name: isservice
ports:
- containerPort: 8080
resources: {}
tty: true
volumeMounts:
- mountPath: /home/irdeto/CONF/ISF/IND
name: is-volume
restartPolicy: Always
volumes:
- name: is-volume
persistentVolumeClaim:
claimName: is-volume
imagePullSecrets:
- name: regcred
status: {} |
Setup SSH Tunnel
We will setup an SSH Tunnel in order to allow kubernetes to pull images from our local docker registry.
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$ ssh -i ~/.minikube/machines/minikube/id_rsa docker@$(minikube ip) -R 5000:localhost:5000 |
Expose our Services
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$ kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE cloudservice ClusterIP 10.107.194.8 <none> 80/TCP 1h ... $ kubectl expose deployment cloudservice --type=LoadBalancer --name=cloud $ kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE cloud LoadBalancer 10.105.4.92 <pending> 8080:31500/TCP 23m cloudservice ClusterIP 10.107.194.8 <none> 80/TCP 1h ... |
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$ minikube service cloud |
References
| Reference | URL |
|---|---|
| Translate docker compose to Kubernetes | https://kubernetes.io/docs/tasks/configure-pod-container/translate-compose-kubernetes/ |
| Kotacoda Kubernetes Playground | https://www.katacoda.com/courses/kubernetes/playground |
| Pull an image from a Private Registry | https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/ |
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