Sample Deployment Of Django Application With:

• Redis
• Postgres
• Persistent Volumes (use local mount path)

Basically a 3 django application container is runing behind a LoadBalancer. So, to get a service list: make list_svc And make sure, a minikube tunnel is started with minikube tunnel

Start Minikube Tunnel

> minikube tunnel

Status:	
	machine: minikube
	pid: 229645
	route: 10.96.0.0/12 -> 192.168.39.66
	minikube: Running
	services: [webapp-svc]
    errors: 
		minikube: no errors
		router: no errors
		loadbalancer emulator: no errors

It says that, the cluster CIDR 10.96.0.0/12 is routed to 192.168.39.66 on host machine.

Get LoadBalancer Port Mapping For Host Machine

> make list_svc

NAME           TYPE           CLUSTER-IP       EXTERNAL-IP      PORT(S)          AGE
postgres-svc   ClusterIP      10.104.163.24    <none>           5432/TCP         17m
redis-svc      ClusterIP      10.108.160.127   <none>           6379/TCP         17m
webapp-svc     LoadBalancer   10.103.163.110   10.103.163.110   8000:31073/TCP   17m

webapp-svc is runing on port 8000 on container, and its port is mapped to 31073. So, the application is accessible at:

http://192.168.39.66:31073

Make Commands:

• Create resources: make run

• Destroy resources: make destroy

• List Services: make list_svc

• List ReplicaSets: make list_rc

• List Deployments: make list_dep

• List Deployments: make list_dep

• List PersistentVolumes: make list_pv

• List PersistentVolumesClaims: make list_pvc

• List Pods: make list_pods

• Drop shell context into pods: make exec POD=<pod_name>

• Watch Logs: make watch_logs POD=<pod_name>

• Rollout Deployment: make rollout_deployment

Note: if any changes is done to ConfigMap values, make sure fresh deployment is rolled out with make rollout_deployment.

Volumes are mounted insde: /mnt/ in the minikube. To view volumes:

• SSH into minikube: minikube ssh
• CD into mount path: /mnt

Runing CI With Jenkins:

Pipeline Written in Jenkinsfile

Since this requires access to docker and kubernetes. User jenkins should be added to docker group.

sudo usermod -aG docker jenkins

Reffer Working of Jenkins Pipeline for more detail intro on what needs to be done with jenkins.

References:

• CreateContainerConfigError

• Kubernetes Resource Creation

• Persistent Volume Creation With Minikube

• Handy Commands

• Jenkins Docker Build Permission Issue

• Working of Jenkins Pipeline