DevOps Classroom Series – 11/Apr/2021

A ConfigMap allows us to define application related data.
ConfigMap can be create through a literal value or from a file
Lets create a config map from literal values and mount it to the pod
Now lets create a pod which mounts the config map Refer Here for the changes and create the pod
Config maps can be mounted to the pods as volumes as well Refer Here
Secret is also much like config map but in secrets the values are base64 encoded
Kubernetes secretes has 3 available commands
- generic: generic secret holds any key value pair
- tls: secret for holding private-public key for communicating with TLS protocol
- docker-registry: This is special kind of secret that stores usernames and passwords to connect to private registries
Create a secret
Like configmap secrets also can be mounted as a volume

Cloud providers like AWS, Azure , Google offer kubernetes as a service
When we use these offerings
- Google Kuberenetes Engine
- Azure Kubernetes Services
- AWS Elastic Kubernetes Services
The cloud provider will manage
- the k8s master nodes
- the networking configuration
- Load balancing and ingress capabilities
- Persistent Volume native support to the clouds block and file storage
- Integrated logging and monitoring support

break till 7:25 PM

gcloud container clusters create gke-cluster --num-nodes=1 --region=us-central1

Now to configure the kubectl execute the get-credentials Refer Here
Now lets try to use the deployents and services created Refer Here
Lets wait till load balancer get the external ip and access the application using the load balancer external ip
k8s has create a loadbalancer in gcp
Now lets try to apply the web deployment
Lets try to create ingress loadbalancing using the examples Refer Here
For gcp lets apply the annotation as specified
Now lets try to create the persitent volume dynamically and use it for postgres volume Refer Here
To be shared
- manifest with correct annotations to run the ingress controller
- manifest to use postgres with gke persistent volumes
Refer Here for the pvc sample
note: Refer Here to understand the flow of the application creating the docker file and running it on k8s cluster.