Docker Notes 2

Docker Orchestration
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Kubernetes
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Takes declared state, and works to make that happen across a cluster.

Node - 'kubelet' runs pods and talks 2 master. Node = Computer
Pod - runs 1+ containers, exists on node
Service - handles requests using LB
Deployment - defines desired state

Replication Controller - manages deployment state, ensures health, maintains history, 

Deployment Yamls specify spec for kubernetes deployment.

ports section
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port -> accessible port within the cluster
*targetPort* -> Port that a request on 8080 from within the cluster gets forwarded to. 
nodePort -> Port thats accessible outside the cluster, it gets mapped to 'port' as well

replicas specify the number of pods
kubernetes automatically replaces failed hardware - even if its a manual action. 





minikube start
kubectl get pods
kubectl get deployments
minikube dashboard

TODO
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Install Minikube (GUI)
Get DockerHub Account

Links
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https://nodejs.org/en/docs/guides/nodejs-docker-webapp/
https://www.youtube.com/watch?v=1xo-0gCVhTU