blog-post-getting-rails-on-kubernetes

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Kubernetes master may also be a worker node and have pods scheduled to it.

kubectl get pods

kubectl describe pod [pod name] (also shows last event)

kubectl create -f ./some/path

kubectl apply -f ./some/path (to make changes)

kubectl port-forward [pod name] 3606:3606 (get access to it on your local machine)

kubectl delete job deploy-tasks

kubectl describe job deploy-tasks

kubectl attach (TODO - what is this?)

^{^some-commands}

livenessProbe and readynessProbe for health checks

In a deployment, nodeSelector will give you an affinity for a specific node-pool.

There is a load balancer service.

HorizontalPodAutoscaler

Within that file, there is an apiVersion: extensions/v1beta1

He creates a template that he pipes into kubectl (adds .tmpl suffix to the file). For that he uses envsubst in the gettext package.

In his script he uses jsonpath.

dd-agent kubernetes-docs-deamon-set spec - sends health of every node, pod, and kube-system service to Datadog

^{^dd-agent-and-daemon-set}

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