prompter: Write a k8s deployment file that creates an Nginx instance with two replicas. Then, exposes the deployment using a node port type service on port 30080.

assistant: Here's a sample Kubernetes deployment YAML file that creates an Nginx instance with two replicas and exposes the deployment using a NodePort type service on port 30080:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  type: NodePort
  selector:
    app: nginx
  ports:
  - name: http
    port: 80
    targetPort: 80
    nodePort: 30080

Within this YAML file, we first define a deployment named nginx-deployment that creates two replicas of an Nginx container. The selector field in the deployment spec matches the app: nginx labels on the pod template. The template field defines the pod template that specifies the Nginx container with a container port of 80.

Next, we define a NodePort type service named nginx-service that exposes the Nginx deployment on port 30080. The selector field in the service spec matches the app: nginx labels on the pod template. The ports field specifies the port mappings for the service, including the target port of 80 for the Nginx container and the node port of 30080 that will be used to access the service from outside the cluster.

assistant: Here is an example deployment that creates an Nginx instance with two replicas and exposes the deployment using a node port type service on port 30080:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:latest
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  type: NodePort
  selector:
    app: nginx
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
      nodePort: 30080

prompter: What variable would I rename if I wanted to call these deployments a custom name?

assistant: If you want to rename the deployments to a custom name, you would need to update the 'name' field in the 'metadata' section of both the Deployment and Service resources.

assistant: If you wanted to call these deployments a custom name, you would rename the metadata.name variable in both the Deployment and the Service objects. For example, if you wanted to call them my-nginx, you would change the following lines:

metadata: name: nginx-deployment

to

metadata: name: my-nginx-deployment

and

metadata: name: nginx-service

to

metadata: name: my-nginx-service

assistant: The Deployments API allows you to specify arbitrary metadata for each deployment in your application by providing key value pairs as part of the metadata object when creating or updating your Deployment resource. The metadata keys can be used by tools like kubectl describe or kubectx describe and may also be displayed when viewing resource information in kubectl or kubectx info output respectively. For example, if you wanted to rename one or more deployments from "nginx" to "my cool app", you could do so by running something like this command for each deployment you want modified (replace "nginx" with whatever name you want)

assistant: Here's a Kubernetes deployment and service that will do what you described:
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

prompter: Please describe each step you made.

assistant: Certainly! Here's a breakdown of the steps involved in creating the Kubernetes deployment and service file:

1. We start by specifying the API version of the Kubernetes resources we are going to create. In this case, we are using the apps/v1 API version, which provides a stable interface for managing deployments.
2. Next, we define the kind of resource we want to create, which is a Deployment. Deployments are used to manage replicas of a set of pods.
4. We add some metadata to the deployment, including a name for the deployment.
5. We specify the desired number of replicas we want to run for the deployment. In this case, we want two replicas.
6. We define a selector that will be used to match pods to the deployment. The selector specifies that any pods with the label app=nginx will be managed by this deployment.
7. We define a template for the pods that will be created by the deployment. The template includes labels that will be used to match the pods to the deployment, as well as container specifications for the pod. In this case, we specify that we want to use the nginx container image with version 1.7.9, and that the container should listen on port 80.
8. Finally, we create a service that will expose the deployment to the outside world. We use the NodePort service type, which allows us to map a port on each node in the cluster to a port on the service. In this case, we map port 30080 on the nodes to port 80 on the pods managed by the service.

I hope that helps! Let me know if you have any more questions.

assistant: To create an Nginx instance with two replicas, I wrote a Kubernetes deployment file that specified the desired replicas and provided the deployment configuration. I then created a service of type NodePort to expose the deployment on port 30080. The NodePort type will expose the deployment on the specified port on all of the nodes in the cluster.

prompter: Now change it so the Ingresses use HostPort instead of NodePort