Kubernetes manifests
To simplify the deployment of our application, we have provided two configuration files which will create the necessary resources to run our application. These two files will consist of a Deployment and a Service and are available in the
./deployment directory of the accompanying GitHub repository. Let's take a look at what's in each of these configuration files.Deployment
A deployment will define the desired state and create a ReplicaSet. Here we are defining the container image we will use as well as
cpu and memory limits among other things.1
apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: goof
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: goof
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tier: frontend
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template:
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metadata:
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labels:
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app: goof
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tier: frontend
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spec:
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containers:
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- name: goof
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image: DOCKER_IMAGE_NAME
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resources:
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requests:
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cpu: 100m
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memory: 100Mi
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ports:
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- containerPort: 3001
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- containerPort: 9229
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env:
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- name: DOCKER
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value: "1"
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: goof-mongo
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: goof
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tier: backend
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template:
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metadata:
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labels:
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app: goof
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tier: backend
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spec:
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containers:
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- name: goof-mongo
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image: mongo
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ports:
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- containerPort: 27017
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Service
A service is an abstraction for exposing an application running on a set of Pods as a network service. Here, we are defining a two-tier application that consists of a
frontend which is our goof application s well as a backend which in our case will be a mongodb container image.1
apiVersion: v1
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kind: Service
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metadata:
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name: goof
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spec:
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type: LoadBalancer
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ports:
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- protocol: TCP
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port: 80
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targetPort: 3001
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name: "http"
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- protocol: TCP
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port: 9229
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targetPort: 9229
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name: "debug"
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selector:
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app: goof
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tier: frontend
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: goof-mongo
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spec:
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ports:
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- protocol: TCP
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port: 27017
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targetPort: 27017
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name: "mongo"
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selector:
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app: goof
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tier: backend
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