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Comparing Pods, ReplicaSets, and services#

Sumit Rawal answered on June 23, 2023 Popularity 1/10 Helpfulness 1/10

answer Comparing Pods, ReplicaSets, and services#

Comparing Pods, ReplicaSets, and services#

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Starting from this chapter, we’ll compare each Kubernetes feature with Docker Swarm equivalents. That way, Swarm users can have a smoother transition into Kubernetes or, depending on their goals, choose to stick with Swarm.

Please bear in mind that the comparisons will be made only for a specific set of features. You will not (yet) be able to conclude whether Kubernetes is better or worse than Docker Swarm. You’ll need to grasp both products in their entirety to make an educated decision. The comparisons like those that follow are useful only as a base for more detailed examinations of the two products.

Docker swarm vs Kubernetes

For now, we’ll limit the comparison scope to Pods, ReplicaSets, and Services on the one hand, and Docker Service stacks, on the other.

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: go-demo-2-db
spec:
  selector:
    matchLabels:
      type: db
      service: go-demo-2
  template:
    metadata:
      labels:
        type: db
        service: go-demo-2
    spec:
      containers:
      - name: db
        image: mongo:3.3
        ports:
        - containerPort: 28017

---

apiVersion: v1
kind: Service
metadata:
  name: go-demo-2-db
spec:
  ports:
  - port: 27017
  selector:
    type: db
    service: go-demo-2

---

apiVersion: apps/v1beta2
kind: ReplicaSet
metadata:
  name: go-demo-2-api
spec:
  replicas: 3
  selector:
    matchLabels:
      type: api
      service: go-demo-2
  template:
    metadata:
      labels:
        type: api
        service: go-demo-2
    spec:
      containers:
      - name: api
        image: vfarcic/go-demo-2
        env:
        - name: DB
          value: go-demo-2-db
        readinessProbe:
          httpGet:
            path: /demo/hello
            port: 8080
          periodSeconds: 1
        livenessProbe:
          httpGet:
            path: /demo/hello
            port: 8080

---

apiVersion: v1
kind: Service
metadata:
  name: go-demo-2-api
spec:
  type: NodePort
  ports:
  - port: 8080
  selector:
    type: api
    service: go-demo-2

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Contributed on Jun 23 2023

Sumit Rawal

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Comparing Pods, ReplicaSets, and services#

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