Sidecar proxy concept (Envoy) in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add Envoy as a sidecar container in a Kubernetes Pod spec.

Kubernetes

containers:
  - name: app-container
    image: myapp:latest
  - name: envoy-proxy
    image: [1]

Drag options to blanks, or click blank then click option'

Abusybox

Bnginx:latest

Credis:alpine

Denvoyproxy/envoy:v1.22.0

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated container images like nginx or redis for Envoy.

The Envoy sidecar container uses the official Envoy image envoyproxy/envoy:v1.22.0 to run the proxy alongside the app container.

2fill in blank

medium

Complete the Envoy container spec to expose the admin interface on port 9901.

Kubernetes

containers:
  - name: envoy-proxy
    image: envoyproxy/envoy:v1.22.0
    ports:
      - containerPort: [1]

Drag options to blanks, or click blank then click option'

A8080

B9901

C443

D15000

Attempts:

3 left

💡 Hint

Common Mistakes

Using port 8080 or 443 which are common for app traffic, not admin.

Envoy's admin interface commonly listens on port 9901, which helps in monitoring and debugging.

3fill in blank

hard

Fix the error in the Envoy sidecar container args to specify the config file path.

Kubernetes

containers:
  - name: envoy-proxy
    image: envoyproxy/envoy:v1.22.0
    args: ["-c", [1]]

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A'/etc/envoy/envoy.yaml'

B/etc/envoy/envoy.yaml

C"/etc/envoy/envoy.yaml"

D/etc/envoy/envoy.yml

Attempts:

3 left

💡 Hint

Common Mistakes

Missing quotes causing YAML parsing errors.

Using wrong file extension '.yml' instead of '.yaml'.

The argument value must be a string with quotes inside the YAML list, so use double quotes inside the array.

4fill in blank

hard

Fill both blanks to define a Kubernetes Pod annotation and Envoy container env var for proxying.

Kubernetes

metadata:
  annotations:
    sidecar.istio.io/inject: [1]
containers:
  - name: envoy-proxy
    env:
      - name: PROXY_MODE
        value: [2]

Drag options to blanks, or click blank then click option'

A"false"

B"true"

C"default"

D"enabled"

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'true' and 'false' for injection.

Using incorrect env var values.

The annotation disables sidecar injection with "false", and the Envoy proxy mode is set to "default".

5fill in blank

hard

Fill all three blanks to create an Envoy bootstrap config map with keys for node id, cluster, and admin port.

Kubernetes

apiVersion: v1
kind: ConfigMap
metadata:
  name: envoy-bootstrap
data:
  node_id: [1]
  cluster: [2]
  admin_port: "[3]"

Drag options to blanks, or click blank then click option'

A"sidecar~10.0.0.1~pod-123~default.svc.cluster.local"

B"service-cluster"

C9901

D15090

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port numbers or missing quotes for strings.

The node_id is a unique Envoy identifier, the cluster name is 'service-cluster', and the admin port is set to '9901'.