Cannot add linkerd inject annotation in deployment file - kubernetes

Question

I have a kubernetes deployment file user.yaml -
apiVersion: apps/v1
kind: Deployment
metadata:
name: user-deployment
namespace: stage
spec:
replicas: 1
selector:
matchLabels:
app: user
template:
metadata:
labels:
app: user
annotations:
prometheus.io/scrape: 'true'
prometheus.io/port: '9022'
spec:
nodeSelector:
env: stage
containers:
- name: user
image: <docker image path>
imagePullPolicy: Always
resources:
limits:
memory: "512Mi"
cpu: "250m"
requests:
memory: "256Mi"
cpu: "200m"
ports:
- containerPort: 8080
env:
- name: MODE
value: "local"
- name: PORT
value: ":8080"
- name: REDIS_HOST
value: "xxx"
- name: KAFKA_ENABLED
value: "true"
- name: BROKERS
value: "xxx"
imagePullSecrets:
- name: regcred
---
apiVersion: v1
kind: Service
metadata:
namespace: stage
name: user
spec:
selector:
app: user
ports:
- protocol: TCP
port: 8080
targetPort: 8080
---
apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
name: user
namespace: stage
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: user-deployment
minReplicas: 1
maxReplicas: 10
metrics:
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: 50
- type: Resource
resource:
name: memory
target:
type: AverageValue
averageValue: 300Mi
This deployment is already running with linkerd injected with command cat user.yaml | linkerd inject - | kubectl apply -f -
Now I wanted to add linkerd inject annotation (as mentioned here) and use command kubectl apply -f user.yaml just like I use for a deployment without linkerd injected.
However, with modified user.yaml (after adding linkerd.io/inject annotation in deployment) -
apiVersion: apps/v1
kind: Deployment
metadata:
name: user-deployment
namespace: stage
spec:
replicas: 1
selector:
matchLabels:
app: user
template:
metadata:
labels:
app: user
annotations:
prometheus.io/scrape: 'true'
prometheus.io/port: '9022'
linkerd.io/inject: enabled
spec:
nodeSelector:
env: stage
containers:
- name: user
image: <docker image path>
imagePullPolicy: Always
resources:
limits:
memory: "512Mi"
cpu: "250m"
requests:
memory: "256Mi"
cpu: "200m"
ports:
- containerPort: 8080
env:
- name: MODE
value: "local"
- name: PORT
value: ":8080"
- name: REDIS_HOST
value: "xxx"
- name: KAFKA_ENABLED
value: "true"
- name: BROKERS
value: "xxx"
imagePullSecrets:
- name: regcred
---
apiVersion: v1
kind: Service
metadata:
namespace: stage
name: user
spec:
selector:
app: user
ports:
- protocol: TCP
port: 8080
targetPort: 8080
---
apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
name: user
namespace: stage
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: user-deployment
minReplicas: 1
maxReplicas: 10
metrics:
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: 50
- type: Resource
resource:
name: memory
target:
type: AverageValue
averageValue: 300Mi
When I run kubectl apply -f user.yaml, it throws error -
service/user unchanged
horizontalpodautoscaler.autoscaling/user configured
Error from server (BadRequest): error when creating "user.yaml": Deployment in version "v1" cannot be handled as a Deployment: v1.Deployment.Spec: v1.DeploymentSpec.Template: v1.PodTemplateSpec.Spec: v1.PodSpec.Containers: []v1.Container: v1.Container.Env: []v1.EnvVar: v1.EnvVar.v1.EnvVar.Value: ReadString: expects " or n, but found 1, error found in #10 byte of ...|,"value":1},{"name":|..., bigger context ...|ue":":8080"}
Can anyone please point out where I have gone wrong in adding annotation?
Thanks

Answer 1

Try with double quotes like below
annotations:
prometheus.io/scrape: "true"
prometheus.io/port: "9022"
linkerd.io/inject: enabled