I have a requirement to pass cluster, namespace and pod name to AppDynamics agent from my container deployed in Kubernetes cluster.
I tried something as below, but that does not work.
containers:
- env:
- name: JAVA_OPTS
value: -Dappdynamics.agent.nodeName=$HOST-$spec.nodeName-spec.PodName
and
- name: appdynamics.agent.nodeName
value= $HOST-$spec.nodeName-spec.PodName
Could anyone please help me here how to collect the detail and pass to AppD. Thanks in advance.
Below format helped me, suggested by ewok2030 and Praveen. Only one thing to make sure that the variable should be declared before they are used as JAVA_OPTS.
containers:
- env:
- name: APPD_NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: APPD_POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: APP_POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: JAVA_OPTS
value: -Xmx712m -Xms556m -Dpdp.logging.level=WARN -Dappdynamics.agent.nodeName=$(APPD_NODE_NAME)-$(APPD_POD_NAMESPACE)-$(APP_POD_NAME)
You can get POD_NAME
and POD_NAMESPACE
passing them as environment variables via fieldRef
.
apiVersion: v1
kind: Pod
metadata:
name: test-env
spec:
containers:
- name: test-container
image: my-test-image:latest
env:
- name: MY_NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: MY_POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: MY_POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: MY_POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: MY_POD_SERVICE_ACCOUNT
valueFrom:
fieldRef:
fieldPath: spec.serviceAccountName
- name: REFERENCE_EXAMPLE
value: "/$(MY_NODE_NAME)/$(MY_POD_NAMESPACE)/$(MY_POD_NAME)/data.log"
restartPolicy: Never
EDIT: Added example env REFERENCE_EXAMPLE
to show how to reference variables. Thanks to this answer for pointing out the $()
interpolation.
You can reference supports metadata.name, metadata.namespace, metadata.labels, metadata.annotations, spec.nodeName, spec.serviceAccountName, status.hostIP, status.podIP
as mentioned in the documentation here.
However, CLUSTERNAME
is not a standard property available. According to this PR #22043, the CLUSTERNAME
should be injected to the .metadata
field if using GCE.
Otherwise, you'll have to specific the CLUSTERNAME
manually in the .metadata
field and then use fieldRef
to inject it as an environment variable.