Using InfluxDB for Horizaontal Pod AutoScaling using Custom Metrics - kubernetes

Question

I have the TICK stack deployed in my Kubernetes cluster for monitoring purposes. My application pushes its custom data to it.
I have tried horizontal pod autoscaling using custom metrics with the help of the Prometheus adapter. I was curious if there is such an adapter for InfluxDB as well?
The Kubernetes popular custom metrics adapters do not include the InfluxDB one. Is there a way I can use my current infrastructure(containing InfluxDB) to autoscale pods using custom metrics from my application?

Answer 1

Why not use custom metrics from Prometheus with influxdb-exporter? I don't see why it should not work.

Answer 2

It is possible to use influxdb with heapster, in attachments some files that I set up to use in an easy way.
First run influxdb.yaml
Run second heapster-rbac.yaml
Third run heapster.yaml
**INFLUXDB.YAML**
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: monitoring-influxdb
namespace: kube-system
spec:
replicas: 1
template:
metadata:
labels:
task: monitoring
k8s-app: influxdb
spec:
containers:
- name: influxdb
image: k8s.gcr.io/heapster-influxdb-amd64:v1.5.2
volumeMounts:
- mountPath: /data
name: influxdb-storage
volumes:
- name: influxdb-storage
emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
labels:
task: monitoring
# If you are NOT using this as an addon, you should comment out this line.
kubernetes.io/cluster-service: 'true'
kubernetes.io/name: monitoring-influxdb
name: monitoring-influxdb
namespace: kube-system
spec:
ports:
- port: 8086
targetPort: 8086
selector:
k8s-app: influxdb
**heapster-rbac.yaml**
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: heapster
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: heapster
namespace: kube-system
**heapster.yaml**
apiVersion: v1
kind: ServiceAccount
metadata:
name: heapster
namespace: kube-system
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: heapster
namespace: kube-system
spec:
replicas: 1
template:
metadata:
labels:
task: monitoring
k8s-app: heapster
spec:
serviceAccountName: heapster
containers:
- name: heapster
image: k8s.gcr.io/heapster-amd64:v1.5.4
imagePullPolicy: IfNotPresent
command:
- /heapster
- --source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250&insecure=true
- --sink=influxdb:http://monitoring-influxdb.kube-system.svc:8086
---
apiVersion: v1
kind: Service
metadata:
labels:
task: monitoring
# If you are NOT using this as an addon, you should comment out this line.
kubernetes.io/cluster-service: 'true'
kubernetes.io/name: Heapster
name: heapster
namespace: kube-system
spec:
ports:
- port: 80
targetPort: 8082
selector:
k8s-app: heapster

Answer 3

InfluxDB can be used with Heapster(as pointed out by #LucasSales) but it is deprecated in the current versions of Kubernetes.
For the latest versions of Kubernetes we have the metrics server for basic CPU/memory metrics. Prometheus is the accepted third party monitoring tool especially for things like custom metrics.