How to use multiple config files in a Kubernetes Telegraf pod

Telegraf
,
1

Hi there,

I am trying to include multiple configuration files in a telegraf pod in Kubernetes.
This is my current yaml file with one config file to deploy telegraf on Kubernetes and it works just fine.
But when I try to map multiple config files into the telegraf pod nothing works anymore.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: telegraf
spec:
  selector:
    matchLabels:
      app: telegraf
  minReadySeconds: 5
  template:
    metadata:
      labels:
        app: telegraf
    spec:
      containers:
        - image: telegraf:1.21.0
          name: telegraf
          volumeMounts:
            - mountPath: /etc/telegraf/telegraf.conf
              name: telegraf-config
              subPath: telegraf.conf
              readOnly: true
          envFrom:
            - secretRef:
                name: telegraf-secrets
      volumes:
        - name: telegraf-config
          configMap:
            name: telegraf-config

I created a configmap with “kubectl create configmap --from-file=/etc/telegraf/telegraf.d” and extended the yaml file above like this:

          volumeMounts:
            - name: telegraf-dir
              mountPath: /etc/telegraf/telegraf.d
              readOnly: true
      volumes:
        - name: telegraf-dir
          projected:
            sources:
            - configMap:
                name: telegraf-configs-dir

In fact the files get mapped into the pod but telegraf doesn’t use them.
I’d like to know if there is a way to map multiple config files into the telegraf pod.

Thanks for your help.

2

Hi,

The telegraf container does not use the /etc/telegraf/telegraf.d directory by default. You would need to add that as an option to your telegraf command to include --config-directory /etc/telegraf/telegraf.d

Let me know if that helps or if you are somehow running Telegraf differently such that it is already trying to include that folder.

3

Hi,

my yaml file looks like this, after I included the command:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: telegraf
spec:
  selector:
    matchLabels:
      app: telegraf
  minReadySeconds: 5
  template:
    metadata:
      labels:
        app: telegraf
    spec:
      containers:
        - image: telegraf:1.21
          name: telegraf
          args: ["--config-directory /etc/telegraf/telegraf.d"]
          volumeMounts:
            - mountPath: /etc/telegraf/telegraf.conf
              name: telegraf-config
              subPath: telegraf.conf
              readOnly: true
          volumeMounts:
            - name: telegraf-dir
              mountPath: /etc/telegraf/telegraf.d
              readOnly: true
          envFrom:
            - secretRef:
                name: telegraf-secrets
      volumes:
        - name: telegraf-config
          configMap:
            name: telegraf-config
      volumes:
        - name: telegraf-dir
          projected:
            sources:
            - configMap:
                name: telegraf-configs-dir

I tried to include it only with the args: lable and also with the command and the args lable.
In both scenarios the pod directly goes into completed state and after a few minutes it goes to CrashLoopBackOff.

When I don’t use the --config-directory flag the pod starts and keeps running but won’t send metrics to influx. Not even the main file will work, although it worked before I mapped the other config files into the config-folder.

I don’t know if it is possible to run telegraf in a pod with multiple config files or if my yaml file is just wrong.

4

You probably want to include the config file as well in your args.

Can you please get the logs from the container?

5

The logs from the container look like this:

image
image605×977 20.7 KB

6

Hi,

I found the problem and now it is working.
The problem was, that I had to pass the flag --config-directory as two arguments and you can use the keywords volumes and volumeMounts only once but you can specify more sources than one.

See the full yaml-file below:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: telegraf
spec:
  selector:
    matchLabels:
      app: telegraf
  minReadySeconds: 5
  template:
    metadata:
      labels:
        app: telegraf
    spec:
      containers:
        - image: telegraf:1.21.0
          name: telegraf
          args: ["--config-directory", "/etc/telegraf/telegraf.d"]
          volumeMounts:
            - mountPath: /etc/telegraf/telegraf.conf
              name: telegraf-config
              subPath: telegraf.conf
              readOnly: true
            - name:  telegraf-dir
              mountPath:  /etc/telegraf/telegraf.d
          envFrom:
            - secretRef:
                name: telegraf-secrets
      volumes:
        - name: telegraf-config
          configMap:
            name: telegraf-config
        - name: telegraf-dir
          configMap:
            name: telegraf-configs-dir