fluentd liveness and readiness probe

[Nicolas Pepinster]

Hello,

I'm trying to configure liveness and readiness probe for fluentd docker image deployed on Openshift (Kubernetes).

 

I configured a monitor_agent source in order to define livesness/readiness based on http get request.

Unfortunately, it seems that the API only show plugin metrics, not metric from the agent itself.

My approach is probably not the better... What do you think is the best way to know if the fluentd process is up & running ?

The kubernetes documentation shows that it's possible to define probes based on bash command. This alternative is maybe a better way that the monitor_agent one.

I'll glad to read your advice.

Thanks in advance

[Mr. Fiber]

>  it seems that the API only show plugin metrics, not metric from the agent itself.

What is your purpose?

Do you want to know fluentd is running or not, or fluentd's plugin is running or not?

Masahiro

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[Nicolas Pepinster]

Hello,

My purpose is to be able to know if fluentd is running and working.

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[Nicolas Pepinster]

For info, I used process monitoring as described https://docs.fluentd.org/v0.12/articles/monitoring#process-monitoring

I deploy https://hub.docker.com/r/fluent/fluentd/ on Kubernetes with these two probes :

        livenessProbe:
          exec:
            command:
            - "/bin/sh"
            - "-c"
            - "[[ $( pgrep ruby | wc -l)  == 2 ]]"
          initialDelaySeconds: 300
          periodSeconds: 20
        readinessProbe:
          exec:
            command:
            - "/bin/sh"
            - "-c"
            - "[[ $( pgrep ruby | wc -l)  == 2 ]]"
          initialDelaySeconds: 45
          periodSeconds: 5

Hope this can help somebody else

[Chris Knowles]

https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-gcp/fluentd-gcp-ds.yaml#L58 may also be helpful although it does not detect all fluentd problems.