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kube-gelf

Fluentd CoreOS Kubernetes container logs & journald log collector with Graylog output. Configurable through ConfigMap and with provided cron example to mitigate some fluentd bugs as well as providing option for config reloads

Notes

This project is automaticly built at Docker Hub

This image has only been tested with CoreOS but should work with any other distribution as long as the paths in fluent.conf & the daemonset is adjusted accordingly.

Installation

kubectl create -f rbac.yaml

kubectl create configmap \
    --namespace kube-system kube-gelf \
    --from-file fluent.conf \
    --from-literal GELF_HOST=<server address> \
    --from-literal GELF_PORT=12201 \
    --from-literal GELF_PROTOCOL=<udp|tcp>

kubectl create -f daemonset.yaml

# optional, see notes below
kubectl create -f cron.yaml

After updating the configmap reloading fluentd config on all pods can be done with kubectl access. Please allow atleast a minute to pass before issuing the command due to Kubernetes not real-time syncing configmap updates to volumes.

for POD in `kubectl get pod --namespace kube-system -l app=kube-gelf | tail -n +2 | awk '{print $1}'`; do echo RELOAD ${POD}; kubectl exec --namespace kube-system ${POD} -- /bin/sh -c 'kill -1 1'; done

Cron

As of Kubernetes 1.8 batch/v1beta1 is enabled by default and no additional changes are needed.

If you are on < 1.8:

Enable batch/v2alpha1=true in the apiserver(s) --runtime-config= & restart apiservers + controller-manager. Also change the apiVersion from batch/v1beta1 to batch/v2alpha1

The cron.yaml can be used to deploy a cronJob that periodicly tells kube-gelf to reload it's configuration to also works around some fluend bugs.

I have several images made for different Kubernetes versions and you could adapt your cron.yaml by using any of my avail image tags here: https://hub.docker.com/r/roffe/kubectl/tags/

Fluentd Bugs

in_tail prevents docker from removing container https://github.com/fluent/fluentd/issues/1680.

in_tail removes untracked file position during startup phase. It means the content of pos_file is growing until restart when you tails lots of files with dynamic path setting. I will fix this problem in the future. Check this issue. https://github.com/fluent/fluentd/issues/1126.

Changelog

1.2

1.1

Got rid of hostNetwork and added a NODENAME env variable utilizing the downward api. All log entries will contain the field hostname: <your nodename in kubernetes>

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CoreOS Kubernetes logging to Graylog

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