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79 lines
2.8 KiB
Markdown
79 lines
2.8 KiB
Markdown
# Stackdriver Logging Agent
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==============
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Stackdriver Logging Agent is a DaemonSet which spawns a pod on each node
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that reads logs, generated by kubelet, container runtime and containers
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and sends them to the Stackdriver. When logs are exported to the Stackdriver,
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they can be searched, viewed, and analyzed.
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Learn more at: https://kubernetes.io/docs/tasks/debug-application-cluster/logging-stackdriver
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## Troubleshooting
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In Kubernetes clusters in version 1.10.0 or later, fluentd-gcp DaemonSet can be
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manually scaled. This is useful e.g. when applications running in the cluster
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are sending a large volume of logs (i.e. over 100kB/s), causing fluentd-gcp to
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fail with OutOfMemory errors. Conversely, if the applications aren't generating
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a lot of logs, it may be useful to reduce the amount of resources consumed by
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fluentd-gcp, making these resources available to other applications. To learn
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more about Kubernetes resource requests and limits, see the official
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documentation ([CPU][cpu], [memory][memory]). The amount of resources requested
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by fluentd-gcp on every node in the cluster can be fetched by running following
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command:
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```
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$ kubectl get ds -n kube-system -l k8s-app=fluentd-gcp \
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-o custom-columns=NAME:.metadata.name,\
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CPU_REQUEST:.spec.template.spec.containers[].resources.requests.cpu,\
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MEMORY_REQUEST:.spec.template.spec.containers[].resources.requests.memory,\
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MEMORY_LIMIT:.spec.template.spec.containers[].resources.limits.memory
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```
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This will display an output similar to the following:
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```
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NAME CPU_REQUEST MEMORY_REQUEST MEMORY_LIMIT
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fluentd-gcp-v2.0.15 100m 200Mi 300Mi
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```
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In order to change those values, a [ScalingPolicy][scalingPolicy] needs to be
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defined. Currently, only base values are supported (no automatic scaling). The
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ScalingPolicy can be created using kubectl. E.g. to set cpu request to 101m,
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memory request to 150Mi and memory limit to 400Mi:
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```
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$ cat <<EOF | kubectl apply -f -
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apiVersion: scalingpolicy.kope.io/v1alpha1
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kind: ScalingPolicy
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metadata:
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name: fluentd-gcp-scaling-policy
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namespace: kube-system
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spec:
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containers:
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- name: fluentd-gcp
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resources:
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requests:
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- resource: cpu
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base: 101m
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- resource: memory
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base: 150Mi
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limits:
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- resource: memory
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base: 400Mi
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EOF
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```
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To remove the override and go back to GKE-provided defaults, it is enough to
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just remove the ScalingPolicy:
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```
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$ kubectl delete -n kube-system scalingpolicies.scalingpolicy.kope.io/fluentd-gcp-scaling-policy
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```
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[cpu]: https://kubernetes.io/docs/tasks/configure-pod-container/assign-cpu-resource/
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[memory]: https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource/
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[scalingPolicy]: https://github.com/justinsb/scaler
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[]()
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