Fluent Bit - Azure Log Analytics

Setup Fluent Bit and Azure Log Analytics

This is an end-to-end walkthrough of setting up Fluent Bit for log forwarding from a Kubernetes cluster to Azure Log Analytics

The sample application generates JSON logs. Normal logs are written to stdout. Error logs are written to stderr.

{"date":"2020-12-28T21:19:06.1347849Z","statusCode":200,"path":"/log/app","duration":78,"value":"HWIkixicjA"}
{"date":"2020-12-28T21:19:06.1846021Z","statusCode":400,"path":"/log/app","duration":9,"message":"Invalid paramater: cMwyFA"}
{"date":"2020-12-28T21:19:06.1444807Z","statusCode":500,"path":"/log/app","duration":266,"message":"Server error 9750"}

Prerequisites

Knowledge of Azure, Kubernetes, Fluent Bit and kubectl
Bash shell (tested on GitHub Codespaces, Mac, Ubuntu, WSL2)
Azure CLI (download)
Kubernetes cluster
kubectl with access to the Kubernetes cluster

Clone this repo

git clone https://github.com/Microsoft/fluent-bit-azure-log-analytics
cd fluent-bit-azure-log-analytics/fluentbit

Create Kubernetes Dependencies

For safety, we use the log-test namespace

Most deployments use the logging namespace by convention

# create namespace, service account, cluster role, cluster role binding
kubectl apply -f account.yaml

Create Azure Log Analytics Workspace

Select Azure Subscription

# login to Azure (if necessary)
az login

# get list of subscriptions
az account list -o table

# select subscription (if necesary)
az account set -s YourSubscriptionName

Create Log Analytics Workspace

# add az cli extension
#   this extension is in preview
az extension add --name log-analytics

# set environment variables (edit if desired)
export LogAppLoc=westus2
export LogAppRG=LogAppRG

# this value must be unique
export LogAppName=LogAppLogs

# create resource group
az group create -n $LogAppRG -l $LogAppLoc

# create Log Analytics Workspace
# check for workspace name is not unique error
#    export LogAppName with a different name and try again
az monitor log-analytics workspace create -g $LogAppRG -n $LogAppName -l $LogAppLoc

# delete secrets (if exist)
#    you can safely ignore a not found error
kubectl delete secret fluentbit-secrets -n log-test

# add Log Analytics secrets
kubectl create secret generic fluentbit-secrets -n log-test \
  --from-literal=WorkspaceId=$(az monitor log-analytics workspace show -g $LogAppRG -n $LogAppName --query customerId -o tsv) \
  --from-literal=SharedKey=$(az monitor log-analytics workspace get-shared-keys -g $LogAppRG -n $LogAppName --query primarySharedKey -o tsv)

# verify the secrets are set properly (base 64 encoded)
kubectl get secret fluentbit-secrets -n log-test -o jsonpath='{.data}'

Deploy to Kubernetes

Update Config (if required)

The config works with containerd or cri-o runtimes

config.yaml must be changed to work with dockerd or dockershim

More details here

Check the Kubernetes runtime

kubectl describe node | grep "Container Runtime Version:"

If the result shows dockerd or dockershim edit config.yaml

Replace
- config.yaml
  - input-kubernetes.conf
    - Parser cri
with
- Parser docker

# apply the fluentbit config
kubectl apply -f config.yaml

# start fluentbit daemonset
kubectl apply -f fluentbit-daemonset.yaml

# check daemonset until fluent-bit is running
kubectl get daemonset -n log-test

# check fluent-bit logs
kubectl logs -l k8s-app=fluent-bit-logging -n log-test

# run log app - this will generate 5 log entries
kubectl apply -f logapp.yaml

# check logapp pod
# logapp will run and then exit with Completed state
kubectl get pods

# check logs
kubectl logs logapp

# check fluent-bit logs
kubectl logs -l k8s-app=fluent-bit-logging -n log-test

# looking for a line like:
#   [2021/02/02 21:54:19] [ info] [output:azure:azure.0]

# check Log Analytics for your data on the Azure portal
# this can take 10-15 minutes initially

# generate more logs
kubectl delete -f logapp.yaml
kubectl apply -f logapp.yaml

# check Log Analytics for your data
# this should only take a few seconds

# delete logapp
kubectl delete -f logapp.yaml

# check daemonset
kubectl get daemonset -n log-test

# Result - fluent-bit daemonset is still running

Cleaning up

kubectl delete secret fluentbit-secrets -n log-test
kubectl delete -f fluentbit-daemonset.yaml
kubectl delete -f config.yaml
kubectl delete -f account.yaml

# verify everything is deleted
#    Error from server (NotFound)
kubectl get ns log-test

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct.

For more information see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.

Trademarks

This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow Microsoft's Trademark & Brand Guidelines.

Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party's policies.

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