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Minhaz
Minhaz

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Setting up fluent bit using docker

#devops #docker #fluentbit #deployment

Purpose

This is a step by step guide about how to setup fluent bit with docker.

The fluent bit official installation guide only had documentation about how to run fluent bit using docker but it didn't mention how to set it up.

So this is my solution to how to setup fluent bit using docker commands only. No docker compose.

Steps

Designate a folder where you'll store the fluent bit configs. In my case the directory is D:/fluent-bit

Start a temporary container to copy default configs from 

docker run -d --rm --name temp cr.fluentbit.io/fluent/fluent-bit
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Copy the configs to your designated folder 

docker cp temp:/fluent-bit/etc/ D:/fluent-bit
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Stop the temporary container 

docker stop temp
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Now start fluent bit with the config folder mounted as a volume 

docker run -dti --name fluent-bit -v D:/fluent-bit:/fluent-bit/etc cr.fluentbit.io/fluent/fluent-bit
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By default fluent bit is configured to output to std out. So see docker log to see what fluent bit is logging. 

docker logs fluent-bit
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You'll see something like this
docker logs output

Now to make sure that fluent bit is indeed taking configs from our folder. Go to the designated folder and open the fluent-bit.conf folder

Look for this string 

tag cpu.local
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Change it to this 

tag CPU_LOCAL
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Save the file and restart the container 

docker restart fluent-bit
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Now look at docker logs 

docker logs fluent-bit
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Notice that the logs are different.
Config change worked

References

  1. https://github.com/minhaz1217/devops-notes/tree/master/65.%20setting%20up%20fluent%20bit%20with%20docker
  2. https://docs.fluentbit.io/manual/installation/docker

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