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Log Sources

It is essential to identify the origin of the logs before choosing the right approach to installing and configuring the Fluent Bit agent. However, to provide convenient parsing and data labeling, IONOS accepts logs from the following four log sources: Kubernetes, Docker, Linux Systemd, and HTTP. The configuration of these log sources varies accordingly.
Note: Technically, you can send logs with Fluent Bit from any source if the following communication protocols are supported: TCP and HTTP. The only convenient parsing currently offered is using the specified log sources.


This method lets you collect and ship your Kubernetes application's logs. Fluent Bit offers a wide range of information on how to set it up on your Kubernetes cluster. However, we also recommend you try our Kubernetes configuration examples before configuring the log source.


If you have a set of applications on Docker, we recommend trying our Docker configuration examples. You can also find more information about Docker configuration on Fluent Bit's official website.

Linux Systemd

To set up Fluent Bit on a Linux system with systemd or journals, you must install an appropriate package for your Linux distribution. For more information about how to accomplish it, see Fluent Bit's official website. We also recommend you try our Linux systemd sample configuration.


You can also send logs through the HTTP REST endpoint. You can transfer logs that are in JSON format only via the HTTP REST endpoint.
The following is an example:
curl --location \
--request POST '' \
--header 'Content-Type: application/json' \
--header 'APIKEY: <KEY>' \
--data '{
"status": "Ready",
"ts": 1580306777.04728,
"pod": {
"name": "Example Name",
"namespace": "data"
"msg": "Pod status updated",
"level": "error",
"label_1": "test label"