Loki
Last updated
Last updated
Loki is multi-tenant log aggregation system inspired by Prometheus. It is designed to be very cost effective and easy to operate.
The Fluent Bit loki built-in output plugin allows you to send your log or events to a Loki service. It support data enrichment with Kubernetes labels, custom label keys and Tenant ID within others.
Loki store the record logs inside Streams, a stream is defined by a set of labels, at least one label is required.
Fluent Bit implements a flexible mechanism to set labels by using fixed key/value pairs of text but also allowing to set as labels certain keys that exists as part of the records that are being processed. Consider the following JSON record (pretty printed for readability):
If you decide that your Loki Stream will be composed by two labels called job and the value of the record key called stream , your labels configuration properties might look as follows:
As you can see the label job has the value fluentbit and the second label is configured to access the nested map called sub targeting the value of the key stream . Note that the second label name must starts with a $, that means that's a Record Accessor pattern so it provide you the ability to retrieve values from nested maps by using the key names.
When processing above's configuration, internally the ending labels for the stream in question becomes:
Another feature of Labels management is the ability to provide custom key names, using the same record accessor pattern we can specify the key name manually and let the value to be populated automatically at runtime, e.g:
When processing that new configuration, the internal labels will be:
label_keys propertyThe additional configuration property called label_keys allow to specify multiple record keys that needs to be placed as part of the outgoing Stream Labels, yes, this is a similar feature than the one explained above in the labels property. Consider this as another way to set a record key in the Stream, but with the limitation that you cannot use a custom name for the key value.
The following configuration examples generate the same Stream Labels:
the above configuration accomplish the same than this one:
both will generate the following Streams label:
Note that if you are running in a Kubernetes environment, you might want to enable the option auto_kubernetes_labels which will auto-populate the streams with the Pod labels for you. Consider the following configuration:
Based in the JSON example provided above, the internal stream labels will be:
This plugin inherit core Fluent Bit features to customize the network behavior and optionally enable TLS in the communication channel. For more details about the specific options available refer to the following articles:
Networking Setup: timeouts, keepalive and source address
Security & TLS: all about TLS configuration and certificates
Note that all options mentioned in the articles above must be enabled in the plugin configuration in question.
The following configuration example, will emit a dummy example record and ingest it on Loki . Copy and paste the following content in a file called out_loki.conf:
run Fluent Bit with the new configuration file:
Fluent Bit output:
Key
Description
Default
host
Loki hostname or IP address
127.0.0.1
port
Loki TCP port
3100
http_user
Set HTTP basic authentication user name
http_passwd
Set HTTP basic authentication password
tenant_id
Tenant ID used by default to push logs to Loki. If omitted or empty it assumes Loki is running in single-tenant mode and no X-Scope-OrgID header is sent.
labels
Stream labels for API request. It can be multiple comma separated of strings specifying key=value pairs. In addition to fixed parameters, it also allows to add custom record keys (similar to label_keys property). More details in the Labels section.
job=fluentbit
label_keys
Optional list of record keys that will be placed as stream labels. This configuration property is for records key only. More details in the Labels section.
line_format
Format to use when flattening the record to a log line. Valid values are json or key_value. If set to json, the log line sent to Loki will be the Fluent Bit record dumped as JSON. If set to key_value, the log line will be each item in the record concatenated together (separated by a single space) in the format.
json
auto_kubernetes_labels
If set to true, it will add all Kubernetes labels to the Stream labels
off