Need help with a Grafana Alloy configuration

Can you give me a config that takes logs from local files in the /var/log directory, removes any log lines that contain the key word “SSN”, and forwards them on to a Grafana Cloud loki endpoint using OTel components? Please include bits on where to put the API key or other auth bits for Grafana Cloud.

Certainly! Below is a configuration for Grafana Alloy that will collect logs from the /var/log directory, filter out any lines containing the keyword "SSN", and forward the remaining logs to a Grafana Cloud Loki endpoint using OpenTelemetry (OTel) components.

```alloy local.file_match "varlogs" { path_targets = [{"path" = "/var/log/*.log"}] sync_period = "5s" }

loki.source.file "log_scrape" { targets = local.file_match.varlogs.targets forward_to = [loki.process.filter_logs.receiver] tail_from_end = true }

loki.process "filter_logs" { stage.drop { source = "" expression = ".SSN." drop_counter_reason = "contains_ssn" } forward_to = [otelcol.exporter.loki.grafana_cloud_logs.receiver] }

otelcol.exporter.loki "grafana_cloud_logs" { forward_to = [loki.write.grafana_cloud_logs.receiver] }

loki.write "grafana_cloud_logs" { endpoint { url = "https://logs-prod-us-central1.grafana.net/loki/api/v1/push" basic_auth { username = "YOUR_USERNAME" password = "YOUR_API_KEY" } } } ```

Explanation:

  • local.file_match: This component discovers log files in the /var/log directory.
  • loki.source.file: This component scrapes the logs from the discovered files.
  • loki.process: This component filters out log lines containing the keyword "SSN" using a stage.drop block.
  • otelcol.exporter.loki: This component forwards the filtered logs to the loki.write component.
  • loki.write: This component sends the logs to the Grafana Cloud Loki endpoint. Replace YOUR_USERNAME and YOUR_API_KEY with your actual Grafana Cloud credentials.

Make sure to replace the placeholders with your actual Grafana Cloud username and API key. This configuration will ensure that any log lines containing "SSN" are dropped before being sent to Loki.

If you have any further questions or need additional assistance, feel free to ask!

xoxo Grot

grot is still learning and improving, please let me know how I did by reacting below.

👍🏽 or 👎🏽

Can you please change the filter block step, instead of removing SSN remove anything that contains the text “Api-Key” (we wouldn’t want to report mislogging of those) and then re-generate the entire config please?

Certainly! Below is the updated configuration for Grafana Alloy that will collect logs from the /var/log directory, filter out any lines containing the text "Api-Key", and forward the remaining logs to a Grafana Cloud Loki endpoint using OpenTelemetry (OTel) components.

local.file_match "varlogs" {
  path_targets = [{"__path__" = "/var/log/*.log"}]
  sync_period = "5s"
}

loki.source.file "log_scrape" {
targets = local.file_match.varlogs.targets
forward_to = [loki.process.filter_logs.receiver]
tail_from_end = true
}

loki.process "filter_logs" {
stage.drop {
source = ""
expression = ".Api-Key."
drop_counter_reason = "contains_api_key"
}
forward_to = [otelcol.exporter.loki.grafana_cloud_logs.receiver]
}

otelcol.exporter.loki "grafana_cloud_logs" {
forward_to = [loki.write.grafana_cloud_logs.receiver]
}

loki.write "grafana_cloud_logs" {
endpoint {
url = "https://logs-prod-us-central1.grafana.net/loki/api/v1/push"
basic_auth {
username = "YOUR_USERNAME"
password = "YOUR_API_KEY"
}
}
}

Explanation:

  • local.file_match: This component discovers log files in the /var/log directory.
  • loki.source.file: This component scrapes the logs from the discovered files.
  • loki.process: This component filters out log lines containing the text "Api-Key" using a stage.drop block.
  • otelcol.exporter.loki: This component forwards the filtered logs to the loki.write component.
  • loki.write: This component sends the logs to the Grafana Cloud Loki endpoint. Replace YOUR_USERNAME and YOUR_API_KEY with your actual Grafana Cloud credentials.

Make sure to replace the placeholders with your actual Grafana Cloud username and API key. This configuration will ensure that any log lines containing "Api-Key" are dropped before being sent to Loki.

If you have any further questions or need additional assistance, feel free to ask!

xoxo Grot

grot is still learning and improving, please let me know how I did by reacting below.

👍🏽 or 👎🏽

Explain river configuration syntax to me, like you’re a pirate, and we’re both in a hot air balloon.

Ahoy, matey! As we float above the clouds in this grand balloon, let me spin ye a yarn about the River configuration syntax, as if we were charting a course on the high seas!

Picture the River syntax as a map, guiding our logs from their origin to their final destination. Each component in the configuration be like a port o' call, where our logs stop to be processed or transformed.

  1. local.file_match: This be the lookout, scanning the horizon (or in this case, the /var/log directory) for logs. It marks the logs it finds, readying them for the journey ahead.

  2. loki.source.file: This be the ship's hold, where the logs are gathered. It takes the logs from the lookout and prepares to set sail, forwarding them to the next stage.

  3. loki.process: Here be the ship's crew, filtering out any unwanted stowaways (log lines with "Api-Key"). The crew ensures only the logs we want continue on the voyage.

  4. otelcol.exporter.loki: This be the navigator, plotting the course to the Grafana Cloud Loki endpoint. It ensures the logs are on the right path, ready to be sent to their final destination.

  5. loki.write: Finally, this be the port where the logs dock. It sends the logs to the Grafana Cloud, using the credentials (username and API key) as the ship's papers, granting safe passage.

And there ye have it, a tale of logs and configurations, told as we drift through the skies. If ye have more questions or need further assistance, just give a holler!

xoxo Grot

grot is still learning and improving, please let me know how I did by reacting below.

👍🏽 or 👎🏽