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What the metrics show—and what they do not
Fail2Ban reads logs for authentication failures and can ban corresponding IP addresses using firewall rules. Its client can report status for the whole service and individual jails. Prometheus metrics make selected status and activity values available to Grafana, where you can track patterns over time.
A dashboard can show current and cumulative failures and bans for each jail, the number of jails, exporter health or errors, and selected jail configuration values. It cannot by itself tell you who successfully accessed a server, whether an alert is malicious, or what happened across other logs and services. Use it as an operational view alongside log review and your other security monitoring.
Fail2Ban’s fail2ban-client manual describes the client as the supported interface for controlling and configuring Fail2Ban. It states that Fail2Ban reads log files containing password-failure reports and bans corresponding IP addresses using firewall rules; the cited manual identifies its version as v1.1.2.dev1, a development build.
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Choose how to export Fail2Ban data
| Approach | How it works | Best fit | Trade-offs |
|---|---|---|---|
| Dedicated exporter | Reads the Fail2Ban socket and serves Prometheus metrics over HTTP. | You want a distinct, straightforward Prometheus scrape target. | You must run and secure another service or container, grant it access to the socket, and restrict access to its metrics endpoint. |
| Node Exporter textfile collector | A script reads Fail2Ban status and writes metric data to a file that Node Exporter collects. | Node Exporter is already deployed on the Fail2Ban host. | You must manage the script schedule, file ownership, and valid Prometheus exposition format. Values reflect script snapshots rather than a continuously served Fail2Ban endpoint. |
Dedicated exporter: a separate scrape target
The hctrdev Fail2Ban exporter documents reading /var/run/fail2ban/fail2ban.sock, listening on port 9191, and exposing metrics at /metrics. Prometheus must be able to reach that endpoint. This is an externally maintained project, not an exporter that Prometheus lists as officially supported; check its releases, platform support, configuration, and required permissions for your environment before deploying it.
If you use its documented Docker approach, the project mounts the parent Fail2Ban runtime directory read-only. It warns that mounting only the socket file can fail when Fail2Ban recreates that file. Read-only mounting limits write access, but it does not remove the need to protect the endpoint and the host’s runtime directory.
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Textfile collector: reuse Node Exporter
The bluecasttech Fail2Ban Prometheus script documents generating metrics for Node Exporter’s textfile collector. This avoids a separate HTTP exporter endpoint, but it makes the file-generation process part of monitoring reliability: the script needs appropriate permissions, must write valid metric data, and needs a schedule that keeps values fresh enough for your use.
Check Fail2Ban before connecting Prometheus
First confirm that Fail2Ban is active and learn the jail names on this host. Run these commands on the server with the appropriate local privileges:
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fail2ban-client status
fail2ban-client status <jail>The first command reports overall service status and active jails; replace <jail> with an actual jail name from that output to inspect its status. If there are no active jails or the expected jail is absent, resolve the Fail2Ban configuration or service issue before troubleshooting Grafana.
Set up a dedicated exporter and scrape it
The exact installation steps depend on your Linux distribution, Fail2Ban deployment, and exporter release. Do not assume a package name or copy a container command without checking the project’s current instructions, supported platform, configuration, and socket permissions.
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- Run the exporter where it can read the socket. Configure it for the Fail2Ban socket path in your environment. For the documented hctrdev setup, that path is
/var/run/fail2ban/fail2ban.sock. - Restrict access to the metrics endpoint. Allow only Prometheus or the monitoring network to reach port
9191. Do not expose the endpoint broadly just because it serves metrics rather than a web interface. - Check the endpoint from the Prometheus host. Confirm that the configured host and port are reachable and that requesting
/metricsreturns Prometheus-formatted output. If it does not, check the exporter process, socket access, host firewall, and network route. - Add the exporter as a Prometheus scrape target. Add the host and port to your Prometheus scrape configuration, using the configuration style appropriate to your deployment. Prometheus’s Node Exporter guide illustrates the scrape-target workflow for exporter endpoints.
- Verify the target before building panels. In Prometheus, check the target’s health and query the endpoint’s metric series. A failed scrape points to reachability or exporter issues; an up target with no Fail2Ban series points instead to socket access, exporter behavior, or metric-name differences.
Use the textfile collector instead
If Node Exporter is already installed, configure its textfile collector directory and arrange for the Fail2Ban script to write a .prom file there. Follow the script and Node Exporter instructions for the exact directory and options; those vary by installation. Ensure the file can be read by Node Exporter and that the script writes a complete, correctly formatted file rather than leaving partial output for a scrape.
Choose a schedule that suits how quickly you need updates, and monitor whether the generated file is being refreshed. With this method, the timestamp and values represent the script’s last successful snapshot. If the script stops running, stale values may remain on disk, so a visible metric is not necessarily proof that the latest collection succeeded.
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Build Grafana panels from the deployed metric names
The hctrdev exporter documents these example series: f2b_up, f2b_errors, f2b_jail_count, and per-jail values including f2b_jail_banned_current, f2b_jail_banned_total, f2b_jail_failed_current, and f2b_jail_failed_total. It also reports jail configuration values for ban time, find time, and maximum retries, plus a version metric for the exporter or Fail2Ban. Metric names can differ between forks and releases, so inspect your own /metrics response before writing PromQL.
- Current bans: graph or display
f2b_jail_banned_currentgrouped by the jail label present in your exporter output. - Cumulative bans: display
f2b_jail_banned_totalby jail. Treat it as a counter: it represents total events rather than the number currently banned. - Failures: use
f2b_jail_failed_currentfor the current value andf2b_jail_failed_totalfor the cumulative value, if those series and labels exist in your version. - Exporter and service status: add a panel for
f2b_upand, where useful,f2b_errors; first confirm the meaning and values in the exporter’s output. - Jail overview: use
f2b_jail_countas a high-level check that the expected set of jails is represented.
The hctrdev project says its sample Grafana dashboard is compatible with Grafana 9.1.8 and above. That is the project’s stated compatibility floor, not a guarantee for every later Grafana deployment or dashboard revision. Check the dashboard and your Grafana version, then compare imported panel queries with the series actually exposed by your exporter.
Troubleshoot missing or misleading data
- Prometheus target is down: check that the exporter is running, the configured address and port are correct, and Prometheus can reach port
9191through host and network firewalls. - Target is up but Fail2Ban metrics are missing: check the exporter’s access to the socket and whether its configured socket path matches the host. Inspect its output and logs before changing Grafana queries.
- Queries return no series: compare the query’s metric names and label keys with the deployed
/metricsoutput. Do not assume that a query for one fork works unchanged with another. - Panels look stale with the textfile method: check the script schedule, last file-update time, file permissions, and whether the collector sees a complete, valid file.
- Counts do not match expectations: confirm which jail is being shown and whether the panel is displaying current values or cumulative totals. These are different measures.
Validate the dashboard safely
Once collection is working, check that the expected jails and metrics appear and that Grafana can query them. If you choose to generate controlled test activity, do so only on a system and with accounts you are authorized to test; avoid triggering bans that could lock out legitimate users or disrupt production access. Treat the result as a check of your own monitoring path, not as a security test of the server as a whole.
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