volker.raschek/prometheus-fail2ban-exporter
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Merge branch '1-export-metrics-on-enabled-disabled-jails' into 'main'

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Resolve "Export metrics on enabled/disabled jails"

Closes #1

See merge request hectorjsmith/fail2ban-prometheus-exporter!18
This commit is contained in:
Hector 2021-04-07 18:00:26 +00:00
commit a9e41188f6
3 changed files with 30 additions and 0 deletions
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5
README.md
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@ -99,6 +99,7 @@ Access exported metrics at `/metrics` (on the provided port).
Exposed metrics: Exposed metrics:
* `up` - Returns 1 if the service is up * `up` - Returns 1 if the service is up
* `enabled_jails` - Returns 1 for each jail that is enabled, 0 if disabled.
* `bad_ips` (per jail) * `bad_ips` (per jail)
* A *bad IP* is defined as an IP that has been banned at least once in the past * A *bad IP* is defined as an IP that has been banned at least once in the past
* Bad IPs are counted per jail * Bad IPs are counted per jail
@ -120,4 +121,8 @@ fail2ban_banned_ips{jail="jail2"} 2
# HELP fail2ban_up Was the last fail2ban query successful. # HELP fail2ban_up Was the last fail2ban query successful.
# TYPE fail2ban_up gauge # TYPE fail2ban_up gauge
fail2ban_up 1 fail2ban_up 1
# HELP fail2ban_enabled_jails Enabled jails.
# TYPE fail2ban_enabled_jails gauge
fail2ban_enabled_jails{jail="jail1"} 1
fail2ban_enabled_jails{jail="jail2"} 1
``` ```

5
src/db/db.go
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@ -8,6 +8,7 @@ import (
const queryBadIpsPerJail = "SELECT j.name, (SELECT COUNT(1) FROM bips b WHERE j.name = b.jail) FROM jails j" const queryBadIpsPerJail = "SELECT j.name, (SELECT COUNT(1) FROM bips b WHERE j.name = b.jail) FROM jails j"
const queryBannedIpsPerJail = "SELECT j.name, (SELECT COUNT(1) FROM bans b WHERE j.name = b.jail) FROM jails j" const queryBannedIpsPerJail = "SELECT j.name, (SELECT COUNT(1) FROM bans b WHERE j.name = b.jail) FROM jails j"
const queryJailNameToEnabled = "SELECT j.name, j.enabled FROM jails j"
type Fail2BanDB struct { type Fail2BanDB struct {
DatabasePath string DatabasePath string
@ -36,6 +37,10 @@ func (db *Fail2BanDB) CountBadIpsPerJail() (map[string]int, error) {
return db.RunJailNameToCountQuery(queryBadIpsPerJail) return db.RunJailNameToCountQuery(queryBadIpsPerJail)
} }
func (db *Fail2BanDB) JailNameToEnabledValue() (map[string]int, error) {
return db.RunJailNameToCountQuery(queryJailNameToEnabled)
}
func (db *Fail2BanDB) RunJailNameToCountQuery(query string) (map[string]int, error) { func (db *Fail2BanDB) RunJailNameToCountQuery(query string) (map[string]int, error) {
stmt, err := db.sqliteDB.Prepare(query) stmt, err := db.sqliteDB.Prepare(query)
defer db.mustCloseStatement(stmt) defer db.mustCloseStatement(stmt)

20
src/exporter.go
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@ -34,6 +34,11 @@ var (
"Number of bad IPs stored in the database (per jail).", "Number of bad IPs stored in the database (per jail).",
[]string{"jail"}, nil, []string{"jail"}, nil,
) )
metricEnabledJails = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "enabled_jails"),
"Enabled jails.",
[]string{"jail"}, nil,
)
) )
type Exporter struct { type Exporter struct {
@ -44,6 +49,7 @@ func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- metricUp ch <- metricUp
ch <- metricBadIpsPerJail ch <- metricBadIpsPerJail
ch <- metricBannedIpsPerJail ch <- metricBannedIpsPerJail
ch <- metricEnabledJails
} }
func (e *Exporter) Collect(ch chan<- prometheus.Metric) { func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
@ -52,6 +58,7 @@ func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
) )
e.collectBadIpsPerJailMetrics(ch) e.collectBadIpsPerJailMetrics(ch)
e.collectBannedIpsPerJailMetrics(ch) e.collectBannedIpsPerJailMetrics(ch)
e.collectEnabledJailMetrics(ch)
} }
func (e *Exporter) collectBadIpsPerJailMetrics(ch chan<- prometheus.Metric) { func (e *Exporter) collectBadIpsPerJailMetrics(ch chan<- prometheus.Metric) {
@ -80,6 +87,19 @@ func (e *Exporter) collectBannedIpsPerJailMetrics(ch chan<- prometheus.Metric) {
} }
} }
func (e *Exporter) collectEnabledJailMetrics(ch chan<- prometheus.Metric) {
jailNameToEnabledMap, err := e.db.JailNameToEnabledValue()
if err != nil {
log.Print(err)
}
for jailName, count := range jailNameToEnabledMap {
ch <- prometheus.MustNewConstMetric(
metricEnabledJails, prometheus.GaugeValue, float64(count), jailName,
)
}
}
func printAppVersion() { func printAppVersion() {
fmt.Println(version) fmt.Println(version)
fmt.Printf(" build date: %s\r\n commit hash: %s\r\n built by: %s\r\n", date, commit, builtBy) fmt.Printf(" build date: %s\r\n commit hash: %s\r\n built by: %s\r\n", date, commit, builtBy)