Hi I am trying to monitor postgres SQL with Prometheus. For this purpose I am using this exporter https://github.com/wrouesnel/postgres_exporter
I am starting the exporter in my docker-compose.yml like this:
exporter-postgres:
image: wrouesnel/postgres_exporter
ports:
- 9113:9113
environment:
- DATA_SOURCE_NAME="postgresql://user:pass@localhost:5432/?sslmode=disable"
When the exporter is trying to access the database errors like this are thrown:
Error running query on database: pg_stat_database pg: Could not detect default username. Please provide one explicitly. file="postgres-exporter.go" line=490
and
Error scanning runtime variable: pg_stat_database pg: Could not detect default username. Please provide one explicitly. file="postgres-exporter.go" line=464
I am not really sure what this message could mean. Also I am not really sure if the issues originates in my docker-compose file, or the exporter.
The lines which throw the error in the postgres-exporter.go are:
// Use SHOW to get the value
row := db.QueryRow(fmt.Sprintf("SHOW %s;", columnName))
var val interface{}
err := row.Scan(&val)
if err != nil {
log.Errorln("Error scanning runtime variable:", columnName, err)
continue
}
and
query, er := queryOverrides[namespace]
if er == false {
query = fmt.Sprintf("SELECT * FROM %s;", namespace)
}
// Don't fail on a bad scrape of one metric
rows, err := db.Query(query)
if err != nil {
log.Println("Error running query on database: ", namespace, err)
e.error.Set(1)
return
}
https://github.com/wrouesnel/postgres_exporter/blob/master/postgres_exporter.go
I am thankful for any help!
Edit:
Here is the connection to the database:
db, err := sql.Open("postgres", e.dsn)
Whereas e.dsn is generated like this:
dsn := os.Getenv("DATA_SOURCE_NAME")
The connection doesn't throw any error
