117 lines
3.5 KiB
Go
117 lines
3.5 KiB
Go
// Copyright 2016 DigitalOcean
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
// Command ceph_exporter provides a Prometheus exporter for a Ceph cluster.
|
|
package main
|
|
|
|
import (
|
|
"flag"
|
|
"log"
|
|
"net/http"
|
|
"sync"
|
|
|
|
"github.com/digitalocean/ceph_exporter/collectors"
|
|
|
|
"github.com/ceph/go-ceph/rados"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
// CephExporter wraps all the ceph collectors and provides a single global
|
|
// exporter to extracts metrics out of. It also ensures that the collection
|
|
// is done in a thread-safe manner, the necessary requirement stated by
|
|
// prometheus. It also implements a prometheus.Collector interface in order
|
|
// to register it correctly.
|
|
type CephExporter struct {
|
|
mu sync.Mutex
|
|
collectors []prometheus.Collector
|
|
}
|
|
|
|
// Verify that the exporter implements the interface correctly.
|
|
var _ prometheus.Collector = &CephExporter{}
|
|
|
|
// NewCephExporter creates an instance to CephExporter and returns a reference
|
|
// to it. We can choose to enable a collector to extract stats out of by adding
|
|
// it to the list of collectors.
|
|
func NewCephExporter(conn *rados.Conn) *CephExporter {
|
|
return &CephExporter{
|
|
collectors: []prometheus.Collector{
|
|
collectors.NewClusterUsageCollector(conn),
|
|
collectors.NewPoolUsageCollector(conn),
|
|
collectors.NewClusterHealthCollector(conn),
|
|
collectors.NewMonitorCollector(conn),
|
|
},
|
|
}
|
|
}
|
|
|
|
// Describe sends all the descriptors of the collectors included to
|
|
// the provided channel.
|
|
func (c *CephExporter) Describe(ch chan<- *prometheus.Desc) {
|
|
for _, cc := range c.collectors {
|
|
cc.Describe(ch)
|
|
}
|
|
}
|
|
|
|
// Collect sends the collected metrics from each of the collectors to
|
|
// prometheus. Collect could be called several times concurrently
|
|
// and thus its run is protected by a single mutex.
|
|
func (c *CephExporter) Collect(ch chan<- prometheus.Metric) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
for _, cc := range c.collectors {
|
|
cc.Collect(ch)
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
var (
|
|
addr = flag.String("telemetry.addr", ":9190", "host:port for ceph exporter")
|
|
metricsPath = flag.String("telemetry.path", "/metrics", "URL path for surfacing collected metrics")
|
|
|
|
cephConfig = flag.String("ceph.config", "", "path to ceph config file")
|
|
)
|
|
flag.Parse()
|
|
|
|
conn, err := rados.NewConn()
|
|
if err != nil {
|
|
log.Fatalf("cannot create new ceph connection: %s", err)
|
|
}
|
|
|
|
if *cephConfig != "" {
|
|
err = conn.ReadConfigFile(*cephConfig)
|
|
} else {
|
|
err = conn.ReadDefaultConfigFile()
|
|
}
|
|
if err != nil {
|
|
log.Fatalf("cannot read ceph config file: %s", err)
|
|
}
|
|
|
|
if err := conn.Connect(); err != nil {
|
|
log.Fatalf("cannot connect to ceph cluster: %s", err)
|
|
}
|
|
defer conn.Shutdown()
|
|
|
|
prometheus.MustRegister(NewCephExporter(conn))
|
|
|
|
http.Handle(*metricsPath, prometheus.Handler())
|
|
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
|
|
http.Redirect(w, r, *metricsPath, http.StatusMovedPermanently)
|
|
})
|
|
|
|
log.Printf("Starting ceph exporter on %q", *addr)
|
|
if err := http.ListenAndServe(*addr, nil); err != nil {
|
|
log.Fatalf("cannot start ceph exporter: %s", err)
|
|
}
|
|
}
|